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ISBS - Conference Proceedings Archive, 2012
Comparison of moments and shear forces of the hip and knee during step ups and single leg squats.
The purpose of this study was to evaluate muscle activity of the vastus lateralis (VL), rectus fe... more The purpose of this study was to evaluate muscle activity of the vastus lateralis (VL), rectus femoris (RF), vastus medialis (VM), biceps femoris (BF), gluteus maximus (GM), gluteus medius (GME), adductors (A), and gastrocnemius (G) during step ups (SU) and single leg squats (SLS). Subjects were 12 weight trained adults. Muscle activity was averaged by root mean square and normalized to maximum isometric contractions. Repeated measures ANOVA results revealed interaction effects (p<0.05) of lift and phase (eccentric/concentric) for VL-, RF-, VM-, GME-, and A-activity. Significant main effects (p<0.05) between lifts were observed for BF-, GM-, and G-activity while all but RF-activity had a main effect (p<0.05) for phase. The SU appears to be more ideal for activating the quadriceps while the SLS is more appropriate to activate the hamstrings and gluteals.
The purpose of this study was to evaluate moments and shear forces at the hip and knee during ste... more The purpose of this study was to evaluate moments and shear forces at the hip and knee during step ups and single leg squats. Subjects were 12 weight trained adults. Each subject performed 3 repetitions of step ups and single leg squats using 70% of 1 repetition maximum. 2 X 2 (lift X phase (eccentric/concentric)) repeated measures ANOVAs were performed for each dependent variable. Significant interaction effects (p<0.05) were observed for knee shear force, hip shear force, and hip moment. Main effects (p<0.05) for both lift and phase were observed for knee moment. The single leg squat produced greater hip and knee moments with less absolute weight. The single leg squat may be a better exercise for healthy individuals, but may be problematic for those with a hip or knee dysfunction.
ISBS - Conference Proceedings Archive, Aug 29, 2013
The purpose of this study was to evaluate muscle activity of the vastus lateralis (VL), rectus fe... more The purpose of this study was to evaluate muscle activity of the vastus lateralis (VL), rectus femoris (RF), vastus medialis (VM), biceps femoris (BF), gluteus maximus (GM), gluteus medius (GME), adductors (A), and gastrocnemius (G) during step ups (SU) and single leg squats (SLS). Subjects were 12 weight trained adults. Muscle activity was averaged by root mean square and normalized to maximum isometric contractions. Repeated measures ANOVA results revealed interaction effects (p<0.05) of lift and phase (eccentric/concentric) for VL-, RF-, VM-, GME-, and A-activity. Significant main effects (p<0.05) between lifts were observed for BF-, GM-, and G-activity while all but RF-activity had a main effect (p<0.05) for phase. The SU appears to be more ideal for activating the quadriceps while the SLS is more appropriate to activate the hamstrings and gluteals.
ISBS - Conference Proceedings Archive, 2012
Comparison of moments and shear forces of the hip and knee during step ups and single leg squats.
The purpose of this study was to evaluate muscle activity of the vastus lateralis (VL), rectus fe... more The purpose of this study was to evaluate muscle activity of the vastus lateralis (VL), rectus femoris (RF), vastus medialis (VM), biceps femoris (BF), gluteus maximus (GM), gluteus medius (GME), adductors (A), and gastrocnemius (G) during step ups (SU) and single leg squats (SLS). Subjects were 12 weight trained adults. Muscle activity was averaged by root mean square and normalized to maximum isometric contractions. Repeated measures ANOVA results revealed interaction effects (p<0.05) of lift and phase (eccentric/concentric) for VL-, RF-, VM-, GME-, and A-activity. Significant main effects (p<0.05) between lifts were observed for BF-, GM-, and G-activity while all but RF-activity had a main effect (p<0.05) for phase. The SU appears to be more ideal for activating the quadriceps while the SLS is more appropriate to activate the hamstrings and gluteals.
The purpose of this study was to evaluate moments and shear forces at the hip and knee during ste... more The purpose of this study was to evaluate moments and shear forces at the hip and knee during step ups and single leg squats. Subjects were 12 weight trained adults. Each subject performed 3 repetitions of step ups and single leg squats using 70% of 1 repetition maximum. 2 X 2 (lift X phase (eccentric/concentric)) repeated measures ANOVAs were performed for each dependent variable. Significant interaction effects (p<0.05) were observed for knee shear force, hip shear force, and hip moment. Main effects (p<0.05) for both lift and phase were observed for knee moment. The single leg squat produced greater hip and knee moments with less absolute weight. The single leg squat may be a better exercise for healthy individuals, but may be problematic for those with a hip or knee dysfunction.
ISBS - Conference Proceedings Archive, Aug 29, 2013
The purpose of this study was to evaluate muscle activity of the vastus lateralis (VL), rectus fe... more The purpose of this study was to evaluate muscle activity of the vastus lateralis (VL), rectus femoris (RF), vastus medialis (VM), biceps femoris (BF), gluteus maximus (GM), gluteus medius (GME), adductors (A), and gastrocnemius (G) during step ups (SU) and single leg squats (SLS). Subjects were 12 weight trained adults. Muscle activity was averaged by root mean square and normalized to maximum isometric contractions. Repeated measures ANOVA results revealed interaction effects (p<0.05) of lift and phase (eccentric/concentric) for VL-, RF-, VM-, GME-, and A-activity. Significant main effects (p<0.05) between lifts were observed for BF-, GM-, and G-activity while all but RF-activity had a main effect (p<0.05) for phase. The SU appears to be more ideal for activating the quadriceps while the SLS is more appropriate to activate the hamstrings and gluteals.