Resistance Exercise and Knee Osteoarthritis Pain, Functional Impairment and Cartilage Turnover

Not Applicable

Completed

Conditions: Knee Osteoarthritis

Interventions: Other: Concentric Focused Resistance Exercise
Other: Eccentric Focused Resistance Exercise
Other: normal activities and clinical care

Registration Number: NCT01245283

Lead Sponsor: University of Florida

Brief Summary: The purpose of this study is to determine if a 4 month resistance exercise program can reduce knee osteoarthritis pain functional impairment and cartilage turnover.

Detailed Description: Not available

Recruitment & Eligibility

Status: COMPLETED

Sex: All

Target Recruitment: 90

Inclusion Criteria

Osteoarthritis (OA) of the knee for >6 months
moderate to severe pain immediately following a 50-foot walk
knee pain primarily due to tibiofemoral OA and not from patellofemoral OA
bilateral standing anterior-posterior radiograph demonstrating grade 2 or 3 OA of the target knee
willing and able to participate in regular exercise for four months
free from musculoskeletal limitations that would preclude resistance exercise participation
free of abnormal cardiovascular responses during the screening graded maximal walk test

Exclusion Criteria

unable to walk
regular resistance exercise training (>3X week) within the past 6 months
specific low back pain or acute back injury
spinal stenosis that precludes walking one block due to neurogenic claudication
any major injury to either knee within the prior 12 months
any surgery to either knee within the last 12 months
lumbar radiculopathy
vascular claudication
significant anterior knee pain due to diagnosed isolated patella-femoral syndrome or chondromalacia in either knee
have had corticosteroid or viscosupplement injections within three months of study participation
have added new over the counter or prescription pain medication within two months of study participation

Study & Design

Study Type: INTERVENTIONAL

Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Concentric Focused RX (CRX)	Concentric Focused Resistance Exercise	Training protocol for 1 set of each exercise will be completed - leg press, leg curl, leg extension, chest press, seated row, overhead press, triceps dip, biceps curl, and calf press.
Eccentric Focused RX (ERX)	Eccentric Focused Resistance Exercise	The Human Dynamics Laboratory features prototype equipment that increases resistance loads during the eccentric phase of the contraction while "assistance" is provided by the machine during the concentric phase. One set of each exercise - leg press, leg curl, leg extension, chest press, seated row, overhead press, triceps dip, biceps curl, and calf press.
Wait-list Non-exercise Control (CON)	normal activities and clinical care	Subjects will continue to participate in their normal activities and clinical care during the four month study period if assigned to this group.

Primary Outcome Measures

Name	Time	Method
Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC Score); Change From Baseline at 4 Months	Baseline, 4 Months	The WOMAC is a standard, multidimensional, self-administered functional-health status instrument for patients with lower limb OA. Subjects will complete the self-assessment at the time intervals indicated to document any change in their perception of their functional health status. Scale for Total score: the higher score means the worst the function and pain Total WOMAC scores will have a range of 0 to 96 (best and worst scores possible). 0-20 Womac pain (0= best, 20=worst) 0-8 Womac stiffness (0= best, 8=worst) 0-68 Womac functional (0= best, 68=worst) 0-96 Womac Total (0= best, 96=worst)

Secondary Outcome Measures

Name	Time	Method
Chest Press; Change From Baseline at 4 Months	Baseline, 4 Months	Each participant will perform a one repetition maximum. Participants will perform a chest press which is an upper body strength training exercise that consists of pressing a weight upwards from a supine position. This resistence is measured in pounds.
Six Minute Walk Test; Change From Baseline at 4 Months	Baseline, 4 Months	Each participant will walk at a self-selected pace in the lab around a pre-measured loop for a period of six minutes. Subjects will complete the walk test at the time intervals indicated to document any change. 6 minute walk test is a baseline and 4 month post intervention measurement. It is used to measure distance covered while walking during 6 minutes.
Chair Rise Time and Stair Climb Time; Change From Baseline at 4 Months	Baseline, 4 Months	Functional abilities related to moving body weight will be captured using two standard tests, the chair rise time and stair climb time. Subjects will complete the tests at the time intervals indicated to document any change in their functional abilities.
Leg Press Test; Change From Baseline at 4 Months	Baseline, 4 Months	Each participant will do a one repetition maximum. Participants will perform a leg press. The leg press is a weight training exercise in which the individual pushes a weight or resistance away from them using their legs.
Leg Extensions Test; Change From Baseline at 4 Months	Baseline, 4 Months	Each participant perform a one repetition maximum . Participants will perform a leg extension which is a resistance weight training exercise that targets the quadriceps muscle in the legs. The exercise is done using a machine called the Leg Extension Machine. This resistence is measured in pounds.
Leg Curl Test; Change From Baseline at 4 Months	Baseline, 4 Months	Each participant will perform a one repetition maximum. Participant will perform a leg curl which is an isolation exercise that targets the hamstring muscles. The exercise involves flexing the lower leg against resistance towards the buttocks. This resistence is measured in pounds.
Shoulder Press Test; Change From Baseline at 4 Months	Baseline, 4 Months	Each participant will perform a one repetition maximum. Participants will perform the shoulder press which is a weight training exercise, typically performed while standing, in which a weight is pressed straight upwards from the shoulders until the arms are locked out overhead. This resistence is measured in pounds.
Seated Row Test; Change From Baseline at 4 Months	Baseline, 4 Months	Each participant will perform a one repetition maximum. Participants will do a seated row test which is pulling on a cable to lift weight from a seated row position. This resistence is measured in pounds.