PBFR: Low Intensity Resistance Training With Partial Blood Flow Restriction for Quadriceps Strengthening

Sponsor

University of Iowa (Other)

Overall Status

Completed

CT.gov ID

NCT01311206

Collaborator

(none)

Enrollment

Location

Arms

3.9

Duration (Months)

12.7

Patients Per Site Per Month

Study Details

Study Description

Brief Summary

The objective of the proposed research is to assess the efficacy of an eight-week, efficient and tolerable, low-intensity resistance-training program with concurrent application of partial blood flow restriction (PBFR) for improving quadriceps strength and volume in women with risk factors for incident symptomatic or progressive knee OA. This specific aim will be achieved through a randomized, controlled trial, comparing low intensity training with and without PBFR. There have been numerous reports of exercise interventions in people with knee osteoarthritis. However, this research is novel in that it will be the first to use a low intensity regimen that will minimize forces on the knee while still having the potential to lead to clinically meaningful strength gains in older adults with risk factors for incident symptomatic or progressive knee OA.

Condition or Disease	Intervention/Treatment	Phase
Knee Osteoarthritis Symptomatic Knee Osteoarthritis	Other: partial blood flow restriction Other: Low intensity exercise without partial blood flow restriction	N/A

Study Design

Study Type:

Interventional

Actual Enrollment :

50 participants

Allocation:

Randomized

Intervention Model:

Parallel Assignment

Masking:

Double (Participant, Outcomes Assessor)

Official Title:

Determining Efficacy of a Tolerable Means of Strengthening for Older Adults With Knee Osteoarthritis: Partial Blood Flow Restriction Low Intensity Resistance Training

Study Start Date :

Feb 1, 2011

Actual Primary Completion Date :

Jun 1, 2011

Actual Study Completion Date :

Jun 1, 2011

Arms and Interventions

Arm	Intervention/Treatment
Experimental: PBFR Partial Blood Flow Restriction (PBFR) during Low-Intensity Exercise.	Other: partial blood flow restriction Partial Blood Flow Restriction (PBFR) Low-Intensity Exercise: using the Biodex 3 Dynamometer in isotonic mode at 10% (first 3 weeks), 15% (following 3 weeks) and 20% (final 3 weeks) of their 1RM for each side, while receiving PBFR in each exercising limb. The padded belts (65 mm in width and 650 mm in length) of the Kaatsu Master™ PBFR device (Sato Sports Plaza, Tokyo, Japan) will be applied to the proximal thigh as near to the hip joint as is comfortable. Before training each leg, subjects will be seated in a chair where an initial belt pressure of 37-40 mmHg will be applied. The belt then will be iteratively pressurized for 30 seconds and then relaxed for 10 seconds in increments of 20 mmHg from 100 mmHg to the final pressure of 160 mmHg. During exercise, the cuff pressure will be continuously controlled and monitored by the PBFR apparatus
Active Comparator: PBFR control Low-Intensity Exercise without partial blood flow restriction.	Other: Low intensity exercise without partial blood flow restriction Low-Intensity Exercise: using the Biodex 3 Dynamometer in isotonic mode at 10% (first 3 weeks), 15% (following 3 weeks) and 20% (final 3 weeks) of their 1RM for each side in each exercising limb without partial blood flow restriction.

Arm

Intervention/Treatment

Experimental: PBFR

Partial Blood Flow Restriction (PBFR) during Low-Intensity Exercise.

Other: partial blood flow restriction

Partial Blood Flow Restriction (PBFR) Low-Intensity Exercise: using the Biodex 3 Dynamometer in isotonic mode at 10% (first 3 weeks), 15% (following 3 weeks) and 20% (final 3 weeks) of their 1RM for each side, while receiving PBFR in each exercising limb. The padded belts (65 mm in width and 650 mm in length) of the Kaatsu Master™ PBFR device (Sato Sports Plaza, Tokyo, Japan) will be applied to the proximal thigh as near to the hip joint as is comfortable. Before training each leg, subjects will be seated in a chair where an initial belt pressure of 37-40 mmHg will be applied. The belt then will be iteratively pressurized for 30 seconds and then relaxed for 10 seconds in increments of 20 mmHg from 100 mmHg to the final pressure of 160 mmHg. During exercise, the cuff pressure will be continuously controlled and monitored by the PBFR apparatus

Active Comparator: PBFR control

Low-Intensity Exercise without partial blood flow restriction.

Other: Low intensity exercise without partial blood flow restriction

Low-Intensity Exercise: using the Biodex 3 Dynamometer in isotonic mode at 10% (first 3 weeks), 15% (following 3 weeks) and 20% (final 3 weeks) of their 1RM for each side in each exercising limb without partial blood flow restriction.

Outcome Measures

Primary Outcome Measures

Change in isokinetic knee extensor strength after 9-week intervention [Outcome will be measured at week 0 (baseline) and approximately 10 weeks later (after completion of 9-week intervention)]
This outcome will measure efficacy of 9-week intervention.

Secondary Outcome Measures

Change in quadriceps volume assessed by MRI after completion of 9-week intervention [outcome will be measured at week 0 and at approximately week 10 (after completion of 9-week intervention)]
This outcome will measure efficacy of the 9-week intervention.

Eligibility Criteria

Criteria

Ages Eligible for Study:

45 Years to 60 Years

Sexes Eligible for Study:

Female

Accepts Healthy Volunteers:

Yes

Inclusion Criteria:

Female
Age 45-60
BMI less than 37 and greater than or equal to 25 kg/m2, or a history of a knee joint injury or surgery, or knee symptoms (pain, aching, or stiffness) on most of the last 30 days, or knee osteoarthritis

Exclusion Criteria:

Resistance training at any time in the last 3 months prior to study
5° malalignment of a knee
Bilateral knee replacement
Lower limb amputation
Lower limb surgery in the last 6 months that affects walking ability or ability to exercise
Back, hip or knee problems that affect walking ability or ability to exercise
Unable to walk without a cane or walker
Unable to ascend at least 2 stairs (to enter our building)
Inflammatory joint or muscle disease such as rheumatoid or psoriatic arthritis or polymyalgia rheumatica
Multiple sclerosis
Known neuropathy
Self-report of Diabetes
Currently being treated for cancer or having untreated cancer
Terminal illness (cannot be cured or adequately treated and there is a reasonable expectation of death in the near future)
Peripheral Vascular Disease
History of myocardial infarction or stroke in the last year
Deep Venous Thrombosis
Chest pain during exercise or at rest
Use of supplemental oxygen
Inability to follow protocol (e.g. lack of ability to attend visits or understand instructions)
Staff concern for subject health (such as history of dizziness/faintness or current restrictions on activity)
Concurrent study participation (such as the MOST study)
Planning to be away for more than one week during the study