Abstract
Comparisons of the EMG and myogram responses in a phasic stretch reflex between normal resting tension (control) and three pre-strain conditions show that (i) there is a positive, linear relationship between these two variables but the correlation coefficient decreases with increase in force of pre-strain, (ii) when the relationship is plotted, the regression lines for control and pre-strain separate but the slopes for the regressions are not dissimilar, (iii) there is a progressive decrease in the variance of responses with increase in force of pre-strain and (iv) there is a high product-moment correlation coefficient between the peak force of the myogram and the area of the myogram. Explanations for these results are discussed in terms of muscle spindle physiology.
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