Author(s): C Sumanta Das and Dr. Atanu Ghosh

Abstract:
Circadian rhythm is a 24-hour psychological and physiological fluctuations. The purpose of this investigation was to evaluate the circadian effect on selected motor fitness components, heart rate and body temperature of the sprinter in winter month. Ten male sprinters (MEAN±SD; age23.88±1.35year; weight60±1.61kg, height165±1.42cm, with 3.0±2.0 year training period)were chosen. The motor fitness, heart rate and body temperature were chosen as variables. One way repeated measure ANOVA was used to find out mean difference is significant or not at three different time of day (8am, 12:00 pm and 4:00pm). Post-hoc test was used to identify differences between three different times of day (08am, 12:00pm and 4:00pm).The result of the investigation showed no significant circadian impact on speed, agility, explosive leg power and heart rate but significant difference was observed on body temperature. Where as speed, agility, explosive leg power, heart rate showed significantly mean variation. It is concluded that selected motor fitness and heart rate variables indicated no significant circadian effect but significant effect was observed on body temperature of male sprinters.

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