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- Title
Four-week experimental plus 1-week taper period using live high train low does not alter muscle glycogen content.
- Authors
Bertucci, Danilo R.; de Carvalho, Carlos Dellavechia; Scariot, Pedro P. M.; Kalva-Filho, Carlos A.; Luches-Pereira, Gabriel; Arruda, Tarine B.; Alves, Isabela S.; Gardim, Camila B.; Castiglia, Marcelo; Riberto, Marcelo; Gobatto, Claudio Alexandre; Papoti, Marcelo
- Abstract
This study aimed to investigate the effects of a 4-week live high train low (LHTL; FiO2 ~ 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 (TLHYP); leg control in hypoxia (CLHYP, n = 9); leg trained in normoxia (TLNOR, n = 5), and leg control in normoxia (CLNOR, 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% FiO2; ~ 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. SpO2 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 TLNOR and TLHYP 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.
- Subjects
GLYCOGEN; FATIGUE (Physiology); EXERCISE tests; HYPOXEMIA; MUSCLE metabolism
- Publication
European Journal of Applied Physiology, 2024, Vol 124, Issue 6, p1795
- ISSN
1439-6319
- Publication type
Article
- DOI
10.1007/s00421-023-05404-z