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Biomedical subjects

D Liddell

Publications and source records attributed to D Liddell.

4 recordsLinked to original sources
PubMed1979

The initiation of gait.

The initiation of gait was studied utilizing electromyography, force-plate data, measurements of walking velocities, and ranges of motion of joints, all of which demonstrated that gait is initiated by the body becoming unbalanced in such a way as to permit a subject to pick one foot the ground in order to take the first step. The subsequent transition of the body to the steady gait pattern occurs rapidly over a period of appproximately three steps. This transition involves rapid changes in the measured forces and activities of the muscles of the lower extremity and the motion of the joints reflects these changes.

Adult↗
PubMed1975

Radiological changes over 20 years in relation to chrysotile exposure in Quebec.

Radiological changes in 267 male Quebec chrysotile mine and mill workers, each with five chest films spanning an average of 20 years, were related to age, smoking habit, mining area, duration of employment and average dust concentration before and between films. (1) Abnormality in the earliest film was related mainly to the time since first employment. (2) In 45 (30%) of the 150 men completely normal at earliest film, some radiological abnormality developed during the period of observation: incidence was weakly related to age; in Asbestos, the risk of developing small opacities was lower in smokers than in non-smokers. (3) There was an irregular pattern of correlation, more evident in Thetford Mines than in Asbestos, between radiological progression and various stimulus variables. That associations between radiological responses and measures of asbestos exposure were, as always, weak, despite powerful methodology, indicates that effects are obscured by other factors (including susceptibility) uncorrelated with exposure.

Adult↗