Association Between Average Daily Activity Counts and Knee Osteoarthritis Progression.

Objective: To explore the relationship between daily activity counts and knee osteoarthritis (OA) progression.

Design: A cohort study using Osteoarthritis Initiative (OAI) data included 610 participants aged 45-79 years with knee OA or at risk. Daily activity counts were measured using ActiGraph GT1M accelerometers.

Adaptation of muscles of the lumbar spine to sudden imbalance in patients with lower back pain caused by military training.

Objective: This study aims to investigate the effects of sudden load changes (expected and unexpected imbalance) on the activity of muscles of the lumbar spine and their central motor control strategy in military personnel with or without chronic low back pain (LBP).

Design: Bilateral sudden imbalance was examined (2 × 2 factorial design).

Setting: The 117th PLA Hospital, Hangzhou, China

Participants: Twenty-one male subjects with lower back pain and 21 male healthy control subjects were active members of the Nanjing Military Region land forces.