The Study Of Nap On Physical Function For Athletes

Objective:In the study, apply a series of body function indicators to research the physical functions of naps for athletes, and analyse the"sleep inertia" and the correlation between EEG and HRV, try to use HRV to reflect the situation of naps, then serve the training and competition.Method:15 male sprinters participated in the experiment, all at the national level or above. As the causes of experimental methods and man-made, so only took 12 integrated data finally. Subjects were tested three times randomly, one day take a nap for 60 minutes, other day take a nap for 60 minutes, the last day didn't nap. They were fetched finger blood after high intensity training in the mooning, then taken mood states, heart rate, blood pressure, reaction time, flicker fusion frequency and EEG indicators testing in turn after lunch. The nap groups taken a nap for 60 minutes or 90 minutes at 13:00, while no nap group didn't nap. EEG and heart rate were taken during sleep. The 60-minute group was taken twice tests at 14:30 and 15:00 pm respectively, while the 90-minute group and no nap group were taken post-nap test at 15:00 pm, the order and methods of test were same with the pre-nap test, then fetched blood finally.Result:1. To improve the body nerves, muscles excitability, the 60-minute nap is better than the 90-minute nap; but in cardiovascular and metabolism, the 90-minute nap is better than 60-minute nap.2. Nap for 60 minutes, the level of brain function, muscle excitability and mood state are still at a low level half-hour after wake up, but improve significantly 1 hour after wake up.3. There are twice S2 sleep in 60-minute nap, it is approximately 50% of total sleep time, and no REM sleep; it appears twice S2 and S3 sleep respectively in 90-minute nap, S3 sleep is approximately 50% of total sleep time, no REM sleep too.4. There are great relevance between HR, HF, LF/HF index of Heart rate variability with the EEG and structure of sleep. With the extension of depth and duration of sleep, the HR and LF/HF values decrease, while the HF value gradually increase.Conclusion:1. Different duration naps all can improve the brain functional status and awakening level, reduce fatigue and recover physical fitness after training for athletes, but the effect is different.2. "Sleep inertia " duration may be longer than 30 minutes,1 hour is basically subsided.3. In the course of two short time naps, after waking, S1, S2 and S3 sleep, it re-entry into S2 and S3 sleep until awake up, there was no REM sleep.4. HRV can be carried out to analysis the structure of sleep and evaluate the quality of nap, so that select the appropriate nap.