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.
The aim of this study was to investigate the effects of a novel combined training protocol on sleep quality and body composition of healthy elderly women. The study sample consisted of 8 sedentary elderly individuals with mean (±SD) of 67 (±8) years of age, 96.0 (±7.8) mg/dL fasting blood glucose, 94.4 (±36.1) mg/dL triglycerides, 179.1 (±22.4) mg/dL total cholesterol, 57.2 (±15.7) mg/dL high-density lipoprotein (HDL), 103.1 (±25.2) mg/dL low-density lipoprotein (LDL), 125.3 (±8.4) mmHg systolic blood pressure, and 72.6 (±10.1) mmHg diastolic blood pressure. The training protocol consisted of resistance training exercises (approximately 18-minute duration) combined with aerobic exercises (approximately 26-minute duration), performed interspersed in the same session, for 8 weeks (3 times a week), with a 24-hour interval rest between each session. Continuous variables were expressed as the mean (±standard deviation) and the paired sample t-test compares baseline with final measurement. The results showed a significant improvement (p = 0.01) in quality of sleep (4.9 ± 1.5 versus 3.8 ± 1.8 for total PSQI index) without body significant improvements in the fat-free mass (59.9 ± 4.0 versus 60.5 ± 4.4; p = 0.20) and fat mass (40.1 ± 4.0 versus 39.5 ± 4.4; p = 0.20) in healthy elderly women. In this sense, the novel combined training proposed may be an effective alternative or adjunct to present therapies aimed at improving the sleep quality in this population.
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