Acknowledgement
We thank Carlos Valero del Campo for his technical assistance and support with thermographic assessments.
References
- Steingrimsdottir OA, Landmark T, Macfarlane GJ, Nielsen CS. Defining chronic pain in epidemiological studies: a systematic review and meta-analysis. Pain 2017; 158: 2092-107. https://doi.org/10.1097/j.pain.0000000000001009
- Gerhardt A, Hartmann M, Blumenstiel K, Tesarz J, Eich W. The prevalence rate and the role of the spatial extent of pain in nonspecific chronic back pain--a population-based study in the south-west of Germany. Pain Med 2014; 15: 1200-10. https://doi.org/10.1111/pme.12286
- Vaegter HB, Palsson TS, Graven-Nielsen T. Facilitated pronociceptive pain mechanisms in radiating back pain compared with localized back pain. J Pain 2017; 18: 973-83. https://doi.org/10.1016/j.jpain.2017.03.002
- Graven-Nielsen T. Fundamentals of muscle pain, referred pain, and deep tissue hyperalgesia. Scand J Rheumatol Suppl 2006; 122: 1-43. https://doi.org/10.1080/03009740600865980
- Domenech-Garcia V, Palsson TS, Herrero P, Graven-Nielsen T. Pressure-induced referred pain is expanded by persistent soreness. Pain 2016; 157: 1164-72. https://doi.org/10.1097/j.pain.0000000000000497
- van der Wurff P, Buijs EJ, Groen GJ. Intensity mapping of pain referral areas in sacroiliac joint pain patients. J Manipulative Physiol Ther 2006; 29: 190-5. https://doi.org/10.1016/j.jmpt.2006.01.007
- Dimcevski G, Staahl C, Andersen SD, Thorsgaard N, FunchJensen P, Arendt-Nielsen L, et al. Assessment of experimental pain from skin, muscle, and esophagus in patients with chronic pancreatitis. Pancreas 2007; 35: 22-9. https://doi.org/10.1097/mpa.0b013e31805c1762
- Masuda M, Iida T, Exposto FG, Baad-Hansen L, Kawara M, Komiyama O, et al. Referred pain and sensations evoked by standardized palpation of the masseter muscle in healthy participants. J Oral Facial Pain Headache 2018; 32: 159-66. https://doi.org/10.11607/ofph.2019
- Domenech-Garcia V, Skuli Palsson T, Boudreau SA, Herrero P, Graven-Nielsen T. Pressure-induced referred pain areas are more expansive in individuals with a recovered fracture. Pain 2018; 159: 1972-9. https://doi.org/10.1097/j.pain.0000000000001234
- Passatore M, Roatta S. Influence of sympathetic nervous system on sensorimotor function: whiplash associated disorders (WAD) as a model. Eur J Appl Physiol 2006; 98: 423-49. https://doi.org/10.1007/s00421-006-0312-8
- Martinez-Lavin M. Biology and therapy of fibromyalgia. Stress, the stress response system, and fibromyalgia. Arthritis Res Ther 2007; 9: 216. https://doi.org/10.1186/ar2146
- Zhang Y, Ge HY, Yue SW, Kimura Y, Arendt-Nielsen L. Attenuated skin blood flow response to nociceptive stimulation of latent myofascial trigger points. Arch Phys Med Rehabil 2009; 90: 325-32. https://doi.org/10.1016/j.apmr.2008.06.037
- Larsson SE, Bodegard L, Henriksson KG, Oberg PA. Chronic trapezius myalgia. Morphology and blood flow studied in 17 patients. Acta Orthop Scand 1990; 61: 394-8. https://doi.org/10.3109/17453679008993548
- Morikawa Y, Takamoto K, Nishimaru H, Taguchi T, Urakawa S, Sakai S, et al. Compression at myofascial trigger point on chronic neck pain provides pain relief through the prefrontal cortex and autonomic nervous system: a pilot study. Front Neurosci 2017; 11: 186. https://doi.org/10.3389/fnins.2017.00186
- Srbely JZ, Dickey JP, Montaholi Y. Experimentally induced central sensitization evokes segmental autonomic responses in humans. Int Phys Med Rehabil J 2017; 1: 47-53.
