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Spine Loading and Trunk Kinematic Changes during Team Lifting

Two-person or team lifting is a popular method for handling materials under certain conditions. While many guidelines and standards address safe lifting limits for individuals, there are no such limits for team lifting and these lifts are poorly understood. The literature associated with team lifting offers some interesting paradoxes. Many studies have indicated that people lift less under team conditions compared to one-person lifting. Yet at least one study has reported an increase in team lifting capacity when subjects were height matched. This study explored the spine loading characteristics of one-person and two-person lifting teams when subjects lifted under several sagittally symmetric and asymmetric conditions. Spine compression was lower for two person lifts while lifting in sagittally symmetric conditions, whereas, lateral shear became much greater for two-person lifts under asymmetric lifting conditions. This study has linked these changes to differences in trunk kinematic patterns adopted during one verse two-person lifting.