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In order to evaluate the development of muscle fatigue during drilling operations in the hand-over-head posture，a simulated drilling test was conducted to measure the maximum voluntary contraction (MVC) of muscles before the test，the maximum residual muscle strength (MRF) after the test，the degree of strength output attenuation (ΔF)，and ratings of perceived exertion (RPE) of wrists，elbows，and shoulders. MET was recorded. By setting different combinations of three operating surfaces (front，side，and bottom) and three operating heights as experimental variables，the effects of different operating methods on muscle fatigue during drilling operations under hand head posture were compared. Subsequently，the effects of three operating surfaces (front，side，and bottom) and three operating heights on MET，MRF，ΔF，as well as RPE of wrist，elbow，and shoulder were analyzed. Research has shown that using frontal manipulation and reducing arm lift height can effectively alleviate muscle fatigue. Different operating surfaces significantly affect MET，MRF，and ΔF，as well as RPE of the wrist，elbow，and shoulder. Different operating heights significantly affect MET，MRF，and RPE of the elbow. MET prediction model established in this article can reflect the muscle fatigue status of personnel during drilling operations in the hand-head posture.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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