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ORIGINAL ARTICLE  EXERCISE PHYSIOLOGY AND BIOMECHANICS 

The Journal of Sports Medicine and Physical Fitness 2018 January-February;58(1-2):17-26

DOI: 10.23736/S0022-4707.16.06825-0

Copyright © 2016 EDIZIONI MINERVA MEDICA

lingua: Inglese

Differing six minute pacing strategies affect anaerobic contribution, oxygen uptake, muscle deoxygenation and cycle performance

John MURRAY 1, Michael McCRUDDEN 1, Juan M. MURIAS 2, Volker NOLTE 1, Glen R. BELFRY 1

1 Faculty of Health Sciences, School of Kinesiology, University of Western Ontario, London, ON, Canada; 2 Faculty of Kinesiology, University of Calgary, School of Kinesiology, London, ON, Canada


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BACKGROUND: This study compared an all-out start (AO) to a constant power start strategy (CON) during a 6 min cycle performance on utilization of W´ (energy above critical power [CP]), muscle deoxygenation (HHb), oxygen uptake (VO2) and performance in recreationally active individuals. The AO strategy was similar to that employed by rowers.
METHODS: Eight healthy males (age =24±3 y) completed a ramp test to fatigue (VO2peak =4.42±0.54 L∙min-1; peak power =385±35 W) and a 3-min all-out test to determine CP and the CON work rate. The AO strategy began with a 12 s sprint, followed by 258 s at 5%RESULTS: Total W´ utilized was higher during CON vs. AO (18,109±5439 J vs. 13,754±3543 J, P<0.05). The HHb/VO2 ratio reflected a duration mismatch between O2 provision to O2 utilization during CON compared to AO (118 s vs. 58 s, P<0.05). Mean work rate was higher in CON compared to AO (315±21 W vs. 302±64 W, P<0.05).
CONCLUSIONS: CON yielded a greater utilization of W´ and a higher mean work rate compared to AO during a traditional rowing stratagem during a 6-min cycle performance in recreationally active individuals.


KEY WORDS: Oxygen consumption - Exercise test - Sport

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