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Search glossary terms

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Lactic acid

[lak-tik as-id]

Phonetic (Standard)

/ˈlæktɪk ˈæsɪd/

IPA

Noun

Defintion for Lactic acid

A byproduct of anaerobic metabolism, lactic acid is produced in muscle cells during intense exercise when oxygen levels are low, leading to muscle fatigue.

Long Definition

Lactic acid is a byproduct of anaerobic metabolism, produced when the body breaks down carbohydrates for energy without enough oxygen. It accumulates during intense exercise, leading to muscle fatigue and soreness. Runners experience a "lactate threshold," the intensity at which lactic acid builds up faster than it can be cleared. Training can raise this threshold, allowing for sustained higher-intensity efforts. For example, elite marathoners can maintain a pace just below their lactate threshold for long periods. Understanding and improving lactate threshold is crucial for enhancing endurance and performance in distance running.

kaizen Insights

The burning feeling in hard efforts is linked to metabolic by-products, not lactic acid alone, and it clears quickly after you slow down. Balancing hard and easy running helps you adapt.

Category

Physiological Terms

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