Physiological responses to maximal 4 s sprint interval cycling using inertial loading: the influence of inter-sprint recovery duration.

Autor: Vardarli E; Department of Kinesiology and Health Education, Human Performance Laboratory, University of Texas at Austin, One University Station, Austin, TX, 78712, USA., Satiroglu R; Department of Kinesiology and Health Education, Human Performance Laboratory, University of Texas at Austin, One University Station, Austin, TX, 78712, USA., Allen JR; Department of Kinesiology and Health Education, Human Performance Laboratory, University of Texas at Austin, One University Station, Austin, TX, 78712, USA., Bjellquist-Ledger R; Department of Kinesiology and Health Education, Human Performance Laboratory, University of Texas at Austin, One University Station, Austin, TX, 78712, USA., Burton HM; Department of Kinesiology and Health Education, Human Performance Laboratory, University of Texas at Austin, One University Station, Austin, TX, 78712, USA., Coyle EF; Department of Kinesiology and Health Education, Human Performance Laboratory, University of Texas at Austin, One University Station, Austin, TX, 78712, USA. coyle@austin.utexas.edu.
Jazyk: angličtina
Zdroj: European journal of applied physiology [Eur J Appl Physiol] 2021 Aug; Vol. 121 (8), pp. 2295-2304. Date of Electronic Publication: 2021 May 11.
DOI: 10.1007/s00421-021-04677-6
Abstrakt: Purpose: Interval exercise allows very high-power outputs to be maintained, a key for stimulating training adaptations. The main purpose of this study was to develop a sprint interval protocol that stimulated both anaerobic and aerobic systems while maximizing power output and minimizing fatigue. The secondary goal was to investigate the influence of inter-sprint recovery duration.
Methods: Sixteen (8 females) participants (age: 23.5 ± 3.4 years, peak oxygen consumption (VO 2peak ): 45.6 ± 9.2 ml kg -1  min -1 ) took part in this study. The exercise protocol involved 30 bouts of 4 s maximal cycling sprints using an 'Inertial Load Ergometer'. Recovery durations between sprints of 15, 30 and 45 s were studied in three trials.
Results: Peak power output (PPO) was maintained while taking 45 and 30 s of recovery, although it was 9% higher (p < 0.05) during 45 vs. 30 s. PPO with 15 s recovery declined 18% (p < 0.05) and then stabilized as did oxygen consumption (72±2% VO 2peak ) at a level that might reflect the peak rate of ATP-PC resynthesis from oxidative metabolism. The 15-, 30-, and 45 s trials elicited 72, 56, and 49% VO 2peak and 86, 80, and 75% of maximal heart rate (all p<0.001). Perceived exertion increased with shorter recovery periods but remained at 12.6-14.7 and never became 'very hard'.
Conclusion: The present study describes the use of an inertial-load ergometer to accommodate repeated 4 s maximal cycling sprints that elicit 72% VO 2peak when the recovery period is 15 s. However, a recovery duration of 15 s was insufficient for the maintenance of power generation.
Trial Registration Number and Date: NCT04448925, 26 Jun 2020; retrospectively registered to clinicaltrials.gov.
Databáze: MEDLINE
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