Muscle contraction is the tightening, shortening, or lengthening of muscles when you do some activity. It can happen when you hold or pick up something, or when you stretch or exercise with weights.

Muscle weakness may be due to a chronic condition or an infection. Conditions that can weaken muscles include Addison’s disease, anemia, diabetes, fibromyalgia, and more. Muscle weakness is a lack of ...

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Muscle atrophy frequently complicates the course of chronic kidney disease (CKD) and is associated with excess morbidity and mortality CKD-induced mechanisms that cause muscle atrophy include ...

Muscle loss is a common part of aging. For people over 60, maintaining or developing muscles can help prevent falls, maintain mobility, and prevent loss of function. This may be possible through ...

The core components of health-related fitness include cardiovascular and muscular endurance, flexibility, and your body’s ratio of fat compared to muscle and bone. It’s well known that being ...

Human movement is reciprocal in nature: Opposing muscle groups must coordinate for proper movement. Muscle length and strength between opposing muscle groups need to be in balance for normal movement ...