Title:Effect of Physical Exercise on Cardiac Autonomic Modulation in Hypertensive
Individuals: A Systematic Review and Meta-analysis
Volume: 19
Issue: 3
Author(s): Ayesha Miraj Abidi, Aqsa Mujaddadi*, Shahid Raza and Jamal Ali Moiz
Affiliation:
- Center for Physiotherapy and Rehabilitation Sciences, Jamia Millia Islamia (A Central University), New Delhi, 110025, India
Keywords:
Exercise training, cardiac autonomic function, heart rate variability, baroreflex sensitivity, heart rate recovery, hypertension.
Abstract:
Background: Cardiac autonomic dysfunction is associated with hypertension and exercise
training (ET) in healthy individuals is found to improve cardiac autonomic modulation (CAM). However,
the effects of physical exercise on CAM in hypertensive individuals are under debate.
Objective: The aim of the review is to systematically evaluate the literature on the effects of physical exercise
on CAM in hypertensive individuals and analyse comparative differences in the effects of exercise
between hypertensive and normotensive individuals.
Methods: Electronic databases, such as Pubmed, PEDro, Scopus, and Web of Science, were systematically
searched from inception up to February, 2022, evaluating the effect of ET on CAM either by heart rate
variability (HRV), baroreflex sensitivity or heart rate recovery. Fifteen studies were included in the review.
The risk of bias was assessed using the Cochrane risk of bias tool version 2 and the risk of bias in
studies of intervention (ROBINS-I) tool. The overall quality of evidence was assessed using the grading
of recommendations, assessment, development, and evaluation approach. Ten studies were included in
the quantitative analysis. The meta-analysis and sensitivity analysis were performed using review manager
5.4.1; publication bias was assessed using Jamovi 2.2.5 software.
Results: The qualitative analysis revealed low to moderate certainty of evidence for ET and moderate for
aerobic training. For the effect of overall ET, the analysis revealed that the standardized mean differences
(SMD) showed a significant effect of ET on HF (SMD 1.76, p = 0.04) and RMSSD (SMD 1.19, p <
0.0001) and a significant decrease in LF (SMD -1.78, p = 0.04). Aerobic training revealed nonsignificant
improvement in HRV parameters. In the comparative analysis, ET did not show a significant difference in
improvement between hypertensive and normotensive individuals.
Conclusion: This review suggests an improvement in CAM with physical exercise in hypertensive individuals,
but the overall effect of ET in hypertensive individuals must be interpreted with caution as the
robustness of the data is compromised in the sensitivity analysis of the trials. High-quality future trials focusing
on different modes of ET interventions are needed to strengthen the findings of the present review.