Changes in stiffness of the dorsal scapular muscles before and after computer work: a comparison between individuals with and without neck and shoulder complaints

Ishikawa, Hiroaki; Muraki, Takayuki; Morise, Shuhei; Sekiguchi, Yoshinori; Yamamoto, Nobuyuki; Itoi, Eiji; Izumi, Shin Ichi

doi:10.1007/s00421-016-3510-z

Cited by 48 publications

(62 citation statements)

References 40 publications

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“…Some evidence suggests that occupation (e.g., office computer workers, professional drivers, medical workers, etc.) and sedentary working postures (e.g., poor mouse or keyboard position) may be related to the onset of neck pain 2 – 4 . With the change of lifestyle, growing people use computers or electronic products to work and maintain sedentary sitting position for long periods, which can easily induce overstretch of neck extensor muscles.…”

Section: Introductionmentioning

confidence: 99%

Determination of reference ranges for normal upper trapezius elasticity during different shoulder abduction using shear wave elastography: a preliminary study

Wang

Xiang

Zhu

et al. 2020

Sci Rep

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The purpose of this study was to determine the reference ranges of normal upper trapezius (UT) elasticity during different shoulder abduction using shear wave elastography (SWE). Mean shear wave velocity (SWV) of UT elasticity in eighty healthy participants were measured at left and right shoulder 0° abduction and 90° passive abduction (L0°, R0°, L90°, R90°) with SWE. The effects of potential factors (gender, UT thickness, age, and body mass index) on UT elasticity were analyzed. The reference ranges of normal UT elasticity were calculated by using the normal distribution method. UT elasticity was significantly different among various shoulder abduction (P < 0.0001). UT elasticity was significantly higher in males at both L90° (P < 0.05) and R90° (P < 0.01) than in females. The reference ranges of normal UT elasticity were 2.90–4.01 m/s at L0° and 3.01–4.29 m/s at R0°, and were 4.90–6.40 m/s in males and 4.40–6.20 m/s in females at L90°, 5.20–7.02 m/s in males and 4.71–6.80 m/s in females at R90°. Our results suggest that gender should be considered when determining the reference ranges of normal UT elasticity at L90° and R90° with SWE. These values may provide quantitative baseline measurements for the assessment of UT muscle strain in the future.

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Section: Introductionmentioning

confidence: 99%

Determination of reference ranges for normal upper trapezius elasticity during different shoulder abduction using shear wave elastography: a preliminary study

Wang

Xiang

Zhu

et al. 2020

Sci Rep

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“…The upper trapezius muscle, which spans the neck and shoulder, contributes to normal cervical vertebra and scapula motion [5]. The biomechanical properties of the upper trapezius can be influenced among individuals with neck pain as evidenced by the significant increases in upper trapezius activity on electromyography (EMG) and stiffness by SWE [6–8]. Therefore, it is meaningful to evaluate the biomechanical properties of the upper trapezius to further explore its biomechanical mechanism and provide standard guidance in rehabilitation plans.…”

Section: Introductionmentioning

confidence: 99%

Modulation in Elastic Properties of Upper Trapezius with Varying Neck Angle

Zhang

Liu

et al. 2019

Applied Bionics and Biomechanics

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Background. Neck and shoulder complaints caused by poor posture may influence upper trapezius stiffness. The relationship between the shear elastic modulus of the upper trapezius and cervical flexion angles is unknown. Therefore, it is essential to assess upper trapezius stiffness during cervical flexion. The objectives of this study were to (1) determine the intra- and interoperator reliabilities of evaluating upper trapezius stiffness and calculate the minimal detectable change (MDC); (2) examine the elastic modulus alterations of the upper trapezius during cervical flexion; and (3) explore the difference of upper trapezius stiffness between the dominant and nondominant sides. Methods. Twenty healthy male participants were recruited in this study. The shear modulus of the upper trapezius was evaluated by two independent investigators using shear wave elastography (SWE) during cervical flexion at 0° and 50°. Findings. The intraoperator (intraclass correlation coefficient ICC=0.85–0.86) and interoperator (ICC=0.94–0.98) reliabilities for measuring the shear elastic modulus of the upper trapezius during the cervical flexion ranged from good to excellent. An increase of 35.58% in upper trapezius stiffness was found at 0° to 50° of cervical flexion, and the MDC was 7.04 kPa. In addition, a significant difference was obtained in the elastic modulus of the upper trapezius muscle between the dominant and nondominant sides (P<0.05). Conclusions. Our findings revealed that SWE could quantify the elastic modulus of the upper trapezius and monitor its changes. Therefore, further studies are required to delineate the modulation in upper trapezius muscle stiffness among subjects with neck and shoulder pain.

