Final answer:
In Phase 3: Hypertrophy Tempo, a controlled tempo is typically used to maximize muscle growth by increasing time under tension rather than a fast and explosive tempo.
Step-by-step explanation:
The acute variables of Phase 3: Hypertrophy Tempo refer to the speed and rhythm with which resistance training exercises are performed to optimize muscle growth. In hypertrophy training, tempo can affect the time under tension a muscle experiences, and different tempos can be employed to target muscle growth effectively.
Option b) Fast and explosive is typically associated with power training rather than hypertrophy. Hypertrophy training usually involves a slower, more controlled tempo to maximize time under tension and promote muscle growth. This would involve a moderate pace on both the concentric (lifting) and eccentric (lowering) parts of an exercise, to enhance muscle fiber recruitment. The acceleration phase, a term you've provided, is seemingly unrelated to the question of hypertrophy tempo but generally refers to a stage of rapid change or growth in a biological or business context.