How intense is high-intensity interval training? Biomarker responses and associations with training load and fitness.

Low and moderately significant correlations were defined as r < 0.29 and r > 0.3 and <0.49, respectively. 93 To assess the connection between VO 2max and biomarkers, another Pearson correlation analysis was performed where VO 2max data of T1 were used for T0, T1, T2 and 4; VO 2max data of T4 was used for T3, +1 and T4 and VO 2max data of T5 and T6 were used only for the respective time point T5 or T6.

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