Reporter: Cassie Silver

Most people say they've worked up an appetite, now science is proving it might not be the case.

Murdoch lecturer, DR Tim Fairchild has linked exercise and diet in a whole new way. "If we always exercise to the same intensity over a period of time the body gets used to it and the body no longer responds to it"

The longer we exercise, not necessarily better for our bodies. "To see whether or not we could trick the system so it wouldn't eat as many calories after the exercise"

UWA PHD candidate Aaron Sim is here to put 4 participants through their paces.

30 minutes of constant cycling for Paul and Gillian and intense intervals for Jono and Karen.

Then we're counting the calories.

Intervals allow for rest time between short sprints.

Meaning all four of our riders use the same energy and complete the same amount of work by the end of the half hour.

Tim says "interval training is really important because it gets your body used to running at a faster pace"

Then it was off to the breakfast buffet. How much did they eat? Those results soon.

First, it was brains over bellies

Continuous cyclers Paul and Gillian they had plenty of time to focus on food.

Paul says "before I was around 7 out of 10 i would say more an 8 or 9 now"

Gillian says "I've been riding for half an hour thinking about food I'm certainly more hungry"

The interval training tummies spoke for themselves

Jono says "I started off with a 9 out of 10 hunger but now i don't even feel 5 really"

Tim says "What our research found was the higher the intensity the less hungry people feel after the exercise"

The Average Hunger Rating for continuous riding went from 49 before exercising--up to 56 after the 30 minutes.

For the interval trainers they went from a 54 rating of hunger down to just 18 after they completed intense interval.

Tim says "When you exercise at a low intensity you seem to release a lot of these hunger chemicals when you exercise at a higher intensity you seem to not release the same number of these chemicals"

On Day two the 4 made the swap.

To ensure fair and accurate results, everything was controlled from health to heart rates.

Unfortunately for Paul, his decision to train intensely the night before caught up with him. Tim says "what Paul experienced is something called hypoglycaemia which is when the blood sugar levels go really low and the body says I've had enough I need to jump off now"

Although the fittest, Paul was removed. As for the other three their tummies took a turn too.

Jono says "i am more hungry now then what I was after the intervals definitely"

Today food was the last thing on fast paced Gillian's mind. "Today with the intervals I am less hungry I think I have been concentrating on what I am doing and not thinking of food as much"

So how much did everyone eat..? The results were staggering

Gillian ate 457 calories after her 30 minutes of continuous riding.

After interval training she at 363 calories- 94 less.

Karen ate 339 calories after 30 minutes at the same pace.

With intervals she only at 290 calories 43 calories less

As for Jono he ate a whopping 629 calories after the standard ride.

After intense intervals it was just 455 calories.

And the effects of interval training are long term. Tim says "what we found was those that did the high intensity not only ate less in the first meal but also ate less through the next 24 hours. So ultimately 100 calories a day means 700 calories a week and it adds up pretty quickly and over the course of the years it 3-4 kilos of pure fat"

With the HBF run for a reason around the corner, Tim and Aaron say people need to change their routines.

And it's time to train smarter.

Tim says "Start to incorporate some interval training and that can be as simple as running up hills or running a little faster than they normally would and then backing it off a little bit"

The HBF run for a reason is on May 26th. To sign up and for more training tips visit their website


Also UWA are currently recruiting participants for their second study, if you would like to take part contact

Aaron Sim BSc (Hon) ESSAM AEP

PhD Candidate

School of Sport Science, Exercise and Health

The University of Western Australia

35 Stirling Highway, Crawley, WA 6009

Mobile: 0421516193