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Skeletal Muscle Adaptations to Low-Load Resistance Exercise Combined with Blood Flow Restriction in Older Adults with Knee Osteoarthritis
Başlık:
Skeletal Muscle Adaptations to Low-Load Resistance Exercise Combined with Blood Flow Restriction in Older Adults with Knee Osteoarthritis
Yazar:
Layne, Andrew Steven, author.
ISBN:
9780438120679
Yazar Ek Girişi:
Fiziksel Tanımlama:
1 electronic resource (112 pages)
Genel Not:
Source: Dissertation Abstracts International, Volume: 79-11(E), Section: B.
Özet:
Skeletal muscle weakness is a primary contributor to pain, functional decline and disease progression among older persons with knee osteoarthritis (OA). Thus, resistance exercise is commonly used as a preventative and rehabilitative intervention in this population. High-load resistance exercise performed with >60% of one-repetition maximum (1RM) is the best-known intervention for improving skeletal muscle strength. However, persons with OA may be unable to perform high-load exercise due to pain and joint compression. As a result, interventions are needed that are capable of increasing strength while utilizing low loads. One potential strategy is the addition of blood-flow restriction (BFR) to low-load training. This strategy is effective for increasing skeletal muscle strength relative to low-load training alone in healthy adults. Thus, the objective of this randomized, single-masked pilot trial was to evaluate the efficacy and feasibility of BFR training for improving skeletal muscle strength and physical function among older adults with knee OA. A total of 30 participants aged ≥60 years with symptomatic knee OA were randomly assigned to twelve weeks of center-based, traditional resistance exercise (CNTRL, 60% 1RM to volitional fatigue) or BFR (20% 1RM). Study outcomes included changes in 1) 1RM 2) isokinetic knee extensor strength 3) objective (Short Physical Performance Battery (SPPB), 400m walk) and subjective measures of physical function (Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) and Late Life Function and Disability Instrument (LLFDI)) 4) body composition 5) gait parameters and 6) serum markers of muscle hypertrophy. Changes in 1RM and isokinetic knee extensor strength were not statistically significantly different between groups (time*condition interactions p>0.05) but tended to favor the CNTRL intervention. Similarly, changes in 400m walk and subjective function as assessed by LLFDI tended to favor the CNTRL intervention, whereas changes in WOMAC stiffness favored the BFR intervention. Changes in SPPB and gait parameters were similar between groups. Furthermore, changes in total lean mass, fat mass and body fat percentage tended to favor CNTRL. Serum P3NP was significantly higher in CNTRL relative to BFR, while serum IGF1 was similar between groups. Serum TWEAK tended to be lower CNTRL relative to BFR. Finally, P3NP demonstrated moderate to strong correlations with eccentric knee extensor force characteristics, while TWEAK was positively associated with 400m walk speed and negatively associated with changes in body fat. These findings indicate that the CNTRL intervention tended to be more efficacious for strength and function in persons with knee OA. However, results should be interpreted with caution as this trial was not fully powered to detect differences in these outcomes.
Notlar:
School code: 0070
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Yer Numarası | Demirbaş Numarası | Shelf Location | Lokasyon / Statüsü / İade Tarihi |
---|---|---|---|
XX(696609.1) | 696609-1001 | Proquest E-Tez Koleksiyonu | Arıyor... |
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