Caffeine is one of the most popular performance-enhancing substances, both in everyday life and within the world of sports. Many athletes, especially those who take part in endurance sports such as running, cycling and triathlon, use caffeine to improve their performance. But what exactly is caffeine, and how does it affect the body during training and competition? In this blog post, we will provide an in-depth review of what caffeine does to the body, and how you can use it to optimize your performance.
What is caffeine?
Caffeine is a natural stimulant found in more than 60 different plants. Some of the best-known sources are coffee beans, tea leaves and cocoa beans, but caffeine is also found in many other plants. In nature, caffeine functions as a defense mechanism that protects plants against insects. For us humans, caffeine is best known for its ability to stimulate the central nervous system and make us more awake and focused.
When you consume caffeine, it quickly begins to work, and it can take as little as 15-30 minutes to feel the effect. Caffeine blocks adenosine, a neurotransmitter in the brain that makes us feel tired. When the adenosine receptors are blocked, we feel more alert and energetic. This makes caffeine particularly effective in training contexts, where energy and mental sharpness are crucial for performance.
How does caffeine affect the body?
Caffeine has a wide range of effects on the body, both mentally and physically. Here we take a closer look at some of the most notable ways in which caffeine can benefit your training and competition:
- Increased focus and alertness
As mentioned, caffeine blocks the adenosine receptors, creating a feeling of increased energy and reducing fatigue. This mental stimulation is one of the main reasons why many athletes use caffeine, as it improves attention and helps maintain focus during long and demanding training sessions.
- Improved physical performance
One of the major benefits of caffeine is its ability to improve both endurance and explosive power. Caffeine stimulates the release of adrenaline, the body’s “fight or flight” hormone, which increases heart rate and mobilizes fat stores so the body can use fat as energy. This is particularly useful during prolonged endurance training, as it helps spare the body’s glycogen stores, which would otherwise be used up quickly. The result is that you can train for longer before becoming exhausted. (Source: PMID: 36615805)
- Reduction in perceived exertion
Caffeine can also help make your training feel less strenuous. Research shows that caffeine lowers perceived exertion during physical activity, which means you feel that you can perform more without feeling overwhelmed by fatigue. This is especially useful in endurance sports, where the mental battle against exhaustion is often a major challenge.
- Better fat burning
Caffeine also has a documented effect on fat burning. It increases the levels of epinephrine (adrenaline) in the blood, which signals the body to break down fat and use it as energy. This makes caffeine particularly effective during long training sessions, where the body needs a constant supply of energy. (Source: PMID: 30335479)
- Side effects
Although caffeine has many benefits, it is important to use it wisely. Too much caffeine can lead to nervousness, palpitations and, in some cases, sleep problems. It is therefore important to find the right balance, so you benefit from caffeine’s performance-enhancing properties without experiencing the negative side effects.
How much caffeine should you consume?
When it comes to caffeine, it is important to find the right dose that suits your needs and your tolerance. For most athletes, it is recommended to consume 3 mg of caffeine per kg of body weight to achieve a performance-enhancing effect. For a 70 kg person, this would correspond to 210 mg of caffeine, which is roughly equivalent to 2 cups of coffee. If you are competing over many hours, you can consume caffeine more evenly throughout the period, but it is not recommended to exceed 6-9 mg per kg of body weight over the course of the day. Please note that it is said that 300-400 mg of caffeine daily can be part of a healthy and balanced diet, but that 600 mg and above would be described as a "high caffeine intake". (Source: Sundhed.dk and TeamDanmark)
However, it is important to remember that the effect of caffeine varies from person to person. Some people are more sensitive to caffeine than others, and it can take time to find the right dose that works best for you. It is also a good idea to test the effect of caffeine during training before using it in competition. This allows you to see how your body reacts, and how you can best use caffeine to your advantage.
Natural vs. artificial sources of caffeine
Caffeine is found in many different forms, and athletes have a wealth of options to choose from when it comes to getting their caffeine intake. Here is a comparison between some of the most common sources:
- Coffee and tea
Natural sources such as coffee and tea often contain more substances than just caffeine, which can affect how the body absorbs and uses the caffeine. Coffee, for example, has a relatively slow and sustained release of energy compared to caffeinated sports products. This makes coffee a good choice before training, but perhaps not the best choice in the middle of a competition, where a quick energy supply is necessary.
- Caffeinated energy products
Energy gels, energy drinks and pre-workout products are designed to deliver caffeine quickly and effectively, making them ideal for use during competition. These products also contain other ingredients such as carbohydrates and electrolytes, which can help maintain energy levels and improve performance during long training sessions or competitions.
You can read more about pre-workout in our more in-depth article "Learn more about pre-workout".
Caffeine in PurePower products
At PurePower, we offer a range of caffeinated products designed to give you the energy you need when it matters. Our Energy Gels are easy to consume during training or competition and contain both caffeine and fast-absorbing carbohydrates, giving you an instant energy boost. We also have caffeinated pre-workout products that are perfect for getting you going before a hard workout. In addition, you will also find caffeine in several of our Hydro tabs filled with electrolytes.
Our products are created with a focus on optimizing your performance and giving you the right amount of caffeine, so you can get the most out of your training without risking side effects. Whether you are heading to a major competition or just want to perform your best during training, PurePower’s products can help you keep your energy level up and perform at your highest.
