What condition refers to powerful contractions supplied by large motor units?

The condition that refers to powerful contractions supplied by large motor units is strength training. This type of training focuses on increasing muscle strength and size by engaging larger motor units, which contain more muscle fibers. When you perform exercises designed for strength training, you typically lift heavier weights or engage in lower-repetition, high-load activities. This recruits large motor units to generate significant force, allowing you to build strength more efficiently.

In contrast, endurance training emphasizes sustaining prolonged physical activity rather than generating maximum force; it typically utilizes smaller motor units. Flexibility training focuses on improving the range of motion in joints and doesn't involve the same recruitment patterns as strength training. Cardiovascular training is primarily designed to enhance heart and lung efficiency through sustained aerobic activity, which again does not recruit large motor units in the way strength training does.