|In general, you have to count and limit your weekly HIIT sessions. Doing as much as humanly possible, could yet make sense, when you're preparing for Olympia 2016 and realize 5 weeks before the event that you have been lingering for too long ;-)|
"More HIIT doesn't help more, either"
I guess the above would be the elevator pitch for the mythical "turbo lift" in Star Trek. For someone like yourself who has learned never to swallow "expert" wisdom just like that, the statement "more HIIT doesn't hep more, either" obviously won't be satisfying.
|Figure 2: Illustration of the training in the low frequency (LF) and high frequency (HF) group.|
... adapatation takes time and training more often does not accelerate this process!
In the end, I am actually quite surprised to see that the net VO2 "gain" the scientists measured in the subsequent detraining phase (see Figure 2) was identical. Or, more explicitly, that packing 24 training sessions into three weeks did not blunt the mitochondrial adaptation processes that are responsible for the increase in VO2max, altogether.
|Figure 2: VO2max and heart rate values of the 16 healthy subjects before / after high vs. low frequency HIIT (Hatle. 2014)|
- Hatle H, Støbakk PK, Mølmen HE, Brønstad E, Tjønna AE, et al. "Effect of 24 Sessions of High-Intensity Aerobic Interval Training Carried out at Either High or Moderate Frequency, a Randomized Trial." PLoS ONE 9(2). (2014): e88375. doi:10.1371/journal.pone.0088375