Auxotonic

Auxotonic

Auxotonic refers to a type of muscle contraction in which the tension within the muscle changes as the muscle length changes. This is a common type of contraction that occurs during many everyday activities and exercises. Understanding auxotonic contractions is important in the fields of physiology, biomechanics, and sports medicine.

Physiology of Auxotonic Contractions

Auxotonic contractions are characterized by a change in muscle tension as the muscle changes length. This is in contrast to isometric contractions, where the muscle length remains constant, and isotonic contractions, where the muscle tension remains constant.

During an auxotonic contraction, the muscle undergoes both concentric and eccentric phases. In the concentric phase, the muscle shortens as it generates force, while in the eccentric phase, the muscle lengthens while maintaining tension. This type of contraction is typical in activities such as lifting weights, where the muscle must adapt to varying loads and angles of movement.

Examples of Auxotonic Contractions

Auxotonic contractions are prevalent in many forms of physical activity. For example:

• Bicep Curl: When performing a bicep curl, the biceps brachii muscle experiences auxotonic contraction. As the weight is lifted, the muscle shortens (concentric phase), and as the weight is lowered, the muscle lengthens (eccentric phase).

• Running: During running, the muscles of the legs undergo auxotonic contractions to propel the body forward and absorb impact forces.

• Cycling: The pedaling motion in cycling involves auxotonic contractions of the quadriceps and hamstrings as they work to move the pedals in a circular motion.

Clinical Relevance

Understanding auxotonic contractions is crucial in rehabilitation and physical therapy. Therapists often design exercise programs that incorporate auxotonic movements to improve muscle strength, endurance, and coordination. Additionally, recognizing the role of auxotonic contractions can help in the prevention and treatment of muscle injuries.

Research and Studies

Research in the field of muscle physiology often explores the effects of auxotonic contractions on muscle growth and adaptation. Studies have shown that auxotonic exercises can lead to significant improvements in muscle hypertrophy and strength compared to other types of contractions.

Also see

• Muscle contraction
• Isometric exercise
• Isotonic exercise
• Eccentric training
• Concentric training