Muscle Activation and Foot Pressure of College Female Basketball Players with and Without Knee Injury: A Pilot Study

Faculty Sponsor

Kelly Helm


Arts and Sciences



ORCID Identifier(s)


Presentation Type

Poster Presentation

Symposium Date

Spring 5-3-2018


This study compared muscle activation and foot pressure of DI basketball players, with and without knee injury, while performing a standard rebound drill. The null hypothesis stated no significant differences would be found between injured and non-injured players in muscle activation and in foot pressure during a rebounding drill. The study consisted of seven subjects (injured=2,healthy=5). Six subjects were right leg dominant. Surface electrodes (sEMG) were placed on the right and left biceps femoris and medial and lateral head of gastrocnemius muscles to measure muscle activation. OrpyxLogR® inserts were placed in both shoes to detect foot pressure per square in (psi) during the jumping and landing movement of each rebound. Particpants completed five rebounds of a basketball from a Just Jump mat, which measured jump height and airtime. Mean jump height for all the participants was 14.17 in. The OrpyxLogR® software automatically sent data to cloud via Bluetooth technology and calculated psi of each of the five jumps. Muscle activation was recorded with Delsys Trigno™ Wireless EMG System and analyzed with EMGworks® software. Root mean square (RMS) values of sEMG signals were normalized to the highest RMS across all trials. Mean muscle activation scores revealed less activation in all three muscles of injured leg v non-injured leg of one subject. Independent t-test revealed no significant differences in foot pressure and muscle activation between injured and non-injured players. The null hypothesis is accepted.

Biographical Information about Author(s)

Georgi Donchetz is a senior exercise science major with a minor in human biology at Valparaiso University. Her future goal is to work as a strength and conditioning coach to help athletes reach their personal and team athletic goals.

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