title: Predictors of oxygen uptake and performance during tennis.
abstract: Tennis ball machine tests permit the concurrent measurement of physiological function and groundstroke performance in a sport specific manner. The purpose of this study was to understand further the demands of groundstroke performance during a test with progressively increasing ball frequency, by determining the running speed between strokes, upper and lower limb acceleration and pulmonary gas exchange throughout. Sixteen tennis players (n = 8, male; n = 8, female; all right handed) completed three 4 min stages of hitting against a ball feed frequency of 15, 20, 25 ball.min(-1) interspersed by 8 min of rest. Stepwise multiple regression analysis identified a predictive model of VO2 containing the variables of left arm acceleration and right ankle acceleration but not running speed (p < 0.0001; adjusted r2 = 0.93; left wrist acceleration Beta = 1.04; right ankle acceleration Beta = - 0.12; S. E. E. = 2.61 ml.kg(-1).min(-1)). Regression analysis found that the strongest predictors of stroke performance (ball speed [m.s(-1)] x stroke accuracy [%]) were right wrist acceleration and stroke economy (p < 0.0001; adjusted r2 = 0.28; right wrist acceleration Beta = - 0.59; movement economy Beta = - 0.28). The findings of this study highlight the contribution of limb acceleration and not running speed to the oxygen cost of tennis groundstroke performance.
authors.affiliation: Sports Medicine and Sports Science Division, Singapore Sports Council, Singapore. karl_cooke@hotmail.com
authors.forename: K
authors.initials: K
authors.lastname: Cooke
authors.forename: P
authors.initials: P
authors.lastname: Davey
mesh_terms: D000054:Acceleration; D000293:Adolescent; D000328:Adult; D005121:Extremities / Q000502:physiology; D005260:Female; D006801:Humans; D019344:Lactic Acid / Q000097:blood; D008297:Male; D008954:Models, Biological; D010101:Oxygen Consumption / Q000502:physiology*; D011659:Pulmonary Gas Exchange; D012044:Regression Analysis; D013647:Task Performance and Analysis; D013715:Tennis / Q000502:physiology*
chemical_list: D019344:Lactic Acid