PHYS THER
Vol. 78, No. 6, June 1998, pp. 611-612
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Invited Commentary

Paul F Beattie

PF Beattie, PhD, PT, OCS, Department of Orthopaedics, Division of Sports Medicine, University of Rochester, 2180 S Clinton Ave, Rochester, NY 14618

This excerpt was created in the absence of an abstract.

In this study, the authors selected a subset of individuals from the Finnish twin cohort and described a fascinating, innovative approach to investigating muscle morphology and its relationship to several factors. The use of axial (transverse) view lumbar magnetic resonance images (MRIs) provided a high-resolution, in vivo representation of lumbar muscle cross-sectional area (CSA). The authors report that genetic and environmental factors had a much stronger association with lumbar muscle CSA than factors related to physical activity did.

These findings are quite thought-provoking, although there are some limitations with this descriptive design. Classifying twins as "discordant" is a challenging task involving multiple variables. In this study, the classification appears to be based on the judgment of the examiners rather than the use of specific numeric cutoff points. As the authors point out, twins often choose similar lifestyles....


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Determinants of Paraspinal Muscle Cross-sectional Area in Male Monozygotic Twins
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Physical Therapy 1998 78: 602-610. [Abstract] [PDF]

Author Response
Laura E Gibbons, Tapio Videman, Michele Crites Battié, and Jaakko Kaprio
Physical Therapy 1998 78: 612. [Abstract] [PDF]