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ISOTONIC. HYDRATION DRINK

1 KG · 30 DAYS

Napój węglowodanowo-elektrolitowy w proszku z mieszanką 2:1 glukoza:fruktoza, paliwo i nawodnienie w jednej butelce na wysiłki dłuższe niż godzina.

Co to daje na treningu i starcie:

Paliwo i nawodnienie naraz: płyn, elektrolity i węglowodany w jednej porcji, w stężeniu, które nie zalega w żołądku, mniej planowania w trakcie wysiłku.
Mieszanka 2:1 glukoza:fruktoza: dwa źródła węglowodanów wchłaniane różnymi szlakami dostarczają więcej paliwa bez zalegania, kluczowe powyżej 60 g węglowodanów na godzinę.
Izotoniczność, około 280 mOsm/kg: stężenie zbliżone do płynów ustrojowych, napój opróżnia się z żołądka w tempie podobnym do wody i nie ciągnie wody do jelita.
Pełen profil elektrolitów z naciskiem na sód: 235 mg sodu na porcję w rekomendacji IOC, uzupełnione potasem, wapniem i magnezem.

Sprawdza się przy wysiłku dłuższym niż godzina, w upale i w blokach dwujednostkowych, mniej przy krótkich sesjach, gdzie wystarczy woda. 1 miarka (40 g) na 500 ml, trzy smaki o niemal identycznym profilu makro i bez sztucznych barwników, a opakowanie 1 kg to 25 porcji. Każda partia jest badana w niezależnym laboratorium.

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DELIVERY VIA INPOST OR DPD

Zamów w ciągu 4 h i 39 minut — wyślemy dziś o 16:00.

ATHLECOR® ISOTONIC TEST RESULTS

At ATHLECOR we are committed to transparency and safety. That is why every product batch is tested in independent external laboratories.

BATCH NUMBER

PRODUCTION DATE

REPORT

AC-3.5A-2602-01

05.03.2026

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AC-3.5B-2602-01

06.03.2026

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AC-3.5C-2602-01

06.03.2026

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OSMOLALNOŚĆ

06.03.2026

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Key benefits

Płyn, elektrolity i paliwo w jednej butelce
Zamiast osobno pilnować nawodnienia i żeli, dostajesz oba naraz, w stężeniu, które nie zalega w żołądku i nie pogarsza wchłaniania. Mniej planowania w trakcie wysiłku.
Mieszanka 2:1 glukoza:fruktoza
Dwa źródła węglowodanów wchłaniane różnymi szlakami pozwalają dostarczyć do mięśni więcej paliwa niż przy samej glukozie, bez zalegania w żołądku. Kluczowe, gdy celujesz powyżej 60 g węglowodanów na godzinę.
Osmolalność 280 mOsm/kg, czyli izotoniczność
Napój o stężeniu zbliżonym do płynów ustrojowych opróżnia się z żołądka w tempie podobnym do wody, a przy tym dostarcza węglowodany i elektrolity. Nie ciągnie wody do jelita ani z niego.
Pełen profil elektrolitów z naciskiem na sód
235 mg sodu (0,59 g soli) na porcję mieści się w rekomendacji IOC (0,5-0,7 g/litr), uzupełnione potasem, wapniem i magnezem. Sód tracisz z potem najwięcej i to on odpowiada za retencję płynu.
Forma proszku, pełna kontrola stężenia
40 g na 500 ml to napój izotoniczny (ok. 7%). Możesz rozcieńczyć (40 g na 750 ml, hipotonicznie, lekka hydratacja) lub zagęścić (60 g na 500 ml, ok. 10%, więcej paliwa na bardzo długie starty). Opakowanie 1 kg zajmuje mniej miejsca niż 25 gotowych butelek.
Czysty skład i badanie partii
Bez sztucznych barwników i konserwantów. Trzy smaki o niemal identycznym profilu makroskładników. Każda partia badana w niezależnym laboratorium, ważne przy kontroli antydopingowej.

Dosage

How to prepare one serving

Dissolve 1 scoop (40 g) in 500 ml of cold water. Shake in a shaker or sports bottle for 10 to 15 seconds. The drink prepared this way delivers 35 g of carbohydrates, a full electrolyte profile (sodium, potassium, calcium, magnesium) and a carbohydrate concentration of around 7%, which falls within the recommended 4 to 8% range that favours fluid absorption.

With a greater carbohydrate need, you can increase the concentration to 60 g per 500 ml. The concentration then rises to around 10%, so it's worth alternating with sips of plain water to keep the drink isotonic in the stomach.

How much to drink during exertion

The standard recommendation is 400 to 800 ml of fluid per hour, depending on temperature, intensity and your individual sweat rate. It's best to drink regularly, every 10 to 15 minutes in servings of 100 to 150 ml, instead of waiting for the feeling of thirst. Thirst is a late signal and appears only at a loss of around 1 to 2% of body weight.

How many carbohydrates you need per hour

Exertion of 1 to 2.5 hours: 30 to 60 g of carbohydrates per hour. That's one serving of Athlecor Isotonic (35 g) per hour, optionally supplemented with a gel or bar over longer distances.

Exertion of 2.5 to 3 hours: 60 to 90 g of carbohydrates per hour. Two servings of Athlecor Isotonic per hour, or one serving combined with an energy gel or bar.

