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The dynamic and static strength of whole body exertions in the human

Fothergill, David Mark; (1992) The dynamic and static strength of whole body exertions in the human. Doctoral thesis (Ph.D), UCL (University College London). Green open access

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Abstract

The characteristics of whole body manual exertions were investigated in both males and females under a wide range of conditions of posture, hand height, direction of exertion and task resistance. Many of these conditions were novel. The many factors which influence force exertion were reviewed and a computerized bibliography on human strength was prepared. Two experimental studies investigated the influence and interrelationships of hand/handle interface, gravitational and musculo-skeletal limitations on the ability to produce maximal static forces. A third study introduced novel strength testing equipment, protocol, data processing and display techniques in order to extend the measurement and analysis into three dimensions. A final study compared static lifting strength with maximal one and two-handed dynamic lifting performance against a range of resistances on an isoresistive hydrodynamometer. A good association was found between dynamic and static measures of whole body strength. However, different relationships between the two were observed in one and two-handed, and in male and female exertions. It was further concluded that dynamic and static measures of whole body strength cannot reliably be predicted on the basis of body weight and stature alone when the exerted force is directed along the line joining the foot and hand centroids. In other directions of exertion, where gravitational limitations play a more dominant role in the strength of exertion, reasonable predictions of whole body static strength may be obtained using a simple linear regression model with body weight and stature as independent variables. Extension of the Postural Stability Diagram into three dimensions and dynamic models of lifting strength based on the results are discussed as possible aids for task analysis in manual materials handling.

Type: Thesis (Doctoral)
Qualification: Ph.D
Title: The dynamic and static strength of whole body exertions in the human
Open access status: An open access version is available from UCL Discovery
Language: English
Additional information: Thesis digitised by ProQuest.
Keywords: Health and environmental sciences; Whole body strength
URI: https://discovery.ucl.ac.uk/id/eprint/10116969
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