Int J Sports Med 2024; 45(05): 359-368
DOI: 10.1055/a-2207-2578
Training & Testing

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

1   School of Physical Education and Sport of Ribeirão Preto, University of Sao Paulo, Ribeirão Preto, Brazil
,
2   Human Movement Research Laboratory (MOVI-LAB), São Paulo State University, Bauru, Brazil
,
Danilo Rodrigues Bertucci
3   Department of Sport Sciences, Institute of Health Sciences, Federal University of Triangulo Mineiro, Uberaba, Brazil
,
4   Ribeirão Preto Medical School, University of Sao Paulo, Ribeirão Preto, Brazil
,
Ricardo Augusto Barbieri
5   Department for Life Quality Studies, University of Bologna - Rimini Campus, Rimini, Italy
,
Marcelo Papoti
1   School of Physical Education and Sport of Ribeirão Preto, University of Sao Paulo, Ribeirão Preto, Brazil
› Author Affiliations

Funding Information Fundação de Amparo à Pesquisa do Estado de São Paulo — the grant numer 16/12781-5; 16/09339–9
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Abstract

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.



Publication History

Received: 13 June 2023

Accepted: 08 November 2023

Accepted Manuscript online:
08 November 2023

Article published online:
12 February 2024

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