Exertion over 3 hours (advanced, after gut training): 90 to 120 g of carbohydrates per hour. Two servings of Athlecor Isotonic per hour plus additional solid or gel fuel, depending on individual tolerance.

Above 60 g of carbohydrates per hour, a single source (glucose alone) hits the limit of the SGLT1 transporter in the gut. The 2:1 glucose:fructose blend in Athlecor Isotonic gets around this limit and lets you deliver larger doses without gut symptoms.

When to use it

During exertion. The main and basic application, especially when the session lasts longer than 60 minutes, takes place in high temperatures or is particularly intense.

30 to 60 minutes before the start. As support for hydration and a final fuel dose before exertion, especially when the last full meal was 3 to 4 hours earlier.

Between sessions in two-a-day training. Between a morning and an afternoon session, the isotonic supports hydration and starts the process of replenishing glycogen, so that the second session doesn't start with a completely empty tank and glycogen depletion comes more slowly in the training block.

Who is it for?

Dla biegaczy długodystansowych, kolarzy i triathlonistów
In endurance sports over 60 minutes, planned carbohydrate and electrolyte intake translates directly into the result. The Stellingwerff and Cox meta-analysis (2014, 61 studies) showed a significant improvement in capacity in 82% of the analysed trials, on average by 4.9% in efforts of 1 to 2 hours and 6.2% in efforts over 2 hours. In practice: 4.9% on a marathon finished in 3:30 is over 10 minutes of difference in the final time.
Dla osób trenujących w upale lub przy dużej potliwości
At temperatures above 25 to 30°C, fluid losses can reach 1 to 3 litres per hour (IOC 2023). With dehydration of 2% of body weight, endurance capacity drops clearly, cramps appear and the pace you can't hold up in the second half of the session. The isotonic, taken regularly during exertion, limits the scale of dehydration and lets you hold your training plan also in the summer months.
Dla zawodników sportów zespołowych i dyscyplin z dużą liczbą sprintów
Football, basketball, hockey, combat sports, tennis: repeated high-intensity efforts, a long total playing time in a tournament, often high temperature. The isotonic supports hydration and fuel in one bottle and lets you hold the pace of play in the fourth quarter just as in the first.
Dla osób startujących w zawodach powyżej godziny
Half marathon, marathon, middle and long triathlon formats, HYROX, gravel and ultra cycling. Long starts require carbohydrate and electrolyte strategies planned and practised beforehand in training (the "nothing new on race day" principle). Athlecor Isotonic delivers carbohydrates and electrolytes in a ratio that the gut accepts under load, so the training plan stays the competition plan.
Dla osób trenujących podwójne jednostki dziennie i w wysokoobjętościowych blokach
A single session can be short (45 to 60 min) and on its own not require carbohydrate replenishment. In a block of 8 to 12 sessions a week, often two a day, glycogen deficit builds up day to day. Every session in which you don't replenish fuel starts the next from a lower tank. The isotonic during longer sessions lets you enter the next day with no "heavy legs" effect resulting from shortfalls from the previous day.
Dla aktywnych rekreacyjnie przy dłuższych sesjach
A long cycling trip, a mountain hiking season, a full day of trekking in heat, an amateur's first marathon. Wherever you come back from a session with a headache, calf cramps or an evening feeling of total exhaustion, plain water is no longer enough. The isotonic delivers what you lost in sweat, before it shows on your wellbeing after training.

How does Athlecor Isotonic work?

What exactly the drink does in the body during exertion

During exertion you lose two things at once: fluids with electrolytes (through sweating and breathing) and muscle and liver glycogen, the main fuel of the working muscles. After crossing a certain threshold, usually 60 to 90 minutes of intense exertion, faster in heat, the effects begin: capacity drops, perceived fatigue rises, thermoregulation worsens, cramps or stomach discomfort may appear.

Water alone hydrates but doesn't deliver fuel. Gels and bars give fuel but require separate planning and aren't always convenient to match to hydration needs. The isotonic combines both functions in one bottle: in one serving you get fluid, electrolytes and carbohydrates in a ratio that doesn't build up in the stomach and doesn't worsen absorption.

Why osmolality 280 mOsm/kg matters

Osmolality is a measure of the concentration of dissolved particles in a fluid. The body's fluids, namely blood and lymph, have an osmolality of around 280 to 300 mOsm/kg. Drinks with the same osmolality are isotonic and have a key property: they don't draw water into or out of the intestine, that is they absorb efficiently without worsening hydration

Hypotonic drinks (below 270 mOsm/kg) hydrate better but deliver less energy.

Isotonic drinks (270 to 300 mOsm/kg) optimally balance hydration and energy delivery.

Hypertonic drinks (above 320 mOsm/kg) build up in the stomach and hold water in the intestine instead of letting it absorb into the blood. The effect is worse hydration and more frequent gut symptoms during exertion.

Athlecor Isotonic at the standard dilution (40 g per 500 ml) has an osmolality of around 280 mOsm/kg, that is exactly in the middle of the isotonic range.

What research shows on 2:1 blends in the context of sport

The 2:1 glucose:fructose blend works because it gets around the limit of a single transporter in the gut. In studies on cyclists comparing different carbohydrate setups, the 2:1 blend improved capacity by around 8% relative to glucose alone and 19.5% relative to water in prolonged exertion.

