Acute Effects of Aerobic Exercise on Autonomic Nervous Function in Adolescents

Objectives:The present study investigated autonomic recovery following an acute bout of moderate intensity aerobic exercise in adolescent individuals.Methods:Sixty health participants(half was male,age:male,22±2yrs,female,23±2yrs)underwent measurements of HRmax andVO2peak by Bruce model(FreeMotion;Fitness Blowout,USA)in the first test,and then underwent measurements of participants' characteristics at baseline and heart rate(HR),heart rate variability(HRV),baroreflex sensitivity(BRS),and spontaneous breathing frequency(BF)at pre,30 minutes and 60 minutes post exercise in 48 hours to 2 weeks after the first test.Target HR of acute aerobic exercise =(HRmax-HRrest)70% + HRrest).Results:The changes of LnHF,LnLF/HF,LnRMSSD,HR,LnRRI,and BRSup-up were significant difference(P<0.05)analyzed by 23(2genders3time points)repeated measures ANOVA;There were significant positive correlations between LnHF and LnRMSSD(r=0.949,P=0.000),LnHF and BRSup-up(r=0.633,P=0.000)and there were significant negative correlations between nHF and LnLF/HF(r=-0.674,P=0.000),VO2peak and HR(r=-0.416,P=0.000).Conclusion:1)The acute change of autonomic recovery was different between men and women following an acute bout of moderate intensity aerobic exercise.Male adolescent exhibited delayed autonomic recovery following exercise when compared to female.2)This delay in autonomic recovery is believed to result from a slower recovery of PSNS,estrogen may contribute to the difference.3)HR recovery(HRR)and autonomic balance function recovery are not synchronized following exercise,the differences of aerobic exercise capacity may affect the HRR.