The Slow Component of Oxygen Uptake and Efficiency in Resistance Exercises: A Comparison With Endurance Exercises.

Autor: Garnacho-Castaño MV; GRI-AFIRS, School of Health Sciences, TecnoCampus-Pompeu Fabra University, Mataró, Spain., Albesa-Albiol L; GRI-AFIRS, School of Health Sciences, TecnoCampus-Pompeu Fabra University, Mataró, Spain., Serra-Payá N; GRI-AFIRS, School of Health Sciences, TecnoCampus-Pompeu Fabra University, Mataró, Spain., Gomis Bataller M; GRI-AFIRS, School of Health Sciences, TecnoCampus-Pompeu Fabra University, Mataró, Spain., Felíu-Ruano R; GRI-AFIRS, School of Health Sciences, TecnoCampus-Pompeu Fabra University, Mataró, Spain., Guirao Cano L; GRI-AFIRS, School of Health Sciences, TecnoCampus-Pompeu Fabra University, Mataró, Spain.; Department of Rehabilitation, Hospital Asepeyo, Barcelona, Spain., Pleguezuelos Cobo E; GRI-AFIRS, School of Health Sciences, TecnoCampus-Pompeu Fabra University, Mataró, Spain.; Department of Physical and Rehabilitation Medicine, Hospital de Mataró, Mataró, Spain., Maté-Muñoz JL; Department of Physical Activity and Sports Science, Alfonso X El Sabio University, Madrid, Spain.
Jazyk: angličtina
Zdroj: Frontiers in physiology [Front Physiol] 2019 Mar 28; Vol. 10, pp. 357. Date of Electronic Publication: 2019 Mar 28 (Print Publication: 2019).
DOI: 10.3389/fphys.2019.00357
Abstrakt: Introduction: There is a lack of information regarding the slow component of oxygen uptake (VO 2 sc) and efficiency/economy in resistance exercises despite the crucial role played in endurance performance.
Purpose: this study aimed to compare the VO 2 sc, efficiency/economy, metabolic, cardiorespiratory responses, rating of perceived effort and mechanical fatigue between cycling and half-squat (HS) exercises during a constant-load test at lactate threshold (LT 1 ) intensity.
Methods: Twenty-one healthy men were randomly assigned in a crossover design to perform cycle-ergometer or HS tests. The order of the two cycle ergometer tests was an incremental test for determining load-intensity in watts (W) at LT 1 , followed by a constant-load test at the LT 1 intensity. For the three HS tests, the order was a 1RM test to determine the load (kg) corresponding to the 1RM percentages to be used during the second test, incremental HS exercise to establish the load (kg) at the LT 1 intensity, and finally, a constant-load HS test at the LT 1 intensity. A rest period of 48 h between each test was established. During the HS and cycle-ergometer constant-load tests, cardiorespiratory and metabolic responses were recorded. Lower limbs fatigue was determined by a jump test before and after the constant-load tests.
Results: A significant exercise mode × time interaction effect was detected in VO 2 , heart rate, energy expenditure (EE), gross efficiency (GE), and economy ( p < 0.05). A significant and sustained VO 2 raise was confirmed in HS exercise ( p < 0.05) and a steady-state VO 2 was revealed in cycle-ergometer. A higher GE and economy were obtained in HS test than in cycle-ergometer exercise ( p < 0.001). In both exercises, a non-significant decrease was observed in GE and economy ( p > 0.05). Lower limbs fatigue was only detected after constant-load HS test.
Conclusion: Although the VO 2 , heart rate and EE responses were higher in cycling exercise, the constant-load HS test induced a greater VO 2 sc and EE raise than the cycling test in a predominantly aerobic metabolism. These results could explain a decrease observed in jump performance only after HS test. GE and economy could benefit from the eccentric phase of the HS exercise.
Databáze: MEDLINE
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