Final answer:
Muscle fiber recruitment involves the activation of motor units within a muscle and is important for generating the necessary force for a maximal gallop. By recruiting motor units in a specific pattern, the nervous system can sustain muscle contractions while minimizing fatigue.
Step-by-step explanation:
Muscle fiber recruitment refers to the activation of motor units within a muscle. When a muscle contracts, the nervous system recruits motor units to generate the necessary force. In the case of a maximal gallop, the maximal number of motor units in the muscle are recruited simultaneously, resulting in the maximum force of contraction for that muscle.
However, this level of recruitment cannot be sustained for long periods due to the energy requirements. To prevent muscle fatigue, some motor units rest while others are active, allowing for longer contractions. This recruitment pattern allows the nervous system to efficiently utilize the muscle and sustain the gallop.