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Full-Text Articles in Kinesiology
Sex Impact On Knee And Ankle Muscle Extensor Forces During Loaded Running, Kade D. Wagers, Nicholas J. Lobb, Auralea C. Fain, Kayla D. Seymore, Tyler N. Brown
Sex Impact On Knee And Ankle Muscle Extensor Forces During Loaded Running, Kade D. Wagers, Nicholas J. Lobb, Auralea C. Fain, Kayla D. Seymore, Tyler N. Brown
Kinesiology Faculty Publications and Presentations
Background: This study determined whether the knee and ankle muscle extensor forces increase when running with a body-borne load and whether these forces differ between the sexes. Methods: Thirty-six (twenty male and sixteen female) adults had the knee and ankle extensor force quantified when running 4.0 m/s with four body-borne loads (20, 25, 30, and 35 kg). Peak normalized (BW) and unnormalized (N) extensor muscle force, relative effort, and joint angle and angular velocity at peak muscle force for both the ankle and the knee were submitted to a mixed model ANOVA. Results: Significant load by sex interactions for knee …
Muscle Synergies During A Single-Leg Drop-Landing In Boys And Girls, Kristof Kipp, Ronald Pfeiffer, Michelle Sabick, Chad Harris, Jeanie Sutter, Seth Kuhlman, Kevin Shea
Muscle Synergies During A Single-Leg Drop-Landing In Boys And Girls, Kristof Kipp, Ronald Pfeiffer, Michelle Sabick, Chad Harris, Jeanie Sutter, Seth Kuhlman, Kevin Shea
Kinesiology Faculty Publications and Presentations
The purpose of this study was to investigate muscle activation patterns during a landing task in boys and girls through the use of muscle synergies. Electromyographical (EMG) data from six lower extremity muscles were collected from 11 boys and 16 girls while they performed single-leg drop-landings. EMG data from six leg muscles were rectified, smoothed, and normalized to maximum dynamic muscle activity during landing. Data from 100 ms before to 100 ms after touchdown were submitted to factor analyses to extract muscle synergies along with the associated activation and weighing coefficients. Boys and girls both used three muscle synergies. The …