Effects of strength training under hypoxic conditions on muscle performance, body composition and haematological variables

Martinez Guardado, Ismael; Sanchez Urena, Braulio; Camacho Cardenosa, Alba; Camacho Cardenosa, Marta; Olcina Camacho, Guillermo; Timon Andrada, Rafael

Abstract

The addition of a hypoxic stimulus during resistance training is suggested to increase the metabolic responses, enhancing hypertrophy and muscle strength. The purpose of this study was to investigate the effects of resistance training performed at submaximal intensities combined with normobaric hypoxia on muscular performance, body composition and haematological parameters. Thirty-two untrained subjects participated in this study (weight: 74.68-+/- 12.89 kg; height: 175 +/- 0.08 cm; BMI: 24.28 +/- 3.80 kg/m(2)). They were randomized to two groups: hypoxia (FiO(2) = 13%) or normoxia (FiO(2) = 20.9%). The training programme lasted 7 weeks (3 d/w) and several muscle groups were exercised (3 sets x 65-80% 1RM to failure). Measurements were taken before, after the training and after a 3-week detraining period. Body composition and muscle mass were assessed through skinfolds and muscle girths. Muscle strength was evaluated by the 1RM estimated test. Finally, haemoglobin and haematocrit were taken from the antecubital vein. Both groups improved their strength performance and muscle perimeters, but the hypoxia group obtained a greater increase in muscle mass (hypoxia: +1.80% vs. normoxia: +0.38%; p0.05) and decrease in fat mass (hypoxia: -6.83% vs. normoxia: +1.26%; p0.05) compared to the normoxia group. Additionally, haematocrit values were also higher for the hypoxia group after the detraining period (hypoxia: +2.20% vs. normoxia: -2.22%; p0.05). In conclusion, resistance training under hypoxic conditions could increase muscle mass and decrease fat mass more effectively than training performed in normoxia, but without contributing to greater muscle strength.

Más información

Título según WOS: ID WOS:000526722200003 Not found in local WOS DB
Título de la Revista: BIOLOGY OF SPORT
Volumen: 37
Número: 2
Editorial: TERMEDIA PUBLISHING HOUSE LTD
Fecha de publicación: 2020
Página de inicio: 121
Página final: 129
DOI:

10.5114/biolsport.2020.93037

Notas: ISI