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Relationships Between Performance in the Frequency Speed Kick Test, Heart Rate Variability, and Body Composition in
Antonio B De Andrade Junior1, Elena M P R De Andrade2, Patrícia Dos Santos Vigário1
1Rehabilitation Sciences Postgraduate Program, Augusto Motta University Center (UNISUAM), Rio de Janeiro, Brazil.
International Journal of Exercise Science
|June 9, 2025
Summary
Heart rate variability (HRV) and body composition impact Muay Thai fighter performance. Higher fat-free mass and sympathetic activation correlate with better performance and fatigue resistance, highlighting HRV
Area of Science:
- Sports Science
- Exercise Physiology
- Autonomic Neuroscience
Background:
- Heart rate variability (HRV) is a potential biomarker for injury risk and fatigue in athletes.
- The Frequency Speed of Kick Test (FSKT) measures kick speed in Muay Thai, but its relationship with autonomic function and body composition is unclear.
- Understanding these relationships is crucial for optimizing athletic performance and recovery in Muay Thai fighters.
Purpose of the Study:
- To investigate the correlations between FSKT performance, HRV parameters, and body composition in amateur Muay Thai fighters.
- To determine if fitness, reflected in FSKT and body composition, influences autonomic nervous system (ANS) function.
- To assess the acute effects of FSKT on autonomic modulation.
Main Methods:
- Cross-sectional study involving 37 amateur Muay Thai fighters.
- FSKT (including FSKT-10s and multiple FSKT for Kick Fatigue Index - KFI) and heart rate monitoring for HRV assessment.
- Body composition analysis using bioelectrical impedance analysis.
Main Results:
- FSKT-10s induced acute autonomic changes: decreased parasympathetic nervous system (PNS) index (pNN50, approximate entropy) and increased sympathetic nervous system (SNS) index.
- Higher fat-free mass (FFM) correlated positively with FSKT-10s kick count and low-frequency (LF) HRV.
- Kick Fatigue Index (KFI) negatively correlated with FFM and PNS index, and positively with LF and SNS index.
Conclusions:
- FSKT-10s acutely impacts autonomic modulation in Muay Thai fighters, increasing sympathetic activation and reducing parasympathetic activity.
- FFM and sympathetic activation are linked to performance and fatigue susceptibility in this population.
- Regular HRV assessment is recommended for Muay Thai fighters to enhance performance and training strategies.
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