www.independent.co.uk/news/science/jo-pavey-gold-medal-the-science-of-her-longdistance-success-9667228.html
Professor Steve Haake, director of the Centre for Sports Engineering Research at Sheffield Hallam University.
“Younger athletes have the advantage in terms of strength and speed over short distances, which is why so many runners switch to longer distances as they get older where it’s more about endurance,” Professor Haake said.
One unavoidable fact about any high-energy sport is that it gets more difficult the older you get. It mostly comes down to the inevitable decline in the maximum amount of oxygen the body can take in – something called VO2max.
Studies have shown that this decline usually begins after the age of 35 and although training can slow down the rate of deterioration, it cannot stop it completely.
Research on elite older runners who undergo heavy training has found that they still have a VO2max that is about 10 per cent lower than comparable athletes of a younger age.
Ageing causes several changes in the body that affect athletic performance. The heart for instance undergoes structural and functional alterations which cause it to be less efficient at pumping blood around the lungs and muscles.
Getting oxygen to the muscles of the body of a long-distance runner is crucial because in the absence of oxygen, levels of lactic acid build up as the cells switch from aerobic to anaerobic respiration – the process of breaking down glucose to release energy.
Older athletes are often better at managing the build-up of the lactate ion in muscles, which causes pain and eventually cramps. One study of older elite runners in their 50s, for instance, found that their muscles worked closer to their maximum VO2 levels for the duration of a race compared to younger runners – which helped to limit the build-up of lactate.