Impact of Six Consecutive Days of Sprint Training in Hypoxia on Performance in Competitive Sprint Runners

Nobukazu Kasai; Sahiro Mizuno; Sayuri Ishimoto; Etsuko Sakamoto; Misato Maruta; Toshiyuki Kurihara; Yuko Kurosawa; Kazushige Goto

Ayuda

Impact of Six Consecutive Days of Sprint Training in Hypoxia on Performance in Competitive Sprint Runners

Nobukazu Kasai ^[1] ; Sahiro Mizuno ^[1] ; Sayuri Ishimoto ^[1] ; Etsuko Sakamoto ^[1] ; Misato Maruta ^[1] ; Toshiyuki Kurihara ; Yuko Kurosawa ^[1] ; Kazushige Goto
1. [1] Ritsumeikan University
  
  Ritsumeikan University
  
  Kamigyō-ku, Japón
Localización: Journal of strength and conditioning research: the research journal of the NSCA, ISSN 1064-8011, Vol. 33, Nº. 1, 2019, págs. 36-43
Idioma: inglés
Texto completo no disponible (Saber más ...)

Dialnet Métricas: 2 Citas

Resumen
- The purpose of this study was to determine the effects of 6 successive days of repeated sprint (RS) training in moderate hypoxia on anaerobic capacity in 100–200-m sprint runners. Eighteen male sprint runners (age, 20.0 ± 0.3 years; height, 175.9 ± 1.1 cm; and body mass, 65.0 ± 1.2 kg) performed repeated cycling sprints for 6 consecutive days in either normoxic (NOR; fraction of inspired oxygen [FiO2], 20.9%; n = 9) or hypoxic conditions (HYPO; FiO2, 14.5%; n = 9). The RS ability (10 × 6-second sprints), 30-second maximal sprint ability, maximal oxygen uptake (max), and 60-m running time on the track were measured before and after the training period. Intramuscular phosphocreatine (PCr) content (quadriceps femoris muscle) was measured by 31P-magnetic resonance spectroscopy (31P-MRS) before and after the training period. Both groups showed similar improvements in RS ability after the training period (p < 0.05). Power output during the 30-second maximal sprint test and max did not change significantly after the training period in either group. Running time for 0–10 m improved significantly after the training period in the HYPO only (before, 1.39 ± 0.01 seconds; after, 1.34 ± 0.02 seconds, p < 0.05). The HYPO also showed a significant increase in intramuscular PCr content after the training period (before, 31.5 ± 1.3 mM; after, 38.2 ± 2.8 mM, p < 0.05). These results suggest that sprint training for 6 consecutive days in hypoxia or normoxia improved RS ability in competitive sprint runners.