In the Stellingwerff and Cox meta-analysis (2014), covering 61 studies on carbohydrate intake during exertion, the mean improvement in results grows with the duration of the activity:

2.6% in efforts under 1 hour.

4.9% in efforts of 1 to 2 hours.

6.2% in efforts over 2 hours.

The longer the exertion lasts, the greater the significance of planned carbohydrate and electrolyte intake.

On electrolytes, the IOC in its 2018 and 2023 position statements recommends 0.5 to 0.7 g of sodium per litre of drink for efforts lasting over an hour, especially in high temperatures. For very long starts (over 3 hours) or in people prone to cramps, the range can be raised to 0.7 to 1.0 g/l.

Three practical conclusions worth knowing

The isotonic is a tool for exertion, not a drink for everyday drinking. The carbohydrates in it are designed as fuel for working muscles. Outside training they deliver calories that the body doesn't need at that moment for work, so they lose their function.

For short efforts (up to 45 to 60 minutes), plain water is usually enough. The isotonic has its greatest advantage above an hour of exertion, in heat, with heavy sweating, or in a training block in which sessions build up a glycogen deficit.

Gut training can't be skipped. If you're planning doses of 60 g of carbohydrates per hour or more for a race, test them beforehand in training with the same products, at the same concentration and the same time of day as the planned start. The standard rule: the last 6 to 8 weeks before the target start are the moment when the digestive system learns to tolerate the full dose. Race day isn't a good moment for the first experiments with the isotonic.

Additional benefits

Forma proszku, nie gotowego napoju
Powder gives full control over concentration and serving. As standard, 40 g per 500 ml is an isotonic drink with a carbohydrate concentration of around 7%. You can modify this serving depending on starting conditions and preference. Diluting to 40 g per 750 ml gives a hypotonic drink,which works as light hydration at low exercise intensity or as fluid replenishment before training. Concentrating to 60 g per 500 ml gives a hypertonic solution at around 10%, useful during very long starts (over 3 hours), when you need a larger carbohydrate dose per hour. In this variant it's worth sipping plain water to keep osmotic balance in the stomach.
Wygodne pakowanie pod start i obozowy plecak
1 scoop (40 g) per 500 ml of water, shake in a sports bottle or shaker. It dissolves well, leaves no lumps at the bottom. A 1 kg pack takes up less space in the start backpack than the equivalent 25 bottles of ready isotonic, so to a camp, a longer competition trip or a meet-up you take your whole supply in one pack.
Czysty skład
No colours, no preservatives. Athlecor Isotonic in the sports bottle has a clear, natural colour resulting from the composition.

Ingredients

FOREST FRUITS

Maltodextrin, fructose, potassium (potassium citrate), calcium (calcium salts of citric acid), glucose (dextrose), magnesium (magnesium salts of citric acid), flavouring, acidity regulator: citric acid, salt, sweetener: sucralose.

Nutritional value	per 100 g	per 40 g (1 scoop)	per 120 g (3 scoops)
Energy value	1441 kJ / 345 kcal	576 kJ / 138 kcal	1729 kJ / 414 kcal
Fat	0 g	0 g	0 g
of which saturates	0 g	0 g	0 g
Carbohydrates	86 g	35 g	103 g
of which sugars	38 g	15 g	45 g
Protein	0 g	0 g	0 g
Salt	1,5 g	0,59 g	1,8 g
Potassium	249 mg (12%*)	100 mg (5%*)	300 mg (15%*)
Calcium	134 mg (17%*)	53 mg (7%*)	160 mg (20%*)
Magnesium	50 mg (13%*)	20 mg (5%*)	60 mg (16%*)

Nutrient Reference Value

LEMONADE

Maltodextrin, fructose, potassium (potassium citrate), calcium (calcium salts of citric acid), glucose (dextrose), magnesium (magnesium salts of citric acid), acidity regulator: citric acid, flavouring, salt, sweetener: sucralose.

Nutritional value	per 100 g	per 40 g (1 scoop)	per 120 g (3 scoops)
Energy value	1415 kJ / 339 kcal	566 kJ / 135 kcal	1698 kJ / 406 kcal
Fat	0 g	0 g	0 g
of which saturates	0 g	0 g	0 g
Carbohydrates	85 g	34 g	102 g
of which sugars	36 g	15 g	44 g
Protein	0 g	0 g	0 g
Salt	1,5 g	0,59 g	1,8 g
Potassium	249 mg (12%*)	100 mg (5%*)	300 mg (15%*)
Calcium	134 mg (17%*)	53 mg (7%*)	160 mg (20%*)
Magnesium	50 mg (13%*)	20 mg (5%*)	60 mg (16%*)

Nutrient Reference Value

ORANGE
Maltodextrin, fructose, potassium (potassium citrate), calcium (calcium salts of citric acid), glucose (dextrose), magnesium (magnesium salts of citric acid), acidity regulator: citric acid, flavouring, salt, sweetener: sucralose.

