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Measuring effects of height on the autonomic nervous system in middle-aged adolescents using the very low frequency band of heart rate variability.

Previous studies have revealed the association between falling accidents and stress, measured via heart rate variability (HRV). However, none have studied this association using the very low frequency (VLF) band of HRV in adolescent populations. This study aimed to fill this gap by recruiting 90 adolescents to perform a light physical task at varying heights. Heart rates were used to calculate short-term HRV. The results showed a positive correlation between VLF bands and parasympathetic indices and a negative correlation with sympathetic indices, demonstrating the balancing effects of the autonomic modulation associated with height. The lowest VLF bands were obtained as 79.25 ms2 at 10 m (P < 0.001) and 62.87 ms2 at 9 m (P < 0.001) for the experienced and non-experienced male groups, respectively, and 28.09 ms2 at 6 m (P = 0.001) for the female group. The results also suggested the need for a relatively lower height restriction for female adolescents than for males.