Prolonged trapezing during sailing often results in low back pain among elite sailors. Modifications of the trapeze harness have been proposed as one approach to ameliorating this problem. To evaluate six harnesses incorporating novel features that had tested well during pilot work, myoelectric activity was monitored at C5, T6, and L5 levels of sacrospinalis and at an abdominal site while five elite sailors wore the harnesses. Integrated EMG (IEMG) values were stored by a microcomputer at periodic intervals during each 10-min trial, as each subject maintained a static horizontal trapezing position in the laboratory. Factorial repeated-measures ANOVA indicated no change in IEMG values over time, but significant (p<0.001) differences among harnesses at all four electrode sites. Features of trapeze harness design that appear to minimize muscular tension include heavy, rigid padding throughout the harness, full-length shoulder-to-buttocks support of the trunk, and adjustable leg strap supports as opposed to a...
[1]
J. W. Yates.
Comments on Using Raw Electromyogram Signals
,
1987
.
[2]
A. Schultz,et al.
Valsalva Maneuver Biomechanics: Effects on Lumbar Trunk Loads of Elevated Intraabdominal Pressures
,
1986,
Spine.
[3]
M Gagnon,et al.
Evaluation of forces on the lumbo-sacral joint and assessment of work and energy transfers in nursing aides lifting patients.
,
1986,
Ergonomics.
[4]
F Figura,et al.
Biomechanics of two fundamental sailing postures.
,
1980,
The Journal of sports medicine and physical fitness.
[5]
M Berkson,et al.
Voluntary strengths of male adults with acute low back syndromes.
,
1977,
Clinical orthopaedics and related research.
[6]
S. Aro,et al.
Trunk muscle function and low back disorders: a ten-year follow-up study.
,
1987,
Journal of chronic diseases.