fasted PM cardio?

[RaginCajun]

i have been pondering this question for some time. is there a such thing as fasted PM cardio? after my 230-300pm meal, i am usually starving by 430-5. is it a good idea to do cardio on an empty stomach here, or just eat a pre-workout meal and go hit cardio 30-60 min after? thanks

[gbrice75]

I don't think it would be worth it... after only a couple hours, you're not fasted anyway. I don't think you'd be 'primed' to burn fat.

[Damienm05]

^^ Yeah agreed. Too much emphasis on fasted cardio anyway. Not to say it isn't more effective but cardio is cardio is cardio - do it when you can, get results. Period.

[SlimmerMe]

Good question....I have wondered this myself since sometimes I too am VERY hungry around 4 and wondered of cardio at that time would give me more band for the buck!

[Swifto]

Fasted or not fasted, the research doesnt indicate a great deal (if any) difference. Just make sure you do the cardio.

[jimmyinkedup]

^^ Yeah agreed. Too much emphasis on fasted cardio anyway. Not to say it isn't more effective but cardio is cardio is cardio - do it when you can, get results. Period.

Good post - Nike's slogan applies best here: Just Do It!
The more restrictions you place as far as "optimal times" etc - the more likely you are to find yourself in a position NOT to do it. More and more it appears the bodies amazing ability to adapt dictates that cardio done one time in lieu of another doesnt effect results at the end of the day. I do cardio in the am alot because it gets me going. I also do it post workout sometimes because im at the gym and its convenient and I feel better sometimes following resitance training with what would be considered low intensity cardio. That being said i def dont do it those time because i think its "better". Sometimes i ride my bike on the weekends simply because i enjoy it.

[RaginCajun]

thanks for all the answers.

[PK-V]

in terms of fat loss?

your body will turn to fat stores first

only thing is you will feel crappy

also

cardio after eating carbs will not effect fatty acid oxidation assuming your working at least at 63% of your vO2 max this may be lower in highly trained individuals

I can find the study if you want

[FireGuy]

^^Not true, fat burning is greatly hindered when insulin is present.

[FireGuy]

There are two relative states that directly affect the fat cell's willingness to release and break down fat. When the body is fasted (has not eaten for many hours), certain hormones are elevated, promoting a lipolytic (fat breakdown) response to the fat-losing hormones and neurotransmitters, the most important being norepinephrine— an adrenalin-like chemical released from nerve endings.18 When the body is fasted, the concentration of glucocorticoids is elevated, which upregulates (similar to stimulating or promoting) the production of desnutrin/ATGL.19 In the fed state, insulin concentrations are high, which activates the enzyme that turns off the fat-loss signal generated by the adrenaline-like biochemicals and drugs.18 There are a number of other hormones and signaling molecules that affect the fat cell's preference to store or break down stored fat.

18. Jaworski K, Sarkadi-Nagy E, et al. Regulation of triglyceride metabolism. IV. Hormonal regulation of lipolysis in adipose tissue. Am J Physiol Gastrointest Liver Physiol, 2007 Jul;293(1):G1-4.

19. Villena JA, Roy S, et al. Desnutrin, an adipocyte gene encoding a novel patatin domain-containing protein, is induced by fasting and glucocorticoids: ectopic expression of desnutrin increases triglyceride hydrolysis. J Biol Chem, 2004 Nov 5;279(45):47066-75.

[PK-V]

Totally agree that insulin hinders fat burning but that's not the case when your training at an intensity greater than 63% of your vo2 max
in other words don't do liss cardio after carbs

I wasn't to far off typing that reply from memory 63% exactly
damn im good!

"At the established intensity level of peak fat oxidation (~63% VO2 max), carbohydrate increases performance without any suppression of fat oxidation in trained subjects."

References
Melanson EL, et al. Resistance and aerobic exercise have similar effects on 24-h nutrient oxidation.. Med Sci Sports Exerc. 2002 Nov;34(11):1793-800.
Ahlborg, G., and P. Felig. Influence of glucose ingestion on fuel-hormone response during prolonged exercise. J. Appl. Physiol. 1976;41:683-688.
De Glisezinski I, et al. Effect of carbohydrate ingestion on adipose tissue lipolysis during long-lasting exercise in trained men. J Appl Physiol. 1998 May;84(5):1627-32.
Coyle EF, et al. Fatty acid oxidation is directly regulated by carbohydrate metabolism during exercise. Am J Physiol. 1997 Aug;273(2 Pt 1):E268-75.
Civitarese AE, et al. Glucose ingestion during exercise blunts exercise-induced gene expression of skeletal muscle fat oxidative genes. Am J Physiol Endocrinol Metab. 2005 Dec;289(6):E1023-9.
Wallis GA, et al. Metabolic response to carbohydrate ingestion during exercise in males and females. Am J Physiol Endocrinol Metab. 2006 Apr;290(4):E708-15.
Coyle, et al. Muscle glycogen utilization during prolonged strenuous exercise when fed carbohydrate. J. Appl. Physiol. 1986;6:165-172.
Coyle, et al.. Carbohydrates during prolonged strenuous exercise can delay fatigue. J. Appl. Physiol. 59: 429-433, 1983.
Horowitz JF, et al. Substrate metabolism when subjects are fed carbohydrate during exercise. Am J Physiol. 1999 May;276(5 Pt 1):E828-35.
Febbraio MA, et al. Effects of carbohydrate ingestion before and during exercise on glucose kinetics and exercise performance. J Appl Physiol. 2000 Dec;89(6):2220-6.

http://www.thebodygenesis.com/myths-...fasted-cardio/