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Biomedical subjects

C G Drury

Publications and source records attributed to C G Drury.

At least 19 recordsLinked to original sources
PubMed1995

Visually-controlled leg movements embedded in a walking task.

Accurate control of alternating leg movements in walking was considered as a visually controlled target aiming task. Nine subjects aimed alternate feet at targets along a walkway, using nine combinations of amplitude and target width giving index of difficulty values between 2.59 and 6.16. Movement time was compared to the same subjects performing reciprocal tapping tasks with arm and leg. Alternating target aiming tasks were the most rapid of all tasks studied. Explanations of this effect in terms of learning and elimination of direction changes were consistent with the data from all conditions. Visual control can be expected in normal walking only for target sizes smaller than about 300 mm, i.e., under unusual accuracy requirements.

Adult↗
PubMed1989

Symmetric and asymmetric manual materials handling. Part 1: Physiology and psychophysics.

To study the physiological and psychophysical costs of symmetric and asymmetric manual materials handling, two tasks were performed by 30 industrial subjects. In both tasks, box weight and handle position were varied. The symmetric task, lifting and lowering between floor and conveyor, showed handles to be beneficial. The asymmetric task was palletizing and depalletizing 36 boxes between a pallet and a conveyor. Both palletizing and depalletizing proved strenuous for females with heart rates exceeding 140b/min. All handle positions were better than No Handles, but the best handle position changed from asymmetric for 9 kg boxes to symmetric for 13 kg boxes. The effect of handles was equivalent to a weight change of 1-2 kg for Heart Rate and Rated Perceived Exertion, but much higher (2-14 kg) for Body Part Discomfort measures.

Adult↗
PubMed1989

Symmetric and asymmetric manual materials handling, Part 2: Biomechanics.

Earlier studies of the biomechanics of handle placement and angles on boxes in Manual Materials Handling have been limited to sagittally symmetric tasks. This study extends the results to a palletization/depalletization task with considerable asymmetric movement. Part 2 shows how body posture, hand/handle interface, and disc compressive force change in this asymmetric task. The results were not too different from the earlier studies of symmetric tasks, except that a 'traditional' handle position in the upper part of each lateral face (the 2/2 position) proved more effective than had been anticipated.

Adult↗