For a climber the lungs and heart must be the chief care. The action of walking uphill, the lifting of foot and arm continuously and with effort, make a sustained extra demand upon these organs especially. In climbing they have to supply the fuel consumed in muscular effort, and to throw off the poisonous residue, in greater quantity than in normal action, and at an increased pace. The effects of the extra effort, shortness of breath, fatigue, exhaustion, even, in cases, suffocation, are symptoms of the failure of the heart and lungs, in varying degrees, to maintain the equilibrium between the supply and discharge of fuel. The muscle cells and the lungs are being starved of their substance, and the acids are accumulating too rapidly to be naturally got rid of. The heart is consequently enfeebled, the lungs get choked, and the exhaustion increases progressively. The severe muscular strain of a difficult rock feat is in this way doubly exhausting. The local tension is consuming the muscle cells at an abnormal rate, and therefore putting an excessive demand upon the heart and lungs to keep them supplied; and at the same time the contraction of all the great muscles of the trunk, involved in the local effort, is compressing the great organs from outside, and thus impeding their action in producing the increased supply required. Hence the ‘panting’ of an untrained climber after any severe rock passage, however short the effort.
Now, both heart and lungs can learn by practice to perform their normal functions at more than double their normal rate, and yet to maintain the equilibrium in the supply and discharge of fuel such as is needed to allow them to continue their free action.
Hence a climber is concerned to accustom his heart to accelerate, without enfeebling its action and thus diminishing the amount of fuel which each pulsation is supplying. Also, so to exercise his lungs that a number of breathing sacks, not usually employed, may be ready and accustomed for easy use whenever the extra call may be put upon them. By practice a number of dormant lung sacks, as well as those in normal use, may be actually increased in elasticity and volume, so that the lungs as a whole will be prepared to receive a far greater quantity of ‘breath,’ whenever that may be required for a greater effort.
The training for the heart is a regular and increasing graduation of effort, developed in healthful exercises such as walking, running, swimming, wood chopping, etc., and practised until even a violent or long-sustained effort can be made without panting or discomfort.
The training for ‘breath’ is deep breathing; from the bottom of the lungs, and through the nose as much as through the mouth; practised either in the course of natural open air exercise, or, almost as effectively, by slow inhalation and exhalation, for a few moments each day, in the best air obtainable. To increase the capacity of the lungs is to increase the chest measurement, that healthful vanity which mountaineering, above all exercises, flatters. Contrary to our ideas as boys, this is effected from the inside, by breathing, and not from the outside, by arm exercises, etc. ‘Chest’ exercises, indeed, help to make supple the ligaments of the outside framework, and so permit of a greater elasticity in the breathing cells within. Otherwise they are only of use in so far as they demand, or are accompanied by, deep breathing.
Will and Nerves.
A climber has also to remember the very active share that his will power must take in difficult or prolonged mountaineering. He depends upon his will to supply to a large extent the impulse, physical and moral, when nerves and muscles begin to show signs of unwilling service. Among some of the greatest of mountaineers, will has to a notable extent supplied the place of physique. They have climbed on their ‘vitality,’ as we say; on the success of their will in maintaining the impulse to movement long after the muscles have protested their inability to continue the rate of consumption of energy.
The impulses of the will are communicated physically. Their transmission exhausts nerve-fibre as materially as muscular action. As the muscles tire, the messages from the will quicken and increase. The nerve transmitters get irritated, and finally revolt. As a result, we have the frequent mountaineering symptoms of ennui, irritation, conscious fatigue and, in extreme cases, of complete nervous incapacity to resolve upon making another step. But the nerves call for a truce before the muscles are actually exhausted. The muscles, male fashion, invariably protect themselves by retaining some reserve of energy, if only a way can be found of exacting it. Some new interest or excitement may do this; the messages are then switched on to other nerve-lines, the congestion of monotony is relieved, and the will resumes control of the communications, to the extent of obtaining whole hours of further effort from the striking muscles.
But training offers us a surer way of postponing or avoiding these strikes. The body is animated in two fashions from the spinal nerves: by the messages that pass through the brain—I speak as a layman—and by those which serve that mysterious but autocratic regent of our habits, the ‘subconsciousness.’ Under the latter are grouped all our automatic actions, and the more actions we can qualify for admission to its extremely select group of well-ordered subjects, the fewer sequences of orders will the dictator-brain have to promulgate on their account, and the less congested will be the nerve-lines of communications. Walking, for instance, is, with most people, a subconscious action. Once the impulse to step out has been given, the legs will continue to walk automatically so long as the look or feel of the familiar smooth surface continues to suggest the familiar reflex. A change of surface may disturb and therefore make the effort conscious; otherwise the walking can be maintained without fatigue for a much longer time than the same group of muscles could have held out had they been performing some unfamiliar action, and therefore been under the direction of conscious impulses.
The human frame, in attaching itself at two, three or four points to any ordinary surface, is capable of only a limited number of positions. Holds upon rock or ice, suitable for use, not unnaturally recur frequently in similar groupings upon the same type of surface. Consequently, there are whole series of positions of the body and limbs which are constantly repeating themselves in climbing. The more of these subconscious associations which a climber can succeed, by practice, in establishing, as between familiar sequences of holds and automatic adjustments of his motions to their requirements, the fewer calls will he have to make upon nerves and will, and the greater, therefore, will be his endurance. It is largely on this account that a climber, as he gets experience, finds that he can climb with always decreasing effort. It is for this reason also that long, continuous rock ridges, with oft-recurring situations, form the best initial training for young mountaineers and the best annual reintroduction for their elders.