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ABSTRACT Fifty-three football players were evaluated to determine the contributions of speed, agility and body composition to anaerobic power output. Speed was evaluated from the 10- and 40-yard dashes. Agility was measured from a specifically designed pattern requiring change of direction. Body composition was estimated from skinfolds using general and sports-specific equations. Power was determined from the Margaria-Kalamen stair run test. Body weight made the biggest contribution to power estimation (r = 0.82). Ten-yard dash speed (r = 0.16) and agility (r = 0.21) made only minor contributions to power output; however, when the effect of body weight was removed statistically, faster (r = −0.54) and more agile (r = −0.31) players produced greater power outputs. The relationship between strength, as measured from the bench press, and power (r = 0.68) was reduced substantially when controlled for the effect of body weight (r = 0.33). Multiple regression analysis indicated that body size and speed were the major contributing factors to power production. Factor analysis isolated size/strength/power, speed/fat and agility dimensions, further illustrating the independence of these fundamental characteristics among football players. The Margaria-Kalamen power test appeared to be related to size and strength in college football players, moderately dependent on speed and relatively unrelated to agility.
Mayhew et al. (Sun,) studied this question.