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Originally Posted by graaja This is going to be a long post, but I will try to answer your questions from my own experience. |
Thanks for the effort!
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Once you get over the first few days of your body resisting the fasted state, you will actually feel more energetic and active in fasted state at work. After all, our body has been programmed to use fat as its primary fuel source. This is from my own experience.
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Was guessing as much. And gastric juice secretion (and activation of the hunger centers) adjusting to change in dietary rhythms is well known to medical science and has been my experience as well.
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Regarding muscle loss, from what I have read and watched, unless you are into long periods of fasting like 36 hours and more, body does not burn protein. In one of the videos on IF, Dr. Jason Fung says our body has evolved over a million years to store fat and then use this fat during starvation. Unless it runs out of stored fat, it does not burn muscles. This makes total sense, and I don't think we have the risk of muscle loss in a 16:8 fasting cycle.
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Thanks. This is what I was worried about. But really, at 95 kilos and in danger of climbing if left unchecked, right now dramatic weight loss trumps fears of some muscle loss, even if it weren't so.
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More than post workout fasting, it is about how long a workout you can do in fasted state and in what intensity you can do the workout. When you are doing low intensity workout in your endurance zone, your body will use fat as fuel and will be able to sustain.
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All my weekly rides and even weekend rides up till 100-150 kms are fasted rides. Of course I eat along the way over 80-100 km. Its only the 200 and above BRMs where I eat before the ride.
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But you need to first train your body to do this. When I had started doing fasted runs or cycling, I used to hit a wall at about 30 minutes. After this, there will be absolutely no energy to continue. However, after about 10 minutes of perseverance, I used to feel a sudden surge in energy and after this I could continue. This sudden surge in energy is when the body switches over from glycogen as primary fuel to fat as fuel. I have been able to do 12km runs at moderate pace in a fasted state. The key here is moderate intensity.
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I don't run. On my rides, as I said above, at my peak I could maintain a 25+ kmph average over a 100 km (Pune to Khopoli on NH4 or Pune-Yavat/Kedagaon-Pune on Sholapur highway) in a fasted state, non-stop. I can do the same at a slightly slower 24 kmph over 40-60 km currently. But as you can imagine, on a 14+ kilo hybrid, this is not a "moderate" or "fat burning" pace at all. You are driving proper. Very little easing off. Especially in Pune's rolling to hilly terrain.
I tried doing the easy riding thing mid last year when I came back from my ITB injury and did not want to hurt myself and take it slow on the ramp up. So middle chain-ring and lots of spinning. My speed dropped to 22 and even 21. That did not work for me. I am happy right now at 24-25 and 40 km and will wait for the legs and heart/lungs to push the distance up slowly. Without backing off the pace. And eventually pace as well (my highest was close to 29-30 for close to 70 km during my 200 and 400 BRMs on the flat Sholapur highway and close to 26-27 kmph for the first 150 km, but ya, then that blows you out for the middle leg .... stupid pacing).
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When I was training for my half ironman triathlon in the past 4 months, I had to do high intensity workouts (like interval training and extended periods of workout at higher intensities) to improve performance, I could not sustain the fasted workouts. So, in the past four months, I had gone back to my regular carb based nutrition, and believe me I gained 2 kilos of weight inspite of 10 to 12 hours of training a week. Now I have started fasted workouts again. And I am struggling to strike a balance between teaching my body to burn fat as fuel and at the same time improve my performance.
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This is again great info. And really you are at the phase of training I have only skimmed ... i.e. power and speed. The base miles already in place (3000+ uninterrupted kms at the very least from what I hear).
For you, I would suggest this.
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Cut your rides from 1:40 hours to 1:00 hour. Do these rides at moderate intensity. Do not worry about average speeds at this time. Just focus on moderate intensity and teach your body to burn fat as fuel. In the first few rides you will feel that wall at some point in the ride. Continue riding at even lower intensity till you start feeling that energy surge. Once your body starts getting used to this, gradually increase the distance and time.
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I don't mind doing as you say at all. But as I have tried to explain above, I am already doing fasted rides, and already doing them up to 1:45 to even 2:00 (yes, the last leg is still not unstressed though, but I've done barely 800 km/20 rides in the past 2 months since my break) at 24 kmph. So should I ease off? And ramp up slower?
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Next is the fasting window. Start with a smaller fasting window.
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This is a problem once you leave home and are at work. There is no food available in between - till lunch time.
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And remember one thing. Intermittent fasting is not about cutting your intake, but managing it in a shorter window. Within the 8 hour eating window, have wholesome filling meals.
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So Im guessing a lunch at 12:30 and then dinner latest by 8:30, with a snack thrown in somewhere in between?
Can I at least have black coffee (brewed filter coffee) during the fasting period between the ride and lunch?
For the past month or so, I have cut out lunch. I have a mug of strong milk coffee (no sugar) with two eggs and either porridge or two slices of toast for breakfast, then come home ravenous and grab some bites, then a late dinner (usually 9:30-10 pm). That's my regular dinner time. Maybe that's how the fasted rides are not such an issue? Im trying to keep off bread, rotis, rice, potatoes. I'm not much into pasta etc. and I never have sugar with my tea or coffee (for years).
Cheers, Doc