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The effect of 30-second sprints during prolonged exercise on gross efficiency, electromyography, and pedaling technique in elite cyclists

Almquist, Nicki Winfield, Ettema, Gertjan, Hopker, James G., Sandbakk, Oyvind, Ronnestad, Bent R. (2019) The effect of 30-second sprints during prolonged exercise on gross efficiency, electromyography, and pedaling technique in elite cyclists. International Journal of Sports Physiology and Performance, 15 (4). pp. 562-570. ISSN 1555-0265. (doi:10.1123/ijspp.2019-0367) (KAR id:78570)

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https://doi.org/10.1123/ijspp.2019-0367

Abstract

Background: Cycling competitions are often of long duration and include repeated high-intensity efforts. Purpose: To investigate the effect of repeated maximal sprints during 4 hours of low-intensity cycling on gross efficiency (GE), electromyography patterns, and pedaling technique compared with work-matched low-intensity cycling in elite cyclists. Methods: Twelve elite, male cyclists performed 4 hours of cycling at 50% of maximal oxygen uptake either with 3 sets of 3 × 30-second maximal sprints (E&S) during the first 3 hours or a work-matched cycling without sprints (E) in a randomized order. Oxygen uptake, electromyography, and pedaling technique were recorded throughout the exercises. Results: GE was reduced from start to the end of exercise in both conditions (E&S: 19.0 [0.2] vs 18.1 [0.2], E: 19.1% [0.2%] vs 18.1% [0.2%], both P = .001), with no difference in change between conditions (condition × time interaction, P = .8). Integrated electromyography increased from start to end of exercise in m. vastus lateralis and m. vastus medialis (m. vastus medialis: 9.9 [2.4], m. vastus lateralis: 8.5 [4.0] mV, main effect of time: P < .001 and P = .03, respectively) and E&S increased less than E in m. vastus medialis (mean difference −3.3 [1.5] mV, main effect of condition: P = .03, interaction, P = .06). The mechanical effectiveness only decreased in E&S (E&S: −2.2 [0.7], effect size = 0.24 vs E: −1.3 [0.8] percentage points: P = .04 and P = .8, respectively). The mean power output during each set of 3 × 30-second sprints in E&S did not differ (P = .6). Conclusions: GE decreases as a function of time during 4 hours of low-intensity cycling. However, the inclusion of maximal repeated sprinting does not affect the GE changes, and the ability to sprint is maintained throughout the entire session.

Item Type: Article
DOI/Identification number: 10.1123/ijspp.2019-0367
Uncontrolled keywords: endurance cycling; repeated sprinting; cycling; economy; sprint-ability
Subjects: R Medicine > RC Internal medicine > RC1235 Physiology of sports
Divisions: Divisions > Division of Natural Sciences > School of Sport and Exercise Sciences
Depositing User: James Hopker
Date Deposited: 11 Nov 2019 20:11 UTC
Last Modified: 16 Feb 2021 14:09 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/78570 (The current URI for this page, for reference purposes)
Hopker, James G.: https://orcid.org/0000-0002-4786-7037
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