Control of interjoint coordination in the performance of manual circular movements can explain lateral specialization |
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| Institution: | 1. University of São Paulo, Human Motor Systems Laboratory, São Paulo, Brazil;2. Biomedical Engineering, Federal University of ABC, São Paulo, Brazil;1. RITMO Centre for Interdisciplinary Studies in Rhythm, Time and Motion, University of Oslo, P.O. Box 1133, Blindern, Oslo 0318, Norway;2. Department of Psychology, University of Oslo, P.O. Box 1094, Blindern, Oslo 0317, Norway;3. Department of Psychology, Oslo New University College, Lovisenberggata 13, Oslo 0456, Norway;4. Department of Musicology, University of Oslo, P.O. Box 1017, Blindern, Oslo 0315, Norway;1. Department of Medicine (DIMED), Geriatrics Division, University of Padua, Padua, Italy;2. Department of General Psychology (DPG), University of Padova, Padua, Italy;3. Department of Internal Medicine, Azienda USL Toscana Centro, Mugello Hospital, Borgo San Lorenzo, Italy;1. Department of Kinesiology, University of Massachusetts Amherst, Amherst, MA, USA;2. Department of Kinesiology, The University of Alabama, Tuscaloosa, AL, USA;3. Department of Epidemiology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA;4. Department of Mathematics and Statistics, University of Massachusetts Amherst, Amherst, MA, USA;5. College of Health and Human Services, University of North Carolina at Charlotte, Charlotte, NC, USA;6. Department of Kinesiology, California State University, Long Beach, Long Beach, CA, USA;1. Department of Rehabilitation, Faculty of Health Science, University of Human Arts and Sciences, 354-3 Shinshoji-Guruwa, Ota-aza, Iwatsuki-ku, Saitama-shi, Saitama 339-8555, Japan;2. Department of Rehabilitation, Higashi Saitama General Hospital, 517-5 Yoshino, Satte-shi, Saitama 340-0153, Japan;3. Department of Rehabilitation, Faculty of Health Sciences, Tokyo Kasei University, 2-15-1 Inariyama, Sayama-shi, Saitama 350-1398, Japan;4. Research Development Center, Saitama Prefectural University, 820 San-Nomiya, Koshigaya-shi, Saitama 343-8540, Japan;5. Sportology Center, Juntendo University Graduate School of Medicine, 2-1-1 Hongo, Bunkyo-ku, Tokyo 113-8421, Japan;6. Department of Health and Social Services, Saitama Prefectural University, 820 San-Nomiya, Koshigaya-shi, Saitama 343-8540, Japan;1. Department of Kinesiology, Louisiana Tech University, Ruston, LA 71272, USA;2. School of Kinesiology and Nutrition, University of Southern Mississippi, Hattiesburg, MS 39406, USA |
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| Abstract: | Between-arm performance asymmetry can be seen in different arm movements requiring specific interjoint coordination to generate the desired hand trajectory. In the current investigation, we assessed between-arm asymmetry of shoulder-elbow coordination and its stability in the performance of circular movements. Participants were 16 healthy right-handed university students. The task consisted of performing cyclic circular movements with either the dominant right arm or the nondominant left arm at movement frequencies ranging from 40% of maximum to maximum frequency in steps of 15%. Kinematic analysis of shoulder and elbow motions was performed through an optoelectronic system in the three-dimensional space. Results showed that as movement frequency increased circularity of left arm movements diminished, taking an elliptical shape, becoming significantly different from the right arm at higher movement frequencies. Shoulder-elbow coordination was found to be asymmetric between the two arms across movement frequencies, with lower shoulder-elbow angle coefficients and higher relative phase for the left compared to the right arm. Results also revealed greater variability of left arm movements in all variables assessed, an outcome observed from low to high movement frequencies. From these findings, we propose that specialization of the left cerebral hemisphere for motor control resides in its higher capacity to generate appropriate and stable interjoint coordination leading to the planned hand trajectory. |
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