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Salehi Sahl Abadi, A, Mazloumi, A, Nasl Saraji, G, Zeraati, H, Hadian, M R, Jafari, A H. (1396). Determining Changes in Electromyography Indices when Measuring Maximum Acceptable Weight of Lift in Iranian Male Students. سامانه مدیریت نشریات علمی, 8(1), 73-86. doi: 10.31661/jbpe.v8i1Mar.443
A Salehi Sahl Abadi; A Mazloumi; G Nasl Saraji; H Zeraati; M R Hadian; A H Jafari. "Determining Changes in Electromyography Indices when Measuring Maximum Acceptable Weight of Lift in Iranian Male Students". سامانه مدیریت نشریات علمی, 8, 1, 1396, 73-86. doi: 10.31661/jbpe.v8i1Mar.443
Salehi Sahl Abadi, A, Mazloumi, A, Nasl Saraji, G, Zeraati, H, Hadian, M R, Jafari, A H. (1396). 'Determining Changes in Electromyography Indices when Measuring Maximum Acceptable Weight of Lift in Iranian Male Students', سامانه مدیریت نشریات علمی, 8(1), pp. 73-86. doi: 10.31661/jbpe.v8i1Mar.443
Salehi Sahl Abadi, A, Mazloumi, A, Nasl Saraji, G, Zeraati, H, Hadian, M R, Jafari, A H. Determining Changes in Electromyography Indices when Measuring Maximum Acceptable Weight of Lift in Iranian Male Students. سامانه مدیریت نشریات علمی, 1396; 8(1): 73-86. doi: 10.31661/jbpe.v8i1Mar.443

Determining Changes in Electromyography Indices when Measuring Maximum Acceptable Weight of Lift in Iranian Male Students

Journal of Biomedical Physics and Engineering
مقاله 8، دوره 8، شماره 1، خرداد 2018، صفحه 73-86    اصل مقاله (810.9 K)
نوع مقاله: Original Research
شناسه دیجیتال (DOI): 10.31661/jbpe.v8i1Mar.443
نویسندگان
A Salehi Sahl Abadi* 1؛ A Mazloumi2؛ G Nasl Saraji2؛ H Zeraati3؛ M R Hadian4؛ A H Jafari5
1Department of Occupational Health, School of Public Health, Shahid Beheshti University of Medical Sciences, Tehran, Iran
2Department of Occupational Health, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
3Department of Biostatistics, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
4Department of Postgraduate Studies, Faculty of Rehabilitation, Tehran University of Medical Sciences, Int. Campus (TUMS-IC), Tehran, Iran
5Medical Physics and Biomedical Engineering Department, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
چکیده
Background: In spite of the increasing degree of automation in industry, manual material handling (MMH) is still performed in many occupational settings. The aim of the current study was to determine the maximum acceptable weight of lift using psychophysical and electromyography indices.Methods: This experimental study was conducted among 15 male students recruited from Tehran University of Medical Sciences. Each participant performed 18 different lifting tasks which involved three lifting frequencies, three lifting heights and two box sizes. Each set of experiments was conducted during the 20 min work period using free-style lifting technique and subjective as well as objective assessment methodologies. SPSS version 18 software was used for descriptive and analytical analyses by Friedman, Wilcoxon and Spearman correlation techniques.Results: The results demonstrated that muscle activity increased with increasing frequency, height of lift and box size (P<0.05). Meanwhile, MAWLs obtained in this study are lower than those in Snook table (P<0.05). In this study, the level of muscle activity in percent MVC in relation to the erector spine muscles in L3 and T9 regions as well as left and right abdominal external oblique muscles were at 38.89%, 27.78%, 11.11% and 5.55% in terms of muscle activity is more than 70% MVC, respectively. The results of Wilcoxon test revealed that for both small and large boxes under all conditions, significant differences were detected between the beginning and end of the test values for MPF of erector spine in L3 and T9 regions, and left and right abdominal external oblique muscles (P<0.05). The results of Spearman correlation test showed that there was a significant relation between the MAWL, RMS and MPF of the muscles in all test conditions (P<0.05).Conclusion: Based on the results of this study, it was concluded if muscle activity is more than 70% of MVC, the values of Snook tables should be revisited. Furthermore, the biomechanical perspective should receive special attention in determining the standards for MMH 
کلیدواژه‌ها
MMH؛ MAWL؛ EMG؛ Psychophysical Methodology
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