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Heart Rate Variability: The Key to Understanding Performance Fluctuations
Heart rate variability (HRV) can show significant changes between high-performance days and low-performance days, with variations ranging from 120-150 on optimal days to as low as 35 on detrimental days, potentially influenced by factors like alcohol consumption. Consistent HRV measurements during races indicate a steady performance range, averaging between 80 to 110. Additionally, resting heart rate reflects personal fitness levels, with an individual's lowest recorded resting heart rate being as low as 37 and average night rates around 42-43, though variations can occur due to sickness or fatigue. Historical comparisons of maximum heart rates reveal a notable decrease over time, from 213 during junior competitions to lower rates currently.