What question did this study set out to answer?

To determine how varying foot stance widths and barbell loads affect electromyographic activity across six major hip and knee muscles during the parallel squat.

March 1, 1999Medicine & Science in Sports & Exercise

Stance width and bar load effects on leg muscle activity during the parallel squat

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Authors

SMSteven T. McCaw DMDONALD R. MELROSE

Discussion

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Overview

Experimental study demonstrates that stance width alters hip but not thigh muscle activation in male lifters, indicating wide stances recruit gluteal and adductor muscles without isolating quadriceps.

Key Points

To determine how varying foot stance widths and barbell loads affect electromyographic activity across six major hip and knee muscles during the parallel squat.
Tested N=9 male lifters performing five nonconsecutive parallel squat repetitions across three stance widths (narrow at 75%, shoulder width at 100%, and wide at 140% shoulder width) under low (60% 1RM) and high (75% 1RM) loads.
Recorded surface electromyography at 800 Hz from the rectus femoris, vastus medialis, vastus lateralis, adductor longus, gluteus maximus, and biceps femoris while tracking descent and ascent phases with an electrogoniometer for repeated-measures ANOVA.
Quadriceps muscles (rectus femoris, vastus medialis, and vastus lateralis) exhibited a significant main effect only for barbell load, demonstrating no significant activation differences across stance widths.
Adductor longus displayed a significant stance-by-phase interaction alongside a load effect, gluteus maximus exhibited a significant load-by-stance interaction, and biceps femoris activity peaked during the ascent phase.

Cite This Study

McCaw et al. (1999) studied this question.

synapsesocial.com/papers/6a710ec235aa2c282ce2607d https://doi.org/10.1097/00005768-199903000-00012

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March 1, 1999Medicine & Science in Sports & Exercise

Stance width and bar load effects on leg muscle activity during the parallel squat

View Full Paper

Ask AI

Bookmark

Authors

SMSteven T. McCaw DMDONALD R. MELROSE

Discussion

Member takes

Overview

Key Points

To determine how varying foot stance widths and barbell loads affect electromyographic activity across six major hip and knee muscles during the parallel squat.
Tested N=9 male lifters performing five nonconsecutive parallel squat repetitions across three stance widths (narrow at 75%, shoulder width at 100%, and wide at 140% shoulder width) under low (60% 1RM) and high (75% 1RM) loads.
Recorded surface electromyography at 800 Hz from the rectus femoris, vastus medialis, vastus lateralis, adductor longus, gluteus maximus, and biceps femoris while tracking descent and ascent phases with an electrogoniometer for repeated-measures ANOVA.
Quadriceps muscles (rectus femoris, vastus medialis, and vastus lateralis) exhibited a significant main effect only for barbell load, demonstrating no significant activation differences across stance widths.
Adductor longus displayed a significant stance-by-phase interaction alongside a load effect, gluteus maximus exhibited a significant load-by-stance interaction, and biceps femoris activity peaked during the ascent phase.

Cite This Study

McCaw et al. (1999) studied this question.

synapsesocial.com/papers/6a710ec235aa2c282ce2607d https://doi.org/10.1097/00005768-199903000-00012

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