بررسي ميزان مشاركت عوامل خستگي مركزي و محيطي پس از فعاليت زيربيشينه در شرايط مختلف (جنس و ريتم روزانه)

Contribution of peripheral and central fatigue in different conditions (Gender and time of day differences)

Purpose: The aim of the present study was to examine the rate of central and peripheral contributions in circadian rhythms and gender differences after exhausted sub maximal exercise. Methodology: 12 healthy male and female subjects (mean age of 23/5±l/37 years, height of 166/83±5/l 1cm, weight of 59/8±9/15 kg, vo2max of 33/14±4/71 lit.kg/min in male subjects and mean age of 23±6/32 years, height of 165/17±2/48, weight of 56±2/09 and vo2max of 29/05±2/89 lit.kg/min in female subjects) took part in this investigation. Central (Mvc, latency of H reflex, amplitude of H reflex and ratio of H reflex to M wave) and peripheral properties of fatigue (blood lactate and M wave) were recorded before and after an exhausted sub maximal exercise (Storer and Davies 1998) at two different times of day: 8 and 18 oʹclock which is separated by a week. Results: The result showed that significant differences were found in HR, blood lactate and latency of H reflex before and after exercise. However differences between male and female in Mvc, amplitude of H reflex, ratio of H reflex to M wave and M wave was significant. Conclusion: As induced -exercise central and peripheral fatigue was higher in men in the morning , our results suggest designing suitable training program for men and women is preferred afternoon and morning respectively. However, more study is needed to confirm this result, especially it is recommended to use transcranial magnetic stimulation.