Improved Function and Reduced Pain after Swimming and Cycling Training in Patients with Osteoarthritis

Alkatan M, et al. · The Journal of Rheumatology

Both arms improved against their own baselines: WOMAC pain, stiffness and functional limitation all fell (p<0.001), 6-minute walk distance rose 6% with cycling and 8% with swimming, and grip strength and isokinetic knee extensor and flexor strength rose in both, by 15-30%. For swimming the WOMAC reductions were about 40% for pain, 30% for stiffness and 25% for functional limitation, which the authors note clears the minimal clinically important threshold. Nothing separated the two modes on any measure.

Population

48 sedentary middle-aged and older adults with Kellgren-Lawrence grade I-III radiographic OA, 2 men and 22 women in each arm; 4 dropped out of each arm and the analysis was by intention to treat

Intervention

12 weeks supervised swimming, 45 min 3x/week at 60-70% HRR

Comparator

A matched cycling programme, which the authors treat as the land-based comparator; there is no non-exercise arm

Limitations

Small, short and across mixed OA sites, with no non-exercise arm: every significant result is a within-group change over 12 weeks, so time, attention and regression to the mean are not excluded, and the only controlled comparison the trial makes is swimming against cycling. Attendance ran at 97-98% under supervision, which is not what an unsupervised programme would produce.