(1,2,3,4,5,6,7,8,9,lO). The effects of training on various fitness parameters including strength, flexibility, body composition and cardiovascular endurance have been investigated. Measurement of these fitness parameters by the physical educator is necessary to discover the functionally unfit and to classify the functionally fit in positions of various levels of efficiency (11, p. 301).The popularization of long distance running, swimming, and other endurance-type sports in the last decade has brought to the forefront the need for developing and measuring cardiovascular endurance.Cardiovascular endurance can be defined as 11 the capacity of the individual to maintain strenuous activity of a number of muscle groups of the whole body for a prolonged period. (A period sufficient to demand a resistance to fatigue)
11(12, p. 374).Measurement of cardiovascular endurance, however, has been a difficult task in that it is difficult to separate it from other fitness parameters; power, strength, speed, and flexibility (13, p. 106).Oxygen uptake or vo 2 is generally considered to be the best single criterion of cardiovascular endurance (4,12,14,15), but the direct laboratory measurements needed to acquire this data are too compli-2 cated and expensive for use by most physical educators. Many studies, therefore, have investigated the relationship between other more easily administered tests and the direct measurement of vo 2 in the laboratory (1 ,3,8,9,16,17,18,19,20,21 • Oxygen uptake capacity or vo 2 is generally considered to be the best single physiological criterion of cardiovascular endurance. In a study by Stewart, Williams, and Gutin (14), 33 college women were tested• for actual V02max on the treadmill and on a 2 Km. run. The study compared the relationship between cardiorespiratory endurance and various anthropometric measures and discovered that a significant 70% • of the variance in test performance was accountable to vo 2 max.In another study with more active college women subjects, Higgs• (4) found a significant correlation (r = .64) between vo 2 max and physical work done on a treadmill performance test. In factoring out motivation, however, Ryan (29) did report a study in which the use of four different extrinsic motivational conditions (electric shock, knowledge of results, exhorta-