File:American journal of physiology (1898) (14783125535).jpg

Identifier: americanjourna33ameruoft (find matches)
Title: American journal of physiology
Year: 1898 (1890s)
Authors: American Physiological Society (1887- ) American Physiological Society (1887- ). Abstracts of papers presented at the fall meeting American Physiological Society (1887- ). Proceedings
Subjects: Physiology Physiology
Publisher: (Bethesda, Md., etc.) American Physiological Society (etc.)
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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(4) Threshold five minutes after an in-jection of 0.2 cc. of adrenalin (1:100,000)without previous fatigue. (5) Thresholdafter one hours fatigue. The musclecontracted 120 times per minute againsta spring having an initial tension of120 gm. (6) Threshold five minutesafter an injection (0.1 cc.) of adrenalin(1:100,000). (7) Threshold five minutesafter another injection of adrenalin (0.5cc. of a 1:100,000 solution). 340 Charles M. Gruber the other from the muscle directly, served to show that there wasno fault in the electrodes. The continuous line in the curve repre-sents the threshold (in (S units) of the muscle, the broken line thatof the nerve-muscle. The threshold of the nerve-muscle is magnifiedICG times in Fig. i and lo times in Fig. 2. In Fig. i (at 2 and4) the threshold was taken after an intravenous injection of o.i and0.2 cc. of adrenalin respectively. These examples show that adrenalin does not affect the thres-hold of the normal non-fatigued muscle when taken either from the
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:30 1 1:30 2 2:30 3 3:30 4 4:30 Figure 2. — A curve plotted from the data of one experiment. Thetime interval inhours and minutes is represented on the abscissa; the value of the threshold in/3 units is represented on the ordinate. The continuous line is the curve of themuscle, the broken line that of the nerve-muscle. The curve of the nerve-muscleis magnified ten times; that of the muscle is normal. (1) Normal threshold stimulus. (2) The threshold after one hours fatigue. Themuscle contracted 120 times per minute against a spring having an initial tensionof 120 gm. (3 and 4) Thresholds after rest; after 60 minutes (3), and after 90minutes (4). (5) Threshold five minutes after an injection of adrenalin (0.1 cc.of a 1:100,000 solution). (6 and 7) Thresholds after rest; after 60 minutes (6),and after 90 minutes (7). muscle directly or from the nerve-muscle. In Fig. i (at 3) thethreshold was taken after two hours rest. This confirms E. L.Porters observation that the threshold may remai

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