The Effect of Spinal Manipulation on Hip Extension Strength and Jump Height

The purpose of this study is to study the effects of lumbar manipulation on hip extension strength and jump height in healthy subjects.Procedures to be followed: First, the subject will be asked to complete a medical history form. Then they will be instructed on the procedure for strength and jump testing. Next, range of motion of the low back will be measured. Then hip strength will be measured using a digital handheld measurement tool. The subject will then be asked to jump as high as they can on a floor mat. The subject will then receive a sealed envelope indicating the intervention they will to receive, either the manipulation or a fake manipulation. Instructions will be provided, and the subject will be positioned on a treatment table to receive the intervention. At this point, they will either receive the manipulation or fake manipulation on the right and left side. An immediate re-test of hip strength will be taken, and the subject will again jump as high as they can on a floor mat. Follow-up measures of these tests will be completed again 20 minutes after the intervention is given.

Inclusion Criteria:Between the ages of 18 and 30able to read and write in English and clearly understand the informed consent.Exclusion Criteria:currently have low back painpregnant or may be pregnantpreviously diagnosed with spondylolisthesis, a herniated disc, or have signs and symptoms of nerve root compressionhistory of spine surgeryhistory of cancer, compression fracture, osteoporosis, osteopenia, or a history of systemic, connective tissue, or neurological disease,pain with the pre-manipulative holdpositive findings on medical history form, or physical exam,presence of anxiety during the procedure