Which statement best describes the goal of energy-saving strategies in gait?

Which statement best describes the goal of energy-saving strategies in gait?

• A. Increase the speed of arm swing
• B. Minimize vertical fluctuations of the body's center of mass
• C. Increase hip abduction during stance
• D. Increase knee extension in swing

Answer: (B)

In gait, energy-saving strategies aim to reduce the muscular work needed to move the body by keeping the center of mass moving with as little vertical motion as possible. When the center of mass rises and falls a lot, muscles must work harder to lift and lower the body, increasing energy expenditure. By minimizing vertical fluctuations, the body better uses the pendulum-like dynamics of walking, allowing momentum and energy to be exchanged efficiently between steps. This makes forward progression require less metabolic cost. Increasing arm swing speed, hip abduction during stance, or knee extension in swing would not directly reduce that vertical work and can even add unnecessary energy cost.

In gait, energy-saving strategies aim to reduce the muscular work needed to move the body by keeping the center of mass moving with as little vertical motion as possible. When the center of mass rises and falls a lot, muscles must work harder to lift and lower the body, increasing energy expenditure. By minimizing vertical fluctuations, the body better uses the pendulum-like dynamics of walking, allowing momentum and energy to be exchanged efficiently between steps. This makes forward progression require less metabolic cost. Increasing arm swing speed, hip abduction during stance, or knee extension in swing would not directly reduce that vertical work and can even add unnecessary energy cost.