Muscle fatigue occurs due to accumulation of-

Key Points

• Muscle fatigue occurs due to the accumulation of lactic acid in the muscles.
• Lactic acid is produced during anaerobic respiration when there is a lack of oxygen supply to the muscles.
• During intense exercise, the oxygen supply to the muscles is insufficient, leading to anaerobic respiration and the production of lactic acid.
• The accumulation of lactic acid lowers the pH within muscles, causing an acidic environment that contributes to the sensation of fatigue and discomfort.
• This mechanism allows the body to temporarily continue generating energy in the absence of sufficient oxygen but is not sustainable for long periods.

Additional Information

• Creatine phosphate acts as an energy reserve in muscle tissue but does not cause fatigue.
• Carbon dioxide is a byproduct of aerobic respiration and is expelled from the body through the respiratory system.
• CO, or carbon monoxide, is a toxic gas that can impair oxygen transport in the blood but is not typically associated with muscle fatigue.
• Proper hydration, nutrition, and conditioning can help manage and reduce muscle fatigue during physical activities.