- Hinojosa-Laborde C, Chapa I, Lange D, Haywood JR. Gender differences in sympathetic nervous system regulation. Clin Exp Pharmacol Physiol 1999; 26: 122-6. https://doi.org/10.1046/j.1440-1681.1999.02995.x
- Hogarth AJ, Mackintosh AF, Mary DA. Gender-related differences in the sympathetic vasoconstrictor drive of normal subjects. Clin Sci (Lond) 2007; 112: 353-61. https://doi.org/10.1042/CS20060288
- Lei J, You HJ. Variation of pain and vasomotor responses evoked by intramuscular infusion of hypertonic saline in human subjects: influence of gender and its potential neural mechanisms. Brain Res Bull 2012; 87: 564-70. https://doi.org/10.1016/j.brainresbull.2011.11.003
- Fillingim RB, King CD, Ribeiro-Dasilva MC, Rahim-Williams B, Riley JL 3rd. Sex, gender, and pain: a review of recent clinical and experimental findings. J Pain 2009; 10: 447-85. https://doi.org/10.1016/j.jpain.2008.12.001
- Hildebrandt C, Raschner C, Ammer K. An overview of recent application of medical infrared thermography in sports medicine in Austria. Sensors (Basel) 2010; 10: 4700-15. https://doi.org/10.3390/s100504700
- Nahm FS. Infrared thermography in pain medicine. Korean J Pain 2013; 26: 219-22. https://doi.org/10.3344/kjp.2013.26.3.219
- Ring EF, Ammer K. Infrared thermal imaging in medicine. Physiol Meas 2012; 33: R33-46.
- Dibai-Filho AV, Guirro RRJ. Evaluation of myofascial trigger points using infrared thermography: a critical review of the literature. J Manipulative Physiol Ther 2015; 38: 86-92. https://doi.org/10.1016/j.jmpt.2014.10.010
- Simons DG, Travell JG, Simons LS. Dolor y disfuncion miofascial: el manual de los puntos gatillo. 2nd ed. Vol. 1, Mitad superior del cuerpo. Madrid, Medica Panamericana. 2001. Spanish.
- RG S. Guidelines for neuro-musculoskeletal thermography [Internet]. Greenville (SC): American Academy of Thermology; 2015. Available at: https://aathermology.org/wp-content/uploads/2018/04/AAT-NMSK-Guidelines-2021.pdf.
- Gibson W, Arendt-Nielsen L, Graven-Nielsen T. Delayed onset muscle soreness at tendon-bone junction and muscle tissue is associated with facilitated referred pain. Exp Brain Res 2006; 174: 351-60. https://doi.org/10.1007/s00221-006-0466-y
- Chesterton LS, Sim J, Wright CC, Foster NE. Interrater reliability of algometry in measuring pressure pain thresholds in healthy humans, using multiple raters. Clin J Pain 2007; 23: 760-6. https://doi.org/10.1097/AJP.0b013e318154b6ae
- Madeleine P, Mathiassen SE, Arendt-Nielsen L. Changes in the degree of motor variability associated with experimental and chronic neck-shoulder pain during a standardised repetitive arm movement. Exp Brain Res 2008; 185: 689-98. https://doi.org/10.1007/s00221-007-1199-2
- Impellizzeri FM, Maffiuletti NA. Convergent evidence for construct validity of a 7-point likert scale of lower limb muscle soreness. Clin J Sport Med 2007; 17: 494-6. https://doi.org/10.1097/JSM.0b013e31815aed57
- Choi E, Lee PB, Nahm FS. Interexaminer reliability of infrared thermography for the diagnosis of complex regional pain syndrome. Skin Res Technol 2013; 19: 189-93. https://doi.org/10.1111/srt.12032
- Kruse RA Jr, Christiansen JA. Thermographic imaging of myofascial trigger points: a follow-up study. Arch Phys Med Rehabil 1992; 73: 819-23.
- Kimura Y, Ge HY, Zhang Y, Kimura M, Sumikura H, ArendtNielsen L. Evaluation of sympathetic vasoconstrictor response following nociceptive stimulation of latent myofascial trigger points in humans. Acta Physiol (Oxf) 2009; 196: 411-7. https://doi.org/10.1111/j.1748-1716.2009.01960.x
- Skorupska E, Rychlik M, Pawelec W, Samborski W. Dry needling related short-term vasodilation in chronic sciatica under infrared thermovision. Evid Based Complement Alternat Med 2015; 2015: 214374.
