The rate of force development (RFD) is the standard measure for quantifying the quickness of a muscle contraction. It refers to the ability to increase force as quickly as possible during a rapid voluntary contraction. This is also called explosive strength, and it has many important roles in many sport performances that require forceful muscle actions such as jump, throwing or sprinting. However, the capacity to produce quick muscle contractions is important not only for sport performances but also for the activity of daily life. Indeed, most activity of daily life, like walking, raising from a chair, climbing stairs, or stepping apart to avoid a fall, are also based on the capacity to produce force in brief amounts of time. The voluntary rate of force development is an important physiological variable and it is extremely interesting to be monitored to detect early signs of muscle damage, muscle fatigue, and muscle performance impairments due to ageing.
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