The term "time under tension" or TUT has been flying around the bodybuilding community for years. It's usually associated with the term "slow and controlled" when referring to rep speed.
But simply slowing your reps way down to increase TUT probably isn't the best way to do it. Adding more reps is.
Time under tension deals with set duration, not just rep duration. Slowing reps down or adding more reps can both increase the TUT of a set, but which is better? Let's take a look at a study that examined identical time under tension with different rep schemes and durations.
Twenty-two males with at least 6 months of training experience and the ability to bench at least bodyweight were recruited. After establishing 1RM, the subjects performed two protocols on separate days:
Total time under tension per set for each trial was 36 seconds.
EMG of the anterior deltoid, pec major, and triceps were recorded. Lactate values were assessed prior to exercise, 1 minute after each set, and every 3 minutes for 12 minutes following the final set.
The increased muscle activity during the shorter rep duration, along with the higher lactate values, show a clear winner in the time under tension battle. With TUT equal (36 seconds), doing more reps seems to be the winner via increased activation and greater lactate levels, indicating greater metabolic stress.
So instead of slowing down your reps in a workout to increase time under tension, simply add a few more reps with a faster rep speed.
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