Abstract
In a previous contribution, McKinley and I 1 described a new method for obtaining quantitative measurements of human muscle tonus. The principle of our technic is analogous to the usual clinical method of estimating tonus; that is, the resistance of resting, or at least voluntarily relaxed, muscles to passive stretch is determined. TECHNIC An arm of the subject to be tested is placed on a freely rotating arm rest which is driven in a horizontal position on a ball-bearing axis by the release of a weight. The internal condyle is carefully placed directly above the axis, and the forearm is passively extended or flexed by releasing a weight with a trip mechanism. The angular distance and the velocity of the moving forearm are recorded on a smoked drum with an electric time marker. To measure tonus under different conditions my associates and I have developed three methods, more or less
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