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. 2022 Jan 5;3:788108. doi: 10.3389/fspor.2021.788108

Table 6.

Correlations between the differences in physiological characteristics and parameters related to performance before and after each of the three training periods (PP1, PP2, CP), on the one hand, and the time spent in each training zone, total time spent in all three zones, and the Polarization Index, on the other.

VO2peak v2[bla] v4[bla] 1,500-m time-trial performance
r p r p r p r p
95%CI [LL–UL] 95%CI [LL–UL] 95%CI [LL–UL] 95%CI [LL–UL]
Time in Zone 1 each week −0.25 0.43 0.06 0.86 −0.41 0.16 0.66 0.01
−0.76 0.45 −0.56 0.63 −0.81 0.25 0.10 0.90
Time in Zone 2 each week 0.37 0.24 −0.07 0.83 0.53 0.06 −0.57 0.04
−0.34 0.81 −0.64 0.55 −0.10 0.86 −0.87 0.05
Time in Zone 3 each week 0.40 0.20 −0.17 0.59 0.18 0.56 −0.36 0.22
−0.31 0.82 −0.70 0.48 −0.47 0.70 −0.79 0.30
Total time in Zones 1–3 each week −0.25 0.43 0.06 0.86 −0.41 0.16 0.66 0.01
−0.76 0.45 −0.56 0.63 −0.81 0.25 0.10 0.90
Polarization Index 0.12 0.71 0.13 0.68 −0.21 0.49 0.22 0.46
−0.55 0.70 −0.51 0.68 −0.72 0.44 −0.43 0.73

1,500-m time-trial performance, performance in connection with the all-out 1,500-m trial during the incremental step test; VO2peak, peak oxygen uptake; v2[Bla], velocity associated with a blood lactate concentration of 2 mmol·L−1; v4[Bla], velocity associated with a blood lactate concentration of 4 mmol·L−1; 95%CI [LL–UL], p, significance values; r, correlation values; 95% Confidence Interval Lower Limit – Upper Limit. Significant correlations are highlighted in bold.