Application of Zipf's Law in Analysis of Heartbeat Dynamics during Coriolis Acceleration
To provide a technique for real-time autonomic response evaluation in vestibular adapta-tion training,Zipf's law was applied in heart-beat dynamics of Coriolis acceleration.Twenty-five male volunteers were asked to complete two tests:Rotating in 180°/s for 2 min with active roll head movement test 1 and rotating in 180°/s for 2 min with active pitch head movement test 2.The heart-beat dynamics was analyzed according to Zipf's law using heart rate data recorded by Polar tester.Eight heart rate patterns with higher probabilities were detected in Coriolis acceleration,in which heart rate deceleration was dominant.The difference between the heart rate patterns in the two tests was 0.27%±0.05%.Compared with the middle-aged group,the youth group had a heart rate pat-tern with higher vagal responses(P＜0.006).And in contrast to the group with training experiences(0.15%±0.03%),the group without training experiences had greater pattern difference between the two tests(0.43%±0.10%)and a heart rate mode with raised vagal responses(P＜0.05).The training experiences played a more important role than the factor of age in vestibuloautonomic re-sponses.There was a negative correlation between the symptom scores of motion sickness and the body temperature variations(r=-0.459,P＜0.007).And the changes of body temperature were positively correlated with the three most common heart rate patterns(r=0.396～0.459,P＜0.03).The method of heart rate patterns settled by Zipf's law revealed the physiological responses to Coriolis acceleration.It can be a potential technique applicable to the autonomic response assess-ment in vestibular stimuli.
Zipf's lawCoriolis accelerationheartbeat dynamicsvestibular autonomic responsesvestibular training
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