Association Between Measures of Muscle Strength and Performance of Daily Activities in Patients with Knee Osteoarthritis.
Arjan De Zwart, Joost Dekker, Simon Verberne and 4 others
PMID 35775838WHAT IT FOUND
Isokinetic peak strength predicted walking, chair-rise and stair-climb performance better than estimated 1-RM in knee OA.
The expected activity-specific pattern for 1-RM was not found. These two strength measures reflect different constructs.
Key findings
01Isokinetic peak strength showed stronger associations with daily activity performance than estimated 1-RM across all analyses.
02The hypothesized rank order for estimated 1-RM associations with specific activities was rejected; walking was not more strongly associated with 1-RM than chair rising or stair climbing.
03The correlation between change in isokinetic peak strength and change in estimated 1-RM was negligible, suggesting they measure different constructs.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTs
Read the rest of this summary
You get three full summaries a month, free, and we do not ask for a card. Search, the TL;DRs and your library stay unlimited either way.
What it does not show
The physical therapist assessing estimated 1-RM was not blinded to treatment allocation, which could introduce bias in the strength measurements. The study was a secondary analysis of an RCT, not a primary trial designed to test the relationship between strength and function. The 10-RM test used to estimate 1-RM may not adequately capture the muscular endurance required for tasks like the 6-minute walk test. The sample included patients with vitamin D levels > 15 nmol/L, which may limit generalizability to severely deficient populations.
Declared interests
The authors have no conflicts of interest to declare.
The easy way to misread this
Do not assume that improving a patient's leg-press 1-RM will directly translate to better walking or stair-climbing performance. The study found that these two strength measures reflect different constructs and that changes in one did not correlate with changes in the other.