《Chinese Journal of Rehabilitation Theory and Practice》 ›› 2018, Vol. 24 ›› Issue (1): 29-36.doi: 10.3969/j.issn.1006-9771.2018.01.006

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Influence of Circadian Rhythm Disruptions on Exercise Endurance, Blood Pressure and Heart Rate after Exercise in Rats

LI Yi1, WANG Wen-zhu2,3,4, ZHANG Yu-ge1, SHEN Jia-yi1, ZHANG Tong1,5   

  1. 1. Capital Medical University School of Rehabilitation Medicine, Beijing 100068, China
    2. China Rehabilitation Medicine Institute, China Rehabilitation Science Institute, Beijing 100068, China
    3. Beijing Institute for Brain Disorders Neural Injury and Repair Center, Beijing 100068, China
    4. Beijing Key Laboratory of Neural Injury and Rehabilitation, Beijing 100068, China
    5. Neurorehabilitation Center, Beijing Bo'ai Hospital, China Rehabilitation Research Centre, Beijing 100068, China
  • Received:2017-08-17 Revised:2017-12-04 Published:2018-01-25 Online:2018-01-31
  • Contact: ZHANG Tong.E-mail:zt61611@sohu.com
  • Supported by:
    Special Fund Project for Basic Scientific Research Business of Central Public Scientific Research Institute (No. 2017CZ-1) and China Rehabilitation Research Center Project (No. 2017ZX-4; No. 2017ZX-10)

Abstract: Objective To observe the influence of circadian rhythm disruptions on exercise capability in rats.Methods A total of 30 spontaneously hypertensive rats (SHR) and age and weight matched homologous normal blood pressure WKY rats were randomly divided into normal circadian rhythm group (control group), twelve hours circadian rhythm disruption group (observation group 1), six hours circadian rhythm disruption group (observation group 2). Each group included ten SHR rats and WKY rats, changing the light/dark time to construct circadian rhythm disruption model. Exercise endurance, blood pressure and heart rate after exhaustion were measured before and one, two and three months after modeling.Results The interaction of time and circadian rhythm was significant on the exhaustion time of SHR rats (F=2.409, P=0.047). After three months of modeling, the exhaustion time of the control group was more than that of the observation groups 1 and 2 (F=4.290, P=0.032). The interaction of time and circadian rhythm was not significant on the exhaustion time of WKY rats (F=0.717, P=0.638), there was no significant difference in the exhaustion time among groups (P>0.05). For SHR rats, after three months of modeling, the systolic pressure, diastolic pressure and mean arterial pressure after exhaustion of the observation group 1 were higher than those of the control group and the observation group 2 (P<0.05), the heart rate of the observation groups 1 and 2 was higher than that of the control group (P<0.05). But there was no significant difference in the systolic pressure, diastolic pressure, average arterial pressure and heart rate of WKY rats among groups (P>0.05).Conclusion Circadian rhythm disruptions can reduce the exercise endurance of SHR rats, which may be related to the cardiovascular function impairment.

Key words: hypertension, circadian rhythm disruptions, exercise endurance, blood pressure, heart rate, rats

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