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“…Muscle stiffness or hardness, which may be simply defined as the resistance offered by muscles to compression, is a mechanical property that adapts in response to muscle use [3]. Unlike other tissues, skeletal muscle stiffness varies dynamically with muscle length changes and contraction status [4][5][6][7][8][9][10]. In addition to such transient changes, pathological modifications of the muscle tissue as a result of musculoskeletal disease, often affect its stiffness [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

“…Together with its widespread use in the clinic, US elastography has also been used to study muscle coordination within complex muscle groups during movement [18,27,28]. Ultrasound elastography is useful in this case since it allows real-time measuring of muscle stiffness in different regions of the muscles (e.g., the muscle belly on the tendon), between superficial and deep muscles, and within complex multifunctional muscle groups, like in the neck [9] or in the shoulder girdle [27,29]. For example in the shoulder, US strain elastography allows one to describe the patterns of contraction of single muscles within an anatomical complex muscle group [27,29,30].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Strength Training on Vastus Lateralis’ Stiffness: An Ultrasound Quasi-Static Elastography Study

Santos

Valamatos

Mil‐Homens

et al. 2020

IJERPH

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Ultrasound imaging allows the evaluation of musculoskeletal morphology and function. Ultrasound elastography can also offer semi-quantitative and/or quantitative assessment of tissue stiffness providing relevant information about adaptations of skeletal muscle mechanical properties. In this study we aimed to explore the feasibility of elastography ultrasound imaging in assessing the effect of strength training on vastus lateralis stiffness. Twenty-eight young male adults were separated in a control (n = 9) and strength-training (n = 20) groups. The strength-training group completed 15 weeks of either concentric (n = 10) or eccentric (n = 10) isokinetic training of the knee extensors. Ultrasound scans of the vastus lateralis for quasi-static elastography were collected. All image acquisitions and measurements were done by the same experienced sonographer. After 15 weeks, knee maximal extension isometric torque increased in the strength-training groups. After strength training, there was a decrease in the amount of red pixels in vastus lateralis region of interest [F(1,18) = 25.490; p < 0.001; η2 = 0.586], whereas the amount of green and blue pixels increased F(1,18) = 17.179; p < 0.01; η2 = 0.488; F(1,18) = 6.522; p < 0.05; η2 = 0.266], suggesting higher vastus lateralis stiffness. We conclude that concentric and eccentric strength training increases skeletal muscle stiffness, which can be evaluated by quasi-static elastography. Ultrasound elastography is suitable for non-invasive evaluation of skeletal muscle functional adaptations, which can be of importance for sports medicine and in designing optimal training and rehabilitation programs.

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Changes in stiffness of the dorsal scapular muscles before and after computer work: a comparison between individuals with and without neck and shoulder complaints

Cited by 48 publications

References 40 publications

Determination of reference ranges for normal upper trapezius elasticity during different shoulder abduction using shear wave elastography: a preliminary study

Determination of reference ranges for normal upper trapezius elasticity during different shoulder abduction using shear wave elastography: a preliminary study

Modulation in Elastic Properties of Upper Trapezius with Varying Neck Angle

The Effect of Strength Training on Vastus Lateralis’ Stiffness: An Ultrasound Quasi-Static Elastography Study

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