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Heart rate and sleep time: their relationship with growth and adiposity in male infants
Insights
Higher heart rates in infants correlate with smaller fat cells and less adiposity. Longer sleep durations are linked to increased weight gain and relative weight in infants, suggesting a connection between heart rate, sleep, and growth.
Area of Science:
- Pediatrics
- Human Physiology
- Growth and Development
Background:
- Heart rate variability is a key indicator of physiological state.
- Infant growth and adiposity are influenced by metabolic and sleep patterns.
Purpose of the Study:
- To investigate the relationship between heart rate activity, sleep duration, and body composition in healthy infants.
- To correlate heart rate metrics with nutritional intake, growth parameters, and adiposity measurements.
Main Methods:
- A clinical trial involving 21 healthy 18-month-old infants.
- 24-hour heart rate monitoring.
- Correlation analysis with nutritional intake, growth parameters, and adiposity (fat cell size, skinfold thickness).
Main Results:
- Higher 24-hour and asleep heart rates were associated with smaller fat cells and reduced skinfold thickness.
- Increased relative weight in infants correlated with higher heart rates during awake periods.
- Longer sleep durations were linked to higher birth weight gain velocity and greater relative weight.
Conclusions:
- Infant heart rate activity and sleep duration are significant factors in growth and adipose tissue deposition.
- These findings highlight the interplay between cardiovascular regulation, sleep, and metabolic health during infancy.
Abstract:
In a clinical trial based on the direct relationship between heart rate activity and energy expenditure during awake and asleep states, 21 healthy 18-month-old infants had their heart rate monitored over a period of 24 h and correlated with their nutritional intake, growth parameters, and measurements of adiposity (fat cell size and skinfold thickness). Infants with higher 24-h and asleep heart rates had smaller fat cells (r = -0.50) and skinfold thickness (abdominal r = -0.70, suprailiac r = -0.80, triceps r = -0.67). Infants with higher relative weight had higher heart rates during awake periods (r = 0.60). Infants sleeping for longer periods had higher weight gain velocity from birth (r = 0.51) and higher relative weight (r = 0.54). This study demonstrates the heart rate activity and duration of sleep are related to growth and adipose tissue deposition during infancy.