1. Hoy DG, Protani M, De R, Buchbinder R. The epidemiology of neck pain. Best Pract Res Clin Rheumatol. 2010;24(6):783–92.
2. Tsang SMH, Szeto GPY, Xie YF, Lee RYW. Association of electromyographic activation patterns with pain and functional disability in people with chronic neck pain. Eur J Appl Physiol. 2018;118:1–12.
3. Dieterich AV, Andrade RJ, Sant GL, Falla D, Petzke F, Hug F. Shear wave elastography reveals different degrees of passive and active stiffness of the neck extensor muscles. Eur J Appl Physiol. 2016;117(1):1–8.
4. Johnson G, Bogduk N, Nowitzke A, House D. Anatomy and actions of the trapezius muscle. Clin Biomech. 1994;9:44–50.
5. Falla D, Rainoldi A, Merletti R, Jull G. Myoelectric manifestations of sternocleidomastoid and anterior scalene muscle fatigue in chronic neck pain patients. Clin Neurophysiol. 2003;114(3):488–95.
6. Falla D, Bilenkij G, Jull G. Patients with chronic neck pain demonstrate altered patterns of muscle activation during performance of a functional upper limb task. Spine. 2004;29(13):1436–40.
7. Lieber RL, Roberts TJ, Blemker SS, Ssm L, Herzog W. Skeletal muscle mechanics, energetics and plasticity. Journal of Neuroengineering Rehabilitation. 2017;14(1):108.
8. Taljanovic MS, Gimber LH, Becker GW, Latt LD, Klauser AS, Melville DM, Gao L, Witte RS. Shear-wave elastography: basic physics and musculoskeletal applications. Radiographics. 2017;37(3):855–70.
9. Hatta T, Giambini H, Itoigawa Y, Hooke AW, Sperling JW, Steinmann SP, Itoi E, An KN. Quantifying extensibility of rotator cuff muscle with tendon rupture using shear wave elastography: a cadaveric study. J Biomech. 2017;61:131–6.
10. Leong H, Hug F, Fu SN. Increased upper trapezius muscle stiffness in overhead athletes with rotator cuff tendinopathy. Plos One. 2016;11(5):e0155187.
11. Zhang ZJ, Ng GY, Lee WC, Fu SN. Changes in morphological and elastic properties of patellar tendon in athletes with unilateral patellar tendinopathy and their relationships with pain and functional disability. Plos One. 2014;9:e108337.
12. Zhang ZJ, Ng GY, Lee WC, Fu SN. Increase in passive muscle tension of the quadriceps muscle heads in jumping athletes with patellar tendinopathy. Scandinavian Journal of Medicine Science in Sports. 2016;27:1099–104.
13. Zhang ZJ, Fu SN. Shear elastic modulus on patellar tendon captured from supersonic shear imaging: correlation with tangent traction modulus computed from material testing system and test–retest reliability. Plos One. 2013;8(6):e68216.
14. Wu CH, Ho YC, Hsiao MY, Chen WS, Wang TG. Evaluation of post-stroke spastic muscle stiffness using shear wave ultrasound elastography. Ultrasound in Medicine Biology. 2017;43:1105–11.
15. Rasim UHM, Ali SS, Rasheed A, Khan M. Frequency and associated risk factors for neck pain among software engineers in karachi, Pakistan. Journal of Pakistan Medical Students. 2017;67:1009–12.
16. Lee S, Lee D, Park J. Effect of the cervical flexion angle during smart phone use on muscle fatigueof the cervical erector spinae and upper trapezius. Journal of Physical Therapy Science. 2015;27(6):1847–49.
17. Sjøgaard G, Rosendal L, Kristiansen J, Blangsted AK, Skotte J, Larsson B, Gerdle B, Saltin B, Sagaard K. Muscle oxygenation and glycolysis in females with trapezius myalgia during stress and repetitive work using microdialysis and NIRS. Eur J Appl Physiol. 2010;108(4):657–69.
18. Carlsson AM. Assessment of chronic pain. I. aspects of the reliability and validity of the visual analogue scale. Pain. 1983;16:87–101.
19. Sherman KJ, Cook AJ, Wellman RD, Hawkes RJ, Kahn JR, Deyo RA, Cherkin DC. Five-week outcomes from a dosing trial of therapeutic massage for chronic neck pain. Annals of Family Medicine. 2014;12(2):112–20.
20. Bercoff J, Tanter M, Fink M. Supersonic shear imaging: a new technique for soft tissue elasticity mapping. IEEE Trans Ultrason Ferroelectr Freq Control. 2004;51(4):396–409.
