Due to the high intensity of this training, consider using appropriate supplementation to boost your results and stimulate better recovery. (fitnessandpower.com)
The ones who increased the volume and intensity of their training while reducing the duration of their sleep showed a 100 per cent rise in risk of injury. (sciencedaily.com)
The frequency and intensity of your training leads me to believe that you are running with rather depleted muscle glycogen stores on a regular basis. (drrosedale.tenderapp.com)