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

Purpose:

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

Design:

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).

Subjects:

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

Methods:

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

Results:

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).

Conclusions:

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