Key result
Moderate-intensity exercise is linked to a ~57% lower standing LF/HF ratio across postures.
Why the study?
This study was conducted to examine changes in frequency-domain heart rate variability parameters and recovery towards baseline in young healthy men before and after moderate-intensity exercise across standing, sitting, and supine postures.
Does moderate-intensity cycling exercise alter frequency-domain heart rate variability parameters across standing, sitting, and supine postures in healthy young male adults?
Observational (n=25)
No
Does moderate-intensity cycling exercise alter frequency-domain heart rate variability parameters across standing, sitting, and supine postures in healthy young male adults?
Moderate-intensity exercise induces posture-dependent alterations in frequency-domain heart rate variability parameters—including a consistent reduction in the LF/HF ratio across supine, sitting, and standing positions—that persist beyond five minutes of recovery, highlighting the need to standardize body posture and recovery duration during autonomic assessments.
Moderate exercise may modulate autonomic tone in healthy young men; leaves open effects in patients or longer-term outcomes.
Introduction: Heart rate variability (HRV) is a non-invasive measure of variations in intervals between successive sinus beats, reflecting the dynamic interaction between sympathetic and parasympathetic branches of the autonomic nervous system (ANS). It is useful for assessing autonomic regulation, monitoring responses to exercise, and evaluating cardiovascular risk. Aims and Objectives: To examine changes in HRV parameters in young, healthy male adults before and after moderate-intensity exercise in standing, sitting, and supine postures, with particular emphasis on frequency-domain components and recovery towards baseline. Materials and Methods: This observational study included 25 apparently healthy young men without known metabolic or cardiovascular conditions. ECG recordings were obtained, and HRV was analysed using frequency-domain techniques in standing, sitting, and supine positions before and after moderate-intensity exercise. Post-exercise measurements were recorded following a five-minute recovery period in each posture. Results: HRV responses varied by posture. VLF power decreased in sitting and supine positions but increased in standing. LF power and VLF percentage decreased in standing and sitting, while HF power varied across positions. The LF/HF ratio decreased in all three postures, indicating altered sympathovagal balance during early recovery. Conclusion: HRV reflects cardiac autonomic regulation and exercise responses. Moderate exercise alters HRV parameters depending on body posture, with changes persisting after five minutes of recovery. These findings highlight the importance of posture and recovery duration in autonomic assessment.
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Shukla et al. (2026) conducted an observational in Healthy young male adults (n=25). Moderate-intensity cycling exercise vs. Pre-exercise baseline in supine, sitting, and standing postures was evaluated on Frequency-domain Heart Rate Variability (LF/HF ratio in standing posture) (p=<0.001). Moderate-intensity exercise significantly reduced the LF/HF ratio across supine (2.15 to 1.94, p<0.05), sitting (2.75 to 1.66, p<0.001), and standing (2.82 to 1.22, p<0.001) postures.
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