What Can a 91-Year-Old World-Record Sprinter Teach Us About Aging?
6 min read
Most conversations about exercise and aging focus on what we eventually lose.
Muscle mass declines. Strength decreases. Power falls. Aerobic capacity deteriorates. Fast-twitch muscle fibers become smaller, and movements that once felt explosive gradually become slower.
None of that is controversial. Aging changes human physiology.
But a more useful question may be this:
How much of that decline is unavoidable, and how much can be influenced by the way we continue to train?
A remarkable 2026 study published in the Journal of Applied Physiology gives us an unusual look at that question. Researchers performed extensive physiological testing on a 91-year-old woman who holds multiple world records in sprinting, including a 50.33-second outdoor 200-meter performance in the 90-plus age category.
They measured her aerobic fitness, cardiac function, skeletal-muscle oxidative capacity, mitochondrial function, muscle-fiber composition, and capillarization. They even obtained a muscle biopsy from her vastus lateralis.
The results do not prove that sprinting stops aging. This was a case study of one extraordinary athlete, and genetics, training history, and other individual factors undoubtedly matter.
But her physiology provides a striking example of how much physical capacity can remain even in the tenth decade of life.
Aerobic Fitness Decades Younger Than Her Age
During testing, the athlete reached a VOâ‚‚peak of approximately 23 mL/kg/min.
The researchers reported that this was comparable to approximately the 50th percentile for women in their 50s. Her skeletal-muscle oxidative capacity was also similar to values reported in healthy adults decades younger.
This was not simply a 91-year-old who happened to be fast compared with other 91-year-olds. Multiple parts of the physiological system responsible for delivering and using oxygen had been preserved to an unusual degree.
Aerobic capacity normally declines substantially with age. Regular training cannot eliminate biological aging, but research on master athletes consistently shows that physical activity can strongly influence where someone sits on that declining curve.
Aging may lower the ceiling, but inactivity can lower it much faster.
We have discussed why maintaining aerobic capacity matters beyond athletic performance in Why VOâ‚‚max Matters for Adults: The Longevity Metric Most People Ignore.
What makes this case especially interesting is that she was not primarily an endurance athlete.
She was a sprinter.
Sprinting Trains More Than Speed
Sprinting is usually associated with power and anaerobic energy production. That is accurate, but incomplete.
Short, maximal efforts rely heavily on phosphocreatine and glycolysis. As sprint duration increases, however, oxidative metabolism becomes increasingly important as well.
The authors describe sprint performance as involving two interconnected sides of the same system. One is neuromuscular: rapid motor-unit recruitment, fast muscle fibers, and the ability to produce large amounts of force quickly. The other is metabolic: the ability to regenerate ATP, deliver and use oxygen, and manage the fatigue created by intense exercise.
A 200-meter sprint lasting roughly 50 seconds requires contributions from all three major energy systems.
That helps explain why the athlete displayed such an interesting combination of characteristics. She had preserved oxidative capacity, but she also retained a substantial proportion of muscle fibers associated with faster, more powerful movement.
The Fast-Twitch Muscle Fiber Finding Is Particularly Interesting
One of the characteristic changes in aging muscle is preferential atrophy of type II muscle fibers.
These fibers play an important role in rapid force production, acceleration, jumping, sprinting, and other explosive movements.
In the 91-year-old sprinter, researchers found that 57% of her fibers were fast MyHC II fibers. About 50% were type IIa, with smaller proportions of IIa-IIx and IIx fibers.
That is an unusually high proportion of fast fibers for someone of her age.
Her type II fibers were still smaller than her type I fibers, so sprint training had clearly not made her immune to age-related changes. Even lifelong master athletes experience physiological decline.
But that is different from saying the decline is fixed regardless of behavior.
Her muscle still displayed a combination of fast-fiber representation, preserved oxidative capacity, and vascular characteristics that the researchers believe contributed to her exceptional performance.
The lesson is not that sprinting prevents the loss of fast-twitch muscle.
It is that continuing to train qualities such as force, speed, and power may help preserve more of those capacities than simply allowing them to go unused.
Strength and Power Are Not the Same Thing
Strength describes how much force you can produce. Power also incorporates how quickly you can produce it.
That distinction becomes increasingly important as we age.
Many everyday movements depend on rapid force production: recovering balance after a misstep, climbing stairs, rising quickly from a chair, or reacting when you begin to fall.
Resistance training remains foundational because it helps preserve muscle, strength, bone loading, and general function. But traditional lifting does not necessarily expose the body to the same movement velocities as sprinting, jumping, throwing, or other explosive activities.
