{"id":{"repo_id":"ohiolink","oai_identifier":"oai:etd.ohiolink.edu:ohiou1365769270"},"canonical_url":"https://search.dev.ndltd.org/etd/ohiolink/oai:etd.ohiolink.edu:ohiou1365769270","repository":{"repo_id":"ohiolink","name":"OhioLINK","base_url":"https://etd.ohiolink.edu/acprod/odb_etd/ws/oai/oai"},"display":{"title":"Muscle Strength, Motor Units, and Aging","abstract":"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.","abstract_html":"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.","abstract_has_math":false,"creators":["Kaya, Ryan D."],"institution":"Ohio University","degree_name":"Master of Science (MS)","degree_level":"masters","degree_discipline":"Exercise Physiology-Research (Health Sciences and Professions)","degree_department":null,"school":null,"contributors":["Rana, Sharon"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2013,"date_issued":"2013-06-13","date_published":"2013-06-13","updated_at":"2026-07-24T03:37:31Z","subjects":["Neurosciences","Physiology","Biomedical Research","MUNIX","MUSIX","EMG","Elderly","Neuron"],"languages":["English"],"rights":["unrestricted","This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws."],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1365769270","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Rana, Sharon"]},{"key":"dc:creator","label":"Author","values":["Kaya, Ryan D."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2013-06-13"]},{"key":"dc:publisher","label":"Institution","values":["Ohio University / OhioLINK"]},{"key":"dc:type","label":"Dc Type","values":["Electronic Thesis or Dissertation"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Exercise Physiology-Research (Health Sciences and Professions)"]},{"key":"thesis:degree_level","label":"Degree Level","values":["masters"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master of Science (MS)"]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["Ohio University"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Neurosciences","Physiology","Biomedical Research","MUNIX","MUSIX","EMG","Elderly","Neuron"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["English"]},{"key":"dc:rights","label":"Dc Rights","values":["unrestricted","This thesis or dissertation is protected by copyright: all rights reserved. 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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."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf","p.94","861.6 KB"]},{"key":"dc:title","label":"Title","values":["Muscle Strength, Motor Units, and Aging"]}]}],"canonical_facts":{"dc:contributor":["Rana, Sharon"],"dc:creator":["Kaya, Ryan D."],"dc:date":["2013-06-13"],"dc:description":["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."],"dc:format":["application/pdf","p.94","861.6 KB"],"dc:identifier":["http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1365769270"],"dc:language":["English"],"dc:publisher":["Ohio University / OhioLINK"],"dc:rights":["unrestricted","This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws."],"dc:subject":["Neurosciences","Physiology","Biomedical Research","MUNIX","MUSIX","EMG","Elderly","Neuron"],"dc:title":["Muscle Strength, Motor Units, and Aging"],"dc:type":["Electronic Thesis or Dissertation"],"thesis:degree_discipline":["Exercise Physiology-Research (Health Sciences and Professions)"],"thesis:degree_level":["masters"],"thesis:degree_name":["Master of Science (MS)"],"thesis:institution_name":["Ohio University"]},"updated_at":"2026-07-24T03:37:31Z"}