Central fatigue mechanisms are responsible for decreases in hand proprioceptive acuity following shoulder muscle fatigue |
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| Institution: | 1. College of Kinesiology, University of Saskatchewan, 87 Campus Drive, Saskatoon, SK S7T 0E8, Canada;2. School of Physical Education and Sport of Ribeirão Preto, University of São Paulo, Brazil;1. Lebanese University, Rafic Hariri Campus, Faculty of Public Health, Lebanon;2. Université de Lyon, Université Lyon 1, LVIS – EA 7428, SFR CRIS – FED 4272, 69 622 Villeurbanne Cedex, France;3. Université de Lyon, Université Lyon 1, LIBM – EA 7424, SFR CRIS – FED 4272, 69 622 Villeurbanne Cedex, France;1. Department of Public Health and Clinical Medicine, Section of Sustainable Health, Umeå University, Umeå, Sweden;2. Department of Community Medicine and Rehabilitation, Geriatric Medicine, Umeå University, Umeå, Sweden;3. Department of Integrative Medical Biology, Physiology Section, Umeå University, Umeå, Sweden;1. Department of Kinesiology and Physical Education, McGill University, Montreal, QC H2W 1S4, Canada;2. Occupational Biomechanics and Ergonomics Laboratory, Michael Feil and Ted Oberfeld/CRIR Research Centre, Jewish Rehabilitation Hospital, Laval, QC H7V 1R2, Canada;3. Laboratoire de simulation et modélisation du mouvement, Département de kinésiologie, Université de Montréal, Laval, QC H7N 0A5, Canada;4. Grado Department of Industrial and Systems Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA |
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| Abstract: | Muscle fatigue is a complex phenomenon, consisting of central and peripheral mechanisms which contribute to local and systemic changes in motor performance. In particular, it has been demonstrated that afferent processing in the fatigued muscle (e.g., shoulder), as well as in surrounding or distal muscles (e.g., hand) can be altered by fatigue. Currently, it is unclear how proximal muscle fatigue affects proprioceptive acuity of the distal limb. The purpose of the present study was to assess the effects of shoulder muscle fatigue on participants’ ability to judge the location of their hand using only proprioceptive cues. Participants’ (N = 16) limbs were moved outwards by a robot manipulandum and they were instructed to estimate the position of their hand relative to one of four visual reference targets (two near, two far). This estimation task was completed before and after a repetitive pointing task was performed to fatigue the shoulder muscles. To assess central versus peripheral effects of fatigue on the distal limb, the right shoulder was fatigued and proprioceptive acuity of the left and right hands were tested. Results showed that there was a significant decrease in the accuracy of proprioceptive estimates for both hands after the right shoulder was fatigued, with no change in the precision of proprioceptive estimates. A control experiment (N = 8), in which participants completed the proprioceptive estimation task before and after a period of quiet sitting, ruled out the possibility that the bilateral changes in proprioceptive accuracy were due to a practice effect. Together, these results indicate that shoulder muscle fatigue decreases proprioceptive acuity in both hands, suggesting that central fatigue mechanisms are primarily responsible for changes in afferent feedback processing of the distal upper limb. |
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| Keywords: | Muscle fatigue Proprioceptive acuity Joint position sense Passive positioning |
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