Carbohydrate Ingestion During Prolonged Exercise Blunts the Reduction in Power Output at the Moderate-to-Heavy Intensity Transition
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Authors
Dudley-Rode, H
Zinn, C
Plews, DJ
Charoensap, T
Maunder, E
Supervisor
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Journal Article
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Springer Science and Business Media LLC
Abstract
Purpose: To determine the effect of carbohydrate ingestion during prolonged exercise on durability of the moderate-to-heavy-intensity transition and severe-intensity performance. Methods: Twelve trained cyclists and triathletes (10 males, 2 females; V˙O2peak, 59 ± 5 mL kg−1 min−1; training volume, 14 ± 5 h week−1) performed an incremental test and 5-min time trial (TT) without prior exercise (PRE), and after 150 min of moderate-intensity cycling, with (POSTCHO) and without (POSTCON) carbohydrate ingestion. Results: Power output at the first ventilatory threshold (VT1) was lower in POSTCHO (225 ± 36 W, ∆ -3 ± 2%, P = 0.027, n = 11) and POSTCON (216 ± 35 W, ∆ -6 ± 4%, P = 0.001, n = 12) than PRE (229 ± 37 W, n = 12), and lower in POSTCON than POSTCHO (∆ -7 ± 9 W, ∆ -3 ± 4%, P = 0.019). Mean power output in the 5-min TT was lower in POSTCHO (351 ± 53 W, ∆ -4 ± 3%, P = 0.025) and POSTCON (328 ± 63 W, ∆ -10 ± 10%, P = 0.027) than PRE (363 ± 55 W), but POSTCHO and POSTCON were not significantly different (∆ 25 ± 37 W, ∆ 9 ± 13%, P = 0.186). Blood glucose concentration was maintained in POSTCHO, and was significantly lower at the 120 and 150-min timepoint in POSTCON (P < 0.05). Conclusion: These data suggest that durability of the moderate-to-heavy-intensity transition is improved with carbohydrate ingestion. This has implications for training programming and load monitoring.Description
Keywords
Carbohydrate, Durability, Exercise, Nutrition, 42 Health Sciences, 4207 Sports Science and Exercise, 1106 Human Movement and Sports Sciences, Sport Sciences, 3202 Clinical sciences, 3208 Medical physiology, 4207 Sports science and exercise
Source
European Journal of Applied Physiology, ISSN: 1439-6319 (Print); 1439-6327 (Online), Springer Science and Business Media LLC, 125(5), 1349-1359. doi: 10.1007/s00421-024-05687-w
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