J Strength Cond Res. 2009 Sep;23(6):1633-6.
Relationship between maximal squat strength and five, ten, and forty yard sprint times.
McBride JM, Blow D, Kirby TJ, Haines TL, Dayne AM, Triplett NT.
Department of Health, Leisure, and Exercise Science, Neuromuscular Laboratory, Appalachian State University, Boone, North Carolina 28608, USA.
The purpose of this investigation was to examine the relationship between maximal squat strength and sprinting times. Seventeen Division I-AA male football athletes (height = 1.78 +/- 0.04 m, body mass [BM] = 85.9 +/- 8.8 kg, body mass index [BMI] = 27.0 +/- 2.6 kg/m2, 1 repetition maximum [1RM] = 166.5 +/- 34.1 kg, 1RM/BM = 1.94 +/- 0.33) participated in this investigation. Height, weight, and squat strength (1RM) were assessed on day 1. Within 1 week, 5, 10, and 40 yard sprint times were assessed. Squats were performed to a 70 degree knee angle and values expressed relative to each subject's BM. Sprints were performed on a standard outdoor track surface with timing gates placed at the previously mentioned distances. Statistically significant (p < or = 0.05) correlations were found between squat 1RM/BM and 40 yard sprint times (r = -0.605, p = 0.010, power = 0.747) and 10 yard sprint times (r = -0.544, p = 0.024, power = 0.626). The correlation approached significance between 5 yard sprint times and 1RM/BM (r = -0.4502, p = 0.0698, power = 0.4421). Subjects were then divided into those above 1RM/BM of 2.10 and below 1RM/BM of 1.90. Subjects with a 1RM/BM above 2.10 had statistically significantly lower sprint times at 10 and 40 yards in comparison with those subjects with a 1RM/BM ratio below 1.90. This investigation provides additional evidence of the possible importance of maximal squat strength relative to BM concerning sprinting capabilities in competitive athletes.
Thought this might be of use for Coop.
to name a few) but i can see that relationship. Take a sprinter, add 20kg to his squat- that increase in lower body strength is going to make every hamstring and glute contraction that little bit harder. The way i look at it each single leg action is going to be a decreased percentage of his 1rm. Given the inverse correlation of weight and velocity each contraction will be faster.