Shorter sprints elicit greater cardiorespiratory and mechanical responses with less fatigue during time-matched sprint interval training (SIT) sessions

Benitez-Flores, Stefano, de Sousa, Arilson F.M., da Cunha Toto, Erick Carlos, Rosa, Thiago Santos, Del Rosso, Sebastian, Foster, Carl, and Boullosa, Daniel (2018) Shorter sprints elicit greater cardiorespiratory and mechanical responses with less fatigue during time-matched sprint interval training (SIT) sessions. Kinesiology, 50 (2). pp. 137-148.

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The aim of this study was to compare the physiological, mechanical and perceptual responses to two sprint interval training (SIT) sessions with very short vs. long sprints, and to verify if those differences could be reflected in measures of acute fatigue. Eleven physically active men performed, after the maximum oxygen consumption (VO(2)max) determination, SIT5s (16x5s with 24s of recovery) and SIT20s (4x20s with 120s of recovery) in random order on a cycle ergometer. Physiological, mechanical, and perceptual responses were evaluated during and after the sessions. The countermovement jump (CMJ) height and autonomic control of heart rate (HR) were evaluated before and after the sessions. Diet was also controlled through recall questionnaires. During the training, SIT5s exhibited greater HR, VO2, power output, and total work (TW) (p<.05). In contrast, respiratory exchange ratio (RER), rate of fatigue (RF), and blood lactate (BLa) % accumulation were greater in SIT20s (p<.05). The OMNI-cycle Scale Rating of Perceived Exertion (OMNI-cycle scale) and Feeling Scale (FS) scores were similar during both protocols (p>.05). A faster HR recovery (HRR) and a higher CMJ height were observed after the SIT5s (p<.05). However, HR variability (HRV) was similarly depressed after both protocols (p>.05). Some correlations between the mechanical and physiological responses were revealed only in the SIT5s. SIT5s was demonstrated to be more efficient as exhibited by greater mechanical responses associated with a higher aerobic activity, when compared to the volume-matched SIT protocol of longer sprints. Simple monitoring tools such as HRR and CMJ could help practitioners to detect differences in acute fatigue after different SIT sessions.

Item ID: 57173
Item Type: Article (Research - C1)
ISSN: 1848-638X
Keywords: high intensity interval training, mechanical responses, physiological responses, perceptual responses, acute fatigue
Copyright Information: This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
Funders: Agencia Nacional de Investigación e Innovación, Uruguay (ANII), PROSUP/CAPES, PNBD-CAPES, CNPq, Brazil
Date Deposited: 20 Feb 2019 07:46
FoR Codes: 42 HEALTH SCIENCES > 4207 Sports science and exercise > 420702 Exercise physiology @ 100%
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