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Association between muscle oxygenation dynamics and cardiac workload and ventilation during exercise
Shinji Nemoto1, Tohru Nakabo2, Akira Yoshikawa3
1Division of Physical Therapy, Department of Rehabilitation, Showa Medical University School of Nursing and Rehabilitation Sciences, Yokohama, Japan - shinji4df@nr.showa-u.ac.jp.
High muscle oxygenation dynamics during exercise reduce cardiac workload and ventilation. This finding suggests improved physiological efficiency in individuals with better muscle oxygen utilization.
Area of Science:
- Exercise Physiology
- Cardiovascular Physiology
- Respiratory Physiology
Background:
- The relationship between muscle oxygenation dynamics and physiological responses during exercise is not fully understood.
- High muscle oxygenation is hypothesized to decrease cardiac workload and ventilation.
Purpose of the Study:
- To investigate if high muscle oxygenation dynamics reduce cardiac workload and ventilation during exercise.
- To clarify the physiological benefits of efficient muscle oxygen utilization.
Main Methods:
- Cross-sectional study with 23 healthy males divided into low and high muscle oxygenation dynamics groups.
- Cardiopulmonary exercise testing to measure cardiac workload, carbon dioxide production (VCO2), and ventilation.
- Analysis using linear mixed-effect models to assess group and metabolic equivalent (MET) interactions.
Main Results:
- Significant interactions between muscle oxygenation groups and METs were observed (P<0.001).
- The high muscle oxygenation group exhibited lower double product, VCO2/body mass (5-8 METs), and expiratory minute volume/body mass (6-8 METs) compared to the low group.
Conclusions:
- High muscle oxygenation dynamics are associated with reduced cardiac workload and ventilation during exercise.
- Efficient muscle oxygen utilization may lead to improved exercise performance and reduced physiological strain.
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