Fig 1.
Mean (SD) average and peak velocity, upward phase duration, and relative time of occurrence of peak velocity in the upward phase at different percentages of 1-RM (30%–100%) of free-weight back squats.
→ indicates a significant difference (p ≤ 0.05) between this percentage and all percentages away from the sign.
Fig 2.
Mean (SD) root mean square (RMS) EMG activity for each percentage of the upward phase in vastus lateralis, vastus medialis, and rectus femoris during free-weight back squats.
→ indicates a significant difference (p ≤ 0.05) between this percentage and all percentages away from the sign. † indicates a significant difference (p ≤ 0.05) between these two percentages.
Fig 3.
Mean (SD) root mean square (RMS) EMG activity for each percentage of 1-RM during upward phase in biceps femoris, semimembranosus, and gluteus maximus during free-weight back squats.
→ indicates a significant difference (p ≤ 0.05) between this percentage and all percentages away from the sign. † indicates a significant difference (p ≤ 0.05) between these two percentages.
Fig 4.
Relative time of occurrence of maximal RMS muscle activation at different percentages of 1-RM (30%–100%) of free-weight back squats.
→ indicates a significant difference (p ≤ 0.05) between this percentage and all percentages away from the sign for this muscle. * indicates a significant difference (p ≤ 0.05) between these two muscles in order of occurrence.