First and foremost, your intake of caffeine should depend very much on who you are and your present medical condition. People with heart disease, high blood pressure, high anxiety, or insomnia should definitely use caution and check with your doctor before using caffeine. It is certainly not recommended for people who are pregnant either.
Otherwise, while moderation is often encouraged, caffeine is probably the most effective exercise supplement available. It affects several different types of cells throughout your body including muscle cells, fat cells and those within your central nervous system. Besides increased athletic performance and decreased fatigue, caffeine can also improve your mental focus as well. It even may help you burn more calories.
How does it do all of this? Many different ways. Caffeine increases circulating epinephrine, the hormone that kicks in during the fight or flight response and gives us that adrenaline rush feeling. Beta-endorphins are also produced that help give you the workout high feeling as well. The effects on the central nervous system are not as well understood but we all tend to feel more awake, focused and able to process things quicker mentally when we consume it. Caffeine can increase your body's ability to burn fat via lipolysis- breaking down fat in fat cells- plus it can raise your body temperature too, which can help burn calories. The lipolysis effect means that you might burn less of your glycogen carb storage, leading to enhanced endurance performance.
There have been plenty of studies of caffeine and endurance athletes, with all of them experience some performance improvements. How much you improve once again depends a lot on you and your genetic make-up but you don't have to read the studies to know this. Just consume a reasonable amount of caffeine and you will very likely feel more energy.
For higher-intensity training, the results are pretty similar except a little more skewed towards caffeine being more of a benefit to trained athletes vs. untrained athletes. For strength training, there is not a lot of evidence to show that it will increase your 1 rep maximum lift but your overall performance and muscular endurance (reps, rest time between sets) will likely improve.
All of these things will benefit your boxing training. You can box at a given intensity for longer before feeling fatigued. I can tell you almost every fighter consumes caffeine before training or a fight. Usually a pre-workout or sometimes just black coffee. They have to be careful not to overdo it, especially before a fight, as some of the side effects, like jitteriness, are not beneficial. Usually, it is anywhere between 40-325 mg. Depends on a lot on their personal tolerance and body weight.
Speaking of side effects, is there a down side? Of course! Too much caffeine can cause:
- increased heart rate
- anxiety
- dizziness
- irritability
- tremors
- multiple stomach problems
- sleep disruptions
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