Determine which student experienced psychological fatigue and which student experienced physiological fatigue. Explain your answer (which student was which fatigue and why?).

6. EMG Demonstration – Fatigue: Recall that in psychological fatigue, muscles lost tension due to a lack
of acetylcholine. More completely, the loss of acetylcholine is due to fewer action potentials being sent
down the neuron. In physiological fatigue, although the number of action potentials traveling down the
neuron remains the same even during fatigue, the muscle loses strength due to depleting levels of ATP.
With that knowledge, consider the following data for two students.
Student 1:
                                           EMG (mV)                                            Dynamometer (kg)
Pre-fatigue                             0.75                                                             0.6
Post-fatigue                           0.75                                                             0.3

 

Student 2:
                                            EMG (mV)                                            Dynamometer (kg)
Pre-fatigue                                0.80                                                          0.7
Post-fatigue                               0.40                                                         0.35