In hyperactive children the arms must first be restrained by holding them tight in our hands. Montessori Elementary Materials Maria Montessori We must stimulate the apathetic and the sluggish; we must moderate the hyperactive; we must correct paresis, tics, etc.
Isotonic contractions are those which cause the muscle to change length as it contracts causing movement. There are two types of isotonic contraction: -. Concentric. A concentric contraction is a type of muscle contraction in which the muscles shorten while generating force.
Individual muscle fibers contract to their fullest extent; they do not partially contract, this follows the all or none principle. A twitch contraction is a brief contraction of all the muscle fibers in a motor unit in response to a single action potential.