Wave-like variations in muscular fatigue curves / by C.T. Symons.

  • Symons, C. T.
Date:
[1908?]
Catalogue details

Licence: Public Domain Mark

Credit: Wave-like variations in muscular fatigue curves / by C.T. Symons. Source: Wellcome Collection.

    9/20 page 391
    conditions as in Fig. 1, i.e. with stimuli at the rate of about 20 per minute and a pause for a period of six stimuli. But such a pause and such a rate of stimulation are not essential. If only one stimulus be omitted, the waves are quite evidently shown (Fig. 5) without appreciable alteration of wave length. Fig. 5. Isolated frog’s gastrocnemius; direct stimulation; stimuli short-circuited for different periods as marked. m if. to Lf lo if- 19 *t- to It- to if. i9 Fig. 6. x -j. Isolated frog’s gastrocnemius; direct stimulation ; position of secondary coil as indicated, the numbers giving the distance in cm. between secondary and primary coils; the intervals at 10cm. represent sub-maximal contractions; those at 4 cm. were maximal when the muscle was fresh. This method of pauses provides the muscle with time for recovery between each active period, and as the contractions during activity were maximal, it was thought that, by replacing the pauses by periods of sub- maximal contractions, the waves could still be produced. This was shown to be the case, and not only did the waves appear during the maximal periods, but also showed signs of appearance during the sub-
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