PulsoGym logs every set: load, reps, time under tension, what was prescribed and what actually happened. The obvious purpose of that record is to look back — to compare today with last week. But the literature on performance feedback during resistance training points to something else, less obvious: the act of showing the number to the person training changes what that person does in the moment, before any historical comparison happens. The program stays the same. The effort does not.
Two kinds of information, two different effects
A review by Lauber and Keller, published in the European Journal of Sport Science in 2012, organises the literature on augmented feedback — any information about performance that comes from outside the body, not from the sensation of the movement itself — into two functions that do not always move together. One is motivational: seeing a number, good or bad, changes how hard a person pushes. The other is informational: the number teaches how to correct execution. The review gathers studies linking visual force feedback to gains in power and torque output, but it also flags a real limit: many of those studies are small and lack a robust control group, which calls for caution before treating the effect as guaranteed in every context.
Even wrong feedback increases maximal effort
The most direct experiment on this split comes from Bugnon, Wälchli and Taube (2023), also in the European Journal of Sport Science, with 32 people. Each one performed two tasks: a maximal isometric contraction of the quadriceps — a simple effort, with no technique to get right — and a maximal explosive contraction, a more complex task where how the force is produced matters. In each task, participants received visual feedback on their own performance — sometimes correct, sometimes deliberately wrong, showing a number higher or lower than the real one. In the simple task, both correct and incorrect feedback increased the force produced compared to training with no feedback at all: the data itself did not even need to be true — showing any number already changed the effort. In the complex task the effect split apart — only correct feedback helped, and incorrect feedback hurt performance. When execution demands getting the technique right, information starts to outweigh motivation on its own.
The same pattern shows up with real load, over weeks
Feedback in a lab, in a single session, is one thing. What matters for someone training is whether it holds up in an actual resistance training programme. A systematic review with meta-analysis by Weakley and colleagues, published in Sports Medicine in 2023, gathered the literature on performance feedback — barbell velocity, power, strength — during resistance training sets. The acute finding: giving feedback increased barbell velocity by roughly 8.4% within the same set, compared to training without that feedback; visual feedback worked better than verbal, and the more frequent it was — after every repetition, rather than only at the end of the set — the larger the gain. Tracking training over weeks, the few available studies showed vertical jump and short sprint speed improving more in people who trained receiving that constant feedback than in people who trained without it. It is the same logic as the isometric contraction experiment, just replicated in people who already train, with real load, session after session.
Where this meets the app
PulsoGym does not decide the program for anyone, and logging a set does not, by itself, change how many reps it had. What changes is what the person sees after hitting the number: the prescribed load next to the load actually lifted, the previous session next to the current one, without having to remember it by heart. That is exactly the kind of feedback the studies above associate with more effort and, over weeks, more gain — not because the app prescribed something different, but because showing the number is itself, already, part of the stimulus.