自転車エルゴメーター運動後の仰臥位フローティングが直腸温および心臓副交感神経系活動に及ぼす影響

Abstract

This study was performed to determine the effects of supine floating on rectal temperature and activity of cardiac parasympathetic nervous system after 15 min. high (80% VO2 max) and moderate (60% VO2 O2 max) intensity exercise with a cycle ergometer. Seven healthy males volunteered for this study. Subjects maintained their supine position for 30 minutes on a bed (C-condition) or on water (floating, W-condition) after exercise. Water temperature was 30. Heart rate, blood pressure, rectal temperature, oxygen uptake and cardiac autonomic nervous system activity were measured during the experimental period. || The autonomic nervous system activity was estimated with a power spectrum analysis of heart rate variability. During high and moderate intensity exercise, rectal temperature increased about 1.2 and 0.8 after exercise, respectively. During the recovery process, rectal temperature was significantly reduced (p<0.05) under the W-condition, as compared to the C-condition. Also, logarithms High Frequency (logHF ) was significantly increased (p<0.05) under the W-condition, as compared to the C-condition, during high and moderate intensity exercise. The increase in logHFwas caused by the bradycardia reflex, which increased central venous pressure and the arterial baroreceptor. These data suggest that supine floating after high and moderate intensity exercise with a cycle ergometer could promote the recovery of rectal temperature and increased the activity of cardiac parasympathetic nervous system which was inhibited by exercise.