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Muscle Strength, Motor Units, and Aging

Kaya, Ryan D.
http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1365769270

Abstract Details

2013, Master of Science (MS), Ohio University, Exercise Physiology-Research (Health Sciences and Professions).
Introduction: The interrelationship between muscle strength, motor units, and aging is not well known. Methods: This investigation utilized the motor unit number index technique (MUNIX) to elucidate this relationship. Beforehand, an experiment was conducted to assess the absolute and relative reliability of the MUNIX technique. Statistical Analysis: The test-retest reliability of the technique was assessed by measures of relative reliability (coefficient of variation) and absolute reliability (limits of agreement and intraclass correlation). The interrelationship between muscle strength, motor units, and aging was determined by an analysis of covariance (ANCOVA) that tested heterogeneity of regression slopes (moderation analysis). Results: The test-retest analysis yielded moderate relative reliability and moderately-high absolute reliability. A positive linear relationship was found between MUNIX and strength in the elderly, but not in the young adults. Discussion: MUNIX is a reliable measure of motor unit number in a laboratory setting. Muscle weakness in the elderly appears to be, in part, moderated by the loss of functional motor units.
Sharon Rana, PhD (Advisor)
94 p.
Biomedical Research; Neurosciences; Physiology
MUNIX; MUSIX; EMG; Elderly; Neuron

Recommended Citations

Citations

  • Kaya, R. D. (2013). Muscle Strength, Motor Units, and Aging [Master's thesis, Ohio University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1365769270

    APA Style (7th edition)

  • Kaya, Ryan. Muscle Strength, Motor Units, and Aging. 2013. Ohio University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1365769270.

    MLA Style (8th edition)

  • Kaya, Ryan. "Muscle Strength, Motor Units, and Aging." Master's thesis, Ohio University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1365769270

    Chicago Manual of Style (17th edition)

ohiou1365769270
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This open access ETD is published by Ohio University and OhioLINK.