In:
Journal of Strength and Conditioning Research, Ovid Technologies (Wolters Kluwer Health), Vol. 35, No. 4 ( 2021-04), p. 1014-1022
Abstract:
Garnacho-Castaño, MV, Albesa-Albiol, L, Serra-Payá, N, Gomis Bataller, M, Pleguezuelos Cobo, E, Guirao Cano, L, Guodemar-Pérez, J, Carbonell, T, Domínguez, R, and Maté-Muñoz, JL. Oxygen uptake slow component and the efficiency of resistance exercises. J Strength Cond Res 35(4): 1014–1022, 2021—This study aimed to evaluate oxygen uptake slow component (V̇ o 2 sc) 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 V̇ o 2 sc 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 V̇ o 2 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, V̇ o 2 sc 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.
Type of Medium:
Online Resource
ISSN:
1064-8011
DOI:
10.1519/JSC.0000000000002905
Language:
English
Publisher:
Ovid Technologies (Wolters Kluwer Health)
Publication Date:
2021
detail.hit.zdb_id:
2142889-X
SSG:
31
Permalink