Nutritional value	per 100 g	per 40 g (1 scoop)	per 120 g (3 scoops)
Energy value	1448 kJ / 346 kcal	579 kJ / 139 kcal	1738 kJ / 416 kcal
Fat	0 g	0 g	0 g
of which saturates	0 g	0 g	0 g
Carbohydrates	87 g	35 g	104 g
of which sugars	35 g	15 g	45 g
Protein	0 g	0 g	0 g
Salt	1,5 g	0,59 g	1,8 g
Potassium	249 mg (12%*)	100 mg (5%*)	300 mg (15%*)
Calcium	134 mg (17%*)	53 mg (7%*)	160 mg (20%*)
Magnesium	50 mg (13%*)	20 mg (5%*)	60 mg (16%*)

Nutrient Reference Value

SCIENTIFIC RESEARCH

Napoje węglowodanowo-elektrolitowe to jedna z najlepiej przebadanych kategorii w żywieniu sportowym, z czterema dekadami badań na zawodnikach wytrzymałościowych. Dlatego trzech filarów Athlecor Isotonic, czyli mieszanki 2:1 glukoza:fruktoza, osmolalności w zakresie izotonicznym i profilu elektrolitów zgodnego z rekomendacjami Międzynarodowego Komitetu Olimpijskiego, nie opisujemy hasłami, tylko wprost liczbami z badań. Poniżej sześć kluczowych publikacji: dwa stanowiska Międzynarodowego Komitetu Olimpijskiego (o suplementach i o wysiłku w upale), przegląd o indywidualizacji podaży węglowodanów, najszersza metaanaliza węglowodanów i wyniku sportowego, przegląd o napojach funkcjonalnych oraz metaanaliza o wpływie osmolalności na nawodnienie. Przy każdej pozycji znajdziesz najpierw to, co wynika z niej dla Twojej strategii na treningu i starcie, a pod rozwinięciem pełną wersję naukową ze wszystkimi liczbami.

¹Międzynarodowy Komitet Olimpijski opisuje napój sportowy dokładnie tak, jak zbudowaliśmy nasz.

Maughan 2018, International Journal of Sport Nutrition and Exercise Metabolism. IOC Consensus Statement: Dietary Supplements and the High-Performance Athlete.

Stanowisko MKOl opisuje napoje sportowe jako produkty dostarczające jednocześnie płyn i węglowodany w trakcie wysiłku, a po wysiłku wspierające nawodnienie i uzupełnianie energii. Jako typowy skład podaje 5-8% węglowodanów, 10-35 mmol/l sodu i 3-5 mmol/l potasu. Athlecor Isotonic w standardowym rozcieńczeniu (około 7% węglowodanów) mieści się w tym zakresie.

Source: Maughan, Ronald J et al. “IOC Consensus Statement: Dietary Supplements and the High-Performance Athlete.” International journal of sport nutrition and exercise metabolism vol. 28,2 (2018): 104-125. doi:10.1123/ijsnem.2018-0020

²W upale liczy się sód i węglowodany w butelce, a 0,5-0,7 g sodu na litr to rekomendacja, w którą celuje nasza porcja.

Racinais 2023, British Journal of Sports Medicine. IOC consensus statement on recommendations and regulations for sport events in the heat.

Stanowisko MKOl o wysiłku w upale wskazuje, że przy wysiłku dłuższym niż godzina warto pić roztwór z 0,5-0,7 g sodu na litr, a u osób ze skłonnością do skurczów nawet więcej. Napój z około 20-40 g węglowodanów na litr może poprawiać wydolność w wysiłku ponad godzinę w temperaturze około 30 stopni. Celem nie jest pełne wyrównanie strat potu, tylko ograniczenie odwodnienia, dlatego liczy się powtarzalny, dobrze tolerowany napój.

Key conclusions

The document indicated that during training and competition in high temperatures one should avoid hypohydration exceeding 2% of body weight, and in daily monitoring of hydration, changes in body weight kept within a range below 1 to 2%, a urine specific gravity below 1.020 and a plasma osmolality below 280 mmol/kg can be helpful.
The authors report that the rate of fluid loss during exertion is highly variable and can range from around 1 l/h to over 3 l/h, while the real fluid intake in endurance athletes tends to be clearly lower. The document cites that in elite marathon runners fluid intake was estimated at around 0.5 to 0.7 l/h, and in elite race walkers over a distance of 20 km at around 1.1 l/h.
The publication also noted that the capacity for fluid absorption during exertion is limited. The authors indicate that gastric emptying during exertion in high temperatures is around 1 l/h, so a hydration strategy during competition shouldn't assume full compensation of sweat losses, but their limitation without increasing body weight during exertion.
In the section on electrolytes, it was given that during exertion lasting longer than 1 hour, athletes should include in their hydration plan a solution containing 0.5 to 0.7 g of sodium per litre. In people prone to muscle cramps in conditions of high temperature, sodium supplementation can be raised to 1.5 g/l or around 1.5 g/h.
The authors indicate that during exertion lasting longer than 1 hour in hot conditions, it can be favourable to use a drink containing diluted carbohydrates and electrolytes. The document gives that a drink containing around 20 to 40 g of carbohydrates per litre can improve capacity during exertion lasting over an hour at a temperature of around 30°C.
In the same part of the document it was also indicated that carbohydrate supplementation during exertion lasting over 1 hour can amount to 30 to 60 g per hour, and for events lasting over 2.5 hours even up to 90 g per hour. For drinks used in hot conditions, the authors also indicate a concentration below 6% carbohydrates and 0.4 to 0.85 g of sodium per litre as a solution that can improve the drink's acceptance and support its intake.
In the section devoted to recovery after exertion, it was given that after exertion in high temperatures rehydration should usually amount to around 100 to 120% of the lost body weight, and in a situation of rapid fluid restoration the literature also cites a value of 150% of body weight loss in the first hour after finishing exertion.

