Oxygen Uptake Slow Component and the Efficiency of Resistance Exercises
-
Manuel Vicente Garnacho Castaño ; Lluis Albesa Albiol [1] ; Noemí Serra Payà ; Manuel Gomis Bataller ; Eulogio Pleguezuelos Cobo ; Lluís Guirao Cano ; Jesús Guodemar Pérez ; Teresa Carbonell i Camós ; Rául Domínguez Herrera ; José Luis Maté Muñoz
-
[1] Universitat Pompeu Fabra
Universitat Pompeu Fabra
Barcelona, España
-
- Localización: Journal of strength and conditioning research: the research journal of the NSCA, ISSN 1064-8011, Vol. 35, Nº. 4, 2021, págs. 1014-1022
- Idioma: inglés
- Texto completo no disponible (Saber más ...)
- Dialnet Métricas: 1 Cita
-
Resumen
This study aimed to evaluate oxygen uptake slow component (V[Combining Dot Above]O2sc) and mechanical economy/efficiency in half squat (HS) exercise during constant-load tests conducted at lactate threshold (LT) intensity. Nineteen healthy young men completed 3 HS exercise tests separated by 48-hour rest periods: 1 repetition maximum (1RM), incremental-load HS test to establish the %1RM corresponding to the LT, and constant-load HS test at the LT. During the last test, cardiorespiratory, lactate, and mechanical responses were monitored. Fatigue in the lower limbs was assessed before and after the constant-load test using a countermovement jump test. A slight and sustained increase of the V[Combining Dot Above]O2sc and energy expended (EE) was observed (p < 0.001). In blood lactate, no differences were observed between set 3 to set 21 (p > 0.05). A slight and sustained decrease of half squat efficiency and gross mechanical efficiency (GME) was detected (p < 0.001). Significant inverse correlations were observed between V[Combining Dot Above]O2 and GME (r = -0.93, p < 0.001). Inverse correlations were detected between EE and GME (r = -0.94, p < 0.001). Significant losses were observed in jump height ability and in mean power output (p < 0.001) in response to the constant-load HS test. In conclusion, V[Combining Dot Above]O2sc and EE tended to rise slowly during constant-load HS exercise testing. This slight increase was associated with lowered efficiency throughout constant-load test and a decrease in jump capacity after testing. These findings would allow to elucidate the underlying fatigue mechanisms produced by resistance exercises in a constant-load test at LT intensity.
