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挤奶设备设计对美国大型奶牛场挤奶厅工人在设备连接过程中上肢肌肉活动的影响。

Effects of milking unit design on upper extremity muscle activity during attachment among U.S. large-herd parlor workers.

作者信息

Douphrate David I, Gimeno Ruiz de Porras David, Nonnenmann Matthew W, Hagevoort Robert, Reynolds Stephen J, Rodriguez Anabel, Fethke Nathan B

机构信息

The University of Texas Health Science Center at Houston, School of Public Health, San Antonio Regional Campus, TX, USA.

The University of Texas Health Science Center at Houston, School of Public Health, San Antonio Regional Campus, TX, USA.

出版信息

Appl Ergon. 2017 Jan;58:482-490. doi: 10.1016/j.apergo.2016.08.008. Epub 2016 Aug 24.

DOI:10.1016/j.apergo.2016.08.008
PMID:27633245
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7008452/
Abstract

BACKGROUND

Large-herd dairy parlor workers experience a high prevalence of musculoskeletal symptoms in the upper extremity. The purpose of this study was to evaluate the effect of milking unit design on upper extremity muscle activity during milking unit attachment.

METHODS

Upper extremity muscle activity was recorded among U.S. large-herd parlor workers (n=11) using surface electromyography. Participants performed several milking unit attachment cycles with each of six milking unit designs. Muscle activity levels were then compared between unit designs.

RESULTS

Mean muscle activity levels (in %MVE) across milking units ranged from 6.8 to 8.2 for the upper trapezius, 8.2 to 10.3 for the anterior deltoid, 13.8 to 17.2 for the forearm flexors, and 9.9 to 12.4 for the forearm extensors. Pairwise comparisons between milking units did not reveal statistically significant differences in muscle activity levels across milking unit designs. However, a general pattern of higher muscle activity was observed with specific milking units. Milking unit weight, milk tube spread, and teat cup shape may explain differences in muscle activity levels.

CONCLUSIONS

Milking unit design may influence muscle activity levels among parlor workers. Small reductions in muscle activity associated with milking unit design have the potential to delay the onset of fatigue or development of musculoskeletal health outcomes among parlor workers.

摘要

背景

大型奶牛场挤奶厅的工人上肢肌肉骨骼症状患病率很高。本研究的目的是评估挤奶设备设计对挤奶设备安装过程中上肢肌肉活动的影响。

方法

使用表面肌电图记录美国大型奶牛场挤奶厅工人（n = 11）的上肢肌肉活动。参与者使用六种挤奶设备设计中的每一种进行了几个挤奶设备安装周期。然后比较不同设备设计之间的肌肉活动水平。

结果

各挤奶设备上斜方肌的平均肌肉活动水平（以%MVE计）在6.8至8.2之间，三角肌前部在8.2至10.3之间，前臂屈肌在13.8至17.2之间，前臂伸肌在9.9至12.4之间。不同挤奶设备之间的两两比较未发现不同挤奶设备设计的肌肉活动水平存在统计学上的显著差异。然而，在特定的挤奶设备上观察到了肌肉活动较高的总体模式。挤奶设备重量、奶管间距和奶杯形状可能解释了肌肉活动水平的差异。

结论

挤奶设备设计可能会影响挤奶厅工人的肌肉活动水平。与挤奶设备设计相关的肌肉活动的小幅降低有可能延迟挤奶厅工人疲劳的发生或肌肉骨骼健康问题的发展。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1b9d/7008452/49b1cb90a851/nihms-1068529-f0003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1b9d/7008452/97d587f5661c/nihms-1068529-f0001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1b9d/7008452/aef1be439f25/nihms-1068529-f0002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1b9d/7008452/49b1cb90a851/nihms-1068529-f0003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1b9d/7008452/97d587f5661c/nihms-1068529-f0001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1b9d/7008452/aef1be439f25/nihms-1068529-f0002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1b9d/7008452/49b1cb90a851/nihms-1068529-f0003.jpg

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