Our expert says:
there's no right or wrong answer. the answer is that he should train whenever he can, according to his schedule.
The key is the food intake and so if I said you had to eat at least one hour before you trained, then suddenly training at 5am means eating at 4am and that's not ideal! But you can't stock up on carbs the night before unless you carbo load, but that is not somehing you would do for a training session. So instead, my advice is that you have a very small bite to eat about 15 minutes before, but then you must eat or drink DURING the run. You can't do 3 hours without eating or drinking something, and that's where drinks like Powerade (500 ml per hour would give you enough energy) come in handy.
One final comment, I'm not sure how you know you are going at 70% VO2max, other than to actually measure it, so don't get too stuck on the numbers - you can't measure that accurately enough for it to make a difference to your training.
The information provided does not constitute a diagnosis of your condition. You should consult a medical practitioner or other appropriate health care professional for a physical exmanication, diagnosis and formal
advice. Health24 and the expert accept no responsibility or liability for any damage or personal harm you may suffer resulting from making use of this content.