Kinetics and mechanism of oxygen debt contraction in mad

-Oxygen consumption, along with lactic and pyruvic ac id in blood, have been measured throughout the performance of heavy muscular exercise of different intensities, all leading to exhaustion in I-I o min. Oxygen consumption increases ex-ponentially with time; the maximum level attained seems to be independent of the intensity of exercise except in exercises of very high intensity and short duration, when it seems to be slightly increased. The rate of increase of oxygen consumption increases with the intensity of exercise. Pyruvic acid in blood increases exponentially also, and a steady state is reached at a level w hich tends to be higher, the heavier the exercise. Lactic acid increases as a linear function of time, the line eventually flattening down only toward the end of the exercise when the maximal values of lactic acid are reached. The lactic acid increase, grams per minute, is a linear function of th