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Recovery Responses to Maximal Exercise in Healthy-Weight Children and Children With Obesity
Elizabeth A Easley1, W Scott Black1, Alison L Bailey1
1a University of Kentucky.
Research Quarterly for Exercise and Sport
|December 21, 2017
Summary
Obesity in children does not significantly affect heart rate recovery (HRRec) after maximal exercise. However, oxygen consumption recovery (VO2 recovery) differs, suggesting HRRec alone is insufficient for assessing pediatric cardiorespiratory health.
Area of Science:
- Pediatric Exercise Physiology
- Cardiorespiratory Fitness Assessment
- Obesity Research
Background:
- Assessing cardiorespiratory fitness in children is crucial for identifying health risks.
- Heart rate recovery (HRRec) and oxygen consumption recovery (VO2 recovery) are key indicators of cardiovascular health post-exercise.
- Understanding how obesity impacts these recovery metrics in pediatric populations is essential for accurate health evaluations.
Purpose of the Study:
- To compare heart rate recovery (HRRec) and oxygen consumption recovery (VO2 recovery) between healthy-weight children and children with obesity.
- To investigate the relationship between obesity indicators (BMI, body fat percentage) and recovery metrics.
- To determine the utility of HRRec as a sole indicator of cardiorespiratory fitness in children.
Main Methods:
- A maximal volitional graded exercise test (GXTmax) was administered to two groups of children: healthy-weight and those with obesity.
- Body composition was assessed for all participants.
- Heart rate recovery (HRRec) and oxygen consumption recovery (VO2 recovery) were measured for 5 minutes immediately following the GXTmax.
Main Results:
- No significant differences in HRRec were observed between healthy-weight children and those with obesity, despite significant differences in body fat percentage and peak oxygen consumption (VO2 peak).
- Statistically significant differences were found in VO2 recovery between the two groups.
- HRRec showed no significant correlation with body mass index (BMI), body fat percentage (BF%), VO2 peak, or physical activity levels.
Conclusions:
- Obesity alone does not appear to significantly impair heart rate recovery (HRRec) in healthy children.
- HRRec should not be used as the sole measure of aerobic capacity or health status in children due to its lack of association with obesity indicators.
- Utilizing multiple recovery variables, such as both HRRec and VO2 recovery, offers a more comprehensive assessment of cardiorespiratory fitness in pediatric populations.
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