There’s no denying that caffeine plays an important role in the daily grind of many people. Most will start their day by reaching for a steaming cup of joe… and will usually follow up by consuming two or three more cups throughout their day. I, personally start my day with an energy drink. I enjoy the fact that energy drinks are cold and can be consumed easier than hot coffee, first thing in the morning. And the B Vitamins sure add some kick to my day.
But as with all things in life, there’s good and bad to every situation. And the consumption of caffeine is obviously included among that concept. Recently, I’ve noticed that getting through a cardio workout after consuming an energy drink or coffee is difficult. I’ll often feel sluggish, start sweating long before hitting my peak and will be exhausted, even when I’m only at my halfway point. Are they just bad days? Maybe if it was only one of these on very rare occasions, but I’ve come to notice that I’ll usually have an energy drink on the go prior to the sluggish workouts in question. Is there a correlation?

I decided to look into if it was possible that a beverage meant to stimulate me and make me feel more awake and alert could be causing me to feel sluggish and affect my workouts. I found a bunch of different information, although the bare bones information didn’t make for a definite answer. This is why I won’t be citing any sources, since I couldn’t find anything certain. But here are some things I know about caffeine that could have something to do with it.
- Caffeine Can Dehydrate You: It’s no secret that consuming large amounts of caffeine will cause dehydration. If you experience even mild dehydration, it can cause bodily pain, headaches, sluggishness and profuse sweating. Imagine all that WHILE trying to run, cycle or perform some level of cardio?
- Caffeine Is A Diuretic: Your workout will be cut pretty short if you have to take a piss every five minutes. Increased levels of caffeine will cause you to urinate frequently. And if it isn’t bad enough that blood sugar fluctuations will cause that to begin with, downing coffee or an energy drink before your workout may have the same effect.
- Coffee And Caffeinated Beverages Can Cause A Wide Variety Of Symptoms: Stomach pains, headaches and upset stomachs are only some of the symptoms you might experience while working out, if you’ve consumed significant caffeine beforehand.
- It Can Have An Effect On Your Heart Rate: Some people will feel an effect on their heart rate when they consume caffeine. This is one of the reasons why you’ll be told not to consume caffeine before a stress test or a fitness test. Imagine, for a moment that your heart rate can be measured on a scale of one to ten, where one is at rest and ten is where you die because your heart give out. Let’s assume that an average run gets you to a seven or an eight, depending on your age and overall health. This would be normal, right? Your heart rate will increase the more your exert yourself. But if consuming an energy drink or caffeine already gets you to a seven or an eight, then you add cardio on top of an already elevated heart rate, I’m sure you can do the math and see where the problem comes in.
As with all things, caffeine is best enjoyed in moderation. The key point for me, will be trying to resist the urge to gulp some caffeine before a run because I’m already feeling like shit. The lesson here is that all you have to do is get yourself going. Once you’re in the groove, you may find you perform just as well as you would with caffeine on board. Don’t get me wrong, I still love my caffeine. I may simply have to re-examine its use during my fitness routine. now if you’ll excuse me, it’s early and I need a coffee… ☯️