Source: Racinais, Sebastien et al. “IOC consensus statement on recommendations and regulations for sport events in the heat.” British journal of sports medicine vol. 57,1 (2023): 8-25. doi:10.1136/bjsports-2022-105942

³Mieszanka glukozy i fruktozy podnosi tempo wykorzystania węglowodanów nawet o 75% wobec samej glukozy.

Jeukendrup 2014, Sports Medicine. A step towards personalized sports nutrition: carbohydrate intake during exercise.

Pojedyncze źródło węglowodanów utlenia się maksymalnie około 60 g na godzinę, bo korzysta z jednego transportera w jelicie. Dodanie fruktozy, wchłanianej innym szlakiem, pozwala podnieść to tempo do około 1,26 g na minutę, nawet o 75% wyżej. W jednym z przywołanych badań napój glukozowo-fruktozowy poprawiał moc o około 8% wobec samej glukozy. To wprost uzasadnia naszą proporcję 2:1.

Key conclusions

The author indicates that with exertion lasting around 30 to 75 minutes, capacity benefits may come from even small amounts of carbohydrates or rinsing the mouth with a carbohydrate solution. korzyści wydolnościowe mogą dawać już małe ilości węglowodanów lub płukanie jamy ustnej roztworem węglowodanów.
For exertion lasting 1 to 2 hours, the recommendation presented was around 30 g of carbohydrates per hour, for exertion of 2 to 3 hours around 60 g/h, and for exertion lasting over 2.5 hours around 90 g/h. 1–2 godziny przedstawiono rekomendację podaży około 30 g węglowodanów na godzinę, dla wysiłku 2–3 godziny około 60 g/h, a dla wysiłku trwającego powyżej 2,5 godziny około 90 g/h.
The work gave that a single carbohydrate source can be oxidised at a rate of around 60 g/h, while with a higher intake the use of 60 g/h, natomiast przy wyższej podaży konieczne jest zastosowanie multi-transportable carbohydratesis necessary to allow a higher oxidation rate and limit carbohydrate build-up in the gut.
The author cited studies in which simultaneous intake of glucose and fructose let the oxidation rate of exogenous carbohydrates rise to around 1,26 g/minthat is above the earlier intake limit of 1 g/min, and even up to 1 g/min, a także nawet do 75% higher than in the case of carbohydrates using only the SGLT1 transporter.
In a cited study during around 2 hours of cycling, followed by a time trial lasting around 60 minutes, a glucose drink increased power by 9% relative to placebo (254 vs 231 W), while a drink containing glucose and fructose improved it by a further 8% relative to glucose alone (275 vs 254 W). 2 godzin jazdy na rowerze, po której następowała próba czasowa trwająca około 60 minut, napój glukozowy zwiększał moc o 9% względem placebo (254 vs 231 W), natomiast napój zawierający glukozę i fruktozę poprawiał ją o kolejne 8% względem samej glukozy (275 vs 254 W).
In a large multi-centre study involving 51 cyclists and triathletes, comparing intakes of 10 to 120 g of carbohydrates per hour, the greatest improvement in capacity was observed at an intake of around 60 to 80 g/h. 51 kolarzy i triathlonistów, porównującym podaż 10–120 g węglowodanów na godzinę, największą poprawę wydolności obserwowano przy spożyciu około 60–80 g/h.
The author emphasises that carbohydrate intake recommendations during exertion are independent of body weight,and their practical implementation can be carried out using drinks, gels or solid products low in fat, protein and fibre..
The work also noted that it's worth training the carbohydrate intake strategy in practice, because it can reduce the risk of gastrointestinal symptoms and increase the gut's capacity to absorb carbohydrates.

Source: Jeukendrup, Asker. “A step towards personalized sports nutrition: carbohydrate intake during exercise.” Sports medicine (Auckland, N.Z.) vol. 44 Suppl 1,Suppl 1 (2014): S25-33. doi:10.1007/s40279-014-0148-z

⁴Im dłuższy wysiłek, tym większy zysk z węglowodanów: średnio do 6,2% w wysiłkach ponad 2 godziny.

Stellingwerff i Cox 2014, Applied Physiology, Nutrition, and Metabolism. Systematic review: Carbohydrate supplementation on exercise performance or capacity of varying durations.

Przegląd 61 badań i 679 zawodników pokazał istotną poprawę wyniku w 82% prób, rosnącą z czasem wysiłku: około 2,6% poniżej godziny, 4,9% w wysiłkach 1-2 godziny i 6,2% powyżej 2 godzin. Przy wyższych podażach mieszanka glukozy i fruktozy podnosiła utylizację węglowodanów o 20-50% wobec samej glukozy. W praktyce 4,9% w maratonie biegniętym w 3:30 to ponad 10 minut różnicy.

