. the athlete enters into a stage, when although running, has a pulse iate of.

mobilization d gFycogen stoie. hpoJysis and increase d plasma free fatty acids. In long drawn severe exercise. cortisol secretion increases sharply. Steady State In a sustained exercise which may be light, moderate or moderately heavy (but not maxinvih in nature, alter the initial phase, the person enters a state, called the 'stwdy state', when although continuing the exercise, his/her putee rale. 02 consumption, body temperature blood lactic acid concentration (are many other parameters) show no further change for example in a long distance lunmiig. the athlete enters into a stage, when although running, has a pulse iate of. say 140mm body temp. 38 C and so on and these parameters remain steady at these values This can occur when the intensity of work as well as the environmental temperature remain constant. However the fact that someone has entered a steady stale, does not mean that he can continue his work lor unlimrted time. The break. in such type of exercises, conies due to fatigue and exhaustion. Further, with continuation of the exercise, the steady state tends to break down. Fatigue The question of fatigue has been dealt earlier (chap 2, sec IX) Two terns were used in that connection, viz, (1) fatigue d the isolated nerve muscle preparation (or a small group of muscles) and (ii) general fatigue. It was also stated there that in physical exercise (by an intact man) it is the general latigue that sets in and the seat d this type d fatigue is the synapses d the central nervous system. Further, the role of dexecfrine, an antrfatigue agent, was also stressed there. At this stage, the teledogy of fatigue can be discussed. The general fatigue seen during a strenuous . prevents continuation of any further work and in this way prevents possible injury. Use of dexedrine (in addition