Measurement of Low Back Muscle Fatigue and Recovery Time During and After Isometric Endurance Test
The aim of this study was to examine the relationship between myoelectrical manifestation and muscle oxygenation level by surface electromyography (EMG) and Near-infrared spectroscopy (NIRS), respectively. As well as the recovery time based on tissue oxyg
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Abstract The aim of this study was to examine the relationship between myoelectrical manifestation and muscle oxygenation level by surface electromyography (EMG) and Near-infrared spectroscopy (NIRS), respectively. As well as the recovery time based on tissue oxygenation index (TOI) after isometric exercise on erector spinae muscle (ESM). Eleven healthy females (age = 18.8 ± 0.7 years, height = 1.59 ± 0.0 m, BMI = 20.1 ± 1.8; mean ± SD) performed an isometric back trunk extension (Biering-Sørensen Muscle Endurance test—BSME) of their 40 % of their mean maximal voluntary contraction (MVC) until exhaustion. Muscle oxygenation decreased immediately at the beginning of exercise. Maximal deoxygenation occurred at 100 % BSME time, and decreased about 15 % from the resting value. A strong correlation between frequency content of the EMG signal and TOI was established, r = 0.78 (right) and r = 0.90 (left). These findings suggest that the fatigue resulting from sustained isometric exercise are related to a decrease in oxygenation level following by the increasing time of contraction of the ESM.
Keywords Isometric contraction Near infrared spectroscopy Electromyography
1 Introduction Identifying physical limitations has long been the focal point of analysis in sport, exercise, rehabilitation, and ergonomics. It is crucial to identify the potential mechanism/sources of exhaustion to prevent musculoskeletal damage. Muscle fatigue, from static and repetitive tasks, is one process that can be implicated as a D. Mori (&) H. Sumiil T. Ono T. Horiuchi Biological System Sciences, Prefectural University of Hiroshima, 727-0023, Nanatsuka-cho 562, Shobara City, Hiroshima Prefecture, Japan e-mail: [email protected] M. Shiokawa M. Kunisada T. Harada Prefectural University of Hiroshima, 723-0053, Gakuen-cho 1-1, Mihara City, Hiroshima Prefecture, Japan © Springer International Publishing Switzerland 2016 R. Goonetilleke and W. Karwowski (eds.), Advances in Physical Ergonomics and Human Factors, Advances in Intelligent Systems and Computing 489, DOI 10.1007/978-3-319-41694-6_31
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potential source of injury. The Biering-Sørensen muscle endurance test (BSME), an isometric back endurance test, is commonly used to measure the endurance capacity and fatigue of the back muscles [1]. Procedures for the test have been previously reported in subjects with and without back pain to determine their muscle potential [1–4]. Near-infrared Spectroscopy (NIRS) was developed as a noninvasive method to examine muscle oxygenation and oxidative metabolism. NIRS quantifies the changes in hemodynamics by changes in the absorption of near-infrared light by oxyhemoglobin and deoxyhemoglobin. By using this technique, tissue organization can be measured in a discrete region in a working physiological setting, which enhances the specificity of the test (2.5). Several studies have used NIRS to examine trends in erector spinae oxygenation and blood volume during isometric contraction of the lumbar extensors [3, 6–1
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