運動終了後の眼球圧迫および無呼吸による心拍減衰応答  [in Japanese] EFFECT ON DECLINE IN HEART RATE INDUCED BY OCULAR COMPRESSION AND APNEA AFTER EXERCISE  [in Japanese]

Object: The purpose of this study was to test the response of the decline in heart rate (HR) induced by compression on the eyeball (eyeball pressure: EP) and voluntary non breath (VNB) after pedaling exercise. Methods: EP; Nine male subjects performed exercise for 3 min in a supine position using a bicycle ergometer. Immediately after the exercise all subjects received EP for 10 seconds. After that, subjects undertook the same protocol without EP (CON-E). VNB; Four male and two female subjects performed exercise for 5 minutes using a bicycle ergometer. Immediately after the exercise subjects received VNB for 7 seconds. After that subjects undertook the same protocol without VNB(CON-V). Results: The slope of the decline in HR recovery (HR_<DS>) after exercise in EP increased signifi-cantly more than that in CON-E (p<0.05). However, time constant (HR_<TC>) in CON-E declined faster than that in EP. Thereby, the relationship between HR_<DS> in EP and HR_<TC> in CON-E corre-lated (r=-0.562). The HR_<DS> of VNB was greater than that of EP and CON-V. However the relationship between HR_<DS> in VNB and HR_<TC> in CON-V did not correlate. Conclusion : We suggest that EP affects vagal nervous activity and VNB affects strength of baroreflex sensitivity. Therefore HR_<DS> of EP might evaluate vagal nervous activity.