Reliability of Anaerobic Contributions during a Single Exhaustive Knee-extensor Exercise.

Autor:	Luches-Pereira, Gabriel, Kalva-Filho, Carlos Augusto, Bertucci, Danilo Rodrigues, de Carvalho, Carlos Dellavechia, Barbieri, Ricardo Augusto, Papoti, Marcelo
Předmět:	KNEE physiology EXERCISE physiology PEARSON correlation (Statistics) ANAEROBIC threshold SKELETAL muscle T-test (Statistics) STATISTICAL significance RESEARCH funding RESEARCH evaluation EXERCISE intensity ERGOMETRY DESCRIPTIVE statistics STRENGTH training RESEARCH methodology STATISTICAL reliability PHYSICAL fitness INTRACLASS correlation EXERCISE tests OXYGEN consumption BODY movement CONFIDENCE intervals LACTIC acid DATA analysis software
Zdroj:	International Journal of Sports Medicine; May2024, Vol. 45 Issue 5, p359-368, 10p
Abstrakt:	The total anaerobic contribution (AC[La-]+PCr) is a valid and reliable methodology. However, the active muscle mass plays an important role in the AC[La-]+PCr determination, which might influence its reliability. Thus, this study aimed to investigate the effects of two exhaustive intensities on the reliability of the AC[La-]+PCr during a one-legged knee extension (1L-KE) exercise. Thirteen physically active males were submitted to a graded exercise to determine the peak power output (PPO) in the 1L-KE. Then, two constant-load exercises were conducted to task failure at 100% (TTF100) and 110% (TTF110) of PPO, and the exercises were repeated on a third day. The blood lactate accumulation and the oxygen uptake after exercise were used to estimate the anaerobic lactic and alactic contributions, respectively. Higher values of AC[La-]+PCr were found after the TTF100 compared to TTF110 (p=0.042). In addition, no significant differences (p=0.432), low systematic error (80.9 mL), and a significant ICC (0.71; p=0.004) were found for AC[La-]+PCr in the TTF100. However, an elevated coefficient of variation was found (13.7%). In conclusion, we suggest the use of the exhaustive efforts performed at 100% of the PPO with the 1L-KE model, but its elevated individual variability must be carefully considered in future studies. [ABSTRACT FROM AUTHOR]
Databáze:	Complementary Index
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