The effect of stationary cycling exercise on lessening severity of knee symptom was identified at the 4'h week of the intervention. Stationary cycling exercise is an exercise modality for people with osteoarthritis who cannot participate in weight-bearing exercise!"" One effect of stationary cycling exercise is that quadriceps muscle is strengthened; " and then , quadriceps muscle helps keeping knee joints from becoming stiffer, providing support, making knee movement easier, and reducing pain.'" In addition, Mangione and colleagues '" also revealed that either low or high intensity cycling could improve function and gait, decrease pain, and increase aerobic capacity in older adults with osteoarthritis of the knee. However, significant difference between groups was detected only in the 4th week. One possible factor contributing to the non-significant difference of the M-SEV score between groups at the 8th and 12th week was related to the inclusion criteria. All participants had a little