Final answer:
The acute variables of Phase 2: Strength Endurance involve training with intensities between 70-85% of 1RM to balance the development of muscular strength and endurance. This moderate intensity level allows for higher repetition volume, key for building muscular endurance by maintaining tension on muscles for longer periods.
Step-by-step explanation:
The acute variables of Phase 2: Strength Endurance training relate to a specific approach to exercise programming that emphasizes the ability of muscles to exert force consistently over time. Specifically, intensity is referenced in the context of resistance training and is typically expressed as a percentage of the 1-repetition maximum (1RM), which is the maximum weight an individual can lift for one repetition of a given exercise. In the strength endurance phase, the intensity is often set at 70-85% of 1RM, which balances the load to promote both muscular strength and endurance development.
This intensity level is more moderate compared to maximum strength protocols and is designed to allow a higher volume of repetitions, thereby increasing the time the muscles are under tension. This prolonged tension is crucial for building muscular endurance, as it challenges the muscle's ability to sustain repeated contractions against resistance over an extended period. Training within this intensity range is effective for building a strong foundation and is common in routines aiming to enhance functional fitness and overall muscular performance.