dc.contributor.author | Horan, Sean A | |
dc.contributor.author | Weeks, Benjamin K | |
dc.contributor.author | Arnold, Blayne JW | |
dc.contributor.author | Kavanagh, Justin J | |
dc.date.accessioned | 2021-02-04T04:32:28Z | |
dc.date.available | 2021-02-04T04:32:28Z | |
dc.date.issued | 2020 | |
dc.identifier.issn | 0195-9131 | |
dc.identifier.doi | 10.1249/01.mss.0000679884.78438.e2 | |
dc.identifier.uri | http://hdl.handle.net/10072/401675 | |
dc.description.abstract | PURPOSE: 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.language | English | |
dc.publisher | Lippincott Williams & Wilkins | |
dc.relation.ispartofconferencename | American College of Sports Medicine (ACSM) Virtual Conference | |
dc.relation.ispartofconferencetitle | Medicine & Science in Sports & Exercise | |
dc.relation.ispartofdatefrom | 2020 | |
dc.relation.ispartofpagefrom | 524 | |
dc.relation.ispartofpageto | 525 | |
dc.relation.ispartofissue | 7S | |
dc.relation.ispartofvolume | 52 | |
dc.subject.fieldofresearch | Sports science and exercise | |
dc.subject.fieldofresearch | Medical physiology | |
dc.subject.fieldofresearch | Clinical sciences | |
dc.subject.fieldofresearchcode | 4207 | |
dc.subject.fieldofresearchcode | 3208 | |
dc.subject.fieldofresearchcode | 3202 | |
dc.subject.keywords | Science & Technology | |
dc.subject.keywords | Life Sciences & Biomedicine | |
dc.title | Neuromotor Characteristics Of Older Men With Sarcopenia | |
dc.type | Conference output | |
dc.type.description | E3 - Conferences (Extract Paper) | |
dcterms.bibliographicCitation | Horan, 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.updated | 2021-02-04T04:30:41Z | |
gro.hasfulltext | No Full Text | |
gro.griffith.author | Kavanagh, Justin J. | |
gro.griffith.author | Weeks, Benjamin K. | |
gro.griffith.author | Horan, Sean A. | |