Date Available


Year of Publication


Degree Name

Master of Science (MS)

Document Type

Master's Thesis




Kinesiology and Health Promotion

First Advisor

Dr. Lance Bollinger


Flywheel resistance training (FRT) has become an increasingly popular modality for exercising due to its unique application of providing external resistance. Little is known about how changes in relative inertial loads affects performance and electromyography (EMG) activity. The purpose of this study was to examine how performance metrics and quadriceps EMG activity are affected by relative inertial load during FRT-based squats. Fifteen resistance trained individuals completed five sets of five repetitions of squats with varying relative inertial loads in random order. Peak Eccentric Power (PEP), Peak Concentric Power (PCP), average force, total work, and repetition time were measured. Surface level EMG activity of the vastus lateralis (VL), vastus medialis (VM), and rectus femoris (RF) and knee joint angle and velocity (electrogoniometers) were measured continuously. As relative inertial load is increased during FRT-based squats, we see that PEP and PCP decreased and iEMG activity increased due to a decrease in movement velocity and an increase in stimulus duration, demonstrating that peak recruitment is achieved even at very low relative inertial loads.

Digital Object Identifier (DOI)

Funding Information

UK College of Education Creative Activities Award (LB)- One Time Award 2018