Physiology Help Needed Please

**Ak_88** · 01-18-2007, 08:23 AM

Working my way through a lab report and i'm in need of some help explaining something.

Basic principle of the lab session was to find out what effect exercise intensity had on substrate utilisation.

After reading through some journals, it looks to be quite concrete that increasing intensity from low to moderate does not cause any increase in fat utilisation, but instead extra energy comes from muscle glycogen. This was in a fasted state might i add.

Now the fun part.

The average % of fat used to supply energy actually increased between light and moderate intensity exercise. It's unknown whether the subjects were in a fasted state or not, as they were picked about 5 minutes before the lab started.

Can anyone think of a reason why?
Heres the table too, if it helps;

If anyone can shed some light on this i'd be most appreciative

**ZECH** · 01-18-2007, 08:37 AM

Where did these numbers come from?

**Ak_88** · 01-18-2007, 08:41 AM

6 subjects tested across 3 lab sessions.

Different times of the day unfortunately, so i was thinking that some subjects may be in a fasted so insulin levels are relatively undisturbed, others may have eaten prior to the exercise, so insulin levels are likely to be much higher.

All measurements came from an online gas analysis system.

Also, they weren't all tested in Low > Moderate > High. It was all randomised.

**Spud** · 01-18-2007, 09:48 AM

Subject 2 is an anomaly or a typo.

**Ak_88** · 01-18-2007, 09:50 AM

Originally Posted by Spud

Subject 2 is an anomaly or a typo.

Anomaly.

**juggernaut** · 01-18-2007, 05:07 PM

Originally Posted by Ak_88

Working my way through a lab report and i'm in need of some help explaining something.

Basic principle of the lab session was to find out what effect exercise intensity had on substrate utilisation.

After reading through some journals, it looks to be quite concrete that increasing intensity from low to moderate does not cause any increase in fat utilisation, but instead extra energy comes from muscle glycogen. This was in a fasted state might i add.

Now the fun part.

The average % of fat used to supply energy actually increased between light and moderate intensity exercise. It's unknown whether the subjects were in a fasted state or not, as they were picked about 5 minutes before the lab started.

Can anyone think of a reason why?
Heres the table too, if it helps;

If anyone can shed some light on this i'd be most appreciative

I believe its because of the flux capictor interventing with the thingamabob.

**Spud** · 01-18-2007, 05:09 PM

Originally Posted by Ak_88

Anomaly.

In that case, I would run the test on a replacement subject and note that the original subject 2 was removed for statistical reasons. It skews the data alot.

**maniclion** · 01-18-2007, 06:20 PM

Originally Posted by Spud

In that case, I would run the test on a replacement subject and note that the original subject 2 was removed for statistical reasons. It skews the data alot.

This time don't use a cadaver either....

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