Why is it that cardio is always the hot topic of fitness discussion and seems to be the fix all solution to burning fat?
As we have all learned and I have written about in the past that cardio is not the fix all solution when it comes to body compositional changes anymore. New times have rolled in and we have tons of research studies proving that weight lifting is far more superior for fat loss and body compositional changes. But, even though we have these new findings, people still don’t get it and people still want to sit on the bikes reading magazines about Kim Kardashian’s divorce for hours and hours. Do as you please, but I know I’m one of those types of people that want to get the most bang for their buck when it comes to training. This leads me to write about what is the right type of cardio for you?
I will be doing a comparison on HIIT cardio vs LISS cardio, since these two forms of cardio are used the most. By the end of this article you will have a really good idea of what kind of cardio is right for you and how to effectively use it.
What in the world do these crazy acronyms HIIT and LISS mean?
HIIT stands for High intensity interval training, which consists of short sprint intervals coupled with low-moderate intensity work. An example of this would be a 30 second sprint followed by a 4 minute steady pace walk to cool down and bring your heart rate back to normal and then repeating it. LISS stands for Low intensity steady state cardio, which consists of purely low-moderate intensity work. An example of this would be walking on the treadmill or riding the bike and being able to hold a conversation (we tend to see a lot of this at gyms).
Now that you have a basic understanding of the two forms, let’s dive into some more detailed stuff.
LT & AD
Why testing the lactate threshold (LT) and anaerobic threshold (AT) is a good idea? The AT and LT are extremely powerful predictors of performance in aerobic exercise (cardio). There are 2 ways that muscle can burn glucose (blood sugars) and that is through aerobic work (with air) and anaerobic work (without air). For example, long bouts of LISS cardio is considered aerobic work and weight training or HIIT cardio can be classified as anaerobic work. The AT and LT are a great test for HIIT and LIIS cardio because it gives a great predictor of which type of work produces ATP (Adenosine Triphosphate). ATP is a quick burst of energy that we get in our muscles when we contract them (Ex: every time you do a bicep curl, you are getting a quick burst of ATP). HIIT produces better changes in exercise capacity as opposed to LISS cardio. High intensity training will hit the AT and LT, that’s what causes the body to make metabolic changes. When you are doing LISS, you are considered below the AT and LT.
A simple test is being able to hold a conversation while doing cardio. When doing HIIT you are above the AT and LT and when you are above the AT and LT you push for greater improvement in metabolism which thus leads to better fat loss over time.