Exhaustive exercise significantly reduced heart rate variability, including a 94.55% decrease in pNN50 (Hedge's g 2.91), indicating marked parasympathetic inhibition and sympathetic dominance.
Does exhaustive exercise alter autonomic nervous system activity as measured by HRV in physically fit male college students?
Exhaustive exercise significantly decreases overall heart rate variability and shifts autonomic balance toward sympathetic dominance in healthy young men.
Standardized Mean Difference: 2.91 (95% CI 1.21–3.44)
Absolute Event Rate: 1.1% vs 20.17%
p-value: p=<0.01
Introduction Exhaustive exercise is a common training method in sports, but its impact on the autonomic nervous system of the human body remains unclear. Understanding the effects of exhaustive exercise on the body and its connection with the autonomic nervous system and central nervous system is crucial for guiding healthy training methods. Methods Twenty-three participants were selected, and exhaustive exercise intervention was performed using the Bruce Protocol. By measuring heart rate variability (HRV), the effects of exhaustive exercise on the autonomic nervous system function were analyzed. Results After exhaustive exercise, time-domain indices SDNN, RMSSD, and PNN50 all significantly decreased, with changes reaching significant levels ( p 0.01). Among them, the decrease in pNN50 was particularly pronounced, with a change rate of −94.55%. Frequency-domain indices VLF, LF, and HF also showed significant decreases ( p 0.01), but the ratio of LF to HF showed an upward trend ( p 0.01), with LF showing a greater decrease. Nonlinear indices SD1 and SD2 showed extremely significant decreases ( p 0.01), and the SD2/SD1 ratio showed a significant increase ( p 0.01), indicating significant changes in HRV nonlinear characteristics after exercise. Discussion Exhaustive exercise leads to a decrease in autonomic nervous system activity and an increase in sympathetic nervous system activity. These findings underscore the profound impact of exhaustive exercise on the autonomic nervous system, with implications for understanding the physiological responses to intense physical exertion. Further research is warranted to explore the long-term effects of exhaustive exercise on autonomic regulation and its potential implications for training methodologies and athlete health.
أجرى Wang et al. (Tue,) دراسة أخرى لدى أصحاء (n=24). تم تقييم التمرين الشاق (Bruce Protocol) مقابل حالة الراحة قبل التمرين على نسبة فترات NN50 (pNN50) (Hedge's g 2.91، 95% CI 1.21-3.44، p=<0.01). أدى التمرين الشاق إلى تقليل تقلب معدل ضربات القلب بشكل ملحوظ، بما في ذلك انخفاض بنسبة 94.55% في pNN50 (Hedge's g 2.91)، مما يشير إلى تثبيط ملحوظ في الجهاز العصبي اللاودي وهيمنة الجهاز العصبي الودي.