Since I am soon 50, it makes me focus on how to improve fast and how to reduce the effects of aging on running and health in general. The more I read the more it points to the title of the thread. If we do not use the power and speed, we loose it.
There are several indications. Master sprinters decline less than middle and long distance runners when comparing race times. And this is a paradox since aging naturally reduces the fast twitch muscle parts much much more than the slow twitch.
Aging does not affect cadence much, but the stride length decreases substantially. So the POWER is lost, not the contraction speeds of muscles.
Anaerobic capacities decline more than aerobic, but this is maybe natural if we loose more fast twitch than slow twitch muscle fibres?
The statistics on the master runners is quite clear and is a proof that the training master sprinters do is better at maintaining the speed and power than long distance training. The problem with this for master long distance runners is how does some of this training translate to endurance?
Maintaining the neural connection and control of muscle fibres is actually one problem with aging and I believe max speed and power is important to prevent the aging effects. So max 10s hill sprints are maybe a must for aging master runners, probably also combined with strength training/plyos. I am unsure if heavy strength training or medium heavy is best. Heavy gives max employemnt of muscle fibres, but medium strength with more reps and little rest can re-build muscle mass which can again make up or prevent aging effects.
The anaerobic capacity is important and should not be lost. I find indications that loosing this ability is a key reason for loosing power in the stride giving shorter stride lengths also when running at long distances. I start to believe that focusing on anaerobic work is key to maintain running fast at longer distance for master runners. I believe somewhere between 30s-2.5 min rep duration at a relatively max effort is needed. 30s all out with long rest is max anaerobic power, whereas 30-2.5min with relatively short rest (15s to 1-2min a 2:1 or shorter) is effective as sustained and high anaerobic power relevant for the racing. I think we do not have enough research on this.
For myself I have been lazy between 45-50 yo and need to rescue my power and anaerobic ability. It is improving, I have a great aerobic base for my level, but hit a wall close to my threshold pace. It is hard to run faster for 10-15-20min compared to 30-40. It should not be like that and I will experiement with the anaerobic capacity and the VO2 max related paces to see if I can do something about it