Key result
Changes in cardiac vagal autonomic function during 4 weeks of basic military training correlated with changes in maximal oxygen uptake (r=0.73, P=0.001) and testosterone (r=0.43, P=0.047).
Why the study?
Are changes in cardiac autonomic function associated with changes in maximal oxygen uptake and serum hormonal concentrations during stressful military training in male conscripts?
Observational (n=22)
Are changes in cardiac autonomic function associated with changes in maximal oxygen uptake and serum hormonal concentrations during stressful military training in male conscripts?
Effect estimate: r = 0.73
p-value: p=0.001
Measurements of cardiac autonomic function via R-R interval spectral power may serve as a useful tool for indicating physiological adaptation to highly stressful conditions.
Cardiac vagal monitoring may track adaptation in stressed trainees; leaves open whether it predicts fitness or hormonal changes beyond this cohort.
The last 4 weeks of basic military training are very stressful. We tested the hypothesis that changes in cardiac autonomic function during this period are associated with changes in maximal oxygen uptake and/or serum hormonal concentrations in male conscripts ( n =22). Cardiac vagal autonomic function was assessed by measuring the high‐frequency (0.15–0.4 Hz) spectral power of R–R intervals. Maximal oxygen uptake ( [Vdot] O 2max ) and basal serum testosterone concentration were measured at the beginning and end of the period. Individual changes in vagally mediated high‐frequency power (range −15% to +25%) correlated ( r =0.73, P =0.001) with changes in [Vdot] O 2max (range −9% to +6%) and changes in testosterone concentration (range −52% to +43%; r =0.43, P =0.047). The mean values of [Vdot] O 2max and testosterone concentration did not change during the study period. Measurements of autonomic function could be a useful tool for indicating adaptation to the highly stressful conditions associated with basic military training.
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Huovinen et al. (2011) conducted an observational in Healthy volunteers (n=22). Basic military training was evaluated on Correlation between changes in vagally mediated high-frequency power and changes in maximal oxygen uptake (r = 0.73, p=0.001). Changes in cardiac vagal autonomic function during 4 weeks of basic military training correlated with changes in maximal oxygen uptake (r=0.73, P=0.001) and testosterone (r=0.43, P=0.047).
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