Key conclusions

Of the 61 included studies, 82% showed a statistically significant improvement in exercise results after carbohydrate intake, while 18% showed no difference relative to placebo. 82% wykazało istotną statystycznie poprawę wyników wysiłkowych po podaży węglowodanów, natomiast 18% nie wykazało różnic względem placebo.
The authors showed a significant relationship between the duration of exertion and the scale of result improvement after carbohydrate intake. As exertion duration grew, so did the size of the ergogenic effect (p=0,0036).
W wysiłkach trwających krócej niż 1 godzinę poprawę wyników odnotowano w 16 z 23 badań, a średnia poprawa wynosiła 2,6% ± 3,3%In efforts lasting under 1 hour, an improvement in results was recorded in 16 of 23 studies, and the mean improvement was 2.6% ± 3.3%. The authors indicate that in this time range, benefits may come from rinsing the mouth alone with a carbohydrate solution.
W cytowanym przez autorów klasycznym badaniu płukanie jamy ustnej 25 ml 6% roztworu węglowodanów przez około 10 sekund co 7,5 minuty poprawiało wynik około 1-godzinnej próby czasowej o około 3%In a classic mouth-rinse study cited by the authors, 25 ml of a 6% carbohydrate solution every 7.5 minutes improved the result of a 1-hour time trial by around 3%. The authors give that practically a sufficient exposure can be around 1.5 g of carbohydrates in 25 ml for 5 to 10 seconds every 8 to 10 minutes of exertion. 1,5 g węglowodanów w 25 ml przez 5–10 sekund co 8–10 minut wysiłku.
W wysiłkach trwających 1–2 godziny pozytywny efekt podaży węglowodanów odnotowano w 15 z 18 badań, a średnia poprawa wyników wynosiła 4,9% ± 4,9%In efforts lasting 1 to 2 hours, a positive effect of carbohydrate intake was recorded in 15 of 18 studies, and the mean improvement in results was 4.9% ± 4.9%. The authors indicate that in this time range of exertion, regular intake of around 30 to 60 g of carbohydrates per hour appears favourable 30–60 g węglowodanów na godzinę.
W wysiłkach trwających powyżej 2 godzin istotną poprawę wyników wykazano w 16 z 17 badań, a średnia poprawa wynosiła 6,2% ± 4,3%In efforts lasting over 2 hours, a significant improvement in results was shown in 16 of 17 studies, and the mean improvement was 6.2% ± 4.3%. The authors emphasise that as exertion lengthens, the significance of carbohydrate intake as an energy source for the working muscles grows.
The work indicated that during exertion lasting over 2 hours it can be particularly favourable to use higher carbohydrate intakes, reaching up to 90 g/h or more, on condition of using multi-transportable carbohydrate sources, such as a combination of glucose and fructose. do 90 g/h lub więcej, pod warunkiem zastosowania wielotransportowalnych źródeł węglowodanów, takich jak połączenie glukozy i fruktozy.
The authors cite data showing that at high carbohydrate intakes (>60 to 70 g/h) glucose and fructose blends can increase the oxidation rate of exogenous carbohydrates by around 20 to 50% compared with an isocaloric intake of glucose alone or maltodextrin.>60–70 g/h) mieszanki glukozy i fruktozy mogą zwiększać tempo utleniania egzogennych węglowodanów o około 20–50% w porównaniu z izokaloryczną podażą samej glukozy lub maltodekstryny.
In comparative studies, glucose and fructose blends improved capacity in prolonged exertion by around 8% relative to glucose alone and by around 19.5% relative to water 8% względem samej glukozy oraz o około 19,5% względem wody.
W dużym, wieloośrodkowym badaniu z udziałem 51 wytrenowanych kolarzy i triathlonistów In a large, multi-centre study involving 51 trained cyclists and triathletes, the greatest improvement in results was observed at an intake of 78 g of carbohydrates per hour, with the range giving the best results estimated at 68 to 88 g/h. Even at an intake of 10 g/h, an improvement in results of around 1.0% was recorded. 78 g węglowodanów na godzinę, a zakres dający najlepsze rezultaty oszacowano na 68–88 g/h. Nawet przy podaży 10 g/h odnotowano poprawę wyników o około 1,0%.
Autorzy podkreślają również, że zalecenia dotyczące podaży węglowodanów podczas wysiłku nie wymagają przeliczania na masę ciałaThe authors also emphasise that carbohydrate intake recommendations during exertion don't require calculation against body weight, and practical doses should be matched above all to the duration of exertion and the individual tolerance of the digestive tract.

Source: Stellingwerff, Trent, and Gregory R Cox. “Systematic review: Carbohydrate supplementation on exercise performance or capacity of varying durations.” Applied physiology, nutrition, and metabolism = Physiologie appliquee, nutrition et metabolisme vol. 39,9 (2014): 998-1011. doi:10.1139/apnm-2014-0027

⁵Przegląd potwierdza podstawową rolę napoju sportowego: nawodnienie, elektrolity i węglowodany pod wysiłek.

Orrù 2018, Nutrients. Role of Functional Beverages on Sport Performance and Recovery.

Przegląd napojów funkcjonalnych w sporcie podsumowuje, że napoje sportowe mają przede wszystkim wspierać nawodnienie, uzupełnianie elektrolitów i dostarczanie węglowodanów wykorzystywanych podczas wysiłku. Autorzy zbierają też dane o wpływie odwodnienia na wydolność oraz o znaczeniu rodzaju węglowodanów. To szeroka rama, w którą wpisuje się nasza formuła.

