These observations are consistent with the published literature which suggests keto - adaptation yields excellent endurance but yields limited ability to tap into
aerobic threshold intensity levels when compared to glycolytic pathways.
Not exact matches
Having good
aerobic fitness is about burning fuel efficiently at moderate levels of
intensity, and still being able to put down reasonable power but not incurring an oxygen debt that pushes you above your
aerobic threshold.
Doing so also seems to gradually raise your anaerobic
threshold, sparing glycogen and allowing higher degrees of
intensity to be performed in an
aerobic state.
So, any downturn in your
aerobic speed (at a heart rate below your
aerobic threshold) is a direct indicator that your
aerobic base is either fatigued or in decline, meaning that your body is at the moment that much less capable of absorbing the stresses of high -
intensity training.
Since High
Intensity Interval Training produces equivalent improvements in vo2max, anaerobic
threshold,
aerobic power, and other long - distance biomarkers without ever actually going the distance.
If you elevate the
intensity beyond the
aerobic threshold, the body will change its hormonal mixture to include many more stress hormones.
That said, let's say that it turns out that the 180 - Formula does predict your
aerobic threshold relatively closely, and that you've been doing the bulk of your training at anaerobic
intensities.
Let me give you a brief summary: the
aerobic threshold is the highest level of
intensity at which the body can train without triggering a stressed state.
The third system being the
Aerobic Oxidative System which consists primarily of exercises that are performed at an
intensity lower than that of the anaerobic
threshold (3).