The Effect of ۲-Day Intermittent Hypoxia-Hyperoxic Training on Anaerobic Metabolism

Background: Researchers have studied practical applications of high-intensity interval training and hypoxic training. PGC-۱α, IGF-I, and HIF-۱α are generated from high-intensity interval training and affect muscle cells. Altitude training also produces HIF-۱α, which induces erythropoietin and increases the number of red blood cells. However, due to the limit on training intensity and cycle, it was replaced by normobaric hypoxia training. Purpose: To investigate the effects of ۲-day high-intensity interval training on muscular anaerobic metabolism at varying oxygen concentrations for ۲ days. Method: Ten subjects performed ۲ consecutive days of intermittent hypoxia-hyperoxic training (IHHT); intensity of training was determined by the sprint test results. IHHT comprised ۴ sets of ۳ repetitions for ۴۰ seconds (۴ × ۳ × ۴۰ s); the intensity and oxygen concentration were ۸۰% of maximal effort and ۱۳% oxygen for the first and third sets, and were ۹۰% of maximal effort and ۲۱% oxygen for the second and fourth set; participants walked for ۳ min wearing an oxygen mask (O۲ ۸۰%) before each set. Differences in biological parameters between the two days of training was analyzed by t-test. Results: The difference of mean lactate levels between two days were ۰.۹۶ ± ۰.۷۵ mmol/l at Set ۳ (P = .۰۰۳) and ۱.۰۵ ± ۱.۱۲ mmol/l at Set ۴ (P = .۰۱۶), respectively. Mean ammonia concentrations at Set ۴ were ۱۱۷.۷۰ ± ۲۹.۸ μmol/l for the first day and ۹۴.۵۰ ± ۱۴.۴۵ μmol/l for the second day (P = .۰۵۷). The difference of heart rate were ۴.۲۰ ± ۵.۰۵ min-۱ at Set ۱ (P = .۰۲۷) and ۴.۰۰ ± ۵.۴۸ min-۱ at Set ۲ (P = .۰۴۶). Conclusions: Two-day intermittent hypoxia-hyperoxic training affected lactate and heart rate.

Keywords:

Hypoxic , Lactate , Heart Rate