Effect of Dynamic Warm Up After An Acute Bout of Static Stretching on Knee Flexion Isokinetic Torque Production
Location
CSU Ballroom
Start Date
9-4-2012 1:00 PM
End Date
9-4-2012 2:30 PM
Student's Major
Human Performance
Student's College
Allied Health and Nursing
Mentor's Name
Robert Pettitt
Mentor's Department
Human Performance
Mentor's College
Allied Health and Nursing
Description
Static stretching prior to physical activity purportedly increases muscle compliance decreases elasticity resulting in reduced power performance. Prior investigators have used a change optimum angle of torque production (ϴopt) as a surrogate measure for change in muscle compliance. The purpose of this study was to peak torque and ϴopt of the hamstrings (i.e., knee flexion) in response to static and dynamic stretching. Subsequent to a familiarization trial, 14 collegiate football players performed a 5 minute, cycle ergometer warm up and a pretesting isokinetic bout of each knee at 60 deg/s for a total of 5 repetitions. In counterbalanced order, subjects performed either a static or dynamic stretching protocol (4 X 30 seconds). After a 3 minute rest, the subjects completed a posttesting isokinetic bout. Data (every 10 msec) were exported to tab-delimited text files and evaluated manually to determine peak torque and ϴopt. No differences in peak torque from pretesting (147 ± 28 Nm) to posttesting (151 ± 24 Nm) were observed between dynamic and static stretching (F=3.07, p=0.90). Similarly, no differences in ϴopt (~34 to 36°) were observed between dynamic and static stretching (F=0.23, p=0.88). Similar typical errors between repetitions, at pretesting and posttesting, were observed (~5 to 9°, 17 to 27%). Our results demonstrate that static stretching does not alter peak torque production. Moreover, the similarity of the ϴopt data refutes the hypothesis that static stretching adversely affects muscle compliance and elasticity, a result that is contrary to the dogma that static stretching reduces power.
Effect of Dynamic Warm Up After An Acute Bout of Static Stretching on Knee Flexion Isokinetic Torque Production
CSU Ballroom
Static stretching prior to physical activity purportedly increases muscle compliance decreases elasticity resulting in reduced power performance. Prior investigators have used a change optimum angle of torque production (ϴopt) as a surrogate measure for change in muscle compliance. The purpose of this study was to peak torque and ϴopt of the hamstrings (i.e., knee flexion) in response to static and dynamic stretching. Subsequent to a familiarization trial, 14 collegiate football players performed a 5 minute, cycle ergometer warm up and a pretesting isokinetic bout of each knee at 60 deg/s for a total of 5 repetitions. In counterbalanced order, subjects performed either a static or dynamic stretching protocol (4 X 30 seconds). After a 3 minute rest, the subjects completed a posttesting isokinetic bout. Data (every 10 msec) were exported to tab-delimited text files and evaluated manually to determine peak torque and ϴopt. No differences in peak torque from pretesting (147 ± 28 Nm) to posttesting (151 ± 24 Nm) were observed between dynamic and static stretching (F=3.07, p=0.90). Similarly, no differences in ϴopt (~34 to 36°) were observed between dynamic and static stretching (F=0.23, p=0.88). Similar typical errors between repetitions, at pretesting and posttesting, were observed (~5 to 9°, 17 to 27%). Our results demonstrate that static stretching does not alter peak torque production. Moreover, the similarity of the ϴopt data refutes the hypothesis that static stretching adversely affects muscle compliance and elasticity, a result that is contrary to the dogma that static stretching reduces power.
Recommended Citation
Martens, Zachary. "Effect of Dynamic Warm Up After An Acute Bout of Static Stretching on Knee Flexion Isokinetic Torque Production." Undergraduate Research Symposium, Mankato, MN, April 9, 2012.
https://cornerstone.lib.mnsu.edu/urs/2012/poster-session-B/16
