Mobility Optimization Through Velocity Exercise

Not Applicable

Completed

Conditions: Knee Osteoarthritis

Interventions: Other: Control
Other: Gait Training

Registration Number: NCT00844558

Lead Sponsor: University of Iowa

Brief Summary: Knee Osteoarthritis (OA) accounts for a significant proportion of mobility limitations and is one of the most disabling problems facing the growing population of older adults. The purpose of this research is to reduce disablement of older adults with symptomatic knee osteoarthritis.

Detailed Description: The long-term objective of this research is to reduce disablement of older adults with knee osteoarthritis (OA). This will be accomplished through assessing changes in functional limitations (standing and walking) that occur with 2 mobility-specific interventions. The principle of specificity of training indicates that exercises that closely approximate the goal functional activity are most effective in improving physical performance during that activity. However, there is uncertainty whether intervening to increase muscle power or to improve gait mechanics would be most effective for optimizing mobility in older adults with knee OA. Although gait training may be most specific for improving gait, this approach currently requires supervised physical therapy and expensive equipment. In contrast, power training may be less costly and more convenient if conducted at home. To optimize mobility in older adults with symptomatic knee OA, there is a need to study each of these mobility-specific interventions in a randomized controlled trial (RCT). Successful completion of this trial will inform rehabilitation for maintaining or improving mobility as well as explore the mechanism of effect.

Specific Aim 1: Assess the efficacy of two innovative interventions for improving mobility limitations, disability and quality of life in older adults with symptomatic knee OA.

Primary Hypothesis: For older adults with symptomatic knee OA, in comparison with usual care (control group), a 3-month a) patient-specific gait training intervention and b) mobility-specific power training intervention will reduce lower limb mobility limitations assessed using the Function component of the Late Life Function and Disability Index (LLFDI-Function).

Hypothesis 2: Improved mobility will be maintained at 6 and 12-month follow-up (3 and 9 months following transitioning to home-based training) for each of the 2 intervention groups who receive the combination of the home-based intervention and encouragement to continue participation.

Hypothesis 3: In comparison to baseline measures, at 3, 6, and 12-month follow-up, each of the 2 intervention groups will demonstrate improvements in a) disability (LDCW), b) quality of life assessed using the Knee Osteoarthritis Outcome Score questionnaire Quality of Life component(KOOS Knee QOL), and c) knee OA specific outcome scores using the pain subscale component of KOOS.

Recruitment & Eligibility

Status: COMPLETED

Sex: All

Target Recruitment: 58

Inclusion Criteria

Age 60 or older
Symptomatic knee osteoarthritis (knee osteoarthritis diagnosed by x-ray and frequent knee symptoms)

Exclusion Criteria

bilateral knee replacement
acute or terminal illness
unstable cardiovascular condition or other medical conditions that may impair ability to participate such as pulmonary disease requiring use of supplement oxygen, or current medical condition that affects walking, or lower limb musculoskeletal surgery in the past 6 months

Study & Design

Study Type: INTERVENTIONAL

Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Control	Control	Gait Training Control Group Participants
Gait Training	Gait Training	Gait Training Intervention Group Participants

Primary Outcome Measures

Name	Time	Method
Change in Basic Lower Limb Function (Late Life Function Index) Late Life Function and Disability Instrument	0,3,6, and 12 months	This is a questionnaire that evaluates self-reported difficulty in a person's ability to do discrete actions or activities primarily involving standing, stooping and fundamental walking activities without the help of others. Factors that may influence difficulty in task performance include pain, fatigue, fear, weakness, soreness, ailments, health conditions and disabilities. Scored from 14 to 70 with scores approaching 70 signifying high levels in ability to perform activities primarily involving standing, stooping, and fundamental walking (without assistance), and scores approaching 14 signifying low levels in ability to perform activities primarily involving standing, stooping, and fundamental walking (without assistance).

Secondary Outcome Measures

Name	Time	Method
Change in KOOS Symptoms	0,3,6 and 12 months	This instrument has been found to be a reliable and responsive measure in older adults with knee OA as well as sensitive to changes in pain and knee-related symptoms over 6- and 12-mo periods. Scored from 0 to 100 with 100 indicating no symptoms.
Change in Chair Stand Time	0,3,6,and 12 months	Measured as the total time (in seconds) required to stand five times from a seated position in a standardized chair without using arms.
Change in Knee Osteoarthritis Injury and Outcome Scale (KOOS) Pain	0,3,6 and 12 months	This is a 42-item self-administered questionnaire that covers five patient-relevant dimensions, including pain and knee-related symptoms. This instrument has been found to be a reliable and responsive measure in older adults with knee OA as well as sensitive to changes in pain and knee-related symptoms over 6- and 12-mo periods. Scored from 0 to 100 with 100 indicating no pain.
Change in Long Distance Corridor Walk (LDCW) Time, Secs	0,3,6 and 12 months	The LDCW included both 2-min walk distance and 400-m walk time. This measure has been shown to be predictive of changes in community mobility. Per the LDCW protocol, for participants unable to walk 400 m, gait speed was estimated from the 2-min walk distance, so that all participant data were on the same scale.
Change in Stair Climb Time, Secs	0,3,6, and 12 months	Functional limitations specific to ascending stairs were assessed with a times stair climb, using a standard eight-stair flight (stair height = 19 cm)