What energy systems does your body use to support the 100s trial in the experiment? refer back to information presented in activity 4.4.1?

In the beginning, the body used up the ATP energy in muscles to support the enduring muscle contraction. Once the ATP is finished,  the body had to switch to lactic acid fermentation in order to support a continued muscle contraction.

The answer is joseph is observing the colour of the reaction mixture to see whether proteins are present in the given solution.