HRVTHeart Rate Variability Threshold (kinesiology)
HRVTHigh Risk Victims and Trafficking (police unit)
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In S2, they performed 3 sets of 8 min in HRVT with 2 min of active recovery at 20% <HRVT, totaling 30 min.
Table 5 shows the effect size (ES) calculation for the ISWT, [], [], [], and HRVT variables in the comparison between A1 and A2.
It was observed that regardless of the way the load was distributed, the subjects significantly improved in ISWT, [] and in HRVT. However, only the UL group showed significant reduction in [] and the LL and UL showed increased [].
Hence, the main purpose of the present study was to investigate the level of agreement between GET and HRVT during maximal CPET performed within three different exercise modalities (cycling, walking, and running).
The HRVT was defined as the first work rate during the maximal CPET test in which the standard deviation for heart rate, calculated using Poincare plots (nonlinear method; Figure 1), when SD1 was less than 3 ms (17).
The effect of method (GET vs HRVT) and mode on the threshold values for heart rate, %HRR, V[O.sub.2], and %V[O.sub.2] R were also tested using marginal models.
Pearson's correlation (P<0.05) was performed to verify the interaction between the HRVT and the vagal reactivation, as measured by RMSS[D.sub.2-5min].
Table 1 shows the measures at rest, at maximal progressive aerobic exercise, and the percentage of the maximum percentage load at which the HRVT was identified.
The validity of the HRVT to estimate the AeT and AnT in homogeneous groups of athletes with very high aerobic capacities has not been examined yet.
Pearson's product-moment (r) indicated that the [AeT.sub.+0.2] correlated best with the HRVTs (r = 0.66-0.88; P<0.05).
The criteria for determining HRVT were the breaking of linearity SD1, ratio SD1/SD2 (21,20), first stage in the decrease of the curve where the difference between SD1 of two consecutive stages was lower than 1 ms (20), and the breaking of linearity HFpeak x HFms (2) (6).
In order to determine the breaking in linearity between HRVT and HRDP, a segmented package (14) and the concordance methodology of Bland-Altman (1) were used (P=0.05).