Anaerobic exercise

Anaerobic exercise is brief, high-intensity physical activity powered mainly by energy systems that supply ATP without relying directly on oxygen. It includes efforts that quickly fatigue working muscles.

Phosphagen system: An energy system that rapidly regenerates ATP using phosphocreatine stored in muscle. It supplies immediate energy for explosive efforts lasting only a few seconds.
High-intensity interval training: Exercise structured as repeated hard work intervals separated by recovery periods. Its work intervals often rely heavily on anaerobic energy, especially at high intensity.
Aerobic exercise: Physical activity sustained primarily by energy production that uses oxygen. It relies more on oxygen-dependent metabolism and is generally sustainable for longer durations.
Muscular hypertrophy: An increase in the size of muscle fibers, often following repeated resistance training. Progressive high-intensity training can stimulate muscle growth when paired with recovery and nutrition.
Anaerobic glycolysis: The breakdown of glucose into pyruvate with ATP production that does not directly require oxygen. It supports intense efforts after phosphocreatine stores begin to run low.
Sprint interval training: A form of interval training using brief, near-maximal sprint efforts and recovery periods. It applies anaerobic demands through repeated all-out bursts.
Endurance training: Training designed to improve the ability to sustain physical activity over time. Its longer efforts emphasize aerobic capacity rather than brief maximal output.
Rate of force development: How quickly a muscle or muscle group can increase force after contraction begins. Explosive anaerobic training can improve the speed at which force is produced.
Lactate threshold: The exercise intensity above which blood lactate rises faster than the body can clear it. It helps describe when hard efforts become difficult to sustain.
Resistance training: Exercise in which muscles work against external resistance to improve strength or other physical capacities. Heavy sets commonly involve short, intense efforts supported by anaerobic pathways.

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