KINEMATIC ANALYSIS OF MINE EMERGENCY RESCUE PERSONNEL DURING THE PULL-DOWN STRENGTH TESTER EXERCISE

The objective of this research was to explore the kinematic characteristics of the elbow, shoulder, hip, and knee joints of mine emergency rescue personnel during the pull-down strength tester exercise. A Fastmove markerless 3D motion capture system was used to collect kinematic data from the elbow, shoulder, hip, and knee joints of 10 rescue personnel performing the pull-down strength tester exercise. As the movement phases progressed, the duration of the pull-down phase 2, the total pull-down phase, the return phase, and the full cycle all increased significantly ([Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text]). The angle of the elbow joint at the hammer’s lowest point, highest point, and minimum angle all increased significantly ([Formula: see text]). The angle of the shoulder joint at the hammer’s highest point increased significantly ([Formula: see text]), while its range of motion decreased significantly ([Formula: see text]). The angle of the hip joint at the hammer’s highest point decreased significantly ([Formula: see text]), while its range of motion increased significantly ([Formula: see text]). The average ([Formula: see text], [Formula: see text]) and peak ([Formula: see text], [Formula: see text]) angular velocities of the shoulder joint both decreased significantly during the pull-down and return phases, respectively. The average ([Formula: see text], [Formula: see text]) and peak ([Formula: see text], [Formula: see text]) angular velocities of the hip joint both increased significantly during the pull-down and return phases, respectively. The peak angular velocity of the knee joint increased significantly during the pull-down phase ([Formula: see text]). The pull-down strength tester exercise is a periodic, closed-chain movement with a simple action structure and multi-joint coordination, with its kinematic characteristics mainly being the flexion and extension of the elbow, shoulder, hip, and knee joints. As the number of repetitions increases, the force output efficiency of the rescuers’ upper limbs gradually decreases, while the compensatory force from the trunk and lower limbs progressively increases. This leads to a gradual change in the movement pattern, increasing the risk of injury to the lower back, elbows, and shoulders.