the length of the muscle changes. Muscle Physiology Lab Assignment Part I: Muscle Twitch The latent period is the time from the initial stimulation to the start of the muscle contraction. Muscle shortening velocity. An isotonic contraction of a muscle is one in which. Latent period: It is the period of no contraction and lasts for about 0.01 seconds. The latent period is a short delay (1-2 msec) from the time when the action potential reaches the muscle until tension can be observed in the muscle. This takes approx. There is a delay, or latent period, of about 2 milliseconds (msec) between the onset of the stimulus and the onset of the twitch. Latent period is the time lapse that occurs between application of stimulus and its targeted effect. During the lag phase a signal called an action potential moves to the end of the motor neuron (axon terminal). Load lengthens the latent period but reduces the periods of contraction and relaxation. Muscle - Muscle - Twitch and tetanus responses: Skeletal muscles respond to a single electric shock of sufficient magnitude by rapid, intense contractions called phasic contractions. During the latent period of muscle contraction Ca++ is being released from the sacroplasmic reticulum and filament movement is taking up slack. E. G when a nerve impulse arrives on a muscle fiber (stimulus), it takes a few milliseconds before the muscle begins to contract. . decreases with heavier loads. The Latent Period of Skeletal Muscle This prevents any distortion such as was found to occur if the free end of the wire rested on a knife edge. 0 0 1. 6.10). The delay occurs as the neurotransmitter delivers the action potential and engages the myofilaments (actin and myosin) in the muscle fiber. The effect of load on the work done by the muscle depends on the way in which the load is applied. Another cross bridges cycle and, when muscle tension exceeds the load, muscle shortening occurs. Phase of shortening or contraction: It is the phase when work is done. 1, B), to which the muscle is attached when pulling vertically. It lasts for about 0.04 seconds. It also reduces the degree of contraction, i.e., the height of the curve (Fig. The time between the activation of a motor neuron until the muscle contraction occurs is called the lag phase (sometimes called the latent phase). 2 milliseconds. the latent period increases with heavier loads. Latent myofascial trigger points (MTrPs) do not cause spontaneous pain; however, they may lead to a limited range of motion and muscle weakness. Soldered at right-angles (horizon-tally) atthis endofthetorsionwireis ashort, slottedlever-arm(fig. 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