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High-Intensity Intermittent Exercise and its Effects on Heart Rate Variability and Subsequent Strength Performance
Valéria L G Panissa1, Cesar C Cal Abad2, Ursula F Julio1
1Department of Sport, School of Physical Education and Sport, University of São Paulo São Paulo, Brazil.
Frontiers in Physiology
|March 15, 2016
Summary
High-intensity interval exercise (HIIE) temporarily impairs strength performance and alters heart rate variability (HRV) metrics like RR intervals. These changes suggest a link between HRV and reduced strength post-exercise.
Area of Science:
- Exercise Physiology
- Sports Science
- Cardiovascular Health
Background:
- High-intensity interval exercise (HIIE) is a popular training method.
- Understanding its impact on recovery and performance is crucial for athletes and coaches.
- Heart rate variability (HRV) is a sensitive indicator of autonomic nervous system function and recovery.
Purpose of the Study:
- To investigate the acute effects of a 5-km HIIE protocol on heart rate variability (HRV) and subsequent lower-body strength performance.
- To determine the time course of these effects during the recovery period.
Main Methods:
- Nine trained males completed a control session (half-squat strength exercise) and HIIE sessions followed by the same strength exercise at various recovery intervals (30 min, 1 h, 4 h, 8 h, 24 h).
- Strength performance was assessed by maximum repetitions (MNR) and total weight lifted (TWL).
- HRV was measured using beat-to-beat intervals (RR) and lnRMSSD before each session.
Main Results:
- Strength performance significantly decreased at 30 min (31%) and 1 h (19%) post-HIIE.
- Lower RR intervals were observed at 30 min and 1 h post-HIIE compared to the control condition.
- While no significant effect on lnRMSSD was found, moderate to large effect sizes indicated lower values at 30 min and 1 h post-HIIE.
Conclusions:
- Reduced strength performance after HIIE appears to be associated with alterations in HRV, specifically lower RR intervals.
- Further research is needed to fully elucidate the relationship between HRV parameters and strength recovery post-intense exercise.
Keywords:
concurrent trainingmaximum number of repetitionsmuscle strengthparasympathetic reactivationrecovery intervalMore Related Videos
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