title: Cognitive Function and Cerebral Oxygenation During Prolonged Exercise Under Hypoxia in Healthy Young Males.
abstract: Dobashi, Shohei, Masahiro Horiuchi, Junko Endo, Masataka Kiuchi, and Katsuhiro Koyama. Cognitive function and cerebral oxygenation during prolonged exercise under hypoxia in healthy young males. High Alt Med Biol. 17:214-221, 2016.-The present study examined the effect of prolonged hypoxic exercise on cognitive function. Eight healthy male volunteers were required to complete exercise trials (four 30-minute cycling sessions with a 15-minute rest interval) at an intensity corresponding to 50% of their altitude-adjusted peak oxygen uptake under two different conditions: normoxia (room air at 400 m) and hypoxia (fraction of inspired oxygen: 0.141). Cognitive function was evaluated before, during, and 60 minutes after completion of the exercise trial. The color-word Stroop task (CWST) was used to assess cognitive function, with regard to the number of achievements, accuracy rate, and the number of correct responses made within 60 seconds. Cerebral oxygenation was monitored throughout the experimental period using near-infrared spectroscopy. The accuracy rate did not significantly differ between the two trials. A significant reduction in the number of correct responses during simple CWST tasks was detected in the hypoxic condition 60 minutes after exercise (p < 0.05), wherein a significant correlation was identified between reduced task performance on simple CWST and cerebral oxygenation (p < 0.01). These results demonstrate that prolonged exercise under hypoxic conditions induces a reduction in cerebral oxygenation partly associated with impairment of cognitive function.
authors: 1 Integrated Graduate School Department of Medicine, Engineering, and Agricultural Sciences, University of Yamanashi , Kofu, Japan .
authors: Shohei
authors: S
authors: Dobashi
authors: 2 Division of Human Environmental Science, Mt. Fuji Research Institute , Fujiyoshida, Japan .
authors: Masahiro
authors: M
authors: Horiuchi
authors: 2 Division of Human Environmental Science, Mt. Fuji Research Institute , Fujiyoshida, Japan .
authors: Junko
authors: J
authors: Endo
authors: 3 Graduate School Department of Education, University of Yamanashi , Kofu, Japan .
authors: Masataka
authors: M
authors: Kiuchi
authors: 4 Graduate School Department of Interdisciplinary Research, University of Yamanashi , Kofu, Japan .
authors: Katsuhiro
authors: K
authors: Koyama
keywords: cerebral oxygenation; cognitive function; color-word Stroop task; hypoxia