The tension-time integral has some interesting implications. We can't just rely completely on weight, even
though it's the primary signal and absolutely necessary for growth to happen. There has to be some amount of
muscular work done too. The tension-time integral is not simply about work, but rather work with a given
amount of tension. Indeed, there's research showing that both tension and the tension-time integral are
important in triggering the muscle-growth chemistry (Martineau and Gardiner 2001, 2002). Once you've got a
heavy enough weight, the amount of work will tend to modulate the actual hypertrophy response (Wernbom
et al. 2007).
