Does External Compression of Skeletal Muscle Reduce Passive Muscle Elongation Stress?
【Supercategory：7. DESCENTE SPORTS SCIENCE Subcategory：7.43 Vol.43】
ABSTRACT
External compression with a support belt has been used as a means of preventing the development of disability and recurrence of muscle injury. However, the effect of external compression on passive muscle elongation stress has not been fully demonstrated. Muscle elasticity obtained by ultrasound shear wave elastography is highly reflective of the passive force generated by muscle elongation（R2 = 0.99） . To investigate the effect of external compression by a support belt on muscle elasticity and to examine whether local compression is useful in reducing the elongation stress of skeletal muscles.
Methods: The muscle elasticity of the rectus femoris （RF） muscle of 11 healthy males was measured using shear wave elastography （Aixplorer Ver.12, 10-2 MHz linear probe） under three conditions: 40 mmHg compression with a support belt, sham condition, and control condition. We set the wearing conditions to a random order. Measurements were performed in three positions: 0°, 60°, and 120°knee flexion at the neutral hip position. We set the order of knee flexion to 0°, 60°, and 120°to eliminate the effect of stretching. Muscle elasticity was measured at two points: the proximal （33% RF lengths） at the support belt wearing site and the distal （66% RF lengths） non-wearing site.
Results: The proximal muscle elasticity showed an interaction between knee angle and wearing condition and was significantly lower in the compression condition at 40mmHg pressure than in the control condition at 120°of knee flexion（137.8 ± 42.7v.s 168.5 ± 64.1 kPa, -17.8%, p = .002） . The elasticity of the sham condition at the proximal（ 120°:147.7 ± 39.0 kPa） did not differ from that of the control and 40 mmHg compression conditions at all knee angles. Distal muscle elasticity showed only the main effect of knee angle, not the main effect of wearing condition and interaction（120；Support belt:126.1 ± 53.2, Control: 146.3 ± 78.0, Sham: 128.5 ± 50.0 kPa) .
Conclusions: Compression of 40 mmHg reduced the muscle elasticity at muscle elongation by about 18% compared to the control condition. External compression by the support belt suppresses the increase in muscle stress at the wearing site due to muscle elongation.
DECENTE SPORTS SCIENCE Vol.43/The DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE
External compression with a support belt has been used as a means of preventing the development of disability and recurrence of muscle injury. However, the effect of external compression on passive muscle elongation stress has not been fully demonstrated. Muscle elasticity obtained by ultrasound shear wave elastography is highly reflective of the passive force generated by muscle elongation（R2 = 0.99） . To investigate the effect of external compression by a support belt on muscle elasticity and to examine whether local compression is useful in reducing the elongation stress of skeletal muscles.
Methods: The muscle elasticity of the rectus femoris （RF） muscle of 11 healthy males was measured using shear wave elastography （Aixplorer Ver.12, 10-2 MHz linear probe） under three conditions: 40 mmHg compression with a support belt, sham condition, and control condition. We set the wearing conditions to a random order. Measurements were performed in three positions: 0°, 60°, and 120°knee flexion at the neutral hip position. We set the order of knee flexion to 0°, 60°, and 120°to eliminate the effect of stretching. Muscle elasticity was measured at two points: the proximal （33% RF lengths） at the support belt wearing site and the distal （66% RF lengths） non-wearing site.
Results: The proximal muscle elasticity showed an interaction between knee angle and wearing condition and was significantly lower in the compression condition at 40mmHg pressure than in the control condition at 120°of knee flexion（137.8 ± 42.7v.s 168.5 ± 64.1 kPa, -17.8%, p = .002） . The elasticity of the sham condition at the proximal（ 120°:147.7 ± 39.0 kPa） did not differ from that of the control and 40 mmHg compression conditions at all knee angles. Distal muscle elasticity showed only the main effect of knee angle, not the main effect of wearing condition and interaction（120；Support belt:126.1 ± 53.2, Control: 146.3 ± 78.0, Sham: 128.5 ± 50.0 kPa) .
Conclusions: Compression of 40 mmHg reduced the muscle elasticity at muscle elongation by about 18% compared to the control condition. External compression by the support belt suppresses the increase in muscle stress at the wearing site due to muscle elongation.
DECENTE SPORTS SCIENCE Vol.43/The DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE
| Researcher | Keigo Taniguchi, Taiki Kodesho, Takuya Kato, Yu Yokoyama, Yuhei Saitoh |
|---|---|
| University or institution | Sapporo Medical University |
Keywords
compression, ultrasound elastography, muscle elasticity, mechanical stress, injury prevention