High Performance Physiology

In this episode, Chris and Rob explain [1] what adaptations isometrics are best suited to stimulating, and [2] how to include isometrics in a standard strength training program for stimulating those adaptations. They also talk briefly about some common misunderstandings and misapplications of isometrics in the fitness industry.

In this episode, Chris and Rob analyze the strength training program used in the study: "Exploring the Upper Limits of Resistance Training Volume for Muscle Hypertrophy and Strength in Trained Athletes" by Räntilä and Ahtiainen, which was published in 2026. The reason for the review is that the subjects were national-level track and field athletes, so the training program reflects what many S&C coaches are currently programming for this population. The paper is currently open access and table 1 shows the training program that we talk about.

Finally, Chris and Rob tackle block periodization, explaining why it makes very little sense for athletes in any strength or power sport. This episode references material covered in previous conversations, especially the preceding two (31 dose-response of adaptations and 32 supercompensation) as well as frequent discussions about the rate of loss of adaptations during detraining and fatigue accumulation.

As a preparatory topic before covering block periodization, Chris and Rob explain the concept of supercompensation. Supercompensation is the observation that outcome measures (like strength, speed, power) can reduce during a high-volume training block and then rebound (supercompensate) during a subsequent deload or taper. But that does not happen because of a delayed adaptation. It happens because fatigue was accumulating during the high-volume training block and reducing the value of the outcome measure.

The dose-response of hypertrophy to workout volume is a famous phenomenon. In this episode, Chris and Rob talk about how all adaptations display dose-responses (even though they have not been as carefully studied). That affects how we program for speed, maximum strength, stretch-shortening cycle, and maximum eccentric strength.