What is the cause of altered running technique leading to muscle fatigue and improper contraction?

Muscle fatigue is a primary cause of altered running technique, as it affects the neuromuscular system's ability to function efficiently. When muscles become fatigued, their capacity to contract and generate strength diminishes. This can lead to compensatory movements, resulting in improper form while running. For example, a runner may unconsciously adjust their stride to alleviate discomfort or compensate for weakened muscles, which can increase the risk of injury and further fatigue.

Fatigue can stem from various factors such as insufficient rest, excessive physical exertion, or inadequate nutritional support. Unlike dehydration, which primarily affects fluid balance, or improper footwear, which impacts comfort and biomechanics, fatigue directly influences the muscle's performance and ability to maintain effective contraction throughout an activity. Additionally, while overtraining is associated with fatigue, it specifically refers to a more complex condition that results from excessive training without adequate recovery, often leading to a more prolonged state of performance decline. Thus, fatigue stands out as the most direct cause of altered running technique impacting muscular performance.