When diving into the science of working efficiency, the idea of VO2max is sort of unavoidable.
Outlined merely, VO2max is the utmost charge that your physique can extract oxygen from the air.
Once you run, that oxygen will get absorbed in your lungs into your bloodstream, will get pumped by the guts, and travels to your muscle mass, the place it’s put to make use of burning fats or carbs.
Everybody agrees about that half.
The controversy begins once you begin to ask the plain subsequent questions:
- How does VO2max contribute to efficiency
- And what a part of the oxygen supply system—bloodstream, coronary heart, or muscle mass—issues most in relation to figuring out your VO2max?
So, that’s what we’re going to look at in as we speak’s article by digging into the analysis.
VO2max measures metabolic energy, not working velocity
When runners speak about efficiency, we imply one thing very particular: velocity!
If you happen to get an invite to look at a “high-performance 5k,” you’d justifiably expect to see some quick occasions.
However VO2max doesn’t measure velocity—it simply estimates your physique’s metabolic energy output.
Extra particularly, it’s an estimate of your highest cardio energy: once you’re working quick sufficient to hit VO2max, nearly the entire oxygen you’re consuming is getting used to burn carbs for power.
With the ability to generate numerous cardio power is nice, nevertheless it doesn’t assure that you just’ll be capable of run quick.
To go from cardio energy output to working quick requires changing that metabolic energy into ahead movement—that’s the place working financial system is available in.
Very like a automotive with a strong engine however flat tires, a excessive VO2max just isn’t very helpful if it’s paired with poor working financial system.
For longer occasions, just like the 10k and half marathon, there’s a further issue at play: your highest sustainable degree of oxygen consumption.
Usually, if you happen to attempt to run at, say 90% or 95% of your VO2max, your oxygen consumption received’t be secure—it’ll rapidly climb to 100% of your VO2max, and also you’ll quickly change into too drained to proceed.
At a decrease worth, say 70 or 80% of your VO2max, you’ll be capable of keep a secure charge of oxygen consumption over time, and also you’ll final for much longer earlier than getting fatigued.
That worth—the very best proportion of VO2max you may keep at a steady-state—is your steady-state max.
Similar to runners can have completely different VO2max values, they will even have completely different values for this steady-state max—even when they’ve the identical VO2max!
To run quick, you want all three components:
- The flexibility to provide a variety of cardio power (VO2max)
- Accomplish that in a sustainable approach (steady-state max)
- And effectively convert that power into ahead movement (working financial system).
VO2max and efficiency in runners
Since VO2max is just one of three main components influencing working efficiency, it shouldn’t be shocking that VO2max by itself just isn’t a very good differentiator of working capacity amongst runners who’re already fairly match.
One research on almost 200 top-level Spanish runners discovered that VO2max by itself couldn’t establish the perfect elite distance runners in comparison with their merely fairly good counterparts.
Moreover, Nike’s Breaking2 Venture, which did complete physiology testing on a number of the greatest marathoners on the planet, discovered excessive, however not amazingly excessive VO2max values amongst these elite marathoners.
Lots of them clocked in at 65–70 mL/kg/min, despite the fact that elite 5k runners can usually hit 80 mL/kg/min or greater.
In bigger and extra various samples, although, there’s no denying that there’s a hyperlink between VO2max and efficiency.
A 2021 research of navy recruits in Norway whose 3k race tempo ranged from almost 12:00/mi to six:00/mi discovered that VO2max alone defined two-thirds of the variation in efficiency throughout the recruits.
Clearly, a excessive VO2max is the worth of admission for high-level performances—however doesn’t assure quick occasions by itself.
Central or peripheral? Blood and coronary heart versus muscle mass
The opposite massive controversy with VO2max is what organic components decide its worth.
In precept, any hyperlink within the oxygen supply chain (blood, coronary heart, or muscle mass) could possibly be the bottleneck.
One other mind-set about this query is whether or not you’re restricted by oxygen absorption by your blood, or oxygen utilization by your muscle mass.
Most physiologists agree that the largest think about figuring out VO2max is solely what number of crimson blood cells you have got.
Extra crimson blood cells means extra hemoglobin, and extra hemoglobin means you may carry extra oxygen in your blood.
As identified in a 2016 commentary article by physiologists Carsten Lundby, David Montero, and Michael Joyner, whole hemoglobin alone explains almost half of the variation in VO2max throughout athletes.
If you happen to incorporate cardiac output—the utmost quantity of blood your coronary heart can pump per minute—that fraction leaps to over 90%.
Issues solely get heated when contemplating whether or not blood quantity and cardiac output are the solely components that matter.
