Researchers showed a group of subjects a number of comedy videos and a number of documentaries. They found that subjects that had recently been laughing were able to withstand up to 10% more pain than they had done before watching the videos. The researchers took what they referred to as a proxy measurement, which tested the pain threshold for each volunteer. This involved placing a bag of ice on their arms to see how long they could withstand it. The greater the increase in pain threshold, the greater the amount of endorphins produced. Which of the following statements is not true, based on the above?