Frequency of stimulation and force Recruitment of motor units and force

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✔ https://HomeworkClinic.com • ✔ https://Videos.HomeworkClinic.com • ✔ Ask questions here: https://HomeworkClinic.com/Ask • Follow us: • ▶ Facebook: / homeworkclinic • ▶ Review Us: https://trustpilot.com/review/homewor... • • Muscle tension depends on the frequency of stimulation. • • Muscle twitch: First stimulus. • • Wave summation: When a second stimulus excites a partially relaxed muscle, producing a stronger contraction. • • Unfused tetanus: Successive stimulations at the same frequency, producing a series of contractions with increasing tension. • • Fused tetanus: Rapid stimulations without muscle relaxation, producing a smooth, sustained contraction. • Recruitment of motor units and force • • An increase in number of motor units involved in contraction increases contraction force of the muscle. • • Threshold stimulus: Activates single motor unit to produce a very small force of contraction. • • Submaximal stimulus: Activates multiple recruited motor units to produce a greater force of contraction. • • Smaller and weaker motor units are recruited first. Larger and stronger motor units are added as needed. • • Maximal stimulus: Activates all motor units to produce maximum contraction force. • • A muscle under maximal stimulus can only contract for a short time. • Recruitment (asynchronous) of motor units and force • • Alternately contracting motor units allow the muscle to sustain contraction for longer periods of time. • • This method of recruitment, known as asynchronous recruitment, allows the individual motor units time to recover from contraction. They recover by regenerating more ATP during their period of relaxation. • Recruitment of motor units - muscle tone • • Muscle tone is a firmness (partial contraction) sustained by small groups of alternately contracting motor units. These contractions are not strong enough to produce movement. • • Muscle tone is important to maintain muscle health and in situations where muscles maintain position or pressure. • • If neural damage occurs, then muscle tone will diminish and muscle cells will become flaccid.

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