Key conclusions

The authors indicate that during exertion, dehydration leading to a drop in body weight of 1 to 3% is a common phenomenon, while dehydration at the level of 2 to 7% of body weight can worsen endurance capacity, especially in time-trial-type cycling tests.
The work gave that in a temperate climate, moderate dehydration at the level of 1 to 2% of body weight usually doesn't influence capacity in efforts lasting around 90 minutes, but with dehydration exceeding 2% of body weight and exertion lasting longer than 90 minutes it can already worsen performance. In a hot environment (31 to 32°C), a worsening of capacity may appear already at dehydration corresponding to 2% of body weight.
The authors cite the ACSM position, according to which for exertion lasting under 3 hours an isotonic drink containing 0.5 to 0.7 g of sodium per litre is recommended, while for exertion lasting longer than 3 hours a more concentrated solution containing 0.7 to 1.0 g of sodium per litre is recommended.
In the section devoted to carbohydrate drinks, it was indicated that even an intake of around 20 g of carbohydrates per hour can bring exercise benefits. The authors cite studies in which an intake of 22 g/h improved results, while 11 g/h gave no effect, and an intake of 16 g/h of glucose improved endurance by around 14%.
The work also noted that the oxidation rate of exogenous carbohydrates with intake of a single source doesn't exceed around 60 g/h, which is why current ACSM recommendations indicate an intake of 30 to 60 g of carbohydrates per hour during exertion.
The authors cite a review by Temesi et al., in which an intake of 30 to 80 g of carbohydrates per hour in the form of 6 to 8% carbohydrate-electrolyte drinks improved capacity indicators by around 2.0% in time-to-exhaustion tests, 15.1% in time trials, 7.5% in submaximal protocols ending with a time-to-exhaustion test, and 54.2% in submaximal protocols ending with a time trial relative to placebo.
In the section on the type of carbohydrates, it was given that with intake of glucose alone the oxidation rate of exogenous carbohydrates reaches around 1.2 g/min, while the combination of glucose with fructose or sucrose can increase it to around 1.7 g/min. The authors indicate that this results from the use of different gut transporters and may favour greater availability of both carbohydrates and fluids during long exertion.
In the summary, the authors state that sports drinks containing carbohydrates and electrolytes, especially glucose, fructose and sodium, may support capacity by maintaining metabolism and optimising water absorption, while there's no equally strong evidence of a direct improvement in performance from adding other functional ingredients.

Source: Orrù, Stefania et al. “Role of Functional Beverages on Sport Performance and Recovery.” Nutrients vol. 10,10 1470. 10 Oct. 2018, doi:10.3390/nu10101470

⁶Osmolalność napoju wpływa na nawodnienie, dlatego stawiamy na zakres izotoniczny.

Rowlands 2022, Sports Medicine. The Hydrating Effects of Hypertonic, Isotonic and Hypotonic Sports Drinks and Waters on Central Hydration During Continuous Exercise: A Systematic Meta-Analysis and Perspective.

Metaanaliza 28 badań oceniła wpływ napojów hipotonicznych, izotonicznych, hipertonicznych i wody na centralny status nawodnienia w czasie ciągłego wysiłku, mierzony zmianą objętości osocza. To bezpośrednie porównanie różnych osmolalności pokazuje, dlaczego stężenie napoju ma znaczenie praktyczne. Athlecor Isotonic w standardowym rozcieńczeniu ma osmolalność około 280 mOsm/kg, w środku zakresu izotonicznego.

Source: Rowlands, David S et al. “The Hydrating Effects of Hypertonic, Isotonic and Hypotonic Sports Drinks and Waters on Central Hydration During Continuous Exercise: A Systematic Meta-Analysis and Perspective.” Sports medicine (Auckland, N.Z.) vol. 52,2 (2022): 349-375. doi:10.1007/s40279-021-01558-y

WHAT TO KNOW ABOUT ISOTONIC. ISOTONIC DRINK

Find answers to key questions about this product.

How is an isotonic drink different from water?

Water hydrates, but it does not provide the carbohydrates or electrolytes you lose through sweat. For short efforts up to roughly 45-60 minutes, water alone is usually enough. Beyond an hour, in the heat or during intense exercise, an isotonic drink has the edge: a single serving delivers fluid, sodium, potassium, calcium, magnesium and carbohydrates at a rate your gut can actually absorb. This helps you maintain performance, limit the degree of dehydration and delay the point at which glycogen runs out in the working muscles.

How is an isotonic drink different from an energy drink?

These are two different product categories, even though both contain sugar. An isotonic drink is designed for use during exercise: it has a carbohydrate concentration of 4-8% (close to the osmolality of blood), an electrolyte profile matched to sweat losses, and contains no caffeine or other stimulants. An energy drink is meant to provide stimulation during everyday activity (work, study, driving): it contains a lot of sugar and caffeine, is hypertonic (meaning it sits in the stomach during exercise) and does not have an optimal electrolyte profile. Drinking an energy drink while running or cycling usually ends in stomach discomfort, not improved performance.

Do I need an isotonic drink for every training session?

No. For efforts up to roughly 45 minutes, water is usually enough, possibly with a small amount of carbohydrates. Isotonic drinks make the most sense when a training session or start lasts longer than 60 minutes, is intense, takes place in the heat, or when you have two sessions planned in a day and you do not want to deplete your muscle glycogen stores.

Which flavour should I choose?

The carbohydrate and electrolyte profile per serving is practically identical across all three variants. Choosing a flavour is purely a matter of preference: Orange is a classic citrus flavour with moderate tartness, works well in the heat and is the most neutral of the three. Lemonade is distinctly tart and drier, suiting people who do not like very sweet drinks during training. Forest Fruits is the fruitiest and sweetest of the three. Bear in mind that your flavour preference under advanced fatigue is often different from everyday, so in the long run it is worth testing all three flavours in training before your target start.

