Scientific studies- It works!
STUDY 1- 175 patients who were unable to work due to back pain were treated. After eight inversion treatments, 155 patients were able to return to their jobs full time. Study concluded that the main basis for improvement was the stretching of paraspinal vertebral muscles and ligaments and possibly the widening of intravertebral discs. Study found significant improvements in a variety of diagnosis including spondylolisthesis, herniated discs, lumbar osteoarthritis with sciatica, and coccygodynia.
*Sheffield, F.: Adaptation of Tilt Table for Lumbar Traction. Arch Phys Med Rehabil 45: 469-472, 1964.
STUDY 2- Study found emg activity (an indicator of muscle pain) declined 35% within the first 10 seconds of inversion. Study found that inversion increases the spinal length. Study concluded there is a correlation between a reduction in emg activity and an increase in spinal length.
*Nosse, L.: Inverted Spinal Traction. Arch Phys Med Rehabil 59: 367-370, Aug 78.
STUDY 3- Study concluded that inversion can be an effective means of spinal traction. Subjects inverting in the hip flexed position experienced greater separation between the lumbar vertebrae.
* Ballantyne, Byron, et al: The Effects of Inversion Traction on Spinal Column Configuration, Heart Rate, Blood Pressure, and Perceived Discomfort. Jour of Orthopedic Sports Phys Ther. 254-260, Mar 86
STUDY 4- Study found gravity-facilitated traction (inversion), produces significant intravertebral separation in lumbar spine. Study concluded gravity facilitated traction may be an effective modality in the relief of low back pain.
•Kane, M, et al: Effects of Gravity-facilitated Traction on Intravertebral Dimensions of the Lumbar Spine. Jour of Orthopedic and Sports Phys Ther. 281-288, Mar 85.
STUDY 5- 116 people were enrolled in the randomized controlled trial which lasted for 12 months. A randomized controlled trial with two training groups and one control group was conducted to asses the effect of gravity inversion on pain level and absenteeism due to LBP.
Average age = 44 years. 77% men
Group 1: used inversion for 10 minutes 1/day
Group 2: used inversion for 10 minutes 2/day
Group 3: control group- Results after 12 months of training program:
1. The employees in Group 1 and 2 decreased sick days due to back pain by 33%.
2. Average sick days to due back pain fell by 8 days per individual in the treated group.
3. "Inversion is an efficient and cheap way to improve employee health and possibly reduce sick day costs to the employer."
•Dimberg, L, et al: Effects of gravity-facitliated traction of the lumbar spine in persons with chronic low back pain at the workplace.