Les principes de contrôle sanitaire . n du passage de onefoot alternativement à l'autre, et le travail de pliage, redressage, andtwisting asnearly le tronc accompli que possible par les muscles sur-l'arrondissement l'abdomen. Dans practicingthis strainand on devrait éviter d'exercice ne doit jamais porter à la extentof causant la douleur dans l'une des abdomi-nal ou des organes pelviens. La respiration diaphragmatique. - Dans l'utilisation du diaphragme dans la respiration périodique,la pression est exercée sur thestomach displacesthese et foie qui improvesthe verticalement les organes et la circulation dans la région abdominale.Le foie espe

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The principles of health control . ight alternately shifting from onefoot to the other, and the work of bending, straightening, andtwisting the trunk accomplished asnearly as possible by the muscles sur-rounding the abdomen. In practicingthis exercise one should avoid strainand should never carry it to the extentof causing pain in any of the abdomi-nal or pelvic organs. Diaphragmatic Breathing. — In theuse of the diaphragm in breathing, periodic pressure is exerted upon thestomach and liver which displacesthese organs vertically and improvesthe circulation in the abdominal region.The liver especially is supposed toderive benefit from its excursions andfrom the massaging effects of thediaphragm upon it, and these effects, together with the effect of full breath-ing upon the chemical processes, makesdiaphragmatic exercise a positive aid inpreventing and overcoming constipation. The Exercise of Laughing. —Laughing has long been recognized asan aid in digestion, the adage laughand be fat being some hundreds of years old.. Fig. 40.— The Figure Eight Exercise. This ex-ercise is especially valuablefor developing the abdominalmuscles (Fig. 37) and forstimulating peristalsis. Through the rapidup-and-down movements of the diaphragm in laughing, the liveris given a shaking which it gets in no other way. In addition tothis, laughter relieves nervous tension which is a hindrance to theprocesses of digestion. Cure through Posture. — The maintenance of correctposture should, for many reasons, be ranked first amongthe agencies for the relief of constipation. Importanceshould be attached to the fact that it is a continuouslyacting cause and that it serves other essential purposes.To apply the principle one needs only to put into practice 178 PRINCIPLES OF HEALTH CONTROL what has already been learned (Chapter V) relative toproper positions in sitting, standing, and walking. Whilethe head should be erect, the chin slightly depressed, the neck back, and the shoulders flat, the mor

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