Study On Change Of Heart Rate Variabilty After Acute Hypoxic Exhausive Exercise

Object:Observe the change of heart rate variability(HRV) before and after an acute exhaustive exercise and the regulation of autonomic nerves of cardiovascular system during recovery period(5-10 min) after acute exhaustive exercise at sel-level and 2000m altitude,aiming at providing non-invasive index for monitoring altitude training.Methods:Nine participants in Beijing Sports University performed an acute exhaustive exercise every other week at normoxia(normoxia exercise group,NE),at simulating normobaric hypoxia(FiO2=16.2%,2000m,acute hypoxic exercise group,HE) and after 12h acute hypoxic exposure(hypoxic pre-condition exercise group,H12E) respectively.HRV(TP、LF、HF、LF/HF、LFn、HFn) and related physiological and biochemistrical index(gasometry, gasometry,noradrenalin,lactic acid) were measured before an after exercise.Results:TP,LF,HF,HFn decreased and LF/HF,LFn increased significantly after exercise compared with before in all groups.TP,LF decreased significantly after exercise in NE compared with H12E.LFn,HFn decreased significantly after exercise in HE compared with H12E.Conclusion:HRV could well reflect the regulation of autonomic nerves of cardiovascular system during exercise in different concentration of oxygen.LFn,HFn of HRV are the sensitive indexes in short time recovery after an acute exhausive exercise in acute hypoxic exercise and hypoxic pre-condition exercise,suggesting HRV is a non-invasive sensitive and potential useful index for monitoring altitude training.