Platform Exercise Training
|Knee Osteoarthritis||Other: Whole Body Vibration Training Other: Exercise without vibration|
|Study Design:||Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single Blind (Outcomes Assessor)
Primary Purpose: Treatment
|Official Title:||Platform Exercise Training for Women at Risk for Knee Osteoarthritis|
- Isokinetic quadriceps strength [ Time Frame: Change from baseline to 12 weeks ]
- Vibration Perception Threshold [ Time Frame: Change from baseline to 12 weeks ]
- Leg press muscle power [ Time Frame: Change from baseline to 12 weeks ]
- Timed Stair Climb [ Time Frame: Change from baseline to 12 weeks ]
|Study Start Date:||November 2010|
|Study Completion Date:||March 2011|
|Primary Completion Date:||March 2011 (Final data collection date for primary outcome measure)|
Experimental: Whole Body Vibration Training
The subjects will participate in a 12-week whole body vibration exercise program with 2 sessions (1/2 hour) per week.
Other: Whole Body Vibration Training
The subjects will participate in a 12-week exercise program with two sessions (1/2 hour) per week.
Experimental: Exercise without vibration
The subjects will participate in a 12-week exercise program with 2 sessions (1/2 hour) per week.
Other: Exercise without vibration
Participants will complete the same exercises without vibration twice a week for 12 weeks (1/2 hour sessions).
Osteoarthritis (OA) is the most common disabling disease in older adults,(1) affecting over 25 million Americans, resulting in significantly impaired function and mobility(2) and a societal economic burden.(3) The knee is the weight-bearing joint most commonly affected,(10) and the prevalence of symptomatic knee OA is between 9% and 21% among those 65 years and older.(2, 11, 21) Loss of knee range of motion can lead to significant difficulty in bathing, lower body dressing, stair mobility, and walking.
Impaired mobility due to knee OA will have an increasingly significant societal impact, with 67 million adults projected to have arthritis by 2030, and 25 million with arthritis-attributable activity limitations.(22) Women are at greater risk for knee OA compared with men. Knee OA leads to chronic disability,(23-25) functional limitations,(26) and dependence.(27) Patients with knee OA frequently are limited in their activities by joint stiffness or buckling, decreased range of motion, muscle weakness, poor balance, impaired proprioception, reduced vibration sense, and/or pain. Currently, there are limited options available for patients for improving the outcome of knee OA once they have it. At this time, patients may use analgesics for pain with total knee replacement as the last option. However, we recently found that greater quadriceps strength protected against the development of incident symptomatic knee OA and progression of knee OA in women.(19-20) Thus, strengthening the quadriceps muscle may prevent worsening of the knee joint. Though before studying whether strengthening is effective in reducing risk for knee OA, it is necessary to first determine an effective and tolerated means of exercise.
Vibration platform exercise may provide the benefits of strength training without adding potentially harmful loads to the knee joint. In one study of nursing home residents with limited functional capacity, balance and mobility improved over a 6-week whole body vibration exercise program. (12) In another study that compared whole body vibration (WBV) to resistance training in older women, greater improvement in knee extensor strength and speed of movement was found with WBV exercise.(13) Additionally, after a 2-month exercise program with older adults between the ages of 59 to 86, walking speed, step length, and the maximum standing time on one leg significantly improved with WBV exercise.(14) WBV exercise was safe and well tolerated in the elderly.(14, 15, 16) There have also been indications that WBV may improve flexibility. While a study testing range of motion (ROM) found that both the WBV and the control groups had significant increases in hamstring flexibility, only the WBV group showed a significantly larger increase (30%) in ROM than did the control group (14%).(17) There have also been indications WBV may improve proprioception (joint position sense) in women with knee osteoarthritis. One study which compared control versus exercise on a vibration platform and a balance board vibration platform found improvements in muscle strength and proprioception, respectively.(18) Thus, these studies suggest a beneficial effect of WBV exercise in addition to muscle strengthening, balance, and walking exercises in improving the walking ability in the elderly.
Exercises conducted on a vibrating platform will induce a muscle reflex, increasing muscle fiber activation at a higher level compared to performing the exercises on a non-vibrating platform. We have selected the frequency and duration of this program based on 1) frequency used in previous studies and recommended by the manufacturer and 2) duration of 12 weeks based on previous data which found the most gain in knee extensor strength and speed of the movement occurred at week 12 of a 24-week program. (13)
Vibration exercise may be a better option than strength training alone, if the exercises can be completed in less time and with similar strength gains as resistance training, but without the additional loads contributing to the stress on patients' joints.
Please refer to this study by its ClinicalTrials.gov identifier: NCT01239823
|United States, Iowa|
|The University of Iowa|
|Iowa City, Iowa, United States, 52242|
|Principal Investigator:||Neil A Segal, MD, MS||The University of Iowa|