Sun baths are especially effective as a means of stimulating activity of the skin, and promoting elimination. Sun baths likewise have a very powerful influence upon the entire organism inasmuch as they stimulate metabolism or cell-activity. They directly affect the circulation and promote the formation of red corpuscles. The sun is the centre of all energy and life upon this earth. It is our great vitalizing and life-giving principle, both in the realms of animal life and plant life. It is only natural, therefore, that sun baths should have a profound influence upon the body.
A word of caution, however, is required because of the tremendous power of the sun and its powerful chemical effect when sun bathing is carried too far. Those of very fair skins particularly need to be careful. Brunettes, with considerable pigment of the skin can stand a great deal of sunlight without harm, but light-skinned persons, while needing a certain amount of sunlight, should not expose themselves for too long a time to the midday sun in summer, or at least not until they have gradually become sufficiently tanned to do so. Everyone knows the painful character of a sunburn. This only illustrates the powerful chemical effect of the sun's rays. In taking sun baths one should very gradually accustom himself to the sunshine until he is so tanned that the pigment in his skin will protect him. The short or chemical rays of the sun are actually destructive to white men in the tropics. In May, June and July they have a pronounced chemical effect even in our own latitude. They are stimulating up to a certain point, but beyond that point one should be careful. I may say, therefore, that brunettes in summer may take sun baths even at noon, but blondes should take them preferably before nine or ten o'clock in the morning or after three o'clock in the afternoon. In winter, however, when the sun's rays are more slanting, the sun baths can be taken even by the blondes at any time. And because of the more limited amount of sunlight in winter, special attention should be given to sun bathing during that season.
Everyone needs a certain amount of sunlight, and if you cannot take a sun bath regularly every day you should at least wear clothing of a character that will permit the light-rays of the sun to penetrate. I will refer to this again, however, in the chapter on the subject of clothing.
After all that we can say in regard to these various methods of stimulating the skin there is really nothing so effective as active exercise for those who are strong enough to take a sufficient amount of it. Exercise, so far as function of the skin is concerned, is valuable because of the copious perspiration which is induced when one gets enough of it. In these days great numbers of people no longer "earn their bread by the sweat of their brow," and their health suffers in consequence. If you do not have to perform such an amount of physical labor as will promote free perspiration, then for the sake of acquiring the very purest quality of blood your special exercise should be sufficiently active and continuous to bring about free perspiration. There is really nothing so effective as a good old-fashioned "sweat" for rapidly purifying the blood. Anyone who perspires each and every day as a result of physical activity, and whose habits are fairly satisfactory in other respects, can depend upon enjoying absolutely pure blood, or a condition which is not far from it.
It does not matter what form of physical activity is employed to bring about this result. It may take the form of work that is useful and productive in character, or it may be play that is sufficiently active to cause deep, free breathing and bring out the perspiration. For those who are vigorous enough, cross-country running, wrestling, boxing, tennis and other games which involve real muscular effort continued for some time, will all prove satisfactory for this purpose. If you are anxious to purify your blood in cold weather it might be well to wear a good heavy sweater while taking such exercise in order to maintain a marked degree of warmth and thus bring out the perspiration in plentiful quantities. It is always well to avoid becoming chilled too quickly after exercise of this kind.
It is not alone in stimulating the eliminative function of the skin that exercise has a blood-purifying effect; it accelerates all the functions of the body, it stimulates greater activity of the lungs and of the kidneys. It promotes such an active circulation through all the minute structures of the body that accumulations of waste and dead matter are taken up and swept on to be thrown out through the natural channels of elimination. Under conditions of physical stagnation, when the circulation is less active, much of this waste matter tends to remain in the tissues of the body, accumulating and interfering with cell activity and normal functioning in general. The vigorous circulation of the blood induced by exercise gradually has the effect of flushing out all of the bodily tissues, and in that way has an internal cleansing effect that cannot be attained by any other means. In another chapter I have referred to the powerful influence of the drinking of hot water in connection with exercise as a means of promoting a more free circulation, but exercise under any circumstances tends to the same result, and for this reason as well as because of the perspiration brought about, exercise must be regarded as perhaps the most important of all measures for blood purification. No man can be continuously healthy without exercise. No man or woman can be internally clean, in the strictist sense, without a proper amount of daily exercise.
However, for those who are not strong enough to take a large amount of exercise, and who cannot in this way bring about free perspiration, other methods of accelerating the activity of the pores of the skin may be employed. I have already referred to the influence of air baths, friction baths and sun baths. Remember that through these agencies the pores may be made very active without any apparent result in the form of liquid perspiration, for under ordinary conditions perspiration evaporates and the body may not become wet. It is only when one perspires very rapidly that perspiration is manifested in the moistening of the skin. When taking your air baths there may be marked activity of the skin without any appearance of "sweat."
