Quadriceps Muscle Activation of Division One Swimmers while Performing the LESS Jump

Faculty Sponsor

Dr. Kelly Helm


Arts and Sciences


Department of Kinesiology, Exercise Science

ORCID Identifier(s)


Presentation Type

Poster Presentation

Symposium Date

Spring 5-3-2018


The purpose of this study was to observe the left and right quadriceps muscle activation while DI swimmers performed the Landing Error Scoring System (LESS) jump. The null hypotheses stated that no differences would be found between the left and right quadriceps muscles and no differences would be found in quadriceps muscle activation between male and female swimmers. Seventeen participants completed the study (F=10; M=7). Surface EMG (sEMG) sensors were placed on the rectus femoris, vastus lateralis, and vastus medalis. Muscle activity was recorded with the Delsys Trigno ™ Wireless EMG System. Data was analyzed by EMG works® analysis software. Root mean square (RMS) values of sEMG signals were normalized to the highest RMS values across all three trials. Paired t-tests found no significant differences in right and left quadriceps muscle activations and no significant differences were found between male and female swimmer quadriceps muscle activation while performing the LESS. Therefore, the null hypotheses are accepted.

Biographical Information about Author(s)

Karen Holmquist is an exercise science major with human biology and psychology minors. She is interested in studying biomechanics to prevent injury. Karen plans to pursue a career in physical therapy and earn her certification in exercise physiology.

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