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Angie Selseth, Marilyn Dayton, Mitchell L. Cordova, Christopher D. Ingersoll and Mark A. Merrick


To analyze vastus medialis obliquus (VMO) and vastus lateralis (VL) muscle activity during the concentric and eccentric phases of a lateral step-up exercise.


Repeated-measures. Dependent variable: the integrated electromyogram measured as a percentage of the maximal voluntary isometric contraction of the VMO and VL muscles. Independent variable: muscle contraction with 2 levels (concentric and eccentric).


Twenty-three volunteers with no previous history of knee surgery or anterior knee pain.


Surface electrodes were positioned over the VMO and VL, and electromyographic data were collected during the exercise.


The 2 muscle phases of contraction were different when both dependent variables were considered simultaneously (F 2,7 = 33.2, P < .001). Concentric contractions produced greater muscle activity for VL (P < .05) and VMO (P < .05).


Because concentric contractions produce greater activity than eccentric contractions do during the lateral step-up exercise, they provide a stronger stimulus for muscle activation, which might result in greater muscle strength gains.

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George J. Salem, Sean P. Flanagan, Man-Ying Wang, Joo-Eun Song, Stanley P. Azen and Gail A. Greendale

Stepping activities when wearing a weighted vest may enhance physical function in older persons. Using 3 weighted-vest resistance dosages, this study characterized the lower-extremity joint biomechanics associated with stepping activities in elders. Twenty healthy community-dwelling older adults, ages 74.5 ± 4.5 yrs, performed 3 trials of forward step-up and lateral step-up exercises while wearing a weighted vest which added 0% body weight (BW), 5% BW, or 10% BW. They performed these activities on a force platform while instrumented for biomechanical analysis. Repeated-measures ANOVA was used to evaluate the differences in ankle, knee, and hip maximum joint angles, peak net joint moments, joint powers, and impulses among both steping activities and the 3 loading conditions. Findings indicated that the 5% BW vest increased the kinetic output associated with the exercise activities at all three lower-extremity joints. These increases ranged from 5.9% for peak hip power to 12.5% for knee extensor impulse. The application of an additional 5% BW resistance did not affect peak joint moments or powers, but it did increase the joint impulses by 4–11%. Comparisons between exercise activities, across the 3 loading conditions, indicated that forward stepping preferentially targeted the hip extensors while lateral stepping targeted the plantar flexors; both activities equally targeted the knee extensors. Weighted-vest loads of 5% and 10% BW substantially increased the mechanical demand on the knee extensors, hip extensors (forward stepping), and ankle plantar flexors (lateral stepping).

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116 10.1123/jsr.9.2.104 Research Test–Retest Reliability of the Standing Heel-Rise Test Michael D. Ross * Elizabeth G. Fontenot * 5 2000 9 2 117 123 10.1123/jsr.9.2.117 Quadriceps Concentric EMG Activity Is Greater than Eccentric EMG Activity during the Lateral Step-Up Exercise Angie Selseth

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Ashley A. Herda, Brianna D. McKay, Trent J. Herda, Pablo B. Costa, Jeffrey R. Stout and Joel T. Cramer

 al., 2016 ). For example, the dumbbell step-up exercise and the dumbbell bent-over row exercise mimic real-life movements ( Sayer et al., 2006 ). These movements also require adequate handgrip strength to hold the weight (WT), which further translates to opening jars, pulling doorknobs, or grasping

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Gabriel Andrade Paz, Marianna de Freitas Maia, Haroldo Gualter Santana, Humberto Miranda, Vicente Lima and John D. Willson

.1249/MSS.0b013e3181dc99b1 20305577 29. Kozanek M , Hosseini A , de Velde SK , et al . Kinematic evaluation of the step-up exercise in anterior cruciate ligament deficiency . Clin Biomech . 2011 ; 26 ( 9 ): 950 – 954 . doi:10.1016/j.clinbiomech.2011.05.003 10.1016/j.clinbiomech.2011.05.003 30

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Michelle A. Sandrey, Yu-Jen Chang and Jean L. McCrory

gluteus medius activation during gait and the lateral step up exercise . Gait Posture . 2004 ; 19 ( 2 ): 148 – 153 . PubMed ID: 15013503 doi: 10.1016/S0966-6362(03)00055-9 15013503 31. Clansey AC , Hanlon M , Wallace ES , Lake MJ . Effects of fatigue on running mechanics associated with

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Annika Kruse, Christian Schranz, Martin Svehlik and Markus Tilp

lower limb exercises ( 30 ) in sets with 10–12 repetitions organized in 3 circuits: sit-to-stand exercise, heel raises, forward lunges, lateral step-up exercise, and bridging exercise. Exercises were conducted in a controlled manner, with a slow to moderate speed, and a 2-minute break between sets

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Thomas Haugen, Gøran Paulsen, Stephen Seiler and Øyvind Sandbakk

.1.5 52. Simenz CJ , Garceau LR , Lutsch BN , Suchomel TJ , Ebben WP . Electromyographical analysis of lower extremity muscle activation during variations of the loaded step-up exercise . J Strength Cond Res . 2012 ; 26 : 3398 – 3405 . PubMed ID: 22237139 doi:10.1519/JSC.0b013e3182472fad