Sprinting is one way to train that quality. It is not the only way.
Hill accelerations, cycling sprints, jumps, loaded explosive movements, and other high-velocity exercises can all be used depending on the individual's training history and physical capabilities.
Sprints Also Provide a Powerful Cardiovascular Stimulus
The cardiovascular findings in this athlete also fit with broader research showing that sprint interval training can improve cardiorespiratory fitness.
That does not make sprinting a replacement for walking, Zone 2 cardio, traditional endurance work, or strength training.
Those methods create different adaptations.
A well-rounded training program can use multiple forms of exercise to develop different physical qualities instead of expecting one method to do everything.
Sprinting provides exposure to very high movement velocities, rapid force production, and intense cardiovascular demand. Those are qualities that steady-state cardio and traditional resistance training do not reproduce in exactly the same way.
Should Everyone Start Sprinting?
No.
A 91-year-old world-record sprinter with decades of experience is very different from someone who has not run quickly in twenty years deciding to perform an all-out sprint tomorrow.
Sprinting produces high forces and loading rates. The hamstrings, calves, Achilles tendon, hips, and other tissues need time to tolerate those demands.
That means sprint work should be progressed just like resistance training.
Someone may begin with submaximal accelerations rather than true maximal sprints. Others may initially be better suited to a bike, sled, incline, or another modality that allows high-intensity effort with less eccentric loading.
The appropriate option depends on training history, bodyweight, conditioning, orthopedic limitations, technique, and current fitness.
This follows the same principle we discussed in The Best Exercise Depends on What You're Trying to Build: the best exercise is not simply the movement capable of creating the greatest theoretical stimulus. It has to fit the person performing it.
The Bigger Lesson Is About Physical Reserve
The most important lesson from this 91-year-old athlete is larger than sprinting.
Her physiology illustrates something researchers studying master athletes have recognized for years: aging and inactivity often occur together, but they are not the same thing.
Some decline occurs even in people who train throughout life. But training can dramatically change the level from which that decline begins.
Think about two people entering older age.
One has substantial muscle, strength, power, aerobic fitness, and movement capacity. The other begins with much less of each.
Both may decline with age, but they have very different amounts of physical reserve available to lose.
That is one of the strongest arguments for training beyond appearance.
The goal is not simply to avoid becoming weaker with age. It is to build and preserve enough physical capacity that age has more capacity to take away.
Why Sprint Work Has a Place in Arcos
The Arcos Program is built primarily around structured resistance training because muscle and strength are central to long-term physical development.
But physical capability involves more than muscle size alone. That is why portions of the Arcos system will also include appropriately programmed sprint work.
The purpose is not to turn everyone into a competitive sprinter. It is to maintain exposure to a physical quality many adults gradually stop training: the ability to produce force quickly and perform genuinely high-intensity movement.
As with any training variable, sprint work should be introduced progressively, matched to the individual, and placed within the larger training week so that the stimulus does not create unnecessary fatigue or interfere with recovery.
That systems-based approach is central to The Foundation. Strength, hypertrophy, cardiovascular fitness, recovery, and performance are not unrelated goals. They are different parts of developing a more capable body.
A 91-year-old world-record sprinter represents an extreme example of what physical capacity can look like late in life.
Most of us will never set a world record.
But the broader lesson still applies:
Getting older does not necessarily mean we should stop training athletic qualities. In many ways, preserving them becomes more valuable with age.
References
Colosio M, Pilotto AM, Ansaldo M, et al. One half of the sprinting coin: the oxygen transport cascade of a 91-yr-old female world-record sprinter. Journal of Applied Physiology. 2026;140:1649-1657. doi:10.1152/japplphysiol.00279.2026.
Korhonen MT, Cristea A, Alén M, et al. Aging, muscle fiber type, and contractile function in sprint-trained athletes. Journal of Applied Physiology. 2006;101(3):906-917. doi:10.1152/japplphysiol.00299.2006.
McKendry J, Breen L, Shad BJ, Greig CA. Muscle morphology and performance in master athletes: A systematic review and meta-analyses. Ageing Research Reviews. 2018;45:62-82. doi:10.1016/j.arr.2018.04.007.
About the Author
AFT Fitness Coaching develops structured, evidence-based training systems for adults who want to build muscle, improve body composition, and train with greater confidence. The Arcos Program combines proven training principles with long-term progression, giving members a clear plan instead of another random workout.