6'4" 230. Down from 300, but up from 190. Need to get back on the wagon.
Originally Posted by
rachel120
Frankly, that's scary, putting caffeine in you and then either cycling in traffic or driving to the gym. You know what exercise without food leads to? Disorientation. Because your blood sugar is too low to support your brain's requirements. I've hit a glucose level of 55 many times, so I know full well what it does to your brain, and it's not safe to be on the road.
Nope. That fat might be good for safe calorie restriction diets, but skipping food and exercising is going to lead to a blood sugar drop, and that is stupid dangerous.
I was the same way when I had hypoglycemic tendencies. Had to constantly snack as a teen/young adult. On the other hand, some cross country buddies would skip breakfast(why carry the extra weight?) and take caffeine pills right before races. We aren't talking slow people, either. All of us were sub 17 for 5k, and a few flirted with 14:xx on fast courses. Definitely an individual problem. I don't worry about my blood sugar since my metabolism slowed down and I'm not running an unhealthily low body fat anymore.
Originally Posted by
Maelochs
People tell me it takes about 45 minutes of aerobic exercise to kick your body into high fat-burning gear for about six hours, and at least 15 or 20 to do any good at all. Also, some folks find that they cannot risde 45 minutes a day hard right away .... which means that a lto of the time they are breaking down their bodies, not building them up.
Nothing wrong with using up your glycogen. Takes a long time and effort until you start breaking down muscle for fuel. No idea about the science, but when I was seriously running the belief was that 18-22 miles was useful for training, but anything longer than that was detrimental.
Originally Posted by
hubcyclist
I use a power meter, so I get my work in kJ, which roughly translates into calories. So for that ride I expended 270 calories, not really a lot when you think about it, so you'd have to go on around 10 rides like that to burn a pound.
Human body isn't anywhere close to 100% efficient. Multiply the work you did by a factor of 3.5-4.5 to get calories burned.