Changes in heart-rate, blood-pressure, and duration of systole resulting from bicycling / by Wilbur P. Bowen.

  • Bowen, Wilbur Pardon, 1864-1928
Date:
[1904?]
Catalogue details

Licence: Public Domain Mark

Credit: Changes in heart-rate, blood-pressure, and duration of systole resulting from bicycling / by Wilbur P. Bowen. Source: Wellcome Collection.

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    The pulse-rate and blood-pressure were taken before, during, and after thirty different working periods on the bicycle. These working periods were of various lengths, the longest being fifty minutes, and the shortest three minutes. In eighteen of the working periods the duration of systole was determined at intervals of one minute or less, in addition to the other items. Three men served as subjects: H., a chemist, age forty-five; B., a teacher, age forty; and L.,a physician, age twenty-five. All these men were in good health at the time, but none was in “training.” B. and L. had been accustomed to athletic work in previous years. Successful records were obtained from H. during thirteen working periods; from B. during eleven, and from L. during six periods. 210 144 144, erie T i | l =i > | ae ae | SSS a fa ane i pa | | | | | mes 188 + t ae Sel } | erie | naa) | | | | ae ee el (i be | Nees | | | | A ox oe) el el a T cau al elimi aa raeein | | | Blood 182—————_++ +4 = imei ea j ttl a a cg eee, ane < awl hi Ft | eel Pressure — eae | Sie at eTLareatas t att | | e | es Ea EERIE iy ok Ul es Kae 230 126 laaast = ror ite= es morryet Ht t i; ‘a aa — p jal | ia eS ie il i | rs fe [ene | | | ‘|i ; ' | | ea) ea 220 12014 Lat FI padcame | | ‘\ ae | ow | | | i i al lip r ] ima ahaa ee Bal Bes 200 108/44 190 1024 180 96 Hi@, 524 Minutes.9 5 1S 2O 25 80 3835 40 FIGURE 2.— Plotted curves showing relative changes in pulse-rate and blood-pressure during thirty-two minutes of work and the thirty minutes of rest following. P (broken line), pulse-rate ; & P (solid line), blood-pressure. Arrows indicate the time of beginning and stopping the work. Experiment made July 8, 1903. Subject, Hf; speed, one revolution of cranks per second; work, 400 kilogram-metres per minute. The blood-pressure readings were written on the smoked paper, in sie proper place, aS fast as they were taken (see Fig. 1). After completing the experiment and fixing the curves, the pulse-rate was counted for each interval of ten seconds, and also written on the paper. Both sets of figures were then plotted as in Fig. 2,-— time
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