Award Date


Degree Type


Degree Name

Doctor of Philosophy (PhD)


Kinesiology and Nutrition Sciences

First Committee Member

Julia Freedman Silvernail

Second Committee Member

John Mercer

Third Committee Member

Richard Tandy

Fourth Committee Member

Jefferson Kinney

Number of Pages



PURPOSE: 1) To determine the relationship between gait mechanics and physical activity after anterior cruciate ligament reconstruction. 2) To explore the relationships between methods of physical activity measurement, gait mechanics, and knee functional questionnaires. METHODS: Individuals were separated into two groups based on history of unilateral anterior cruciate ligament reconstruction (ACLR): ACLR (n=13; 6 M, 7 F; 37±12 years), a minimum of one year following surgery and healthy controls with no history of ACL injury or surgery CON (n=16; 7 M, 9 F; 31±11 years). Participants were asked to complete questionnaires on their physical activity level and knee function. Then three-dimensional kinetics and kinematics were collected at preferred (ACLR: 1.18 m/s; CON: 1.32 m/s) and controlled (1.35 m/s ±5%) speeds. Finally, participants wore an activity monitor for one week. For study 1: Simple linear regression analyses were conducted to determine if objectively measured weekly volume of moderate-to-vigorous physical activity predicted peak knee flexion angle, peak knee extension moment, and peak knee abduction moment during walking in individuals with and without a history of anterior cruciate ligament reconstruction. For study 2: Pearson product-moment correlations were conducted to determine the relationships between physical activity measurement type, knee mechanics, and subjective knee function questionnaires. RESULTS: Study 1: Weekly volume of moderate-to-vigorous physical activity statistically significantly predicted peak knee flexion angle at preferred and controlled speeds and peak knee extension moment at a preferred speed in individuals with history of anterior cruciate ligament reconstruction (p < .05). Study 2: Weekly volume of moderate to-vigorous physical activity measured by seven days of Fitbit wear was negatively correlated with knee flexion angle (p


activity monitoring; kinematics; kinetics


Biomechanics | Kinesiology | Medicine and Health Sciences

File Format


File Size

796 KB

Degree Grantor

University of Nevada, Las Vegas




IN COPYRIGHT. For more information about this rights statement, please visit

Available for download on Wednesday, August 15, 2029