Alternating activation is related to fatigue in lumbar muscles during sustained sitting |
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| Affiliation: | 1. Department of Neuroscience, Norwegian University of Science and Technology, Trondheim, Norway;2. Clinic Physical Medicine and Rehabilitation, Vestfold Hospital Trust, Stavern, Norway;1. Division of Endocrinology, Diabetology and Metabolism, Department of Medical Sciences, University of Turin, Turin, Italy;2. Neuromuscular Research Laboratory, Schulthess Clinic, Zurich, Switzerland;3. Division of Physical Medicine and Rehabilitation, Department of Surgical Sciences, University of Turin, Turin, Italy;1. Department of Stomatology, Santiago de Compostela University, Faculty of Medicine and Dentistry, Spain;2. Department of Statistics, Santiago de Compostela University, Faculty of Medicine and Dentistry, Spain;3. Oral and Maxillofacial Surgery Service, University Hospital of La Coruña, Spain;1. Neuromuscular Research Center, Department of Biology of Physical Activity, University of Jyväskylä, Finland;2. Turku PET Centre, Turku, Finland;3. Department of Physical Performance, Norwegian School of Sport Sciences, Oslo, Norway;4. Institute of Sports Medicine Copenhagen & Musculoskeletal Rehabilitation Research Unit, Bispebjerg Hospital, Faculty of Health Sciences, University of Copenhagen, Copenhagen, Denmark;5. Department of Orthopaedics and Traumatology, Turku University and University Hospital, Turku, Finland;1. Institute of General Kinesiology and Athletics Training, University of Leipzig, Germany;2. Medical Clinic, Department of Sports Medicine, University of Tübingen, Germany;1. Department of Physical Education, College of Sciences in Education, Yonsei University, Seoul, Republic of Korea;2. Department of Silver Industrial Engineering, College of Future Human Resource Development, Kangnam University, Yongin, Republic of Korea |
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| Abstract: | The aim of this study was to investigate the relation between variability in muscle activity and fatigue during a sustained low level contraction in the lumbar muscles. Twenty-five healthy participants (13 men 12 women) performed a 30 min sitting task with 5 degrees inclination of the trunk. Surface electromyographic (EMG) signals were recorded bilaterally from the lumbar muscles with 2 high density surface EMG grids of 9 × 14 electrodes. Median frequency (MDF) decrease, amplitude (RMS) increase and the rating of perceived exertion (RPE) were used as fatigue indices. Alternating activation and spatial and temporal variability were computed and relations with the fatigue indices were explored. During sitting, the mono- and bipolar RMS slightly increased while the MDF remained unchanged indicating no systematic muscle fatigue, although the average RPE increased from 6 to 13 on a scale ranging between 6 and 20. Higher frequency of alternating activation between the left and right side was associated with increased RPE (p = 0.03) and decreased MDF (p = 0.05). A tendency in the same direction was seen between increased spatial and temporal variation within the grids and increased RPE and decreased MDF. Present findings provide evidence for a relationship between variability in muscle activity and fatigue. |
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| Keywords: | Low back HDsEMG Muscle fatigue Alternating activation Submaximal contraction |
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