Body Movements in Climbing a Ladder

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Abstract
Descriptions are given of the following movements of the body during the action of climbing a ladder: displacement and rotation of the pelvic gridle and trunk and rotation of the knee and hip joints. The descriptions are derived from cine records of a laboratory experiment in which 35 men climbed a ladder set at 2 angles: 70.4.degree. and 75.2.degree. with the horizontal. A comparison is made with the actions of the walking stride. At the steeper ladder angle, the hands played a greater part in maintaining the balance of the body and there were greater differences between the movement patterns of tall and short subjects. These, in turn, suggested a decreased stability of the body and increased deviation from the average pattern of movement. This may have a bearing on the kind of ladder accident in which the man slips or misses his footing.

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