OBJECTIVE: To determine if task performance and fatiguability during repeated low-level contractions of an intrinsic hand muscle differ in a group of MS subjects compared with a control group, and what central changes accompany the development of fatigue and the period of recovery, whether these measures are related to subjective ratings of fatigue or perception of effort. METHODS: Force of index finger abduction, rating of perceived effort, and motor evoked potential amplitude and silent period duration were measured during and after a 20-min. intermittent submaximal (40%) contraction of the first dorsal interosseous muscle in 23 clinically definite MS subjects with mild-moderate symptoms, and 15 controls. RESULTS: Rating of perceived effort increased at a greater rate in the MS group than in control subjects during exercise, and this was associated with larger increases in both MEP amplitude and silent period duration. CONCLUSIONS: Submaximal fatiguing exercise is associated with an enhanced central motor drive and increased perception of effort in MS. SIGNIFICANCE: MS subjects can increase central drive during fatiguing exercise to a greater degree than controls, but this is associated with greater perceived exertion. These factors may underlie the more general complaint of fatigue experienced by people with MS.
OBJECTIVE: To determine if task performance and fatiguability during repeated low-level contractions of an intrinsic hand muscle differ in a group of MS subjects compared with a control group, and what central changes accompany the development of fatigue and the period of recovery, whether these measures are related to subjective ratings of fatigue or perception of effort. METHODS: Force of index finger abduction, rating of perceived effort, and motor evoked potential amplitude and silent period duration were measured during and after a 20-min. intermittent submaximal (40%) contraction of the first dorsal interosseous muscle in 23 clinically definite MS subjects with mild-moderate symptoms, and 15 controls. RESULTS: Rating of perceived effort increased at a greater rate in the MS group than in control subjects during exercise, and this was associated with larger increases in both MEP amplitude and silent period duration. CONCLUSIONS: Submaximal fatiguing exercise is associated with an enhanced central motor drive and increased perception of effort in MS. SIGNIFICANCE: MS subjects can increase central drive during fatiguing exercise to a greater degree than controls, but this is associated with greater perceived exertion. These factors may underlie the more general complaint of fatigue experienced by people with MS.
Authors: Gary W Thickbroom; Michelle L Byrnes; Sarah A Archer; Allan G Kermode; Frank L Mastaglia Journal: J Neurol Date: 2005-03-06 Impact factor: 4.849
Authors: Franca Tecchio; Andrea Cancelli; Carlo Cottone; Giancarlo Zito; Patrizio Pasqualetti; Anna Ghazaryan; Paolo Maria Rossini; Maria Maddalena Filippi Journal: J Neurol Date: 2014-05-23 Impact factor: 4.849
Authors: G Mochizuki; T Hoque; R Mraz; B J Macintosh; S J Graham; S E Black; W R Staines; W E McIlroy Journal: Brain Res Date: 2009-09-10 Impact factor: 3.252
Authors: José Mira; Thomas Lapole; Robin Souron; Laurent Messonnier; Guillaume Y Millet; Thomas Rupp Journal: Eur J Appl Physiol Date: 2017-07-07 Impact factor: 3.078
Authors: Franca Tecchio; A Cancelli; C Cottone; L Tomasevic; B Devigus; G Zito; Matilde Ercolani; F Carducci Journal: Front Hum Neurosci Date: 2013-04-22 Impact factor: 3.169