Date of Award


Document Type

Scholarly Project

Degree Name

Doctor of Physical Therapy (DPT)


Physical Therapy

First Advisor

Thomas Mohr


Background and Purpose: The purpose of this study was to see if there is a difference in the electromyographic (EMG) activity in the hip abductor muscles (right gluteus medius) with regard to knee valgus in free standing vertical jump and landing. Both male and female participants were analyzed.

Methods: Six subjects (2 male, 4 female) in good physical condition with no previous knee pathologies participated in the experiment. EMG activity was recorded using a Noraxon TeleMyo DTS telemetry unit with a sampling rate of 1 kHz. The EMG data for the gluteus medius muscle activity and knee valgus was recorded during the three jumps which participants took off with both legs and landed on the right leg at a distance of 30% of their height. The subject was also captured on video a NiNox 125/250 camera system. The video camera was synced to the EMG data collection. The muscle tested was the right gluteus medius muscle on all subjects.

Results: The results of this study showed that Gluteus Medius activation was greater in males compared to females, however there was only a small difference between the mean and maximum knee valgus values between males and females. Males demonstrated a greater range of knee valgus between participants when compared to females. Overall there was no apparent VI relationship between the amount of knee valgus and the %MVC of hip abductors between subjects.