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Pennation angle (θp, °) of the fibers of vastus lateralis (A) and physiological cross-sectional area (PCSA) of quadriceps in cm2 (B) assessed before (Pre) and after (Post) HIT and IRT. Lines and asterisks indicate the significant differences between the mean values (∗P < 0.05; ∗∗P < 0.01). The box extends from the 25th to 75th percentiles. The line in the middle of the box is plotted at the median and “+” at the mean. Whiskers range from a Min to Max value.
