Which of the following practices is important for athletes during a heat acclimatization period?

The practice of gradually introducing increased workout intensity is vital during a heat acclimatization period because it allows the athlete's body to adapt safely to higher temperatures and humidity. During acclimatization, physiological changes occur, such as improved cardiovascular responses and increased plasma volume, which help the body better manage heat stress.

By gradually increasing both the intensity and duration of workouts, athletes can enhance their sweat response and thermoregulation, thereby reducing the risk of heat-related illnesses. This strategic acclimatization helps ensure that athletes can perform effectively in warmer conditions without overwhelming their bodies, facilitating a smoother transition as conditions become more challenging.

Focusing on other approaches, such as increasing the duration of breaks, while beneficial in certain contexts, does not actively promote acclimatization as effectively as the gradual increase in intensity. Daily cold showers might provide temporary relief but do not aid the body's adaptation to heat. A high-sugar diet can lead to energy spikes and crashes, which does not contribute positively to hydration or the necessary adaptations during heat exposure.