True or False: Some studies indicate the heart rates at submaximal levels remain consistent with land when performing deep-water exercises.

The statement is true because research has shown that heart rates during submaximal exercise tend to be similar when comparing land-based activities to deep-water exercises. This consistency in heart rate suggests that the cardiovascular response to exercise does not significantly change when moving from land to water, particularly in controlled conditions where the intensity of the exercises is matched. Deep-water exercises may involve buoyancy and resistance that can alter perceived exertion and biomechanics, but heart rate responses remain similar at submaximal levels. These findings indicate that individuals can achieve comparable cardiovascular benefits from deep-water exercises as they would from traditional land-based activities.

In contrast, the other options suggest either a misunderstanding or lack of evidence regarding the relationship between the two exercise environments. There is sufficient research to support the observed similarities in heart rates at submaximal levels, making 'true' the most accurate choice.