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The purpose of this study was to compare the efficacy of high-intensity interval training (HIIT) in normobaric hypoxia and normoxia on aerobic capacity, critical power, and rowing performance in varsity Rowers.
Methods : Nineteen varsity rowers, aged 19-24 years old, from Chulalongkorn University rowing club. were recruited to participate in this study. The participants were randomly assigned to either the hypoxic group. (M=5,F=4) or normoxic group. (M=5,F=4) Both group completed HIIT (6 sets x 30s, 60s rest interval at 85-98%HRmax) on a rowing ergometer (Concept II) twice a week over a period of 6 weeks in addition to normal training. The hypoxic group trained in a hypoxic room with FiO2 of 15.3%, whereas the normoxic group trained at sea-level. Maximal oxygen uptake (VO2max), ventilation threshold(VT), critical power (CP) and 2,000 m time trial were measured before and after 6 weeks of training at normoxia. Data were expressed as means ±S.D. and analyzed using the dependent and independent sample t-test with a statistical significant at p-value <0.05
Results : There were no significant differences in the mean of age, body weight, BMI, percent fat, and lean body mass between groups before training. After 6 weeks of HIIT, both groups showed no significant changed in peak power output, VO2max and VT, but increased CP when compared to prior training (p<0.05). These changes were concomitant with an improvement of 2,000 m rowing time trial, with no difference detected between groups.
Conclusion : Our results demonstated that an addition of a 6-week of HIIT program to normal training elicited in improvements of CP and rowing performance in varsity rowers, regardless of hypoxic condition.
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