Key result
Post-exercise HRV recovery lags behind heart rate, returning to only ~80% of baseline in older adults.
Why the study?
Heart rate recovery might not fully represent the recovery of heart rate variability-derived autonomic indices after submaximal exercise in older adults.
Do heart rate and heart rate variability-derived indices of cardiac autonomic modulation show divergent recovery patterns following submaximal exercise in healthy older adults?
Cross-Sectional (n=58)
Do heart rate and heart rate variability-derived indices of cardiac autonomic modulation show divergent recovery patterns following submaximal exercise in healthy older adults?
Absolute Event Rate: 97.3% vs 79.8%
p-value: p=<0.001
In healthy older adults, heart rate recovers more rapidly than heart rate variability indices after submaximal exercise, suggesting that heart rate recovery alone may overestimate the completeness of cardiac autonomic recovery.
Heart rate recovery may overestimate autonomic recovery after submaximal exercise in older adults; leaves open whether HRV indices better inform return-to-activity decisions.
Background Heart rate recovery (HRR) is commonly used to evaluate post-exercise recovery. However, it might not fully represent the recovery of heart rate variability-derived autonomic indices in older adults. This study examined whether heart rate and heart rate variability-derived indices of cardiac autonomic modulation show divergent recovery patterns following submaximal exercise in healthy older adults. Methods Fifty-eight community-dwelling adults aged 60–81 years completed a 5-minute submaximal step test following a 10-minute seated resting period. Heart rate (HR) and heart rate variability (HRV) parameters (RMSSD, pNN50, mean RR, SDNN, LF, HF, LF/HF ratio) were recorded during a 10-minute passive recovery period using a chest strap (Polar H10) monitor and analyzed with Kubios HRV software (version 4.0.3). Recovery dynamics were evaluated by comparing baseline values with the final 5-minute segment of the recovery phase. Results Heart rate and mean RR approached pre-exercise resting values during recovery, corresponding to 97.3% and 97.2% recovery, respectively. In contrast, RMSSD and pNN50 showed lower recovery ratios, corresponding to 79.8% and 51.1% of pre-exercise resting values, respectively. ΔHR showed a very strong association with Δ mean RR (r s = -0.932) but only moderate correlations with HRV-derived indices (ΔRMSSD: rs= -0.478; ΔHF: rs = -0.330). Recovery of HRV-derived indices was lower in the older-old group (75–81 years) and was associated with advancing age (ΔRMSSD: rs = -0.312; ΔHF: rs = -0.441). Conclusion In healthy older adults, heart rate approached pre-exercise resting values during the post-exercise recovery period, whereas several HRV-derived indices remained incompletely restored. These findings suggest that heart rate and HRV-derived indices may follow different recovery trajectories after submaximal exercise. Because autonomic function was assessed using non-invasive measures, these findings should not be interpreted as direct evidence of a causal dissociation between heart rate recovery and parasympathetic reactivation.
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A 2026 study conducted a cross-sectional in Healthy older adults (n=58). Submaximal exercise (5-minute step test) vs. Pre-exercise resting baseline was evaluated on Post-exercise recovery ratio of heart rate versus RMSSD (p=<0.001). Following submaximal exercise in healthy older adults, heart rate recovered to 97.3% of resting values, whereas the HRV index RMSSD only recovered to 79.8%, demonstrating divergent recovery patterns.
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