OBJECTIVE: To investigate the associations between heart rate variability (HRV) and weight status in children. METHOD: Following ethics approval, 182 children (87 males, 95 females) aged between 6 and 11 years old (Mean (SD) age 9.1 (1.4) years) were assessed for height and body mass from which body mass index (BMI, kg/m(2)) was calculated. Data were collected in Central England, March-June 2011. Resting HRV was assessed in the supine position. Time domain (RMSSD and pNN50) and frequency domain (HF and LF power (ms(2)), LF/HF ratio) measures of HRV were calculated. Pearson correlations were used to assess the associations between BMI and HRV parameters. Differences in HRV parameters according to gender or weight status were analysed using t-tests. RESULTS: BMI was significantly and inversely related to RMSSD (r=-0.23, p=0.001) and pNN50 (r=0.20, p=0.008) but not frequency domain measures of HRV (p>0.05). Overweight/obese children demonstrated lower HF power compared to normal weight children (p=0.02). RMSSD and pNN50 were significantly lower in overweight/obese children compared to normal weight children (p<0.05). Age was associated with changes in Mean R-R and RMSSD (p<0.05). CONCLUSION: This exploratory study suggests that HRV is reduced in overweight/obese children.
OBJECTIVE: To investigate the associations between heart rate variability (HRV) and weight status in children. METHOD: Following ethics approval, 182 children (87 males, 95 females) aged between 6 and 11 years old (Mean (SD) age 9.1 (1.4) years) were assessed for height and body mass from which body mass index (BMI, kg/m(2)) was calculated. Data were collected in Central England, March-June 2011. Resting HRV was assessed in the supine position. Time domain (RMSSD and pNN50) and frequency domain (HF and LF power (ms(2)), LF/HF ratio) measures of HRV were calculated. Pearson correlations were used to assess the associations between BMI and HRV parameters. Differences in HRV parameters according to gender or weight status were analysed using t-tests. RESULTS: BMI was significantly and inversely related to RMSSD (r=-0.23, p=0.001) and pNN50 (r=0.20, p=0.008) but not frequency domain measures of HRV (p>0.05). Overweight/obesechildren demonstrated lower HF power compared to normal weight children (p=0.02). RMSSD and pNN50 were significantly lower in overweight/obesechildren compared to normal weight children (p<0.05). Age was associated with changes in Mean R-R and RMSSD (p<0.05). CONCLUSION: This exploratory study suggests that HRV is reduced in overweight/obesechildren.
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