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Greater efficiency of muscle contractions is not a mechanism associated with heat acclimation. Heat acclimation refers to the physiological adaptations that occur when the body is exposed to high temperatures for extended periods. These adaptations primarily focus on enhancing thermoregulatory function and improving the ability to cope with heat stress.

Increased blood volume supports better circulation and helps maintain temperature regulation during exercise in the heat, while an increased size of sweat glands allows for more effective cooling through sweat evaporation. Additionally, an earlier onset of sweating allows the body to start cooling off sooner, which is critical for maintaining performance and reducing heat-related risks.

While muscle contractions are crucial for physical performance, their efficiency is typically a result of training, skill development, and muscle conditioning rather than a physiological response to heat acclimation. Hence, this option does not directly pertain to the body's adaptation to heat exposure.