Which of the following is NOT a typical muscle group stimulated by FES bicycle systems?

• A. Gluteus maximus, hamstrings, quadriceps
• B. Tibialis anterior, gastrocnemius
• C. Deltoid, trapezius
• D. Biceps, triceps

Answer: (D)

FES bicycle systems are designed to produce pedaling motion by activating leg muscles that drive the knee and hip, with supporting ankle actions to optimize the pedal stroke. The typical targets are the gluteus maximus, hamstrings, and quadriceps for hip and knee movement, along with the tibialis anterior for foot clearance and the gastrocnemius for plantarflexion. Upper-body muscles like the deltoids and trapezius aren’t part of the pedaling action, and arm muscles such as the biceps and triceps don’t contribute to cycling motion in these systems. So, those arm-focused muscle groups aren’t typical targets for standard FES cycling.