Exercise in education and medicine / by R. Tait McKenzie.

  • R. Tait McKenzie
Date:
1909
Catalogue details

Licence: Public Domain Mark

Credit: Exercise in education and medicine / by R. Tait McKenzie. Source: Wellcome Collection.

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    ears, dizziness, and a feeling of suffocation, while accompanying the thirst for air is mental anxiety, confusion, and even uncon¬ sciousness. The facial expression of the breathless man has been already described. This physical distress is preceded by a period of stimulation in which the eye becomes bright, the skin flushed, and a warm glow is felt from the dilatation of the capillaries. This dilatation of the capillaries is a sign of the increased power of the heart-beat, 3 i 2 Fig. io.—Stanton’s sphygmomanometer: i, Leather cuff in place on the arm; 2, bulb grasped in hand for pumping air into the tube under the cuff to obliterate the pulse ; 3, glass tube graduated to show the height of the column of mercury required (Da Costa). which exalts the tension throughout the whole arterial system and drives the blood with quickened stream through vessels which at rest are almost empty. Blood-pressure is also raised by any obstruction of its return to the right side of the heart. The causes of raising or lowering it will be considered more fully in an analysis of the influence of exercises of effort and endurance on the circulation. The measurement, then, of arterial tension is exceedingly important. This is done by a sphygmomanometer, such as Stan-