The Tour de France is one of the most demanding events in professional sport. Covering roughly 3,500 kilometers (2,200 miles) over 21 days, riders are pushed to their limits with only two built-in rest days.
Mental and physical stress stack day after day, climb after climb, sprint after sprint. Glycogen stores are repeatedly taxed. Muscle fatigue builds. And recovery windows are tighter than the gap between final times.
In multi-day endurance events like this, performance isn't just defined by how hard you can push — it's shaped by how well you can recover and do it again the next day.
That's why elite teams, including Visma | Lease a Bike, are exploring nutritional strategies like ketones in the context of repeated, high-intensity efforts.
So what does current research suggest about ketones and recovery?
Key Takeaways
- In multi-day endurance events like the Tour de France, recovery between stages shapes performance over time.
- Research is exploring how ketones may relate to recovery processes such as oxygen delivery and cellular signaling.
- Athletes who use ketones often layer them into a structured recovery routine, rather than replacing core nutrition strategies.
- These areas are being studied in controlled settings to better understand how the body responds to repeated physical stress.
What Ketones Are and Why Elite Cyclists Use Them
To understand why ketones show up in recovery conversations, it's useful to start with how they function as a fuel source.
Ketones are energy molecules that the body produces when fat is broken down for fuel, typically during periods of low carbohydrate availability, such as fasting, prolonged exercise, or a ketogenic diet. These are known as endogenous ketones.
Ketones can also be consumed directly through supplements, often referred to as exogenous ketones. These can elevate circulating ketone levels without requiring dietary restriction.
Ketone-IQ uses R-1,3-butanediol, which is converted in the liver into beta-hydroxybutyrate (BHB), a primary ketone used by the body for energy.
Early work in this category of ketones was supported by a $6 million U.S. Department of Defense research program focused on human performance under sustained physical stress.
Ketones as Part of a Dual-Fuel Strategy
In endurance sports, ketones are often discussed within a dual-fuel framework. Rather than replacing carbohydrates, they represent an additional energy source that can be used alongside existing fuels.
During prolonged or repeated efforts, the body relies heavily on glycogen and fat metabolism. A dual-fuel approach reflects the body's ability to use both carbohydrates and fat at the same time, depending on conditions and intensity. In high-demand settings, this means the body isn't limited to a single fuel pathway — a strategy that becomes especially relevant when performance depends on recovering and going again.
How Ketones Are Being Studied for Recovery
In one controlled study involving highly trained cyclists on Team Visma | Lease a Bike, researchers examined ketone supplementation in the context of recovery after intense interval sessions. Athletes completed demanding efforts, then entered structured recovery periods under different conditions, including simulated altitude.
During recovery, researchers tracked physiological responses using tools that measured blood flow, oxygen saturation, and vascular function. The goal wasn't just to see how athletes performed in the moment, but how their bodies responded after the stress.
This research focuses on how ketones may interact with key aspects of recovery, including:
Oxygen Delivery, Blood Flow, and Recovery Processes
One area of interest in recovery research is how efficiently the body can deliver oxygen and nutrients to working muscles after intense effort. These systems influence how the body manages oxygen under repeated stress.
Erythropoietin. EPO is a hormone involved in red blood cell production. Because red blood cells carry oxygen, this pathway plays a role in how oxygen is transported throughout the body during and after exercise. In controlled research settings, ketone supplementation has been examined in relation to EPO levels in trained athletes.
Angiogenesis. This refers to the formation of new capillaries, which can expand the network of blood vessels that deliver oxygen and nutrients to muscle tissue. Some studies have explored how ketones may interact with signaling pathways associated with capillary development in response to training stress.
Vascular function. Vascular function describes how blood vessels expand and contract to regulate blood flow. This process influences how oxygen, nutrients, and metabolic byproducts are transported during recovery periods. Research has also examined how ketones may relate to markers of vascular response following intense exercise.
Ketones have been studied in relation to these pathways as part of broader endurance research. Together, they help frame how the body responds to training stress and recovers between efforts.
Recovery Signaling and Muscle Response
Beyond circulation, recovery also depends on how the body repairs and adapts to training at the cellular level.
One pathway researchers often examine is mTORC1, which regulates protein synthesis. Protein synthesis plays a role in how muscle tissue repairs and adapts following exercise.
Some studies have explored how ketones, when included in a post-exercise recovery drink, may be associated with changes in the mTORC1 signaling pathway. This line of research focuses on how the body responds after exercise, rather than during performance itself.
Adaptation is what allows athletes to handle higher training loads over time. Recovery extends beyond returning to baseline — it rebuilds the body to adapt to future demands and support ongoing performance. This is where recovery shifts from rest to adaptation.
Where Ketone Supplements Fit Into a Recovery Routine
Recovery still starts with the basics. Adequate carbohydrate intake helps restore glycogen. Protein supports muscle repair. Fluids and electrolytes help maintain balance. And sleep does more heavy lifting than most people realize.
Ketones are typically layered into this structured recovery foundation. The goal isn't to replace standard recovery nutrition, but to add another input into the system. In practice, this often means using ketones alongside carbohydrates rather than replacing them.
Some athletes also pair ketones with protein as part of a broader recovery protocol. A common approach is roughly a 1:1 ratio—for example, around 10 grams of protein alongside one serving of ketones after demanding sessions. Some also include ketones before sleep during periods of elevated training load or repeated efforts.
Whether that makes sense depends on the athlete, the context, and the overall training system. If you're interested in learning more about ketones, explore Ketone-IQ.
FAQs
Do ketones help recovery after exercise?
Ketones are being studied in relation to recovery processes such as energy availability, circulation, and cellular signaling. In controlled research settings, ketone supplementation has been associated with changes in markers linked to recovery, though results depend on context and how they are used alongside other strategies.
Why do Tour de France cyclists use ketones?
In multi-stage races like the Tour de France, recovery between stages is critical. Some professional teams incorporate ketones into broader nutrition strategies as they explore how different tools may support recovery during repeated high-intensity efforts.
Can you use ketones with carbohydrates?
Yes. Ketones are often used alongside carbohydrates as part of a dual-fuel approach. This allows the body to access multiple energy sources rather than relying on a single one.
Are ketone supplements only for keto diets?
No. Ketones can be used regardless of whether someone follows a ketogenic diet. Many athletes use them while continuing to consume carbohydrates.
Do ketones replace post-workout nutrition?
No. Recovery still depends on carbohydrates, protein, hydration, and rest. Ketones are typically used as an addition to these fundamentals, not a replacement.
Do ketones reduce fatigue?
Some studies have examined ketones in relation to fatigue during repeated efforts. In certain controlled conditions, ketone supplementation has been associated with changes in fatigue-related measures, though results vary depending on the context.
Learn More
- Study with Team Visma | Lease a Bike: Ketone-IQ Boosts Natural EPO, Blood Flow, and Recovery in Elite Cyclists
- Fueling the Future: How Ketone Supplements Are Redefining Sports Nutrition
- Beta-hydroxybutyrate or BHB – All You Need to Know
