Final answer:
Anaerobic exercise is the term used to describe exercise performed on machines such as nautilus equipment that provides a variable amount of resistance during the course of a dynamic contraction. Anaerobic exercise is any physical activity performed at close to maximum muscle contraction strength for short periods, such as using resistance machines, which leads to muscle and bone mass and strength increase.
Step-by-step explanation:
The term used to describe exercise performed on machines such as Nautilus equipment that provides a variable amount of resistance during the course of a dynamic contraction is anaerobic exercise. Anaerobic exercise involves activities where muscles are used at close to their maximum contraction strength, but for a relatively short period of time, such as lifting weights. It engages a high percentage of fast-twitch muscle fibers, which consume a small amount of oxygen.
Muscles undergoing anaerobic exercise experience an increase in myofibrils, leading to muscle fiber thickness and consequently, muscle hypertrophy or enlargement. This kind of exercise is beneficial for increasing muscle and bone mass and strength. Isotonic contractions, including both concentric and eccentric types, are often involved in resistance training where the muscle maintains tension or changes length to move a load.