Frank Pierce Jones

Postural set and overt movement: a force-platform analysis.

If the postural set is altered by changing the habitual balance of the head during a movement performed against gravity, the subjective feeling of weight can be markedly reduced. For the movement from sitting-to-standing an objective record of force distribution corresponding to the differences in feeling tone reported by S has been obtained with a strain-gauge force platform. The force platform appears well adapted for studying the relation between postural set and overt movement.

Heart Rate and Small Postural Changes in Man

Heart rates of eleven normal male subjects were recorded in a number of different sitting and standing postures. Three of the sitting postures were recorded both with and without an attention-demanding task. Heart rates differed significantly among many of the postures but not between task conditions.

Fatigue Effects on Patterns of Movement

The standing broad jump and four other gross body movements were analysed by colour-coded multiple-image photography before and after three kinds of fatigue-inducing exercise. For each movement marked individual differences in style of performance were found which tended to persist despite the effects of fatigue. Certain linear and angular measures taken from the movement patterns proved to be sensitive to fatigue effects. The amount and significance of change in the different indices varied with the method used for inducing fatigue.