테니스 훈련이 자발적 온열부하 중 중추피로와 관련한 프로락틴, 심부 온 및 온열 불쾌감에 미치는 영향

Abstract

The purpose of this study is to examine whether the tennis training experience improves the tolerance to central fatigue caused by thermal stress. In order to verify it, prolactin (PRL) which is an indirect biological marker of central serotonergic and dopaminergic substance activity is analyzed and the record of tympanic temperature (Tty) and thermal discomfort (TD) is observed. In this study, 14 women of age 30s are divided into a control group which does not have any regular physical activity (n=7, age, 37.3±3.5 yrs, height, 160.9±1.6 cm, weight, 51.2±4.2 kg, V·O_2max, 31.8±0.9 ml·kg^-1·min^-1) and a trainee group (n=7, age, 38.6±5.4 yrs, height, 162.5±1.9 cm, weight, 52.7±4.3 kg, V·O_2max, 38.31±4.9 ml·kg^-1·min^-1) which has experience to participate in tennis activities on a regular basis for more than 1 year (three times a week, 120 min, 40 min/day). Passive heating (PH) method which takes half bath at warm water (41℃) for 30 min is applied. Results showed that PRL levels after PH was significantly lower in a trainee than in a control (p<.001), and Tty was also significantly lower at time points of 10 min and 15 min (p<.05). It was confirmed that TD was also significantly lower in a trainee group than in a control group at time points of 25 min and 30 min (p<.05). The fact which can be presented through this study is that the possibility in which the ratio of serotonin/dopamine activity is significantly reduced in a target group participating in tennis training under the condition of same thermal stress. The cause could be that the tolerance to the central fatigue caused by thermal stress is improved.