Key result
Physical exercise acutely decreased the chaotic behavior of heart rate variability as measured through the Higuchi Fractal Dimension analysis compared to rest (p<0.0001).
Why the study?
Does physical exercise alter nonlinear heart rate variability measured by Higuchi Fractal Dimension in healthy young men?
Observational (n=35)
Does physical exercise alter nonlinear heart rate variability measured by Higuchi Fractal Dimension in healthy young men?
p-value: p=<0.0001
Higuchi Fractal Dimension analysis is a sensitive tool for detecting acute, complex changes in heart rate variability immediately following physical exercise.
Acute exercise reduces HRV complexity by Higuchi fractal dimension; supports nonlinear metric validation but leaves clinical utility open pending larger studies.
OBJECTIVE: Nonlinear techniques to assess heart rate variability (HRV) have received much recent attention.We aimed to evaluate nonlinear HRV responses during recovery from exercise through the novel algorithm Higuchi Fractal Dimension.METHOD: We examined 35 healthy male volunteers aged between 18 and 35 years old.For the training of exercise intensity we used 60% of Vmax determined through a progressive test using the Conconi threshold.HRV was analyzed 10 minutes before and 10 minutes after exercise.We analyzed the geometric indices of HRV (SD1, a measure of short-term HRV and SD2, a measure of long-term HRV) and applied the Higuchi Fractal Dimension to RR intervals.RESULTS: During recovery from exercise the Poincaré plot indices SD1 and SD1/SD2 decreased while SD2 and SD2/SD1 increased (p<0.0001)compared to control at rest.All parameters of Higuchi Fractal Dimension analysis were lowered after exercise compared to control at rest (p<0.0001).CONCLUSION: Physical exercise acutely decreased the chaotic behavior of HRV as measured through the Higuchi Fractal Dimension analysis.Physiologically, this indicates that we detected complex changes in HRV immediately after exercise.
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Gomes et al. (2017) conducted an observational in Healthy (n=35). Physical exercise vs. Rest (10 minutes before exercise) was evaluated on Higuchi Fractal Dimension parameters of heart rate variability (p=<0.0001). Physical exercise acutely decreased the chaotic behavior of heart rate variability as measured through the Higuchi Fractal Dimension analysis compared to rest (p<0.0001).
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