Refining the deceleration capacity index in phase-rectified signal averaging to assess physical conditioning level

Physical Conditioning Status Stratification Based on Heart Rate Variability: Principal Component Analysis of Power Spectrum Density Function

“…(2014) to detect pathological intra-QRS potentials [7]. The authors also applied PCA on HRECG signals, which enabled assessing intra-QRS potentials as markers of cardiac electrical remodeling in athletes, suggestive of myocardial hypertrophy [10].…”

“…For the analysis of the RR-interval length, artefacts and ectopic beats were excluded by correlation, precocity and visual inspection, and confirmed by one expert. The detection of the RR intervals was performed using a custom-made program written in Matlab [7].…”

Stratification of the level of aerobic fitness based on heart rate variability parameters in adult males at rest

“…However, other studies showed the opposite (Grant et al, 2013;Bosquet et al, 2007). Thus, the present study investigated another possibility of indices, based on HRV analysis, since it is already associated with physical fitness (Nasario-Junior et al, 2014;Nasario-Junior et al, 2015a). In this sense, the acceleration and deceleration indices of the RR interval series were studied (Bauer et al, 2006).…”

“…Similarly, the accelerating capacity index corresponded to the respective step obtained from the negative R-R changes. Furtherly, Nasario-Junior et al (2014;2015a) proposed a change to this method, by considering as anchor for the coherent average only the steepest change in each period of positive or negative changes of R-R time series. This approach was successful for stratifying athletes with high aerobic fitness from normal participants.…”

“…Particularly the decelerating capacity index is being useful to predict mortality after myocardial infarction (Bauer et al, 2009), to estimate physical conditioning (Nasario-Junior et al, 2014;Nasario-Junior et al, 2015a) and autonomic control status in Chagas disease patients (Nasario-Junior et al, 2015b). On the other hand, it is still unknown how these parameters relate with VO2max.…”