Key result
A 35-minute aerobic exercise session improved autonomic cardiac control in post-CABG patients, significantly altering the LF/HF ratio at 24 hours (d=-1.3, P=0.018).
Why the study?
To investigate the acute response to aerobic exercise on autonomic cardiac control in patients undergoing coronary artery bypass grafting.
Does a single aerobic exercise session improve autonomic cardiac control in patients following coronary artery bypass grafting?
Does a single aerobic exercise session improve autonomic cardiac control in patients following coronary artery bypass grafting?
Standardized Mean Difference: -1.3
p-value: p=0.018
A single session of low-to-moderate intensity aerobic exercise acutely improves autonomic cardiac control in patients recovering from CABG.
May support acute autonomic benefits of single-session exercise post-CABG; leaves open confirmation in larger randomized trials.
OBJECTIVE: The aim of the present study was to investigate the acute response to aerobic exercise on autonomic cardiac control of patients undergoing coronary artery bypass grafting (CABG). METHODS: The study sample consisted of eight patients (age: 58.6±7.7 years; body mass index: 26.7±3.5 kg.m2) who underwent a successful CABG (no complications during surgery and/or in the following weeks). To assess heart rate variability (HRV), participants remained in a supine position with a 30-degree head elevation for 20 minutes. Electrocardiographic signal (protocol with three derivations) was collected from 600 Hz sample rate to obtain beat-to-beat intervals (R-R interval). This assessment was performed before, after one hour and after 24 hours of the exercise session. All patients underwent a 35 minutes aerobic exercise session (AES) (low-moderate intensity) on the cycle ergometer. RESULTS: Significant differences were found in the time domain, with positive changes in root mean square of successive RR interval differences (rMSSD) (ms) (parasympathetic component) (one [P=0.017] and 24 hours [P=0.007] post-session). In the frequency domain, we found a significant difference in high frequency (HF) (ms2) (parasympathetic component) (one hour [P=0.048] post-session). The low frequency (LF)/HF ratio (sympathetic and parasympathetic components with a predominance of the sympathetic component) reached statistical significance only 24 hours (P=0.018) post-session. Additionally, the largest effect size was observed only for the LF/HF ratio at one (d=-0.8) and 24 hours (d=-1.3) after one AES. CONCLUSION: The practice of (acute) aerobic exercise improved autonomic cardiac control in patients undergoing CABG.
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Gambassi et al. (2019) studied Coronary artery bypass grafting (CABG) (n=8). Aerobic exercise session vs. Baseline (before exercise) was evaluated on Heart rate variability (HRV) including rMSSD, HF, and LF/HF ratio (d=-1.3, p=0.018). A 35-minute aerobic exercise session improved autonomic cardiac control in post-CABG patients, significantly altering the LF/HF ratio at 24 hours (d=-1.3, P=0.018).
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