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Effect of Carbohydrate Ingestion During Prolonged Exercise on Durability of the Moderate-to-Heavy Intensity Transition and Severe-Intensity Performance

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Date

2024

Authors

Dudley-Rode, Harrison

Supervisor

Maunder, Ed
Zinn, Caryn

Item type

Thesis

Degree name

Master of Sport, Exercise and Health

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Publisher

Auckland University of Technology

Abstract

Purpose: ‘Durability’ refers to resilience to the effect of prolonged exercise on physiological profiling variables, such as power output at the moderate-to-heavy intensity transition. The effect of carbohydrate ingestion on durability of the moderate-to-heavy intensity transition has not been studied. Therefore, the purpose of this investigation was 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 well-trained cyclists and triathletes (10 males, 2 females; V̇Oշpeak, 59 ± 5 mL kg ̄ ¹ min ̄ ¹; training volume, 14 ± 5 h week ̄ ¹) underwent a characterisation trial and three experimental trials. Participants performed an incremental test and 5-min time-trial (TT) without prior exercise (PRE), and after 150-min of moderate-intensity cycling, with (POSTϲнο) and without (POSTϲοɴ) carbohydrate ingestion. Results: Power output at the moderate-to-heavy intensity transition was lower in POSTϲнο (225 ± 36 W, ∆ -7 ± 3 W, ∆ -3 ± 2%, P = 0.0265) and POSTϲοɴ (216 ± 35 W, ∆ -13 ± 9 W, ∆ -6 ± 4%, P = 0.0011) than PRE (229 ± 37 W), and lower in POSTϲοɴ than POSTϲнο (∆ -7 ± 9 W, ∆ -3 ± 4%, P = 0.0186). The prolonged exercise-induced reduction in metabolic power was greater in POSTϲοɴ than POSTϲнο (P = 0.0101). Mean power output in the 5-min TT was lower in POSTϲнο (351 ± 53 W, ∆ -15 ± 12 W, ∆ -4 ± 3%, P = 0.0251) and POSTϲοɴ (328 ± 63 W, ∆ -35 ± 38 W, ∆ -10 ± 10%, P = 0.0272) than PRE (363 ± 55 W), but POSTϲнο and POSTϲοɴ were not significantly different (∆ 25 ± 37 W, ∆ 9 ± 13%, P = 0.1859). Conclusion: These data suggest that durability of the moderate-to-heavy intensity transition is improved with carbohydrate ingestion. Athletes are therefore able to maintain higher power outputs in relation to their intensity domain transitions during prolonged exercise when ingesting carbohydrate. Additional research is necessary to further understand the underlying mechanisms.

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http://hdl.handle.net/10292/18014

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Masters Theses