21. Tanter M, Bercoff J, Athanasiou A, Deffieux T, Fink M. Quantitative assessment of breast lesion viscoelasticity: initial clinical results using supersonic shear imaging. Ultrasound in Medicine Biology. 2008;34(9):1373–86.
22. Doherty JR, Trahey GE, Nightingale KR, Palmeri ML. Acoustic radiation force elasticity imaging in diagnostic ultrasound. IEEE Transactions on Ultrasonics Ferroelectrics Frequency Control. 2013;60(4):685–701.
23. Shin YJ, Kim WH, Kim SG. Correlations among visual analogue scale, neck disability index, shoulder joint range of motion, and muscle strength in young women with forward head posture. Journal of Exercise Rehabilitation. 2017;13(4):413–17.
24. Pourahmadi MR, Bagheri R, Taghipour M, Takamjani IE, Sarrafzadeh J, Mohseni-Bandpei MA. A new iPhone® application for measuring active craniocervical range of motion in patients with non-specific neck pain: a reliability and validity study. The Spine Journal. 2017;18:447–57.
25. Zhang J, Yu JF, Liu CL, Tang CZ, Zhang ZJ. Modulation in Elastic Properties of Upper Trapezius with Varying Neck Angle. Appl Bionics Biomech. 2019.
26. Ballyns J, Turo D, Otto P, Shah J, Hammond J, Gebreab T, Gerber HL, Sikdar S. Office-Based Elastographic Technique for Quantifying Mechanical Properties of Skeletal Muscle. J Ultrasound Med. 2012;31(8):1209–19.
27. Bland JM, Altman DG. A note on the use of the intraclass correlation coefficient in the evaluation of agreement between two methods of measurement. Computers in Biology Medicine. 1990;20(5):337–40.
28. Jeon M, Youn K, Yang S. Reliability and quantification of gastrocnemius elasticity at relaxing and at submaximal contracted condition. Medical ultrasonography. 2018;20:342–47.
29. Kim K, Hwang HJ, Kim SG, Lee JH, Jeong WK. Can shoulder muscle activity be evaluated with ultrasound shear wave elastography? Clinical Orthopaedics Related Research. 2018;476(6):1276–83.
30. Du LJ, He W, Cheng LG, Li S, Pan YS, Gao J. Ultrasound shear wave elastography in assessment of muscle stiffness in patients with parkinson's disease: a primary observation. Clin Imaging. 2016;40(6):1075–80.
31. Leong HT, Ng GY, Leung VY, Fu SN. Quantitative estimation of muscle shear elastic modulus of the upper trapezius with supersonic shear imaging during arm positioning. Plos One. 2013;8(6):e67199.
32. Hu X, Lei D, Li L, Leng Y, Yu Q, Wei X, Lo WLA. Quantifying paraspinal muscle tone and stiffness in young adults with chronic low back pain: a reliability study. Sci Report. 2018;8:14343.
33. Maher RM, Hayes DM, Shinohara M. Quantification of dry needling and posture effects on myofascial trigger points using ultrasound shear-wave elastography. Arch Phys Med Rehabil. 2013;94(11):2146–50.
34. Cornachione AS, Rassier DE. A non-cross-bridge, static tension is present in permeabilized skeletal muscle fibers after active force inhibition or actin extraction. Am J Physiol Cell Physiol. 2012;302(3):566–74.
35. Shin SJ, An DH, Oh JS, Yoo WG. Changes in pressure pain in the upper trapezius muscle, cervical range of motion, and the cervical flexion-relaxation ratio after overhead work. Ind Health. 2012;50(6):509–15.
36. Flodgren GM, Crenshaw AG, Alfredson H, Fahlström M, Hellström FB, Bronemo L, Djupsjöbacka M. Glutamate and prostaglandin E2, in the trapezius muscle of female subjects with chronic muscle pain and controls determined by microdialysis. Eur J Pain. 2005;9(5):511–15.
37. Lopez-De-Uralde-Villanueva I, Beltran-Alacreu H, Fernandez-Carnero J, Kindelan-Calvo P. La TR. Widespread pressure pain hyperalgesia in chronic nonspecific neck pain with neuropathic features: a descriptive cross-sectional study. Pain Physician. 2016;19(2):77–88.
38. Gonçalves MC, Chaves TC, Florencio LL, Carvalho GF, Dach F, Fernández-De-Las-Penãs C, Bevilaqua-Grossi D. Is pressure pain sensitivity over the cervical musculature associated with neck disability in individuals with migraine. J Bodyw Mov Ther. 2015;19(1):67–71.