Some physiologists consider the above proof is convincing, whereas others argue {that a} sofa potato with an elite athlete’s coronary heart and bloodstream wouldn’t have the required oxygen-extraction capabilities of their muscle mass to make full use of the additional oxygen.
VO2max in apply: rising blood quantity and cardiac output
Whatever the controversy, one factor is obvious: in case your VO2max is limiting your efficiency, boosting your blood quantity and rising your cardiac output are probably the most promising methods.
As for how you can go about boosting these two components, the analysis is much less controversial: each blood quantity and cardiac output could be improved with interval exercises that hit at the least 90% VO2max.
In apply, which means coming inside about 8–10% of your most coronary heart charge (or hitting >90% of coronary heart charge reserve, if you would like a extra exact metric).
For particular exercises, see the part under on completely different exercises you need to use for varied race distances.
For optimum cardiac output advantages, these intervals needs to be supported by excessive total coaching quantity: padding out your weekly coaching with loads of straightforward to reasonable runs, to the extent that your coaching schedule permits.
Particular VO2 max Exercises you may Implement
Now on to everybody’s favourite: the coaching particulars!
VO2 max for the 5k
Out of the commonest race distances, VO2 max is most essential within the 5k.
Whereas the primary portion of 5k coaching will concentrate on constructing cardio endurance, consider this section as constructing the muse of a home.
The final 1/third of a 5k coaching plan, nonetheless, will emphasize VO2 max exercises – consider this because the roof.
A number of glorious examples of 5k particular VO2 max exercises are:
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12 x 400 meters at 1 mile to 3k race tempo w/1:30-2:00 minutes relaxation
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12 x 300 meters at 5k tempo w/ 30-40 seconds relaxation
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5 x 3 minutes hill repeats with jog down restoration
In search of extra info and exercises for coaching for a 5k?
Try our 5k Particular Coaching submit. Or, how about our Base Coaching for 5k and 10k submit?
VO2 max for the 10k and half marathon
The particular calls for of the 10k and half marathon aren’t closely reliant on VO2 max, however it’s nonetheless an essential part to spherical out health.
Within the 10k and half marathon, you must have a VO2 max exercise scheduled each 2-3 weeks to maintain the system in test and help different power methods (cardio improvement and threshold coaching).
My favourite exercises to mix into 10k coaching are:
- 16 x 400 meters at 5k – 10k tempo with each 4th 400 at 1 mile-3k tempo w/ 60 seconds between reps
- 4 miles steady tempo alternating 400m at 3k-5k tempo and 1200 meters at Marathon tempo
- 4 x 2 minutes Hills w/ jog down restoration, 1 mile on a flat floor at 10k tempo, 4 x 2 minute Hills w/ jog down restoration
We have now an important article on Particular Coaching for the 10k right here, and a 6 week 10k particular coaching plan for making use of the variation precept.
VO2 max for the Marathon
Sadly (or thankfully, relying on how a lot you want lung-busting interval exercises), VO2max just isn’t a giant part of marathon coaching.
Nonetheless, It’s nonetheless helpful and essential to incorporate some VO2 max exercises and velocity work in your coaching plan each 3-4 weeks to assist your kind and effectivity.
My marathon go-to’s are as follows:
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2 units of 10 x 400 meters at 5k tempo w/ 200 meters jog relaxation and 400 meters jog between every set
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20 x 200 meters at Mile to 3km tempo w/ 200 meters jog restoration
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6 x 3 minutes at 3k to 5k tempo w/ 3 minutes stroll or jog between
Recap
VO2max measures the very best charge at which your physique can extract oxygen from the air—and since oxygen is used to burn gasoline for power, it’s primarily a measure of your cardio energy output.
Not surprisingly, VO2max is a big contributor to working efficiency—however not the solely contributor.
To run quick, you want a excessive VO2max, the power to maintain a excessive proportion of your VO2max at a steady-state, and the power to effectively convert metabolic energy into ahead movement.
VO2max relies upon closely in your coronary heart and bloodstream: a lot of the variations in VO2max throughout completely different runners are attributable to the full quantity of hemoglobin in your blood, and the utmost charge your coronary heart can pump blood.
So-called “peripheral” components, like how effectively your muscle mass can extract and use oxygen, solely contribute a bit of to VO2max, if in any respect.
These peripheral components do matter for efficiency, however most likely by way of their affect on whether or not you may maintain a metabolic steady-state at a given charge of oxygen consumption.
Understanding the origins of VO2max—and its limitations as a measure of efficiency—might help focus your coaching.
If VO2max is holding you again, the easiest way to enhance it’s by specializing in exercises that concentrate on blood quantity and cardiac output: interval exercises with repeats that convey you inside about 8–10% of your most coronary heart charge.
