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**Attaniuri** · 12-10-2005, 07:00 AM

I defintely don't have the endurance I had pre-Atkins. But there is a caveat to this statement. I was running distances (training for Chicago Marathon) but after my 15 mile run in Mid July I pretty much stopped running. This was due to heat not Atkins as I wasn't doing Atkins at that time. I really haven't gotten back to running yet and the few times I've tried it was miserable. I do walk briskly (12 min/miles) for over 3 miles every day.

I'm pretty confused about what fuels a workout. Common science says that your body will burn the most available fuel sources first. That would be glycogen which is derived from carbs and stored in your muscles. The key is that your muscles can only store so much. Once the stores are depleted, your body turns to either muscle or fat if you dont ingest more readily available carbs. Endurance athletes will start taking in high carb supplements such as gu within 30 minutes of starting their workout and usually continue to do so every 45 minutes or so for the duration. But keep in mind that a lot of endurance athletes don't have much in the way of body fat and they don't want to use muscle tissue. So how does this information apply to people who have ample stores of fat to fuel their workouts? And why do so many of us feel we don't have the same endurance. If our body switches to burning fat as fuel, shouldn't we see little differance? And yet I hear this time and again.

I have continued to cycle throughout the summer. On Mondays the group I train with usually does about 2 hrs of riding. I typically bonk at about the 90 minute mark. I don't know if this is because my carb intake is lower or I've lost strength and endurance from not running and weight training like I used to or a combination of both. I'm beginning to think that on days when I'll be out there for more than an hour, I'll start using gu's and sports drinks. I'll more than burn it off during the workout so it shouldn't bump me out of ketosis.

I don't know. I see info on both sides of this argument and each is adamant that they are right.

12-10-2005, 07:00 AM	#6
Attaniuri Join Date Oct 2005 Posts 555 Senior Member	I defintely don't have the endurance I had pre-Atkins. But there is a caveat to this statement. I was running distances (training for Chicago Marathon) but after my 15 mile run in Mid July I pretty much stopped running. This was due to heat not Atkins as I wasn't doing Atkins at that time. I really haven't gotten back to running yet and the few times I've tried it was miserable. I do walk briskly (12 min/miles) for over 3 miles every day. I'm pretty confused about what fuels a workout. Common science says that your body will burn the most available fuel sources first. That would be glycogen which is derived from carbs and stored in your muscles. The key is that your muscles can only store so much. Once the stores are depleted, your body turns to either muscle or fat if you dont ingest more readily available carbs. Endurance athletes will start taking in high carb supplements such as gu within 30 minutes of starting their workout and usually continue to do so every 45 minutes or so for the duration. But keep in mind that a lot of endurance athletes don't have much in the way of body fat and they don't want to use muscle tissue. So how does this information apply to people who have ample stores of fat to fuel their workouts? And why do so many of us feel we don't have the same endurance. If our body switches to burning fat as fuel, shouldn't we see little differance? And yet I hear this time and again. I have continued to cycle throughout the summer. On Mondays the group I train with usually does about 2 hrs of riding. I typically bonk at about the 90 minute mark. I don't know if this is because my carb intake is lower or I've lost strength and endurance from not running and weight training like I used to or a combination of both. I'm beginning to think that on days when I'll be out there for more than an hour, I'll start using gu's and sports drinks. I'll more than burn it off during the workout so it shouldn't bump me out of ketosis. I don't know. I see info on both sides of this argument and each is adamant that they are right.
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