Are regions of the lumbar multifidus differentially activated during walking at varied speed and inclination? |
| |
| Institution: | 1. Institute for Health Sciences, Zürich University of Applied Sciences, Technikumstrasse 71, Winterthur 8401, Switzerland;2. Faculty of Health Professions, Curtin University, Kent Street, Perth 6102, Australia;3. Institute of Neurorehabilitation Systems, Bernstein Focus Neurotechnology Göttingen, Bernstein Center for Computational Neuroscience, University Medical Center Göttingen, Georg-August University, Göttingen, Germany;4. School of Sport, Exercise and Rehabilitation Sciences, College of Life and Environmental Sciences, University of Birmingham, Birmingham, UK;1. Laboratory of Biomechanics of Human Movement, Dept. Physical Therapy, Speech and Occupational Therapy, School of Medicine, University of Sao Paulo, Sao Paulo, Brazil;2. Human Performance Laboratory, School of Physical Education and Physiotherapy, Federal University of Amazonas, Amazonas, Brazil;1. Department of Physical Medicine and Rehabilitation, Bagcilar Training and Research Hospital, Istanbul, Turkey;2. Koç University School of Medicine, Istanbul, Turkey;3. Institute of Biomedical Engineering, Fatih University, Istanbul, Turkey;1. EMPA, Swiss Federal Laboratories for Materials Science and Technology, Mechanical Systems Engineering, Ueberlandstrasse 129, 8400 Duebendorf, Switzerland;2. Department of Orthopaedic Surgery, University of Pittsburgh, Pittsburgh, PA 15261, USA;3. Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA 15261, USA;4. Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, PA 15261, USA;1. Department of Electrical and Electronical Engineering, Public University of Navarra, Pamplona, Spain;2. Pediatric Neurology Unit, Virgen del Camino Hospital, Pamplona, Spain;1. Biomechanics and Sport Performance Laboratory, California State University, San Bernardino, San Bernardino, CA 92407, United States;2. Sensory and Muscle Function Laboratory, The University of Oklahoma, Norman, OK 73019, United States;3. Applied Biomechanics Laboratory, The University of Mississippi, University, MS 38677, United States;4. Department of Kinesiology and Health Promotion, Troy University, Troy, AL 36081, United States;1. Department of Physiotherapy, Federal University of São Carlos (UFSCar), São Carlos, SP, Brazil;2. Physical Therapy Program, School of Medicine and Health Science, University of Rosario, Bogotá, D.C., Colombia |
| |
| Abstract: | PurposeLumbar multifidus is a complex muscle with multi-fascicular morphology shown to be differentially controlled in healthy individuals during sagittal-plane motion. The normal behaviour of multifidus muscle regions during walking has only received modest attention in the literature. This study aimed to determine activation patterns for deep and superficial multifidus in young adults during walking at different speeds and inclination.MethodsThis observational cohort study evaluated ten healthy volunteers in their twenties (three women, seven men) as they walked on a treadmill in eight conditions; at 2 km/h and 4 km/h, each at 0, 1, 5, and 10% inclination. Intramuscular EMG was recorded from the deep and superficial multifidus unilaterally at L5. Activity was characterized by: amplitude of the peak of activation, position of peak within the gait cycle (0–100%), and duration relative to the full gait cycle.ResultsAcross all conditions superficial multifidus showed higher normalised EMG amplitude (p < 0.01); superficial multifidus peak amplitude was 232 ± 115% higher when walking at 4 km/h/10%, versus only 172 ± 77% higher for deeper region (p < 0.01). The percentage of the gait cycle where peak EMG amplitude was detected did not differ between regions (49 ± 13%). Deep multifidus duration of activation was longer when walking at the faster vs slower speed at all inclinations (p < 0.01), which was not evident for superficial multifidus (p < 0.05). Thus, a significantly longer activation of deep multifidus was observed compared to superficial multifidus when walking at 4 km/h (p < 0.05).ConclusionsDifferential activation within lumbar multifidus was shown in young adults during walking. The prolonged, more tonic activation of deep relative to superficial regions of multifidus during gait supports a postural function of deeper fibres. |
| |
| Keywords: | Lumbar spine Multifidus Intramuscular electromyography Gait Function |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
