ACUTE METABOLIC RESPONSE AND HYDRATION STATUS DURING EXERCISE UNDER HYPOXIC CONDITION IN MALE COLLEGIATE FOOTBALL PLAYERS

Authors

  • Matinee Phangjaem Department of Sports Science and Sports Development, Faculty of Allied Health Science, Thammasat University
  • Salinee Chaiyakul Department of Physical Therapy, School of Allied Health Sciences and Public Health, Walailak University
  • Phakakrong Utsanon Sports Authority of Thailand, Region II Center (Suphan Buri)
  • Rungchai Chaunchaiyakul College of Sports Science and Technology, Mahidol University

Keywords:

Hypoxic/ Exercise / Metabolic function / Constant load / Dehydration

Abstract

Background: Simulated hypoxia has popularly been used to determine the short-term physiological responses to hypoxic condition. This study aimed to investigate the effect of acute hypoxic exposure on metabolic responses and hydration status during exercise in collegiate football players. Method: Six male collegiate football players voluntarily participated in this study. A randomized cross-over design was employed. Participants were asked to complete two exercise trials under Normoxic (NC: FIO2 21%) and Hypoxic (HC: FIO2 15%) conditions. The exercise trial was conducted on a cycle ergometer at a constant workload corresponding to 70% of O2peak for 60 min, followed by a 15-min recovery period. Metabolic variables, including oxygen consumption (O2), carbon dioxide production (CO2) and respiratory exchange ratio (RER) were measured at rest, during exercise at 20, 40, 60 min, and every 5-min intervals during the recovery period. Hydration status was analyzed before and after exercise. Result: All resting data were not different between two conditions. Whilst O2 and CO2 increased throughout the exercise period in both conditions (p<0.05), no significant difference was observed between NC and HC (p>0.05). Average RER were 0.88 and 0.91 at rest in NC and HC, respectively. RER were significantly increased from resting values (p<0.05), but there was no significant difference between conditions. During the recovery period, O2 and CO2 remained higher than the resting values in both conditions, suggesting that metabolic profiles were not fully recovered within 15 min. Urine specific gravity after exercise under HC was significantly higher than in NC. (p<0.05). Percent change of urine specific gravity under NC and HC were 0.5% and 1.2%, respectively. Conclusion: Metabolic responses during exercise under the acute hypoxic exposure did not differ from the normoxic condition. Therefore, the hypoxic condition (FIO2 15%) does not show significant negative effects during submaximal exercise in collegiate football players.

 

Journal of Sports Science and Technology 2018; 18(1): 27-36

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Published

2018-07-07

Issue

Volum 18 , No.1 , July 2018

Section

Sports and Exercise Physiology