the latent period increases with heavier loads. Latent period: It is the period of no contraction and lasts for about 0.01 seconds. Soldered at right-angles (horizon-tally) atthis endofthetorsionwireis ashort, slottedlever-arm(fig. E. G when a nerve impulse arrives on a muscle fiber (stimulus), it takes a few milliseconds before the muscle begins to contract. 1, B), to which the muscle is attached when pulling vertically. During the latent period for an isotonic concentric contraction. The effect of load on the work done by the muscle depends on the way in which the load is applied. Phase of relaxation: It is the phase when muscle returns to its previous relaxed state, and recovery is … Muscle - Muscle - Twitch and tetanus responses: Skeletal muscles respond to a single electric shock of sufficient magnitude by rapid, intense contractions called phasic contractions. There is a delay, or latent period, of about 2 milliseconds (msec) between the onset of the stimulus and the onset of the twitch. 6.10). Another Latent period is the time lapse that occurs between application of stimulus and its targeted effect. decreases with heavier loads. 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. It lasts for about 0.04 seconds. This takes approx. cross bridges cycle and, when muscle tension exceeds the load, muscle shortening occurs. Muscle shortening velocity. The time between the activation of a motor neuron until the muscle contraction occurs is called the lag phase (sometimes called the latent phase). This is the time required for excitation, excitation-contraction coupling, and tensing of the series-elastic components of the muscle. If the ends of a frog sartorius muscle (at 0 °C) are fixed to prevent shortening, the tension increases for about 200 milliseconds and then begins to decrease, at first rather rapidly and then more slowly. During the latent period of muscle contraction Ca++ is being released from the sacroplasmic reticulum and filament movement is taking up slack. 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. 2 milliseconds. 0 0 1. the length of the muscle changes. Load lengthens the latent period but reduces the periods of contraction and relaxation. During the lag phase a signal called an action potential moves to the end of the motor neuron (axon terminal). 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. Phase of shortening or contraction: It is the phase when work is done. 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