I just got an app called Couch to 5K, which helps you prepare to run a 5K even if you're totally out of shape. It's a 9 week program.
It relies heavily on intervals -- walking and running. It increases the run times and decreases the walk times as the program progresses.
Has that been proven to be the best for improving your endurance and speed? Or is it just a way to make running accessible when you're out of shape?
The reason I ask is because i DO have the ability to jog steadily for 5K. But only at a very slow pace. I'm wondering if I should continue to do that and focus on improving my speed each run or if the interval (via the app) is actually more effective.
if you get the chance, check out some of Joel Jamieson's writing. he largely writes about MMA conditioning, but I've found his writing to be pretty enlightening, as far as steady-state vs HIIT:
"First, there are specific adaptations to the heart itself that are different between lower and higher intensity methods. Lower intensity methods done for longer periods of time, such as LSD type training, produces an enlargement of the left ventricle of the heart. This makes it possible for the heart to pump out more blood with each beat and thus it doesn’t have to work as hard to deliver blood and oxygen to the working muscles. This adaptation is known as eccentric cardiac hypertrophy.
Higher intensity methods, on the other hand, work to strengthen the muscle fibers of the heart and cause its walls to thicken as a result. This adaptation is referred to as concentric cardiac hypertrophy and it too helps the heart pump more blood and oxygen with each beat, but in a different way than the eccentric hypertrophy. Each of these adaptations works to improve your aerobic fitness, and both are important, but it’s important to understand that they differ in their effects on conditioning.
The lower intensity methods cause your heart to have to work less hard to deliver the same amount of blood and are thus well suited towards aerobic endurance. This also means your heart rate will stay lower as you exercise at a wide range of intensities and thus you can maintain them for longer. Higher intensity methods, by contrast, are better suited to helping your heart continue to pump more blood and oxygen at higher heart rates and thus enable you to maintain very high rates for longer before you become ultimately become fatigued and gas out."
http://www.8weeksout.com/2010/11/06/putting-an-end-to-the-lsd-vs-hiit-debate/