Journal
JOURNAL OF APPLIED BIOMECHANICS
Volume 31, Issue 6, Pages 484-491Publisher
HUMAN KINETICS PUBL INC
DOI: 10.1123/jab.2014-0177
Keywords
biomechanics; isometric; MRI; muscle volume; strength
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Funding
- Rehabilitation Research and Development Service of the Department of Veterans Affairs [A3741R]
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Our purpose was to characterize shoulder muscle volume and isometric moment, as well as their relationship, for healthy middle-aged adults. Muscle volume and maximum isometric joint moment were assessed for 6 functional muscle groups of the shoulder, elbow, and wrist in 10 middle-aged adults (46-60 y, 5M, 5F). Compared with young adults, shoulder abductors composed a smaller percentage of total muscle volume (P = .0009) and there was a reduction in shoulder adductor strength relative to elbow flexors (P = .012). We observed a consistent ordering of moment-generating capacity among functional groups across subjects. Although total muscle volume spanned a 2.3-fold range, muscle volume was distributed among functional groups in a consistent manner across subjects. On average, 72% of the variation in joint moment could be explained by the corresponding functional group muscle volume. These data are useful for improved modeling of upper limb musculoskeletal performance in middle-aged subjects, and may improve computational predictions of function for this group.
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