Excitability of the spinal cord alpha motor neuron changes with the diurnal rhythm.

2016 Fiscal Year Final Research Report

• Project/Area Number: 26870761
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Developmental mechanisms and the body works; Sports science
• Research Institution: University of Marketing and Distribution Sciences
• Principal Investigator: SEKI Kazutoshi 流通科学大学, 人間社会学部, 准教授 (30552210)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: H反射 / 日内変動 / 脊髄α運動ニューロン / 潜時 / 体温 / loop time

Outline of Final Research Achievements

The purpose of this study was investigated the correlation between increase and inhibition of autonomic nervous system and body temperature accompanied by diurnal variation and motor unit of recruitment threshold were compared in the morning (AM:9-10) and afternoon (PM:5-6). The test responses of autonomic nervous system activation accompanying rest were not observed effects in the AM and PM. In the response by exercise intensity, the loop time did not change in both AM and PM under no-exercise and low intensity exercise condition. The loop time of immediately after exercise was shortened as compared to the pre-exercise level only the medium intensity exercise condition at AM. In the high intensity exercise conditions, both in the AM and PM, the loop time were shorted immediately after exercise. It was suggested that the difference in the response of the loop time after medium intensity exercise at AM and PM influenced by the diurnal rhythm of body temperature.

Free Research Field

運動生理学