Altering Work to Rest Ratios Differentially Influences Fatigue Indices During Repeated Sprint Ability Testing

• Autores: Michael B. Lamonica, David H. Fukuda, Kyle S. Beyer, Mattan W. Hoffman, Amelia Miramonti, Joshua J. Riffe, Kayla M. Baker, Maren S. Fragala, Jay R. Hoffman
• Localización: Journal of strength and conditioning research: the research journal of the NSCA, ISSN 1064-8011, Vol. 30, Nº. 2, 2016, págs. 400-406
• Idioma: inglés
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• Resumen

  • This study examined the influence of recovery time on fatigue indices, performance (total work [TW], peak power [PP], and mean power [MP]), and oxygen consumption during repeated sprint ability (RSA) on a cycle ergometer. Eight recreationally-trained men performed 3 RSA protocols consisting of 10 × 6 s sprints with 12 s, 18 s, and 24 s rest intervals between each sprint. Fatigue indices were determined as percent decrement (%Dec) and rate of decline using either a log transform method or standard slope approach for TW, PP, and MP during respective RSA protocols. The maximal V[Combining Dot Above]O2 value in response to given sprint intervals and the minimal V[Combining Dot Above]O2 value in response to given rest periods (V[Combining Dot Above]O2work and V[Combining Dot Above]O2rest, respectively) were recorded. A repeated measures analysis of variance was used to analyze all variables. Average V[Combining Dot Above]O2work was not different among rest interval trials. Average V[Combining Dot Above]O2rest with 12 s rest was greater than 18 s and 24 s (2.16 ± 0.17 L·min-1, 1.91 ± 0.18 L·min-1, 1.72 ± 0.15 L·min-1, respectively), while 18 s was greater than 24 s. Average TW and MP were greater with 24 s rest than 12 s (4,604.44 ± 915.98 J vs. 4,305.46 ± 727.17 J, respectively), with no differences between RSA protocols for PP. No differences in %Dec were observed. Both methods of calculating rates of decline per sprint for PP and TW were greater during 12 s than 18 s or 24 s. Since changes were only noted between the 12 s and 24 s protocols, a 6 s differential in rest intervals may not be enough to elicit alterations in TW, PP, MP, or %Dec in RSA performance. Rate of decline may be a more sensitive measure of fatigue than %Dec.