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The purpose of this study was to investigate the effects of chiropractic low back adjustments on thigh muscle strength. Force production was measured during different types of muscle contractions with a device called an isokinetic dynamometer. The study included 21 college-aged subjects who did not have any pain and had never received chiropractic treatment with spinal manipulation. During two separate sessions, subjects' thigh muscle forces were recorded while performing maximal muscle contractions on the isokinetic dynamometer. Baseline measurements of muscle force were acquired before either treatment form of spinal manipulation or a sham spinal manipulation, followed by identical muscle force measurements within five and twenty minutes post-treatment.
Spinal manipulation is a therapeutic procedure employed by various healthcare practitioners for alleviating acute and chronic musculoskeletal complaints. This form of treatment is also delivered to enhance the performance and augment the rehabilitation of athletes. However, despite research findings alleging the strength-modulating effects of spinal manipulation alongside numerous professional athletes' positive anecdotal claims concerning its results, the physiological processes to explain its effects remain largely unexplained. Therefore, the purpose of this work was to investigate the effects of spinal manipulation in a college-aged sample population.
This study examined the effect of spinal manipulation delivered to the lumbosacral region on concentric force production of the knee extensors and flexors. A randomized, controlled, single-blind repeated measures design was utilized with 21 subjects. Isometric and isokinetic peak torques (Nm) were recorded during two separate session while subjects performed maximal voluntary contractions post-treatment of either spinal manipulation or a sham manipulation.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Spinal Manipulation | Active Comparator | In a repeated measures, crossover design, all subjects received spinal manipulation during the second or third session. The selection of spinal manipulation or sham was randomized. |
|
| Sham Manipulation | Sham Comparator | In a repeated measures, crossover design, all subjects received the sham manipulation during the second or third session. The selection of spinal manipulation or sham was randomized. |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Spinal Manipulation | Other | Side-posture, high-velocity low-amplitude spinal manipulation targeting the lumbar spine and sacroiliac joints |
|
| Measure | Description | Time Frame |
|---|---|---|
| Changes in isometric and isokinetic peak torques compared to baseline | Peak torque measurements were recorded in newton meters (Nm) while subjects performed maximal voluntary contractions of concentric knee extension and flexion during a randomized protocol of isometric and isokinetic contractions, all of which measured with an isokinetic dynamometer | Baseline peak torque measurements were acquired before either treatment form of lumbosacral manipulation or sham manipulation, followed by identical peak torque measurements recorded within 5 minutes and at 20 minutes post-treatment |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| Grant D Sanders, D.C. | University of Kentucky | Principal Investigator |
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| PubMed Identifier | Type | Citation | Retractions |
|---|---|---|---|
| 22289432 | Background | Hurwitz EL. Epidemiology: spinal manipulation utilization. J Electromyogr Kinesiol. 2012 Oct;22(5):648-54. doi: 10.1016/j.jelekin.2012.01.006. Epub 2012 Jan 29. | |
| 14589467 | Background | Pickar JG. Neurophysiological effects of spinal manipulation. Spine J. 2002 Sep-Oct;2(5):357-71. doi: 10.1016/s1529-9430(02)00400-x. |
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| ID | Term |
|---|---|
| D020393 | Manipulation, Spinal |
| ID | Term |
|---|---|
| D026201 | Musculoskeletal Manipulations |
| D026741 | Physical Therapy Modalities |
| D013812 | Therapeutics |
| D012046 | Rehabilitation |
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| Sham Manipulation | Other | A simulated lumbar spine manipulation in which no vertebral contact was made |
|
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