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dc.contributor.authorHoran, Sean A
dc.contributor.authorWeeks, Benjamin K
dc.contributor.authorArnold, Blayne JW
dc.contributor.authorKavanagh, Justin J
dc.date.accessioned2021-02-04T04:32:28Z
dc.date.available2021-02-04T04:32:28Z
dc.date.issued2020
dc.identifier.issn0195-9131
dc.identifier.doi10.1249/01.mss.0000679884.78438.e2
dc.identifier.urihttp://hdl.handle.net/10072/401675
dc.description.abstractPURPOSE: To examine the neuromotor mechanisms that underpin changes in muscles mass and function in older men with sarcopenia. METHODS: Twenty four older men (74.4 ±5.0yrs) were recruited for testing. Muscle and fat mass were determined by DXA (Norland XR-800, USA). Functional performance was assessed via isometric knee extension strength, timed-up-and-go (TUG), 5-times sit-to-stand (5TSTS), self-selected gait speed, and hand grip strength. Neuromotor function was assessed using electrical stimulation of the tibial nerve (Digitimer DS7AH, UK) and recording of EMG activity and torque during a graded plantar flexion contraction protocol. Measures included Level of Voluntary Activation (LoVA; 20%, 40%, 60% 80%, and 100% of MVC), resting and superimposed twitch (SIT), ankle torque, and EMG activity of the plantar and dorsi flexor muscles. RESULTS: Six older men were classified as sarcopenic based on DXA-derived measures of appendicular lean mass and height (<7.25kg/m2). Differences in LoVA and SIT were observed between older men and sarcopenic men at the 60% (LoVA: OM=85.5 ±5.5% SM=77.3 ±11.7%, p<0.05; SIT: OM=2.0 ±1.0% SM=3.6 ±2.8%, p<0.05) and 80% (LoVA: OM=95.8 ±2.4% SM=92.4 ±3.3%, p<0.05; SIT: OM=0.5 ±0.3% SM=1.2 ±0.8%, p<0.05) contraction intensities. Significant differences in knee extension strength were observed between older men and sarcopenic men (OM=512.2 ±125.2N SM=328.6 ±74.4N, p=0.03), however no other differences in functional performance measures were observed. CONCLUSIONS: These preliminary findings suggest that there are underlying neuromotor changes in men with sarcopenia, particularly during submaximal muscle contractions. Interestingly, men with sarcopenia were still able to maintain a similar level of functional ability compared to older healthy men. Future work will examine neuromotor characteristics in response to fatigue.
dc.languageEnglish
dc.publisherLippincott Williams & Wilkins
dc.relation.ispartofconferencenameAmerican College of Sports Medicine (ACSM) Virtual Conference
dc.relation.ispartofconferencetitleMedicine & Science in Sports & Exercise
dc.relation.ispartofdatefrom2020
dc.relation.ispartofpagefrom524
dc.relation.ispartofpageto525
dc.relation.ispartofissue7S
dc.relation.ispartofvolume52
dc.subject.fieldofresearchSports science and exercise
dc.subject.fieldofresearchMedical physiology
dc.subject.fieldofresearchClinical sciences
dc.subject.fieldofresearchcode4207
dc.subject.fieldofresearchcode3208
dc.subject.fieldofresearchcode3202
dc.subject.keywordsScience & Technology
dc.subject.keywordsLife Sciences & Biomedicine
dc.titleNeuromotor Characteristics Of Older Men With Sarcopenia
dc.typeConference output
dc.type.descriptionE3 - Conferences (Extract Paper)
dcterms.bibliographicCitationHoran, SA; Weeks, BK; Arnold, BJW; Kavanagh, JJ, Neuromotor Characteristics Of Older Men With Sarcopenia, Medicine & Science in Sports & Exercise, 2020, 52 (7S), pp. 524-525
dc.date.updated2021-02-04T04:30:41Z
gro.hasfulltextNo Full Text
gro.griffith.authorKavanagh, Justin J.
gro.griffith.authorWeeks, Benjamin K.
gro.griffith.authorHoran, Sean A.


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