TY - JOUR
T1 - Effects of Lumbosacral Manipulation on Isokinetic Strength of the Knee Extensors and Flexors in Healthy Subjects
T2 - A Randomized, Controlled, Single-Blind Crossover Trial
AU - Sanders, Grant D.
AU - Nitz, Arthur J.
AU - Abel, Mark G.
AU - Symons, T. Brock
AU - Shapiro, Robert
AU - Black, W. Scott
AU - Yates, James W.
N1 - Publisher Copyright:
© 2015 National University of Health Sciences.
PY - 2015/12/1
Y1 - 2015/12/1
N2 - Objective: The purpose of this study was to investigate the effect of manual manipulations targeting the lumbar spine and/or sacroiliac joint on concentric knee extension and flexion forces. Torque production was measured during isometric and isokinetic contractions. Methods: This was a randomized, controlled, single-blind crossover design with 21 asymptomatic, college-aged subjects who had never received spinal manipulation. During 2 separate sessions, subjects' peak torques were recorded while performing maximal voluntary contractions on an isokinetic dynamometer. Isometric knee extension and flexion were recorded at 60° of knee flexion, in addition to isokinetic measurements obtained at 60°/s and 180°/s. Baseline measurements were acquired before either treatment form of lumbosacral manipulation or sham manipulation, followed by identical peak torque measurements within 5 and 20 minutes posttreatment. Data were analyzed with a repeated measures analysis of variance. Results: A statistically significant difference did not occur between the effects of lumbosacral manipulation or the sham manipulation in the percentage changes of knee extension and flexion peak torques at 5 and 20 minutes posttreatment. Similar, nonsignificant results were observed in the overall percentage changes of isometric contractions (spinal manipulation 4.0 ± 9.5 vs sham 1.2 ± 6.3, P = .067), isokinetic contractions at 60°/s (spinal manipulation -. 4.0 ± 14.2 vs sham -. 0.3 ± 8.2, P = .34), and isokinetic contractions at 180°/s (spinal manipulation -. 1.4 ± 13.9 vs sham -. 5.5 ± 20.0, P = .18). Conclusion: The results of the current study suggest that spinal manipulation does not yield an immediate strength-enhancing effect about the knee in healthy, college-aged subjects when measured with isokinetic dynamometry.
AB - Objective: The purpose of this study was to investigate the effect of manual manipulations targeting the lumbar spine and/or sacroiliac joint on concentric knee extension and flexion forces. Torque production was measured during isometric and isokinetic contractions. Methods: This was a randomized, controlled, single-blind crossover design with 21 asymptomatic, college-aged subjects who had never received spinal manipulation. During 2 separate sessions, subjects' peak torques were recorded while performing maximal voluntary contractions on an isokinetic dynamometer. Isometric knee extension and flexion were recorded at 60° of knee flexion, in addition to isokinetic measurements obtained at 60°/s and 180°/s. Baseline measurements were acquired before either treatment form of lumbosacral manipulation or sham manipulation, followed by identical peak torque measurements within 5 and 20 minutes posttreatment. Data were analyzed with a repeated measures analysis of variance. Results: A statistically significant difference did not occur between the effects of lumbosacral manipulation or the sham manipulation in the percentage changes of knee extension and flexion peak torques at 5 and 20 minutes posttreatment. Similar, nonsignificant results were observed in the overall percentage changes of isometric contractions (spinal manipulation 4.0 ± 9.5 vs sham 1.2 ± 6.3, P = .067), isokinetic contractions at 60°/s (spinal manipulation -. 4.0 ± 14.2 vs sham -. 0.3 ± 8.2, P = .34), and isokinetic contractions at 180°/s (spinal manipulation -. 1.4 ± 13.9 vs sham -. 5.5 ± 20.0, P = .18). Conclusion: The results of the current study suggest that spinal manipulation does not yield an immediate strength-enhancing effect about the knee in healthy, college-aged subjects when measured with isokinetic dynamometry.
KW - Knee
KW - Muscle strength
KW - Spinal manipulation
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U2 - 10.1016/j.jcm.2015.08.002
DO - 10.1016/j.jcm.2015.08.002
M3 - Article
AN - SCOPUS:84948823383
SN - 1556-3707
VL - 14
SP - 240
EP - 248
JO - Journal of Chiropractic Medicine
JF - Journal of Chiropractic Medicine
IS - 4
ER -