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Voluntary Muscle Activation and Exercise Recovery in Chronic Fatigue Syndrome
by Taub, Elana, M.Sc., University of Calgary (Canada), 2010, 135 pages; AAT MR69608
Abstract (Summary)
Individuals with myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) commonly experience symptom exacerbations after exercise (post-exertional malaise). Interpolated twitch analysis and electromyography were used to quantify central and peripheral fatigue in the right quadriceps femoris muscles of 9 women with ME/CFS and 9 sedentary but otherwise healthy control subjects (CON) before and after 2 incremental cycle ergometer exercise tests to exhaustion 24 hrs apart. Peak O 2 consumption, heart rate and aerobic power were the same in both groups and on both tests. Although baseline MVC was similar (ME/CFS 85.124.1 N m; CON 90.519.4 N m), MVC was significantly decreased in ME/CFS after the 2 nd test (p=0.040). Voluntary activation ratio was lower in ME/CFS than CON (81.9 vs. 93.2 %, p=0.012) but there was no group by time interaction, suggesting that central fatigue did not cause the decreased MVC. Instead, low-frequency fatigue combined with central activation failure may explain the results and may contribute to post-exertional malaise.
Indexing (document details)
School: University of Calgary (Canada)
School Location: Canada
Source: MAI 49/03, Jun 2011
Source type: Dissertation
Subjects: Health sciences, Kinesiology
Publication Number: AAT MR69608
ISBN: 9780494696088
Document URL: http://proquest.umi.com/pqdlink?did=2260545911&Fmt=7&clientI d=79356&RQT=309&VName=PQD
ProQuest document ID: 2260545911