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Objective Badminton four-corner running practice with change of direction commonly includes fix route and random route. However, the study of the energy contributions characteristics of these two training methods was very limited. The aim of this study was to investigate the influence of different route randomness on energy contributions of college students' badminton running practice with change of direction at two frequencies.   Methods 15 college badminton player whom from Shanghai University of Sport (Male, N=15, 22.9±1.4 yrs, 175.7±6.0 cm, 68.0±6.4kg, badminton training experience 2.2±0.5 yrs) volunteered to perform one test for maximal oxygen uptake VO2max on treadmill and four field tests with two route randomness (fix route and random route, F and R ) and two frequencies (24 times per 1min and 24 times per 1min, H and L ) of change of direction. A portable spirometric system (K4b2, Cosmed, Italy) was utilized to measure the ventilator information during the test, and capillary blood was taken from earlobe and analyzed prior and post the tests. The energy contributions was calculated with the method based on the fast component of oxygen debt (WAla) , accumulated blood lactate (WLa) and VO2 (WAer)during the tests. Results Higher frequency significantly increased the energy contributions from the three pathways both with F and R (WAla:26.2±6.3 kJ vs. 39.5±12.6 kJ, WLa: 5.7±2.4kJ vs. 23.1±9.3 kJ, WAer: 27.1±6.5kJ vs. 33.3±5.7kJ, P<0.01), and significantly increased the WLa (F: 23.9±8.1% vs. 9.6±3.4%, P<0.01; R: 30.5±6.6% vs. 11.7±5.2%, P<0.01), whereas significantly reduced the WAer% (F: 35.2±6.5% vs. 46.0±8.5%, P<0.01; R: 35.7±5.4 % vs. 50.4±10.2%, P<0.01). The R significantly reduced the WLa% both in L (44.4±8.5% vs. 38.0±8.6% , P<0.05) and H (40.9±10.5% vs. 33.8±8.6%, P<0.05), significantly increased the WLa (23.1±9.3kJ vs. 28.9±7.3kJ, P<0.05) and WLa% (23.9±8.1% vs. 30.5±1.7%) in H. Conclusions The route randomness of badminton running practice with change of direction at two frequencies has different effects on the energy contributions. The R will reduce the stimulation to the WAla and increase the stimulation to the WLa ; the H will increase the intensity of the running with change of direction as a whole, and will reducing the stimulation to the WAer and increasing the stimulation to the WLa. It is recommended that the coaches can change the stimulation of the WLa by changing the frequency of the change of direction and the randomness of the route when design the badminton four-corner running practice with change of direction.

exercise biochemistry review

PO-222 The Influence of Different Route Randomness on Energy Contributions of College Students' Badminton Running Practice with Change of Direction at Two Frequencies