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But having the precursors present is not enough. Growth hormone is only manufactured under certain, specific circumstances: for about one hour immediately after going to sleep and then only if the blood supply is rich with argenine and ornithine but contains few other amino acids; it is also manufactured during heavy aerobic exercise that goes on for more than thirty minutes; and growth hormone is produced at an accelerated rate when fasting.

The organism does not readily establish itself in the human body, and seems to flourish best when it finds a nidus in necrotic tissue and is accompanied by aërobic organisms, which, by using up the oxygen in the tissues, provide for it a suitable environment. The presence of a foreign body in the wound seems to favour its action.

But the anthrax bacteridium is exclusively aerobic, and the proportion of oxygen is far from being equally distributed throughout the tissues: innumerable conditions can diminish or exhaust the supply here and there, and since the microbe-producing pus is also aerobic, it can be understood how, by using a quantity slightly greater than that of the bacteridium it might easily deprive the latter of the oxygen necessary for it.

An exercising body really does make antidepressant neurochemicals called endorphins, but only after about 45 minutes to an hour of aerobic workout. Endorphins are powerful, with painkilling and euphoric effects equal to or greater than heroin, but without any undesirable side effects.

It is therefore easily eliminated, digested, if one may use the phrase. I have seen these facts many times in anthrax and chicken-cholera, diseases both of which are due to the presence of an aerobic parasite.

The resting rate is how fast the heart beats after a person has been sitting still, comfortably relaxing for three to five minutes. When a person is active the heart beats faster than the resting rate. One measure of aerobic fitness is how quickly the heart is able to return to its resting rate.

An alkaline medium favours bacterial growth; and moisture is a necessary condition; spores, however, can survive the want of water for much longer periods than fully developed bacteria. The necessity for oxygen varies in different species. Those that require oxygen are known as aërobic bacilli or aërobes; those that cannot live in the presence of oxygen are spoken of as anaërobes.

My husband, who hates the boredom of exercise, enjoys a ski machine in front of the TV while the stock market program is on. He finds the TV interesting enough that he pays no attention to his workout. Daily aerobic exercise will strengthen the heart, gradually slowing the heart's resting pulse rate, indicating that the heart has become much stronger, pumping more blood with each pulse.

A daily aerobic program must be started on a carefully managed gradient, using the pulse rate as an regulator, at first raising their maximum heart rate to a point just below 150 percent of its resting pulse and keeping it there for thirty minutes. One can walk, jog, ride a bicycle or use an exercise machine. Actually, everyone should do this, even those with no heart problems.

The day after the injection they cannot be recovered even in cultures. I seem to have observed as a general principle, that, provided the blood corpuscles are in good physiological condition it is difficult for aerobic parasites to develop in the blood.