Evaluation of upper body kinematics and muscle activity during milking attachment task |
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| Affiliation: | 1. University of Texas San Antonio, United States;2. University of Texas Health Science Center at San Antonio, United States;3. University of Texas, Health Science Center at Houston, School of Public Health in San Antonio, San Antonio Regional Campus, United States;1. Colorado State University, Environmental and Radiological Health Sciences Department, 1681 Campus Delivery, Fort Collins, CO 80523, USA;2. Universita'' Degli Studi di Sassari, Dipartimento di Agraria, Viale Italia, 39 - 07100 Sassari, Italy;1. Las.E.R. Laboratory, Dept. of Industrial and Information Engineering and Economics (DIIIE), University of L''Aquila, Piazzale E. Pontieri no. 1, Monteluco di Roio, L''Aquila I-67100, Italy;2. Tomsk Polytechnic University, Lenin Av., 30, Tomsk 634050, Russia;3. Computer Vision and Systems Laboratory, Dept. of Electrical and Computer Engineering, Université Laval, 1065, av. de la Médecine, Quebec City, Quebec G1V 0A6, Canada;4. NDT Laboratory, Dept. of Materials Science and Engineering – School of Chemical Engineering, National Technical University of Athens, Iroon Polytechniou 9, Athens, GR 15780, Greece;1. Makah Fisheries Management, Makah Tribe, PO Box 115, Neah Bay, WA 98357, USA;2. Scordino Consulting, Edmonds, WA 98020, USA |
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| Abstract: | The objective of the study was to evaluate the effects of udder height on upper body kinematics and muscle activity during a simulated attachment task in a parallel parlor set up, and the effects of udder access method (back or side) on the task biomechanics. Twenty males performed the task under conditions that simulated three udder heights and two udder access methods. The muscular load and kinematics during the task confirmed that milking is a physically demanding task. Trunk flexion angle increased with decreasing udder height, and the erector spinae activation was higher when the udder was below shoulder height compared to at or above. Compared to accessing the udder from side of the cow (herringbone parlor style), accessing from behind (Parallel parlor style) was associated with lower trunk flexion, greater shoulder horizontal adduction, lower shoulder elevation, and greater anterior deltoid activation. Milking in herringbone parlor style and with the udder at or above shoulder level may help reduce strain on the trunk/neck. |
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| Keywords: | Ergonomics Dairy farm Scapular kinematics |
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