Temperature can affect the rate at which an action potential is generated to excite an action potential within a given skeletal muscle. Maximum contraction is the ability of the muscle to recruit and produce its greatest force during a contraction, and we can observe these effects by using a grip force transducer, which records the functional grip force of the hand. Therefore, the purpose of this lab was to discern how varying temperatures affect maximum contraction. I hypothesized that; cold temperatures will decrease the rate of muscle fatigue and provide for a longer max contraction, while hot temperatures will increase the rate of muscle fatigue and decrease the length of a sustained max contraction.
The grip force transducer was calibrated, and a period of stable baseline and maximal force production was …show more content…
We found that colder conditions diminished the rate at which a muscle fatigues, while warmer conditions accelerated the rate at which a muscle fatigues, which agreed with my hypothesis.
Maximal contractile forces within a skeletal muscle are regulated by the force-length relationship, and the optimal overlap of actin and myosin filaments that produce the greatest force within the muscle. A muscle produces its greatest force when it is at its optimal or resting length, and its lowest force when the fibers are stretched or shortened. Contractile forces are regulated by the amount of adenosine triphosphate (ATP) and Ca2+ released from the sarcoplasmic reticulum (SR), and a maximum contraction is achieved when all motor units, specifically the fast twitch type IIb large fibers, are recruited and a stronger, more frequent action potential is sensed. These stronger and more frequent action potentials trigger excitatory forces within the motor neuron, and excite larger motor units to produce a maximum