Acute cardiovascular responses to interval exercise: A systematic review and meta-analysis
Kym Joanne Price1, Brett Ashley Gordon2, Stephen Richard Bird1
1School of Health and Biomedical Sciences, RMIT University, Melbourne, Victoria, Australia.
Journal of Sports Sciences
|March 11, 2020
Summary
Interval exercise training shows similar cardiovascular risk to continuous exercise. This review found no significant differences in systolic blood pressure responses, suggesting interval training is a safe alternative for improving fitness.
Area of Science:
- Cardiovascular Physiology
- Exercise Science
- Sports Medicine
Background:
- Interval exercise training is increasingly recommended for health and fitness improvements.
- The cardiovascular risk associated with interval exercise compared to continuous exercise remains unclear.
Purpose of the Study:
- To systematically review and meta-analyze the effects of a single bout of interval exercise on cardiovascular risk markers.
- To compare these cardiovascular responses to those observed with continuous exercise protocols.
Main Methods:
- Systematic review and meta-analysis of studies from Medline, CINAHL, Embase, Scopus, and Cochrane databases.
- Inclusion criteria: interval exercise with defined intensity/duration and recovery, reporting blood pressure, heart rate variability, or arterial stiffness/function.
- Assessment of bias using the Cochrane Risk of Bias tool and the GRADE approach.
Main Results:
- No significant difference in systolic blood pressure responses between interval and continuous exercise immediately post-exercise or at 60 minutes.
- Interval exercise demonstrated reductions in diastolic blood pressure and improved flow-mediated dilation 10-15 minutes post-exercise.
- The available evidence suggests interval exercise does not pose a higher cardiovascular risk than continuous exercise.
Conclusions:
- Interval exercise training appears to be as safe as continuous exercise regarding immediate cardiovascular risk markers.
- Further research is needed to confirm the safety of interval exercise for individuals with clinical cardiovascular conditions.
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