Tagged: physiology

Perceived Effort and Actual Effort

October 28th, 2013 in Article 0 comments


Frank Shorter and Bill Rodgers, Marathon Runners


Have you ever sat down to write a paper at 10pm the night before it is due? It is like setting out to run a marathon. You have all your necessary snacks lined up on the desk, the perfect playlist is on, breaks are not an option, and it will probably take you around 5 hours (more or less depending how much research and dedication you prepared for this moment). Most people are more likely to encounter this type of marathon than an actual marathon; however, according to a recent research in the field of psychophysiology, marathons require just as much mental effort as the aforementioned paper.

Samuele Marcora, a professor and researcher at the University of Kent, has recently theorized that the perceived mental effort during physical activity is just as important as how strenuous as the activity actually is. Previously, the common idea has relied on the afferent feedback model – “that perception of effort results from the complex integration of sensory signals from the active muscles and other organs” and relies little on what the person actually perceives to be difficult. In the general field of exercise physiology, it has been assumed that once a subject exerts a certain amount of energy, exhaustion is reacted because there are no more stores of energy to draw upon. Marcora’s studies are beginning to prove that this previously assumed idea is not the case. Marathon runners are still able to function after a marathon, before refueling, even though they may not have been able to push any harder during the race. This is just one example of how there may be enough glycogen (units of energy) yet the runner is unable to keep pushing harder.  According to these new studies, the actual energy available to a person during strenuous exercise, if there is enough glycogen present, relies on the person’s ‘brain strength’ to push past the mental boundaries caused by negative thoughts, boredom, and a build up of neurotransmitters – something that Marcora believes that runners can train to become easier.


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Run Crustaceans, Run!

November 8th, 2011 in Article 0 comments

When humans fall ill, we can go to the doctor to receive a diagnosis and treatment. We have a form of communication, and our body has good indicators that can help the doctor diagnose the problem. But what happens when we are trying to diagnose organisms that have no way to tell us what is wrong, and no way of knowing how badly they are affected? For instance, in the case of many marine organisms, illness is being caused by humans. We have used our oceans such that they now contain areas with little to no oxygen, where life is barely sustainable. How does this, combined with ongoing pollution and human activities, stress marine life? More

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