rate of breathing on walking slowly
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Finally, we have rates obtained immediately prior to, during, and after walking. Inasmuch as the subjects during the walking experiments were confined inside an air-tight metal box, it was impracticable to use the ordinary methods of graphic registration to determine the respiration rate. Recourse was thus had to the special technique outlined on page 130 of this report. Although in a preliminary test it was possible so to adjust the technique for the individual subjects as to obtain most satisfactory records, in the actual experiments we were able to adjust the subject for only a moment, and the experiment was then immediately begun without opportunity for subsequent adjustment. As a result, much to our regret, a considerable number of the records are illegible. This frequently happened with the records of a particular subject, indicating that the difficulty was in the adjustment for that especial man.
The respiration rate is commonly recorded in respirations per minute, and we have followed this custom in presenting the previous data. In the records with the treadmill chamber, however, we were unable to count the number of respirations, as was possible from the graphic records obtained from the pneumograph around the chest in the experiments with the respiratory-valve apparatus, or to record the rise and fall of a spirometer as in the experiments with the portable respiration apparatus. It was necessary to depend here upon short photographic records; consequently the actual number of respiration cycles counted was, at times, rather few and the few records had to be multiplied to bring them to the per minute basis. While the pulse-rate may be advantageously counted for 30 seconds or even as low as 20 seconds, and raised to values per minute without serious error, it is a legitimate question as to whether or not it is possible to count 4, 5, or even less respiratory cycles, determine the length of time photographically to 0.01 part of a second, and then raise this to a rate per minute on the assumption that the regularity of breathing would be the same throughout the rest of the minute. In lieu of longer records it has been necessary to do this. The results obtained by the photographic method are therefore recorded only to whole numbers in table 110, in which the values are given for the respiration rate with the subject standing before walking and those found 1, 6, 12, 24, and 26 minutes after the walking began. A few records taken at other intervals are given in footnotes. Finally, a few values are recorded 22 minutes. 25.
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Finally, we have rates obtained immediately prior to, during, and after walking. Inasmuch as the subjects during the walking experiments were confined inside an air-tight metal box, it was impracticable to use the ordinary methods of graphic registration to determine the respiration rate. Recourse was thus had to the special technique outlined on page 130 of this report. Although in a preliminary test it was possible so to adjust the technique for the individual subjects as to obtain most satisfactory records, in the actual experiments we were able to adjust the subject for only a moment, and the experiment was then immediately begun without opportunity for subsequent adjustment. As a result, much to our regret, a considerable number of the records are illegible. This frequently happened with the records of a particular subject, indicating that the difficulty was in the adjustment for that especial man.
The respiration rate is commonly recorded in respirations per minute, and we have followed this custom in presenting the previous data. In the records with the treadmill chamber, however, we were unable to count the number of respirations, as was possible from the graphic records obtained from the pneumograph around the chest in the experiments with the respiratory-valve apparatus, or to record the rise and fall of a spirometer as in the experiments with the portable respiration apparatus. It was necessary to depend here upon short photographic records; consequently the actual number of respiration cycles counted was, at times, rather few and the few records had to be multiplied to bring them to the per minute basis. While the pulse-rate may be advantageously counted for 30 seconds or even as low as 20 seconds, and raised to values per minute without serious error, it is a legitimate question as to whether or not it is possible to count 4, 5, or even less respiratory cycles, determine the length of time photographically to 0.01 part of a second, and then raise this to a rate per minute on the assumption that the regularity of breathing would be the same throughout the rest of the minute. In lieu of longer records it has been necessary to do this. The results obtained by the photographic method are therefore recorded only to whole numbers in table 110, in which the values are given for the respiration rate with the subject standing before walking and those found 1, 6, 12, 24, and 26 minutes after the walking began. A few records taken at other intervals are given in footnotes. Finally, a few values are recorded 22 minutes. 25.
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