L Karlsson1,2, B Gerdle1,2, B Ghafouri1,2,3,4, E Bäckryd1,2, P Olausson1,2, N Ghafouri1,2, B Larsson1,2. 1. Department of Pain and Rehabilitation Center, Linköping University, Sweden. 2. Department of Medical and Health Sciences (IMH), Linköping University, Sweden. 3. Occupational and Environmental Medicine, Department of Clinical and Experimental Medicine (IKE), Faculty of Health Sciences, Linköping University, Sweden. 4. Centre of Occupational and Environmental Medicine, UHL, County Council, Linköping, Sweden.
Abstract
BACKGROUND: In peripheral tissue, several substances influence pain and pain modulation. Exercise has been found to decrease pain and improve function for chronic pain conditions, but how and why exercise produces beneficial effects remains unclear. This study investigates whether aspects of pain and concentrations of substances with algesic, analgesic and metabolic functions differ between women with chronic neck shoulder pain (CNSP) and healthy women (CON) and whether changes are found after an exercise intervention for CNSP. METHODS: Forty-one women with CNSP and 24 CON subjects were included. The participants attended two microdialysis sessions with 4-6 months between the experiments. During this period, the CNSP subjects underwent an exercise intervention. Expression levels of substance P, beta-endorphin, cortisol, glutamate, lactate and pyruvate as well as pain intensity and pressure pain thresholds were analysed. RESULTS: At baseline, higher concentrations of glutamate and beta-endorphin and lower concentrations of cortisol in CNSP than CON were found. After exercise, decreased levels of substance P and possibly of glutamate, increased levels of beta-endorphin and cortisol as well as decreased pain intensity and increased pain pressure thresholds were found for CNSP. CONCLUSIONS: The findings at baseline indicated algesic and analgesic alterations in the painful trapezius muscles. The findings for CNSP after the exercise intervention, with changes in peripheral substances and decreased pain intensity and sensitivity, could reflect a long-term physiological effect of the exercise.
BACKGROUND: In peripheral tissue, several substances influence pain and pain modulation. Exercise has been found to decrease pain and improve function for chronic pain conditions, but how and why exercise produces beneficial effects remains unclear. This study investigates whether aspects of pain and concentrations of substances with algesic, analgesic and metabolic functions differ between women with chronic neck shoulder pain (CNSP) and healthy women (CON) and whether changes are found after an exercise intervention for CNSP. METHODS: Forty-one women with CNSP and 24 CON subjects were included. The participants attended two microdialysis sessions with 4-6 months between the experiments. During this period, the CNSP subjects underwent an exercise intervention. Expression levels of substance P, beta-endorphin, cortisol, glutamate, lactate and pyruvate as well as pain intensity and pressure pain thresholds were analysed. RESULTS: At baseline, higher concentrations of glutamate and beta-endorphin and lower concentrations of cortisol in CNSP than CON were found. After exercise, decreased levels of substance P and possibly of glutamate, increased levels of beta-endorphin and cortisol as well as decreased pain intensity and increased pain pressure thresholds were found for CNSP. CONCLUSIONS: The findings at baseline indicated algesic and analgesic alterations in the painful trapezius muscles. The findings for CNSP after the exercise intervention, with changes in peripheral substances and decreased pain intensity and sensitivity, could reflect a long-term physiological effect of the exercise.
Authors: Bijar Ghafouri; Karin Wåhlén; Ulrika Wentzel-Olausson; Staffan Smeds Journal: Int J Environ Res Public Health Date: 2021-02-04 Impact factor: 3.390
Authors: Olof Skogberg; Linn Karlsson; Björn Börsbo; Lars Arendt-Nielsen; Thomas Graven-Nielsen; Björn Gerdle; Emmanuel Bäckryd; Dag Lemming Journal: J Rehabil Med Date: 2022-04-29 Impact factor: 3.959