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Effects of Therapeutic Ultrasound on Joint Mobility and Collagen Fibril Arrangement in the Endomysium of Immobilized Rat Soleus Muscle
- Source :
- Ultrasound in medicine & biology. 35(2):237-244
- Publication Year :
- 2009
- Publisher :
- Elsevier BV, 2009.
-
Abstract
- This study examined effects of therapeutic ultrasound on joint mobility and collagen fibril arrangement in the endomysium of immobilized rat soleus muscle. Twenty-two male Wistar rats were divided randomly into control (n = 5) and experimental groups (n = 17). In the experimental group, bilateral ankle joints of each rat were fixed in full plantar flexion with a plaster cast over a 4-wk period. Five animals in the experimental group were immobilized throughout the 4-wk (immobilization group) period, whereas the remaining rats in the experimental group were randomly divided into the ultrasound (US, n = 6) and sham (n = 6) treatment groups. Under anesthesia, continuous ultrasonic energy (frequency, 1 MHz; intensity, 1.0 W/cm(2)) was delivered to the triceps surae muscle of the US group for 15 min per d, 6 d per wk over the 4-wk immobilization period. Ultrasonic energy was not delivered to the triceps surae muscle in sham animals; only the transducer head was moved. Ankle joint mobility on dorsiflexion in the immobilization, sham and US groups was significantly smaller than that of the control group, whereas in the US group, this parameter was significantly greater than in the immobilization and sham groups. Collagen fibril arrangement in the endomysium of the control and US groups was longitudinal to the axis of the muscle fibers; in contrast, it was circumferential in the immobilization and sham groups. Our findings revealed that joint immobilization induces decreased joint mobility and collagen fibril movement in the endomysium; furthermore, ultrasound treatment can prevent these changes. We hypothesized that therapeutic ultrasound during the immobilization process may inhibit deterioration of muscle contracture.<br />Ultrasound in Medicine & Biology, 35(2), pp.237-244; 2009
- Subjects :
- Male
Acoustics and Ultrasonics
Ultrasonic Therapy
medicine.medical_treatment
Muscle Fibers, Skeletal
Biophysics
Hindlimb
Random Allocation
Immobilization
Triceps surae muscle
Collagen fibril arrangement
Ultrasound
medicine
Animals
Radiology, Nuclear Medicine and imaging
Range of Motion, Articular
Rats, Wistar
Muscle, Skeletal
Ultrasonography
Muscle contracture
Soleus muscle
Endomysium
Radiological and Ultrasound Technology
Therapeutic ultrasound
business.industry
Chemistry
Anatomy
Rats
Muscular Atrophy
medicine.anatomical_structure
Joint mobility
Joints
Ankle
business
Subjects
Details
- Language :
- English
- Volume :
- 35
- Issue :
- 2
- Database :
- OpenAIRE
- Journal :
- Ultrasound in medicine & biology
- Accession number :
- edsair.doi.dedup.....429f2f5fee72edb2875b0cd90db605ef