Relationship between heart rate acceleration at onset of exercise and aerobic endurance performance in female student athletes
Poster Presentation XML
1Tarbiat Modares university
2Tarbiat modares university
3Isfahan University
Introduction: A variety of measures are commonly used to monitor athletes’ fitness level and track their adaptations to training. The use of autonomic regulation of heart rate (HR), as an indicator of fitness level, has shown promising results. While autonomic regulation of HR has been usually measured using heart rate recovery or heart rate variability, HR acceleration at the onset of exercise (HRonset) has recently been proposed as another practical value for monitoring athletes’ fitness level indirectly. However, it is still not clear which time point (e.g.., 4s, 30s) is more suitable for analyzing this measure. Therefore, the aim of this study was to compare the relationship between HRonset at 4s (HRonset4s) and at 10s (HRonset10s) of exercise and aerobic endurance performance in female student athletes.
Methodology: 11 active female students (Mean±SD, 17.3±0.6 years) performed the 30-15 Intermittent Fitness Test (30-15IFT) and a submaximal warm-up test interspersed by 72 hours to measure maximal endurance performance (VIFT) and HRonset, respectively. Differences between number of HR (bpm) at start and 4s as well as 10s after exercise were considered as indices of HRonset4s and HRonset30s, respectively. Pearson correlation coefficients with 90% of confidence interval (CI) were used to examine the associations. The correlation coefficient (r, 90%CL) was ranked as trivial (0<0.1), small (0.10-0.29), moderate (0.30-0.49), large (0.50-0.69), very large (0.70-0.89) and nearly perfect (0.90-0.99).
Results: VIFT showed large (r= 0.57, 90%CI [0.07; 0.84]) and very large (r= 0.71, [0.30; 0.90]) relationships with HRonset4s and HRpost30s, respectively.
Discussion: This study showed that while both short (i.e., HRpost10s) and long (i.e., HRpost30s) measures of HR acceleration at onset of exercise have positive relationships with aerobic endurance performance, relative longer indices (i.e., HRpost30s) might show stronger associations. Hence, it seems that sympathetic activity of HR autonomic regulation is more associated with aerobic endurance performance compared to parasympathetic withdrawal mechanism. Therefore, it is suggested to use HRonset30s for monitoring aerobic endurance of female athletes.