I was born in 1963, so I was a teenage/young adult when the aerobic fitness craze was in its prime. Jane Fonda started making videos. Richard Simmons sweated to the oldies. Olivia Newton-John had us getting physical on the MTV. Back then, it was simply “aerobic exercise”. Today, we have “cardio”, “HIIT”, “Tabata”, “burst training”, “plyometric core”, “metabolic conditioning”, “Zumba”, etc. All are great forms of exercise, but, despite the growing list of labels, they are all pretty much still “aerobics”. [I would argue a case against the use or misuse of some of the labels, e.g., Tabata and metabolic conditioning (or metcon), and the term plyometric gets horribly misapplied even in strength and conditioning programming, but….]
Historically, aerobic exercise is defined as exercise that involves large amounts of muscle in a rhythmical fashion for the purpose of elevating heart rate and oxygen consumption and improving cardiorespiratory function. Aerobic essentially means “with oxygen”, as opposed to anaerobic which means “without oxygen”. Traditionally, aerobic exercise includes activities such as walking, running, swimming, cycling, stair-stepping, and, of course, aerobic dance (as it was called in the ‘80s). Today, the styles have changed (thankfully, headbands and leg warmers are gone) and the names have changed, but it is still aerobic exercise or “cardio”, as we much prefer today.
We do need to be careful with the labeling and understand what we are doing and why. Specifically (remember, we have to consider the principle of specificity—the body system makes specific adaptations to imposed demands), cardio should be intended to improve the oxidative capacity (i.e., VO2max) of the cardiorespiratory system. It should improve aerobic endurance. A secondary benefit of cardio is, of course, improve body composition via fat loss. (Don’t expect to gain muscle mass doing cardio, though it can benefit bone mass.)
Not all “cardio” is effective for improving cardiorespiratory endurance, though it may actually be better for improving body composition. It is best to consider exercise as a section of a physical activity continuum. Physical activity becomes exercise when it is done for the intended purpose of improving one’s physical health, performance, and/or body composition. Thus, some physical activity (that which we refer to as “labor”) may be physically taxing and potentially improve one’s health, performance, and/or body composition but not, technically, exercise. Exercise, then, runs a continuum from cardiorespiratory endurance to muscle endurance to muscle strength to muscle power with a range of neuromotor benefits included. Cardio may include long slow distance [LSD—or depending on intensity: low-intensity steady-state (LISS) or moderate-intensity steady-state (MISS)], interval training, moderate-intensity interval training (MIIT), and high-intensity interval training (HIIT), along with a variety of intensity modulations like tempo/pace and fartlek training. Depending on intensity and duration, all of these will improve cardiorespiratory endurance to some degree according to one’s genetic capacity. (There is evidence of low-responders to cardiorespiratory exercise, unfortunately.)
Sometimes, what is actually high-intensity interval resistance training (HIIRT) or high-intensity resistance training (HIRT) is labeled as HIIT or Tabata or some other clever name. Such exercise, however, bridges the gap between cardiorespiratory endurance exercise and strength/power exercise and should not be considered one or the other. HIIRT/HIRT are best prescribed (specifically) for body composition, as they will do less to improve VO2max and strength than promote fat loss while maintaining muscle mass. Such exercise is nonetheless important, especially if one’s goals are more specific to body composition.
I prefer a healthy balance between HIIT, HIIRT, and strength/power exercise for best overall performance. Certainly one’s goals will shift them right or left along the continuum, but for most planned variety is recommended. I emphasize “planned” because proper periodization and programming is the best route to success. Consistency and structure to training is important for progression.
The type of aerobic exercise is of less importance, as long as the cardiorespiratory system is appropriately stimulated and the principles of specificity, overload, and progression are considered. It is always best to do what you like to do and will do consistently.
Be your best today; be better tomorrow.
Carpe momento!
Image source: https://ew.com/music/2017/04/13/olivia-newton-john-physical-interview/