In a dynamic lifting task,the relationship between cross-sectional abdominal muscle thickness and the corresponding muscle activity is affected by the combined use of a weightlifting belt and the Valsalva maneuver |
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| Affiliation: | 1. Laboratory of Biophysics, Department of Physics, Faculty of Science, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon;2. Botswana International University of Science and Technology, Private Bag 16 Palapye, Botswana;3. The African Institute for Mathematical Sciences, 6-8 Melrose Rd, Muizenberg 7945, South Africa;4. Laboratory of Material Sciences, Department of Physics, Faculty of Science, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon;5. Department of Physics, Faculty of Science, University of Maroua, P.O. Box 46, Maroua, Cameroon;1. UMR 1114 EMMAH, Université d’Avignon et des Pays de Vaucluse, Campus Jean-Henri Fabre, Agroparc, 201 rue Baruch de Spinoza,BP 21239, F-84916 Avignon Cedex 9, France;2. UMR 1114 EMMAH, INRA, Domaine Saint Paul - Site Agroparc, F-84914 Avignon Cedex 9, France;1. Asia Pacific Center for Theoretical Physics, Pohang 37673, Republic of Korea;2. Center for Quantum Spacetime, Sogang University, Seoul 04107, Republic of Korea;3. Department of Physics, Sogang University, Seoul 04107, Republic of Korea;1. Supercomputing Center of Computer Network Information Center, Chinese Academy of Sciences, Beijing 100190, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China;4. Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, China;1. National Research Institute of Electronics and Cryptology, TÜBİTAK, 41470 Kocaeli, Turkey;2. Bogazici University, Department of Electrical and Electronics Engineering, 34342 Bebek, Istanbul, Turkey |
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| Abstract: | It has been shown that under isometric conditions, as the activity of the abdominal muscles increases, the thicknesses of the muscles also increase. The purpose of this experiment was to determine whether change in muscle thickness could be used as a measure of muscle activity during a deadlift as well as determining the effect of a weightlifting belt and/or the Valsalva maneuver on the muscle thicknesses. The Transversus Abdominis (TrA) and Internal Obliques (IO) muscles were analyzed at rest and during a deadlift. Muscle thickness was measured using ultrasound imaging and muscle activity was simultaneously recorded using electromyography. Each subject performed deadlift under normal conditions, while performing the Valsalva maneuver, while wearing a weightlifting belt and while both utilizing the belt and the Valsalva maneuver. There was no relationship between change in muscle thickness and muscle activity for both the TrA and IO (R2 < 0.13 for all conditions). However it was found that the Valsalva maneuver increased abdominal muscle thickness whereas the belt limited muscle expansion; each with an increase in activity. These results indicate that ultrasound cannot be used to measure muscle activity for a deadlift and that the belt affects how the IO and TrA function together. |
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| Keywords: | Low-back belt Valsalva Ultrasound EMG Muscle thickness |
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