Letter of application and précis of contributions to physiology of / Augustus D. Waller.

  • Waller, Augustus Désiré, 1856-1922.
Date:
1895
Catalogue details

Licence: Public Domain Mark

Credit: Letter of application and précis of contributions to physiology of / Augustus D. Waller. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    Duration of Systole and of Diastole with Different Pulse-frequeDcies. ration in hundreds of a second 100 f ■ •90 Pulse-frequencies per minute are indicated along the abscissa. Durations of systole and of diastole are given in hundredths of a second. Their respective curves show that the systole shortens by about T 6JJ second for each increase of 10 beats per minute, and that the diastole shortens by about second. The shaded and unshaded portions represent respective time of work and time of rest at various pulse-frequencies. Pulse-frequency per minute Duration of systole in hundredths of a second Duration of diastole in hundredths of a second Ratio of systole to cardiac cycle Hours of work per diem 50 37 83 •31 7'5 00 34 60 •34 8-2 70 32 54 •37 8-9 80 30 45 •40 9-6 00 28 38 •42 10-2 100 27 33 •45 10-8 V. On Musculae Spasms known as Tendon-Reflex. Brain, 1880, p. 179. Evidence by time-measurements that the phenomenon is not (as was then generally believed) a reflex action, but a direct muscular response of which a necessary condition A 3