Isometric exercise and pain in patellar tendinopathy: A randomized crossover trial |
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| Affiliation: | 1. Research Unit for General Practice in Aalborg, Department of Clinical Medicine, Aalborg University, Denmark;2. Center for Neuroplasticity and Pain (CNAP), SMI, Department of Health Science and Technology, Aalborg University, Denmark;3. SMI, Department of Health Science and Technology, Aalborg University, Denmark;4. Department of Physiotherapy, University College of Northern Denmark, Denmark;1. Pain Research and Intervention Center of Excellence, College of Dentistry, University of Florida, Gainesville, Florida;2. Department of Kinesiology, Indiana University Purdue University Indianapolis, Indianapolis, Indiana;1. Department of Physical Medicine and Rehabilitation, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan;2. Department of Orthopedic Surgery, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan;3. Medical Mechatronic Engineering Program, Cheng Shiu University, Kaohsiung, Taiwan;4. Institute of Epidemiology and Preventive Medicine, College of Public Health, National Taiwan University, Taipei, Taiwan;5. Department of Dentistry, National Taiwan University Hospital, Taipei, Taiwan;1. La Trobe Sport and Exercise Medicine Research Centre, College of Science, Health and Engineering, La Trobe University, Australia;2. School of Environmental and Life Sciences, University of Newcastle, Newcastle, Australia;3. Priority Research Centre for Physical Activity and Nutrition, University of Newcastle, Callaghan, NSW, Australia;1. Studioerre, Via della Badia 18, 25127, Brescia, BS, Italy;2. Smuoviti, Viale Giulio Cesare, 29, 24121, Bergamo, BG, Italy;3. London Sport Institute, School of Science and Technology, Middlesex University, Greenlands Lane, London, United Kingdom;4. Department of Information Engineering, University of Brescia, Italy;5. Laboratory of Clinical Integrative Physiology, University of Brescia, Italy;6. Department of Clinical and Experimental Sciences, University of Brescia, Italy;7. School of Health, Wellbeing and Life Sciences, Sheffield Hallam University, Broomhall Road, Sheffield, United Kingdom;1. Department of Orthopaedics, The Ohio State University, Columbus, Ohio, U.S.A.;2. College of Medicine, The Ohio State University, Columbus, Ohio, U.S.A.;3. Division of Physical Therapy, School of Health and Rehabilitation Sciences, The Ohio State University, Columbus, Ohio, U.S.A.;4. Cartilage Restoration Center, The Ohio State University, Columbus, Ohio, U.S.A. |
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| Abstract: | ObjectivesThe aim of this study was to compare the acute effects of isometric versus dynamic resistance exercise on pain during a pain-provoking activity, and exercise-induced hypoalgesia in participants with patellar tendinopathy.DesignThis study was a pre-registered randomised crossover study. Participants were blinded to the study hypothesis.MethodsParticipants (N = 21) performed a single session of high load isometric resistance exercise or dynamic resistance exercise, in a randomised order separated by a 7-day washout period. Outcomes were assessed before, immediately after, and 45 min post-exercise. The primary outcome was pain intensity scored on a numeric pain rating scale (NRS; 0–10) during a pain-provoking single leg decline squat (SLDS). Secondary outcomes were pressure pain thresholds (PPTs) locally, distally and remotely, as well as tendon thickness.ResultsThere was a significant decrease in pain NRS scores (mean reduction 0.9, NRS 95%CI 0.1–1.7; p = 0.028), and increase in PPTs at the tibialis anterior muscle (mean increase 34 kPa 95%CI 9.5–58.5; p = 0.009) immediately post-exercise. These were not sustained 45 min post-exercise for pain (NRS) or PPTs (p > 0.05). There were no differences between exercise on any outcome.ConclusionsWhile patients with patellar tendinopathy decreased pain during SLDS in response to resistance training, but the magnitude was small. Contraction mode may not be the most important factor in determining the magnitude of pain relieving effects. Similarly, there were only small increases in PPTs at the tibialis anterior which were not superior for isometric exercise. |
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| Keywords: | Pain measurement Pain threshold Psychophysiology Exercise induced hypoalgesia Resistance exercise Pain relief Tendon Athletes |
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