∆% @VT1 (%) – Percentage Change at Ventilatory Threshold 1

The category “∆% @VT1 (%)” stands for the percentage change at the first ventilatory threshold. It’s like a game where you have to start breathing heavily at a certain point – that point is VT1. This category tells us how much earlier or later you reach this point during exercise, in terms of percentage. So, if this number is higher, it means you’re hitting that heavy-breathing point quicker than before, like needing to breathe hard earlier in your run.