The change in autonomic control was relatively short-lived, and parasympathetic-related indices had returned to baseline 2 days after the event. Specifically, parasympathetic activity is suppressed. The results indicate that cardiac autonomic control is significantly altered in response to a 64 km ultra-marathon. Perceptual fatigue and muscle soreness increased post-race (immediately following and on day 1 of recovery) ( p < 0.05) and took until day 5 of recovery to return to baseline.
Indices of HRV had returned to baseline on day 2 of recovery. ResultsĪn increase in heart rate accompanied by decreased LnSDNN, LnRMSSD, LnLF, LnHF, and LnLF/HF from baseline were observed 1 day post-race ( p < 0.05). Profile of mood states, wellbeing, and muscular soreness were also measured throughout the study period to further contextualise recovery. Recreationally trained runners ( n = 13 (8M) age = 36.6 ± 7.6 years height = 174 ± 9 cm weight = 70.5 ± 9.3 kg) completed measures of HRV upon waking in the morning for 1 week prior to and 1 week following a 64-km running race. In addition, we aimed to determine the magnitude of change and subsequent recovery for 7 days following the race. The aim of this study was to investigate the effect of an ultra-marathon on heart rate variability (HRV) and psychometric indices in endurance runners.
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