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| Relationships Beteween Biochemical Indices and AMS on Simulated Exposure to High Altitude After Endurance Training of Different Intensities |
| TIAN Kaixin, LONG Min,YU Yang, QIN Jun, HUANG Lan, YU Shiyong |
| Department of Cardiology, No. 42 Hospital of PLA, Jiajiang, Sichuan 614100, China |
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Abstract Objective To explore the relationship between biochemical indices in the blood of the autonomic nervous system(ANS) and acute mountain sickness (AMS) on simulated exposure to high altitude after endurance training of different intensities.Methods A total of 43 trained recruits were exposed to a simulated altitude of 4500 m for 8 weeks, 15 of whom were in current military drill group, 15 in aerobic endurance group, and 13 in anaerobic endurance group.Plasma norepinephrine (NE), epinephrin (EPI), plasma renin activity (PRA), neuropeptide Y (NPY) were measured at the end of exposure in a hypobaric chamber (4500 m,24 h). Their AMS symptoms were scored. Results (1) Plasma NE concentration decreased significantly in the three groups 24h after acute exposure to a simulated altitude of 4500 m (P<0.05), especially in the current military drill group (P<0.05) while plasma EPI concentration in the current military drill group and aerobic endurance group increased significantly (P<0.01). (2)PRA of the current military drill group and anaerobic endurance group decreased significantly (P<0.01), especially in current military drill group (P<0.01).(3) There was no statistically significant difference in NPY between the three groups after 8-week training and at a simulated altitude of 4500 m for 24 h(P>0.05).(4) The symptom score of AMS was positively related to plasma concentration of NE, PRA and NPY 8 weeks after training and to the change of NE and PRA before and after exposure(P<0.05). (5) The morbidity of AMS was 100%, and the symptom score of current military drill group was higher than that in anaerobic endurance group(P<0.05).There was no statistically significant difference in SCL-90 between the three groups(P>0.05).A significant positive correlation was found between AMS scores and SCL-90 scores in current military drill group and aerobic endurance group (P<0.05).Conclusion Functions of ANS are severely suppressed on the first day of current military drill and aerobic endurance training , which hinders acclimatization to acute exposure to high altitude. However, anaerobic endurance training can sustain the ANS function stabilization and enchance its ability of regulation, which is conducive to adaptation to acute exposure to high altitude.
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Published: 02 November 2016
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2016, Vol. 34 
