Four-week experimental plus 1-week taper period using live high train low does not alter muscle glycogen content.

Autor: Bertucci DR; Triângulo Mineiro Federal University (UFTM), Av. Frei Paulino, nº 30, Abadia, Uberaba, MG, Brazil., de Carvalho CD; Ribeirão Preto Medical School, University of São Paulo (FMRP-USP), Avenida Bandeirantes, 3900, Vila Monte Alegre, Ribeirão Prêto, SP, Brazil. carlos_dellavechia@hotmail.com., Scariot PPM; Faculty of Applied Sciences, State University of Campinas (FCA-UNICAMP), R. Pedro Zaccaria, 1300, Limeira, SP, Brazil., Kalva-Filho CA; Human Movement Research Laboratory (MOVI-LAB), São Paulo State University (UNESP), Av. Eng. Luiz Edmundo C. Coube, nº 14-01, Núcleo Habitacional Presidente Geisel, Bauru, SP, Brazil., Luches-Pereira G; School of Physical Education and Sports of Ribeirão Preto, University of São Paulo (EEFERP-USP), Avenida Bandeirantes, 3900, Vila Monte Alegre, Ribeirão Preto, SP, Brazil., Arruda TB; Ribeirão Preto Medical School, University of São Paulo (FMRP-USP), Avenida Bandeirantes, 3900, Vila Monte Alegre, Ribeirão Prêto, SP, Brazil., Alves IS; School of Physical Education and Sports of Ribeirão Preto, University of São Paulo (EEFERP-USP), Avenida Bandeirantes, 3900, Vila Monte Alegre, Ribeirão Preto, SP, Brazil., Gardim CB; Ribeirão Preto Medical School, University of São Paulo (FMRP-USP), Avenida Bandeirantes, 3900, Vila Monte Alegre, Ribeirão Prêto, SP, Brazil., Castiglia M; Ribeirão Preto Medical School, University of São Paulo (FMRP-USP), Avenida Bandeirantes, 3900, Vila Monte Alegre, Ribeirão Prêto, SP, Brazil., Riberto M; Ribeirão Preto Medical School, University of São Paulo (FMRP-USP), Avenida Bandeirantes, 3900, Vila Monte Alegre, Ribeirão Prêto, SP, Brazil., Gobatto CA; Faculty of Applied Sciences, State University of Campinas (FCA-UNICAMP), R. Pedro Zaccaria, 1300, Limeira, SP, Brazil., Papoti M; Ribeirão Preto Medical School, University of São Paulo (FMRP-USP), Avenida Bandeirantes, 3900, Vila Monte Alegre, Ribeirão Prêto, SP, Brazil.; School of Physical Education and Sports of Ribeirão Preto, University of São Paulo (EEFERP-USP), Avenida Bandeirantes, 3900, Vila Monte Alegre, Ribeirão Preto, SP, Brazil.
Jazyk: angličtina
Zdroj: European journal of applied physiology [Eur J Appl Physiol] 2024 Jun; Vol. 124 (6), pp. 1795-1805. Date of Electronic Publication: 2024 Jan 17.
DOI: 10.1007/s00421-023-05404-z
Abstrakt: This study aimed to investigate the effects of a 4-week live high train low (LHTL; FiO 2  ~ 13.5%), intervention, followed by a tapering phase, on muscle glycogen concentration. Fourteen physically active males (28 ± 6 years, 81.6 ± 15.4 kg, 179 ± 5.2 cm) were divided into a control group (CON; n = 5), and the group that performed the LHTL, which was exposed to hypoxia (LHTL; n = 9). The subjects trained using a one-legged knee extension exercise, which enabled four experimental conditions: leg training in hypoxia (TL HYP ); leg control in hypoxia (CL HYP , n = 9); leg trained in normoxia (TL NOR , n = 5), and leg control in normoxia (CL NOR , n = 5). All participants performed 18 training sessions lasting between 20 and 45 min [80-200% of intensity corresponding to the time to exhaustion (TTE) reached in the graded exercise test]. Additionally, participants spent approximately 10 h day -1 in either a normobaric hypoxic environment (14.5% FiO 2 ; ~ 3000 m) or a control condition (i.e., staying in similar tents on ~ 530 m). Thereafter, participants underwent a taper protocol consisting of six additional training sessions with a reduced training load. SpO 2 was lower, and the hypoxic dose was higher in LHTL compared to CON (p < 0.001). After 4 weeks, glycogen had increased significantly only in the TL NOR and TL HYP groups and remained elevated after the taper (p < 0.016). Time to exhaustion in the LHTL increased after both the 4-week training period and the taper compared to the baseline (p < 0.001). Although the 4-week training promoted substantial increases in muscle glycogen content, TTE increased in LHTL condition.
(© 2024. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)
Databáze: MEDLINE
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