Skeletal muscle, in addition to having the basicproperties common to all tissue, possesses the ability to contract and move the body. This contraction, however,requires that a large amount of energy be released. Infact, the metabolic rate of skeletal muscle can increasemore than any other tissue of the body. Thus, while the skeletal muscles consume a small percent of the oxygenuptake at rest, during heavy rebounding, when the totalbody metabolic rate is increased fifteen to twenty timesthat of rest, most of this increase occurs in the workingmuscles where the metabolic rate may be as much as 100 times higher than at rest.
The energy needed for rebounding aerobics is de-rived from oxidation of carbohydrates and fat and fromsplitting of glycogen and energy-rich phosphates in themuscle cells. .During prolonged rebounding of ten min-utes or more, the energy needed comes from fats andcarbohydrates as the major fuels consumed. Protein degradation occurs only under fasting conditions when thereserves of fat and carbohydrates have been significantlydepleted. During short exhaustive work periods on the rebounding device for a person out of shape, the energy needed comes mostly from glycogen and phosphates.
When your muscles contract during rebounding, the cleavage of adenosine triphosphate (ATP) provides the energy for the contraction of your skeletal muscles. In order to maintain the process of contraction it is, there- fore, necessary to provide a continuous supply of ATP. This is done through taking in the best possible nutrition, and by continuing your training program as much as you can. Studies on animals have shown that the stores of ATP and an associated enzyme called phos- phocreatine are increased during a training period.
We have presented a series of physiological facts relating to rebounding aerobics which are highly technical and might be considered impractical in a book for popular distribution such as this one. Yet, there is much more to present. We’ve merely scratched the surface of the physiological effects of physical conditioning by rebounding. We hope to stimulate research by the re- bound exercise industry through our presentation in this chapter of human physiological concepts of *reboundology.
Some of our technical information may be put into perspective when you consider the response of the human organism to exercising on the rebounder. The story of Mrs. Laverne Groff, cited at the beginning of this chapter, is an example. Or, evaluate the case history described to us by Mrs. Sara Glick of Lancaster, Pennsylvania. Mrs. Glick is an Amish lady who practices reflexology and attempts to bring about healing through the skill of her hands on the bottom of people’s feet. Lately, she has added the rebound unit as one of the healing aides she teaches people to use. This came about as a result of a dramatic occurrence that took place in her own family.
Mrs. Click’s grandchild. Mary anne Fischer, age eight, who lives in Clinton County, Pennsylvania, be- came sick one morning. “She was tight in the chest,” said Mrs. Glick. “She had a cough. We first gave her a collected letter reversal frequency data on 500 normal and 350 MBD children.
The first part of the test measures frequency of reversals on execution. The child is asked to write a series I of numbers and letters as they are dictated to him. The number of reversals the child makes is compared to |normal and MBD children.
In the second part of the test, which measures reversal recognition, the child is presented with a page of letters and numbers. The child is instructed to write an”X” over the incorrect letters and numbers. Dr. Gardner said that the results are then compared with what has been established as “normal” for children of various ages and sex.
Realizing that the child is suffering from a learning disability or MBD, procedures for correction may then be instituted.
8 L.B. Rowell. J.A. Murray, G.L. Brengelmann, and K.R. Kraning II. “Humancardiovascular adjustments to rapid changes in skin temperature during exercise.”Circulatory Research. March 1970, pp. 131-137.
9 A. Szent-Cyorgyi. Chemistry of Muscular Contraction. (New York: Academic Press, 1953).