. Carnegie Institution of Washington publication. 30 METABOLISM DURING WALKING. MEASUREMENT OF THE STEP-LIFT. With each step in walking, the body is raised to a greater or less; degree in a vertical direction, and this becomes an appreciable factor in the amount of work which is done. In the previous research in this Laboratory on the muscular work of walking, a dual record of these movements was obtained by means of a work-adder wheel, the spring pointer introduced by Professor Carl Tigerstedt,1 and a kymograph record. The same method of measurement was used in this research (see fig. 7), exc
. Carnegie Institution of Washington publication. 30 METABOLISM DURING WALKING. MEASUREMENT OF THE STEP-LIFT. With each step in walking, the body is raised to a greater or less; degree in a vertical direction, and this becomes an appreciable factor in the amount of work which is done. In the previous research in this Laboratory on the muscular work of walking, a dual record of these movements was obtained by means of a work-adder wheel, the spring pointer introduced by Professor Carl Tigerstedt,1 and a kymograph record. The same method of measurement was used in this research (see fig. 7), except that the cord leading to the work-adder wheel was not attached directly to the subject. Instead, a light wooden fork was employed, which was 2 meters long and pivoted at one end, while the prongs were held closely at the subject's shoulders by elastic webbing. Fio. 7.—Step-lift recorder. T, cord fastened to fork at back of subject (see fig. 1, p. 19); A, spring providing tension on cord T; B, recording wheel revolved by the friction of cord T; C, laminated spring-steel pawl to prevent back-lash; D, pen for tracing record; E, signal magnet and pointer for recording (See S, fig. 1, p. 19.) The cord T (figs. 1 and 7) from the work-adder wheel was fastened to this fork at a point directly behind the subject's neck. Although this attachment was not so near the center of gravity of the body as it might be, the results obtained with it were very positive and showed such slight movements as shifting the weight of the body from one foot to the other—a movement scarcely noticeable to the observer—while it was less affected by the relative position of the subject on the treadmill. The work-adder wheel was directly con- 1C. Tigerstedt, Skand. Archiv f. Physiol., 1913, 30, p. 299. See special application of this pointer under the conditions of this research in Benedict and Murschhauser, Carnegie Inst. Wash. Pub. No. 231, 1915, p. Please note that these images are extra
Size: 1291px × 1936px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorcarnegie, bookcentury1900, bookdecade1900, bookyear1902
