Foot pressure measurement: a review of methodology.
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Biomedical subjects
Publications and source records attributed to M Lord.
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The use of a pedobarograph for gait studies offer a rapid method to obtain instantaneous, two-dimensional images of foot-loading, which can be made available immediately to the clinician for qualitative inspection. The system can also produce quantitative results with a dynamic bandwidth sufficient for the study of most features of load transference. Although the linearity and resolution of force level may be inferior to that obtained by other methods, the spatial resolution is superior.
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The location of muscle spindles is such that the length transduced by their end-organs may not represent the total 'origin-to-insertion' length of the muscle. The tendons at least lie in series with the spindles. Using a muscle model based on biceps brachii in man, a length-control senrosystem utilizing feedback either from the total muscle length, or from the 'internal length' of the contractile central region, is modelled on the analog computer. The difference in the nature of the closed-loop regulatory system thus achieved is demonstrated. Anomalous behavior is seen, in that as the length feedback becomes effective the total system response approaches that of a simple mass/spring system in one instance.
A supplemental table of sodium chloride equivalents and freezing-point depressions at various concentrations for 44 different substances in aqueous solution is presented. Also given in the table is the isosmotic concentration of each material that can form such a solution. The degree of hemolysis of human erythrocytes was determined in 24 different isosmotic solutions, and the data are presented in a table to supplement the previously pub lished values. Eleven isosmotic solutions prevented hemolysis, and 13 others failed to prevent hemolysis.
The present study investigated the hypothesis that preschool children who spend more time in social play than in non-social play would be more field-dependent than their field-independent counterparts. Over-all the hypothesis was supported by the results. Although the social-non-social dimension appeared to account for most of the findings, correlations between individual play activities and field dependence suggested that this single dimension could not adequately account for all of the findings. The dimension of perceptual-motor demand required in some of the activities may have been involved as well. Discussion focused on the complexity of the play preference, cognitive findings, and on sex differences as well.
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