. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 400 K. GKLLHORX more the fatigue increases. That is, of course, to be expected, since recovery is more marked in a slightly fatigued muscle than in one which has been very much fatigued. Thus the phenomenon is un- doubtedly a recovery contracture and the question arises as to what factors are responsible for its occurrence. II. TlIE INFLUENCE OF STRENGTH, FREQUENCY, AND DERATION OF STIMULI ON THE OCCURRENCE OF RECOVERY CONTRACTURE SyMematic studies showed that the recovery contracture is rather independent of the strength of
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 400 K. GKLLHORX more the fatigue increases. That is, of course, to be expected, since recovery is more marked in a slightly fatigued muscle than in one which has been very much fatigued. Thus the phenomenon is un- doubtedly a recovery contracture and the question arises as to what factors are responsible for its occurrence. II. TlIE INFLUENCE OF STRENGTH, FREQUENCY, AND DERATION OF STIMULI ON THE OCCURRENCE OF RECOVERY CONTRACTURE SyMematic studies showed that the recovery contracture is rather independent of the strength of the stimuli since it occurs in experi- ments with submaximal as well as maximal condenser discharges. This makes it plain that the contracture is different from Tiegel's contracture, which requires the application of supermaximal currents. However, the frequency of stimulation had a marked influence. Kxperiments were carried on in which the frequency of stimuli in the first and second periods varied independently over a range of from 30 to 150 per minute. It was apparent that at least 45 stimulations \\ere required in the first period to bring about the contracture in the second, provided that during this period the frequency was at least one hundred. Under these conditions, the higher the fre- quency employed in the second period, the more marked the con- tracture. But this is true only up to a frequency of 120 per minute, -•ince beyond this value the contracture dropped slightly. It is easily understandable that stimulations below 45 per minute (luring the lust period did not produce a recovery contracture in the second even if very high frequencies were used, since under these conditions in the first period no fatigue was observed. Therefore, a recovery phenom- enon must fail to appear. In general it may be said that the higher the frequencies used in both periods, the more marked the recovery. But even after a first period of hiirh frequency the contract lire does not oc
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