Does Athlecor Isotonic contain caffeine?

No. The formula contains no caffeine or other stimulants, so you can use it both for morning sessions and in the evening, without affecting sleep. If you plan to use caffeine before a start or during exercise, source it separately (capsules, gel, coffee) to suit your individual tolerance. Separating the two lets you control your caffeine dose independently of your carbohydrate and electrolyte dose, which is more practical for most endurance athletes.

How many carbohydrates do I need per hour of exercise?

In short: 30-60 g/h for sessions lasting 1 to 2.5 hours, 60-90 g/h for sessions of 2.5 to 3 hours, and up to 90-120 g/h for advanced athletes who have completed gut training. One serving of Athlecor Isotonic provides 35 g of carbohydrates. You will find full guidelines, along with a specific way to hit each of these ranges, in the "Dosage" section above.

How much fluid should I drink during training?

In short: 400-800 ml per hour, in portions of 100-150 ml every 10-15 minutes, depending on temperature, intensity and individual sweat rate. Thirst is a late signal and only appears once you have lost roughly 1-2% of body mass, so it is not worth waiting for it before drinking. You will find full guidance in the "Dosage" section above.

How do I combine an isotonic drink with gels or bars?

First set your target carbohydrate intake per hour, then split it between the drink, gels and bars. For example: if your target is 60 g/h, you can drink 500 ml of a 6% carbohydrate drink (30 g) and add one gel with 25-30 g of carbohydrates. When you need more fluid than carbohydrates, lower the concentration of the drink and provide most of your energy through gels or bars.

Isn't the sugar in an isotonic drink unhealthy?

During exercise, the carbohydrates from an isotonic drink are first and foremost fuel for the working muscles, not "empty calories". Glucose is absorbed from the gut independently of insulin, and during exercise the muscles have an increased capacity to take up glucose (GLUT4 transporters are "pulled" to the cell membrane even without insulin). The problem with sugar arises mainly when sweet drinks are consumed frequently outside training and create a calorie surplus, not when they are used deliberately as an energy source during exercise.

What is gut training and is it really necessary?

Gut training means gradually increasing the amount of carbohydrates and fluids during your sessions so that your digestive tract gets used to larger doses. It is especially important when you plan more than 60 g of carbohydrates per hour or a start in a long event. This reduces the risk of gastrointestinal issues on start day.

Can isotonic drinks cause stomach problems?

In some people, portions that are too large at once, a high carbohydrate concentration or a lack of habituation can cause discomfort. What usually helps: drinking in small sips, avoiding very sweet drinks in the heat, gradually increasing the amount during training, and alternating between the isotonic drink and plain water when fluid needs are very high.

Do isotonic drinks damage your teeth?

Like any drink containing sugar or with a lower pH, isotonic drinks can contribute to tooth decay and enamel erosion, especially if they are sipped frequently throughout the day and outside exercise. In practice it is worth limiting their consumption mainly to training and starts, drinking them in larger mouthfuls rather than small sips spread throughout the day, and rinsing your mouth with water once a session is finished. It can also help to have a meal or drink with a more neutral pH and containing calcium (e.g. milk, yoghurt) shortly after exercise.

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ISOTONIC. HYDRATION DRINK

ATHLECOR® ISOTONIC TEST RESULTS

What research shows on 2:1 blends in the context of sport

SCIENTIFIC RESEARCH

1Międzynarodowy Komitet Olimpijski opisuje napój sportowy dokładnie tak, jak zbudowaliśmy nasz.

2W upale liczy się sód i węglowodany w butelce, a 0,5-0,7 g sodu na litr to rekomendacja, w którą celuje nasza porcja.

3Mieszanka glukozy i fruktozy podnosi tempo wykorzystania węglowodanów nawet o 75% wobec samej glukozy.

4Im dłuższy wysiłek, tym większy zysk z węglowodanów: średnio do 6,2% w wysiłkach ponad 2 godziny.

5Przegląd potwierdza podstawową rolę napoju sportowego: nawodnienie, elektrolity i węglowodany pod wysiłek.

6Osmolalność napoju wpływa na nawodnienie, dlatego stawiamy na zakres izotoniczny.

WHAT TO KNOW ABOUT ISOTONIC. ISOTONIC DRINK

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¹Międzynarodowy Komitet Olimpijski opisuje napój sportowy dokładnie tak, jak zbudowaliśmy nasz.

²W upale liczy się sód i węglowodany w butelce, a 0,5-0,7 g sodu na litr to rekomendacja, w którą celuje nasza porcja.

³Mieszanka glukozy i fruktozy podnosi tempo wykorzystania węglowodanów nawet o 75% wobec samej glukozy.

⁴Im dłuższy wysiłek, tym większy zysk z węglowodanów: średnio do 6,2% w wysiłkach ponad 2 godziny.

⁵Przegląd potwierdza podstawową rolę napoju sportowego: nawodnienie, elektrolity i węglowodany pod wysiłek.

⁶Osmolalność napoju wpływa na nawodnienie, dlatego stawiamy na zakres izotoniczny.

PRZESUWAJ GRANICE
Z NAUKOWĄ PRECYZJĄ