Key result
Daytime physical activity was positively associated with increased 24-hour heart rate variability, explaining approximately 7% of the inter-individual variance in SDNN.
Why the study?
Is daytime physical activity associated with increased 24-hour heart rate variability in adult patients?
Observational (n=51,128)
Yes
Is daytime physical activity associated with increased 24-hour heart rate variability in adult patients?
Effect estimate: 7% explained variance
p-value: p=<0.0001
Daytime physical activity is positively associated with increased 24-hour heart rate variability, whereas nighttime physical activity is negatively associated, highlighting the importance of daytime activity for autonomic balance.
Does not support practice change; hypothesis-generating for activity-HRV links and requires prospective trials.
This paper reports the temporal structures of the relationships between 24-hour heart rate variability (HRV) and physical activity (PA) in clinical big data of simultaneously recorded electrocardiograms (ECG) and actigraphic data in 21,682 male and 29,446 female patients (age, 20-100 yr). We found that SDNN (standard deviation of 24-hour normal-to-normal R-R interval [NN interval] of ECG) and PA during daytime, evening, and nighttime decreased with age. In regression models adjusted for the effect of age, daytime PA explained 7% of inter-individual variance in SDNN, while evening and early morning PA explained only <0.6% and nighttime PA negatively contributed to SDNN. Daytime but not nighttime PA is positively associated with increased 24-hour HRV.
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Hayano et al. (2017) conducted an observational in Patients undergoing clinical Holter monitoring (n=51,128). Daytime physical activity vs. Evening, nighttime, and early morning physical activity was evaluated on Inter-individual variance in 24-hour heart rate variability (SDNN) (7% explained variance, p=<0.0001). Daytime physical activity was positively associated with increased 24-hour heart rate variability, explaining approximately 7% of the inter-individual variance in SDNN.
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