Life Sciences Commons^™

The Relationship Between The Contact Force At The Ankle Hook And The Hamstring Muscle Force During The Nordic Hamstring Exercise, Mianfang Ruan, Li Li, Weiping Zhu, Tianchen Huang, Xie Wu

Department of Health Sciences and Kinesiology Faculty Publications

A novel device has been developed to assess eccentric hamstring strength during the Nordic hamstring exercise (NHE) by measuring the contact force at the ankle hook (brace). The purpose of this study was to determine the correlation between the force measured at the ankle hook and the hamstring force estimated by a low extremity model. Thirteen male college sprinters were recruited to perform NHE on an instrumented device Nordbord (Vald Performance, Australia). Contact forces were measured at a sampling rate of 50 Hz at the hooks using the uniaxial load cells. 3D kinematics were measured simultaneously at a sampling rate …

Campus Recreation And Fitness Center Utilization During The Covid-19 Pandemic, Keagan Kiely, William Mase, Bridget F. Melton, Haresh Rochani Dr.

Department of Health Sciences and Kinesiology Faculty Publications

Background

The impact of the COVID-19 pandemic has far reaching effects for college students' health and physical activity behaviors. This analysis focuses on university student fitness center usage pre and during the COVID-19 pandemic. Researchers hypothesized a reduction in fitness center utilization when comparing Fall 2019 to Fall 2020 utilization rates.

Methods

Patterns of the recreation center and fitness center utilization during the COVID-19 pandemic are compared to pre-pandemic patterns of a matched time period in the previous academic year in an observational study. Overall utilization was evaluated using secondary data from the university’s recreation center data system. Six weeks …

Reliability And Validity Of Three Clinical Methods To Measure Lower Extremity Muscle Power, Mattie E. Pontiff, Li Li, Noelle G. Moreau

Department of Health Sciences and Kinesiology Faculty Publications

Background: Lower extremity muscle power is critical for daily activities and athletic performance in clinical populations. Objective: The purpose of this study was to determine the reliability and validity of 3 clinically feasible methods to measure lower extremity muscle power during a leg press. Methods: Ten of 26 subjects performed 2 sessions of 5 submaximal leg presses separated by 3-7 days in this repeated-measures cross-sectional design; the remaining performed 1 test session. Power was calculated independently for each method [simple video, linear position transducer, and accelerometer] and compared to the reference force plate. Test-retest reliability was evaluated using intraclass correlation …

Ankle-Knee Initial Contact Angle And Latency To Maximum Angle Are Affected By Prolonged Run, Sydni Wilhoite, Jessica Mutchler, Barry Munkasy, Li Li

Department of Health Sciences and Kinesiology Faculty Publications

The initial contact and midstance angles may influence injury risk. Previous literature has not assessed these angles under the influence of new footwear for a non-exhaustive prolonged run or the relationship between the angles. To assess lower extremity kinematic changes and the relationship between kinematic parameters at initial contact and midstance with prolonged running under the influence of different types of footwear. Twelve experienced, recreational runners (6 male; 6 female; 24.8 ± 8.4 years; 70.5 ± 9.3 kg; 174.1 ± 9.7 cm) ran for 31 minutes at a self-selected pace for three testing sessions wearing maximalist, habitual, and minimalist shoes. …