06/14/2022
This is a review of the an article by Steven Hirsch, .sci , "Understanding the Force-Time Curve’s Role in Breaking PRs."
Admittedly, I was very excited about this article. This was a review of how to read these curves and then how different training methods effect the shape (and outcome) of lifts.
Things to note:
- Shape changes based on movement types. Those stretch-shortening cycles (eccentric to concentric like squat and bench) and those with just shortening (deadlift).
- Discussing how MUCH impulse is needed/applied, not HOW force is applied.
- Focus is on the first two regions of the curve.
The area under the curve is known as impulse which is generally expressed as: I=FΔt, or Δp = FΔt. This tells us that we can optimize these curves by altering the force and time parameters. The goal in optimizing these parameters is to maximize the area of the acceleration phase and/or minimize the area of the stick region.
Steven reviews how to do this with 4 modalities.
1.) Max Effort Method = Increase Force Generation during Accel. Phase.
2.) Dynamic Effort Method = Increase rate of force production (which is not equivalent to having an increase in peak force).
3.) Accommodating resistance or pneumatics = Extending/lengthening the Accel. Phase. He discusses the differences in implementation with chains, bands, pneumatics.
4.) Isometrics = Decreasing the sticking region by getting stronger there (again not equivalent to increasing peak force).
An overall very informative article and phenomenal graphics (shown). These showcase that there are several ways to still get stronger and make progress!!!