Static work elements and selected circulatory responses

It has been recommended that circulatory responses be used as measures of circulatory stress and as a basis of work-rest scheduling. The purpose of this paper is to show how statistical models can be developed and used to describe selected circulatory responses associated with static work elements. Heart rate, mean arterial pressure and cardiac work were modeled as functions of work duration and intensity for four subjects performing sustained static group exertions to exhaustion at 12.5%, 25%, 50% and 75% of maximum strength. Examples and considerations of predicted circulatory responses to static work elements are discussed.