American journal of physiology . :?- .ty^i.^^. Figure 5. — Top record, blood pressure withmercury manometer. IMiddle record,contractions of the tibiaUs anticus muscle240 times per minute against a springwith an initial tension of 120 gm. Bot-tom record (zerd blood pressure) injectionof cc. of adrenalin (1: 100,000). Timein half minutes. a spring having an initial tension ofI20 gm. and that in Fig. 6having an initial tension of loogm. In Fig. 5 the muscle was after-loaded and in Fig. 6 it wasloaded. The muscle lever magnified the contractions Fig. 5, at the point indicated on t
American journal of physiology . :?- .ty^i.^^. Figure 5. — Top record, blood pressure withmercury manometer. IMiddle record,contractions of the tibiaUs anticus muscle240 times per minute against a springwith an initial tension of 120 gm. Bot-tom record (zerd blood pressure) injectionof cc. of adrenalin (1: 100,000). Timein half minutes. a spring having an initial tension ofI20 gm. and that in Fig. 6having an initial tension of loogm. In Fig. 5 the muscle was after-loaded and in Fig. 6 it wasloaded. The muscle lever magnified the contractions Fig. 5, at the point indicated on the base line, cc. of ad-renalin (1:100,000) was injected into the left external jugularvein. There resulted a fall of 25 mm. of mercury in the arterial ^ Cannon and Nice: Loc. cit., p. 55. ^ Cannon and Lyman: this Journal, 1913, xxxi, p. 376. Fatigue Affected by Adrenalin and by Arterial Pressure 349 pressure and a concurrent bettermentof 15 per cent in the height of con-traction, requiring two minutes andfifteen seconds of fatigue befo
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