Abstract
Limb immobilization is a commonly used therapeutic intervention during periods of recovery from injury. To improve rehabilitation outcomes, interventions that curtail the severe decrements in muscular size and strength that occur during immobilization are critically needed. The purpose of this study was to assess the effects of two distinct interventions during one week of knee-joint immobilization on muscular size, strength, and neuromuscular function. Thirty-nine healthy, college-aged adults (21 males and 18 females) participated in this study. Participants were randomized into one of four groups: immobilization only (n = 9) , immobilization + action observation/mental imagery (AOMI) (n = 10), immobilization + neuromuscular electrical stimulation (NMES) (n = 12), or a control group (n =8). The AOMI group performed daily video observation and mental imagery training of leg extensions. The NMES group performed twice daily sessions of vastus lateralis (VL) and rectus femoris (RF) stimulation at increasing intensities. Muscular size, muscular strength, and neuromuscular function were measured before and after the immobilization period. The results of multiple analyses of covariance (ANCOVAs) indicated that neither AOMI nor NMES significantly mitigated disuse-induced deficits. However, based on percent differences in outcomes between groups, AOMI may hold promise as an effective method of maintaining greater levels of strength during periods of immobilization, as ANCOVA adjusted posttest means indicated 10.7% greater MVC peak torque for the AOMI group versus the immobilization group, as well as 18.2% and 9.6% greater concentric isokinetic peak torque at 30°/s and 180°/s, respectively. Additionally, when examining within group changes, AOMI resulted in increased concentric isokinetic peak torque at 30°/s by 7.2%. Given the daily video/imagery content of the AOMI group, successful AOMI interventions are likely highly specific, and may be modulated by increased corticospinal excitability. These findings may have clinically significant implications for those undergoing periods of prescribed immobilization.
Notes
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Graduation Date
2022
Semester
Summer
Advisor
Stock, Matt
Degree
Doctor of Philosophy (Ph.D.)
College
College of Community Innovation and Education
Department
Learning Sciences and Educational Research
Degree Program
Education; Exercise Physiology
Identifier
CFE0009184; DP0026780
URL
https://purls.library.ucf.edu/go/DP0026780
Language
English
Release Date
August 2022
Length of Campus-only Access
None
Access Status
Doctoral Dissertation (Open Access)
STARS Citation
Harmon, Kylie, "The Effects of Neural and Mechanical Interventions on Muscle Size Versus Function During Short Term Immobilization of the Lower Limb" (2022). Electronic Theses and Dissertations, 2020-2023. 1213.
https://stars.library.ucf.edu/etd2020/1213