Various forms of bathing have the effect of inducing rapid elimination. Russian and Turkish baths are commonly used for this purpose, and every "man about town" knows the value of Russian and Turkish baths as a means of clearing his system and even of "clearing his head" through the profuse perspiration induced by the treatment. There is no question that these baths are effective in this direction, though it may be said that they are only a poor substitute for daily exercise as a blood-purifying measure. The man who neglects his requirements in the way of physical activity may strive to make up for it by a Turkish bath, but cannot get the same results, although it is true he can accomplish a great deal in this way. The great objection to Turkish and Russian bath establishments is to be found in the unsatisfactory ventilation usual in such places. As a rule the Russian or vapor bath is to be preferred to the Turkish, or dry, hot air. Especially if one is not very strong the steam bath is preferable. If one is vigorous, however, and has a strong heart, the dry hot air room will be very effective. Naturally the "rubbing" and other adjunctive treatment in the Turkish bath establishment are all beneficial.
The influence of these measures (the Russian and Turkish baths) in purifying the blood may be secured at home through the agency of other baths. A cabinet bath in the home will be equally effective in providing either a steam bath or a dry, hot-air bath. Naturally, a shower, or at least a quick sponging with cold water, should follow all such baths. If there is no bath cabinet in the home beneficial results can be secured by means of a hot-water bath. Hot water has a profound influence upon the elimination of wastes and impurities through the skin. In cases of kidney disease, where the kidneys are unable to perform their work, it is often possible to keep one alive by making the skin do the work of the kidneys through frequent hot baths. The tub should be filled with hot water at a temperature of from 105 up to 112 or 115 degrees Fahrenheit, that is to say, as hot as it can be endured, and one should remain in this bath from ten to twenty minutes, or as long as one's condition will permit. It may be a good plan to get into the water at a lower temperature, for instance, starting with water at 102 to 104 degrees, then afterwards adding hot water so as to raise the temperature to 108 or 112 degrees, or even higher. It is really necessary to use a bath thermometer (they can be obtained at a cost of ten or fifteen cents in any drug store) to regulate the temperature of the water. Sufferers from any derangement of the heart or those handicapped by serious vital depletion should not use the water too hot. In such cases it may be well to limit the temperature to 103 to 105 degrees and to limit the duration of the bath to five or ten minutes. In such cases it will be necessary to take the bath more frequently, perhaps each evening, in order to secure results in the way of active elimination. If one is strong enough, however, and merely wishes to purify the blood one may be able to stay in the water from twenty to thirty minutes and to raise the temperature of the bath to 115 degrees or more. The hot bath is much used in Japan and the natives there almost parboil themselves, using water at a temperature as high as 120 degrees. But it is not necessary to go to such extremes. It is most important that one should leave the bath immediately upon feeling any sense of weakness, dizziness or discomfort of any sort. If you feel oppressed by a sense of overheating, do not linger in the water but get out of it immediately. You will usually find that your face will perspire freely within a few minutes after being in the bath. This indicates its rapid eliminative effect. Such a bath will not accomplish exactly the same work as a cabinet or Turkish bath, but good results can be secured therefrom. The hot bath when used for perspiration purposes should be followed by a quick sponging with cold water or by a cold shower. An excellent plan is to have conveniently at hand what is called a hand spray, attached to a long rubber tube. By attaching this to the faucet and turning on the cold water one may quickly spray all parts of the body while standing in the tub of hot water. Finally, the feet may be sprayed with cold water on getting out of the tub. Rub dry quickly and thoroughly with a rough towel, after which wrap up warmly so that you may continue to perspire. It is most essential that one should not cool off too quickly and certainly that one should not become chilled after a bath of this sort. This hot bath is rather strenuous treatment, but it is effective, if one is strong vitally, for rapidly purifying the blood and eliminating the poisons in the body in any toxemic condition. It will be found valuable in the case of grippe or of a bad cold, in syphilis, or in any other disease characterized by a poisoned condition of the system and in which there is no fever present. In the case of fever, which also invariably involves a toxemic condition of the body, the elimination of the poisons through the skin should be accomplished by methods which do not involve the external use of heat in this manner.
Wet-sheet packs, both of the entire body and of parts of the body, are among the most effective of rapid blood-purifying measures. Frequently where one is confined to bed a hot-blanket pack will answer the same purpose as the hot bath just described. Where there is high fever a cold wet-sheet pack may be employed. This will relieve the high temperature to a marked extent, and will also eliminate the poisons of the body in a most remarkable way. The sheet pack is applied by first wringing one or two sheets out of cold water and then wrapping them completely around the naked patient, with the exception of the head. If a single sheet is used the flap on one side may be wrapped around the body under the arms and the flap from the other side passed over the outside of the arms. The patient should then be wrapped up thoroughly with warm blankets, fastened with safety pins.