- Skorupska E, Rychlik M, Samborski W. Intensive vasodilatation in the sciatic pain area after dry needling. BMC Complement Altern Med 2015; 15: 72. https://doi.org/10.1186/s12906-015-0587-6
- Cagnie B, Barbe T, De Ridder E, Van Oosterwijck J, Cools A, Danneels L. The influence of dry needling of the trapezius muscle on muscle blood flow and oxygenation. J Manipulative Physiol Ther 2012; 35: 685-91. https://doi.org/10.1016/j.jmpt.2012.10.005
- Sandberg M, Lundeberg T, Lindberg LG, Gerdle B. Effects of acupuncture on skin and muscle blood flow in healthy subjects. Eur J Appl Physiol 2003; 90: 114-9. https://doi.org/10.1007/s00421-003-0825-3
- Sandberg M, Lindberg LG, Gerdle B. Peripheral effects of needle stimulation (acupuncture) on skin and muscle blood flow in fibromyalgia. Eur J Pain 2004; 8: 163-71. https://doi.org/10.1016/S1090-3801(03)00090-9
- Sandberg M, Larsson B, Lindberg LG, Gerdle B. Different patterns of blood flow response in the trapezius muscle following needle stimulation (acupuncture) between healthy subjects and patients with fibromyalgia and work-related trapezius myalgia. Eur J Pain 2005; 9: 497-510. https://doi.org/10.1016/j.ejpain.2004.11.002
- Lei J, You HJ, Andersen OK, Graven-Nielsen T, ArendtNielsen L. Homotopic and heterotopic variation in skin blood flow and temperature following experimental muscle pain in humans. Brain Res 2008; 1232: 85-93. https://doi.org/10.1016/j.brainres.2008.07.056
- Nie H, Arendt-Nielsen L, Madeleine P, Graven-Nielsen T. Enhanced temporal summation of pressure pain in the trapezius muscle after delayed onset muscle soreness. Exp Brain Res 2006; 170: 182-90. https://doi.org/10.1007/s00221-005-0196-6
- Just TP, DeLorey DS. Sex differences in sympathetic vasoconstrictor responsiveness and sympatholysis. J Appl Physiol (1985) 2017; 123: 128-35. https://doi.org/10.1152/japplphysiol.00139.2017
- Petrini L, Matthiesen ST, Arendt-Nielsen L. The effect of age and gender on pressure pain thresholds and suprathreshold stimuli. Perception 2015; 44: 587-96. https://doi.org/10.1068/p7847
- Riley JL 3rd, Cruz-Almeida Y, Staud R, Fillingim RB. Age does not affect sex effect of conditioned pain modulation of pressure and thermal pain across 2 conditioning stimuli. Pain Rep 2020; 5: e796. https://doi.org/10.1097/pr9.0000000000000796
- Ellermeier W, Westphal W. Gender differences in pain ratings and pupil reactions to painful pressure stimuli. Pain 1995; 61: 435-9. https://doi.org/10.1016/0304-3959(94)00203-Q
- Lei J, Jin L, Zhao Y, Sui MY, Huang L, Tan YX, et al. Sex-related differences in descending norepinephrine and serotonin controls of spinal withdrawal reflex during intramuscular saline induced muscle nociception in rats. Exp Neurol 2011; 228: 206-14. https://doi.org/10.1016/j.expneurol.2011.01.004
- Mansfield KE, Sim J, Jordan JL, Jordan KP. A systematic review and meta-analysis of the prevalence of chronic widespread pain in the general population. Pain 2016; 157: 55-64. https://doi.org/10.1097/j.pain.0000000000000314
- Skorupska E, Rychlik M, Samborski W. Validation and testretest reliability of new thermographic technique called Thermovision Technique of Dry Needling for gluteus minimus trigger points in sciatica subjects and TrPs-negative healthy volunteers. Biomed Res Int 2015; 2015: 546497. https://doi.org/10.1155/2015/546497
- Haddad DS, Brioschi ML, Arita ES. Thermographic and clinical correlation of myofascial trigger points in the masticatory muscles. Dentomaxillofac Radiol 2012; 41: 621-9. https://doi.org/10.1259/dmfr/98504520
- Boudreau SA, Badsberg S, Christensen SW, Egsgaard LL. Digital pain drawings: assessing touch-screen technology and 3D body schemas. Clin J Pain 2016; 32: 139-45. https://doi.org/10.1097/AJP.0000000000000230
- Slater H, Arendt-Nielsen L, Wright A, Graven-Nielsen T. Sensory and motor effects of experimental muscle pain in patients with lateral epicondylalgia and controls with delayed onset muscle soreness. Pain 2005; 114: 118-30. https://doi.org/10.1016/j.pain.2004.12.003