one would expect an ambassador of Trainingpeaks would have read this article.
Some relevant nuggets:
CPV = CCL2*Pi/60
Where CPV = circumferential pedal velocity (in m/s), C = cadence (in rev/min), CL = crank length (in m), and again the constants 2, Pi, and 60 serve to convert the data to the proper units. While technically muscle shortening velocity or at least joint angular velocity should be used instead of CPV, CPV has been shown to be an excellent predictor of joint angular velocity and, by extension, muscle shortening velocity. Indeed, since crank length is generally constant, especially for a given individual, one could just as well use cadence instead of CPV. However, the latter has been used here to be consistent with scientific convention and to emphasize the relationship of such cycling-specific plots to the more general force-velocity curve of muscle.
Once again, threshold power (and the associated cadence) provides a useful basis for comparison, and in particular for separating relatively low force from relatively high force pedaling effort. (It cannot be overemphasized that the absolute forces generated while cycling are usually quite low, such that strength is rarely a limiting factor to performance. An example of how quadrant analysis can be used to demonstrate this point is provided at the end of this article.) In particular, one factor contributing to the curvilinear relationship between exercise intensity and various metabolic responses (e.g., glycogen utilization, blood lactate concentration) is the recruitment of type II, or fast twitch, muscle fibers. Specifically, when pedaling at a typical cadence and a power output well below lactate threshold, there is little engagement or utilization of fast twitch fibers, but with progressive increases in power output, a progressively greater fraction of the total motor unit pool will be recruited to generate the required force. Based on scientific studies using a wide variety of techniques (e.g., EMG spectral analysis, muscle biopsies), it appears that threshold power represents not only a threshold in terms of the power that an athlete can sustain, but also somewhat of a threshold in terms of fast-twitch fiber recruitment. To state it another way: when pedaling at a typical self-selected cadence, functional threshold power appears to occur at the power (and thus force) at which significant fast twitch fiber recruitment first begins. Thus, AEPF and CPV at an individual’s threshold power can be used to divide the force-velocity scatterplot from any of their rides into four quadrants, as shown in Fig. 3. This division is somewhat arbitrary, in part because of the gradation in force and thus motor unit recruitment that occurs when cycling. Also, exercise duration plays an important role in fiber type recruitment, but this is not considered in the figure (to do so would require a three-dimensional plot of AEPF vs. CPV vs. time, which is too complex for routine use). Nevertheless, data points that fall into these four quadrants can be interpreted as follows:
Quadrant I (upper right): high force and high velocity. At the extreme, this would represented by sprinting, but most any extended supra-threshold effort on level ground (e.g., attack or bridge attempt during a race) would entail “quadrant I pedaling”. Perhaps not surprisingly, mass start racing on the track (e.g., points race) invariably entails a significant amount of such high force, high velocity pedaling, due to the typical aggressive nature of such racing and the use of a fixed gear.
Quadrant II (upper left): high force but low velocity. Typically, “quadrant II pedaling” occurs when climbing or accelerating, especially from a low speed. Indeed, a standing start, in which the initial CPV is zero, is the one situation in cycling where strength is truly limiting, i.e., only when CPV is zero will AEFP be maximal. Racing off-road (i.e., cyclocross or mountain bike racing) also often involves a significant amount of such high force, low velocity pedaling. However, even a race held on pavement may require a large percentage of such pedaling, if the climbs are steep and/or the rider is overgeared.
Because AEPF is sufficiently high, pedaling in both quadrant I and quadrant II would be expected to entail significant recruitment of fast twitch fibers.
in case that was tl:dr for you, this means that fast twitch muscle recruitment can be engaged at all sorts of cadences.
as for how this is relevant for the OP, it means you ride at the cadence specific to the event in which you’ll be participating. You foresee yourself needing to grind up a 1.5 mile long hill at 70rpm, then do 70rpm repeats, by all means.