Key result
Obesity was associated with lower cardiorespiratory capacity at the heart rate variability threshold, with VO2 of 13.1 and 11.0 ml/kg/min in obese and morbidly obese groups vs 27.4 in non-obese.
Why the study?
Does the heart rate variability threshold (HRVt) method detect differences in cardiorespiratory capacity among non-obese, obese, and morbidly obese pre-adolescents?
Cross-Sectional (n=30)
Does the heart rate variability threshold (HRVt) method detect differences in cardiorespiratory capacity among non-obese, obese, and morbidly obese pre-adolescents?
The heart rate variability threshold is an effective alternative to ergospirometry for evaluating cardiorespiratory capacity in pre-adolescents across different BMI categories.
May support HRVt for detecting BMI-related capacity differences in pre-adolescents; leaves open prospective validation before clinical use.
BACKGROUND: The detection of anaerobic threshold (AT) by heart rate variability analysis (HRVt) may mean a new way to assess the cardiorespiratory capacity (CRC) in pre-adolescents. OBJECTIVE: To test the method of HRVt to detect AT in non-obese (NO), obese (O) and morbidly obese (MO) pre-adolescents in order to determine differences in their CRC. METHODS: Were studied 30 pre-adolescents, aged between 9 and 11 years, divided into three groups of ten pre-adolescents each: a) NO group - body mass index (BMI) between 5 and 85 percentiles of the chart of National Center for Chronic Disease Prevention and Health Promotion.; b) O group - BMI between 95 and 97 of the same chart; c) MO group - BMI with percentile over 97. All were submitted to an incremental protocol conducted on a treadmill, and the heart rate was recorded for the detection of the HRVt when the beat-to-beat variability (SD1), extracted from the RR intervals, reached the value of 3 ms. RESULTS: The mean values obtained at HRVt were higher for the NO group, which included: a) VO2 (ml/kg/min) NO = 27.4 ± 9.2; O = 13.1 ± 7.6, and MO = 11.0 ± 1.7 b) HR (bpm): NO = 156.3 ± 18.0, O = 141.7 ± 11.4 and 137.7 ± 10.4 MO; c) distance (m): NO = 1,194.9 ± 427.7, O = 503.2 ± 437.5 and MO = 399.9 ± 185.1. CONCLUSION: HRVt was effective for evaluation of CRC and could be applied as an alternative method to ergoespirometry in certain situations.
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Paschoal et al. (2011) conducted a cross-sectional in Obesity (n=30). Obesity vs. Non-obese was evaluated on Cardiorespiratory capacity (VO2, HR, and distance) at heart rate variability threshold. Obesity was associated with lower cardiorespiratory capacity at the heart rate variability threshold, with VO2 of 13.1 and 11.0 ml/kg/min in obese and morbidly obese groups vs 27.4 in non-obese.
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