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The Scientific World Journal
Volume 2013, Article ID 152684, 6 pages
http://dx.doi.org/10.1155/2013/152684
Research Article

Body Composition, Muscle Strength, and Physical Function of Patients with Bethlem Myopathy and Ullrich Congenital Muscular Dystrophy

1Department of Orthopaedics, Istituto Ortopedico Rizzoli, IRCCS, 40136 Bologna, Italy
2Department of Statistical Sciences, University of Bologna, 40126 Bologna, Italy
3Medicina Generale, Istituto Ortopedico Rizzoli, IRCCS, 40136 Bologna, Italy
4Direzione Sanitaria, Istituto Ortopedico Rizzoli, IRCCS, 40136 Bologna, Italy
5Department of Public Health Sciences, University of Modena and Reggio Emilia, 41122 Modena, Italy
6Laboratory of Musculoskeletal Cell Biology, Istituto Ortopedico Rizzoli, IRCCS, 40136 Bologna, Italy

Received 24 June 2013; Accepted 14 August 2013

Academic Editors: Y. K. Hayashi, G. Onder, L. Scorrano, and H. Topaloglu

Copyright © 2013 Maria Teresa Miscione et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Objective. To determine the contributions of body mass, adiposity, and muscularity to physical function and muscle strength in adult patients with Bethlem myopathy (BM) and Ullrich congenital muscular dystrophy (UCMD). Materials and Methods. Evaluation involved one UCMD and 7 BM patients. Body composition was determined by body mass index (BMI) and dual-energy-X-ray-absorptiometry (DXA), muscle strength by dynamometry, physical function by the distance walked in 6 minutes (6MWD), forced vital capacity (FVC) by a spirometer. Results. Six participants were of normal weight and 2 overweight based on BMI; all were sarcopenic based on appendicular fat free mass index (AFFMI); and 7 were sarcopenic obese based on AFFMI and % fat mass. Average muscle strength was reduced below 50% of normal. The 6MWD was in BM patients 30% less than normal. FVC was reduced in 4 of the BM patients. Muscle strength had a good correlation with the physical function variables. Correlation between muscle strength and BMI was poor; it was very high with AFFMI. AFFMI was the best single explicator of muscle strength and physical function. Conclusion. Muscle mass determined by DXA explains most of the variability of the measures of muscle strength and physical function in patients with BM and UCMD.