The influence of thoracic posture and movement on range of arm elevation

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Abstract
The relationships between range of bilateral arm elevation, thoracic extension range used in this task and thoracic posture were examined in 60 normal females assigned to either younger or older groups. Arm elevation was measured with a Myrin goniometer and thoracic kyphosis and extension range by two inclinometers. The results indicate that bilateral arm elevation induced an average of 15 degrees and 13 degrees of thoracic extension in the younger and the older groups, respectively. This represented half of the available extension range in the young subjects, but nearly 70% of available range in the older subjects. A strong relationship was found between range of arm elevation and range of thoracic extension used in this movement in younger subjects. A large kyphosis was associated with reduced arm elevation in older subjects.

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