Key result
The heart rate kinetics threshold (HRT) was highly correlated with the second heart rate deflection point (r=0.98) and respiratory compensation (r=0.90) during maximal exercise.
Why the study?
The study was conducted to identify the heart rate threshold based on heart rate kinetics during graded maximal exercise in football players.
Does the heart rate kinetics threshold (HRT) correlate with established markers of cardiorespiratory fatigue during maximal exercise in male football players?
Cross-Sectional (n=26)
Does the heart rate kinetics threshold (HRT) correlate with established markers of cardiorespiratory fatigue during maximal exercise in male football players?
Effect estimate: r = 0.98 for HRDP2; r = 0.90 for RC
The heart rate kinetics threshold is highly correlated with respiratory compensation and the second heart rate deflection point, suggesting it could serve as a practical marker for cardiorespiratory fatigue in athletes.
The main of the present study was to identify the heart rate threshold based on heart rate kinetics during graded maximal exercise in football players. Twenty-six male football players performed a maximal exercise test (Bruce protocol) on a motor-driven treadmill. Oxygen uptake (VO2) and heart rate (HR) were monitored, recorded and resampled at 3.5Hz. The ventilatory threshold (VT), and respiratory compensation (RC), heart rate deflection points (HRDP1 and HRDP2) and heart rate kinetics threshold (HRT) were determined by computerized methods. The heart rate variability (HRV) was assessed in the frequency domain. The HRT averaged 89.9 ± 1.2 % of the VO2 peak. The HRT showed poor correlations and significant differences compared with HRDP1 (r = 0.46) and VT (r = 0.51), but was not different from, and highly correlated with, HRDP2 (0.98) and RC (0.90). Bland Altman plots showed all athletes into 95% of limits of agreement, and intraclass correlation coefficient showed good agreements between points obtained from HRT compared with HRDP2 (0.96) and RC (0.98). The HRT was highly correlated with HRDP2 and RC, suggesting it could be a marker for cardiorespiratory fatigue.
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Neto et al. (2019) conducted a cross-sectional in Healthy athletes (football players) (n=26). Heart rate kinetics threshold (HRT) determination during maximal exercise vs. Other physiological thresholds (HRDP1, VT, HRDP2, RC) was evaluated on Correlation of HRT with HRDP2 and RC (r = 0.98 for HRDP2; r = 0.90 for RC). The heart rate kinetics threshold (HRT) was highly correlated with the second heart rate deflection point (r=0.98) and respiratory compensation (r=0.90) during maximal exercise.
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