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Supramaximal Intensity Hypoxic Exercise and Vascular Function Assessment in Mice
Published on: March 15, 2019
Nocturnal heart rate variability following supramaximal intermittent exercise
Hani Al Haddad1, Paul B Laursen, Said Ahmaidi
1Laboratoire de Recherche, EA 3300, Faculté des Sciences du Sport, Université de Picardie Jules Verne, Amiens, France.
International Journal of Sports Physiology and Performance
|December 24, 2009
Summary
Supramaximal intermittent exercise significantly impacts cardiac autonomic activity, as measured by heart rate variability (HRV). Recovery of vagal-related HRV indices occurs within 36 hours post-exercise, indicating training efficiency.
Area of Science:
- Exercise Physiology
- Autonomic Nervous System Function
- Cardiorespiratory Fitness
Background:
- Heart rate variability (HRV) is a key indicator of cardiac autonomic activity.
- Supramaximal exercise, characterized by high intensity, is known to influence physiological recovery.
- Understanding the long-term effects of intense exercise on autonomic function is crucial for optimizing training protocols.
Purpose of the Study:
- To evaluate the impact of supramaximal intermittent exercise on cardiac autonomic activity over an extended period.
- To infer changes in autonomic function through heart rate variability (HRV) measurements.
- To assess the recovery trajectory of HRV following high-intensity exercise.
Main Methods:
- Healthy males underwent intermittent running at 95% of their 30-15 Intermittent Fitness Test (VIFT) speed until exhaustion.
- Beat-to-beat intervals were recorded nightly for three consecutive nights, with measurements taken before, immediately after, and 12 and 36 hours post-exercise.
- Heart rate variability indices were calculated during resting, recovery, and slow-wave sleep periods.
Main Results:
- Immediate post-exercise vagal-related HRV indices were significantly reduced compared to pre-exercise levels.
- Vagal indices remained lower on the second night post-exercise but showed a significant increase by the third night.
- Trends indicated a potential increase in normalized high-frequency HRV and a decrease in low-frequency HRV by the third night.
Conclusions:
- Exercise intensity profoundly affects both short-term and long-term recovery of heart rate variability.
- The findings support the effectiveness of supramaximal training in improving cardiorespiratory fitness indices.
- Autonomic recovery patterns following intense exercise provide insights into training adaptations.
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