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Phys Act Nutr > Volume 24(3); 2020 > Article
Physical Activity and Nutrition 2020;24(3):7-12.
DOI: https://doi.org/10.20463/pan.2020.0015    Published online September 30, 2020.
Effects of endurance exercise under hypoxia on acid-base and ion balance in healthy males
Sang-Seok Nam1, Hun-Young Park2,3
1Taekwondo Research Institute of Kukkiwon, Seoul, Korea
2Department of Sports Medicine and Science of Graduated School, Konkuk University, Seoul, Korea
3Physical Activity and Performance Institute (PAPI), Konkuk University, Seoul, Korea
Correspondence:  Hun-Young Park, Tel: +82-2-2049-6035, 
Email: parkhy1980@konkuk.ac.kr
Received: 24 August 2020   • Revised: 14 September 2020   • Accepted: 14 September 2020
Abstract
[Purpose]
This study was performed to investigate the acid-base and ion balance at rest and after exercise in healthy males under normoxia, moderate hypoxia, and severe hypoxia.
[Methods]
Ten healthy Korean males completed three different trials on different days, comprising exercise under normoxia (FiO2 = 20.9%, N trial), moderate hypoxia (FiO2 = 16.5%, MH trial), and severe hypoxia (FiO2 = 12.8%, SH trial). They undertook endurance exercise for 30 min on a cycle ergometer at the same relative exercise intensity equivalent to 80% maximal heart rate under all conditions. Capillary blood samples were obtained to determine acid-base and ion balance at rest and after exercise.
[Results]
Exercise-induced blood lactate elevations were significantly increased as hypoxic conditions became more severe; SH > MH > N trials (P = 0.003). After exercise, blood glucose levels were significantly higher in the SH trial than in the N and MH trials (P = 0.001). Capillary oxygen saturation (SCO2) levels were significantly lowered as hypoxic conditions became more severe; SH > MH > N trials (P < 0.001). The pH levels were significantly lower in the MH trial than that in the N trial (P = 0.010). Moreover, HCO3- levels were significantly lower in the SH trial than in the N trial, with significant interaction (P = 0.003). There were no significant differences in blood Na+, K+, and Ca2+ levels between the trials.
[Conclusion]
MH and SH trials induced greater differences in glucose, lactate, SCO2, pH, and HCO3- levels in capillary blood compared to the N trial. Additionally, lactate, SCO2, and HCO3- levels showed greater changes in the SH trial than in the MH trial. However, there were no significant differences in Na+, K+, and Ca2+ levels in MH and SH trials compared to the N trial.
Key Words: acute hypoxia, metabolic stress, capillary blood, potassium kinetics, submaximal exercise, blood lactate, blood glucose


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