TUT - Time Under Tension
TUT (Time Under Tension) measures the total time the muscle is under load during a set. Key variable for hypertrophy.
TUT - Time under stimulus
Definition
TUT (Time Under Tension) is the total time, in seconds, that a muscle stays under mechanical load during a set. Calculated as: number of reps × duration of each rep.
💡 TUT is a key variable for hypertrophy. It depends on tempo, not just on rep count.
How to calculate TUT
Example with a 10-rep set, tempo 3-1-1-0:
- Each rep takes 3 + 1 + 1 + 0 = 5 sec
- 10 reps × 5 sec = 50 sec of TUT
Same set with no tempo (1-0-1-0 explosive):
- Each rep takes 2 sec
- 10 reps × 2 sec = 20 sec of TUT
Optimal TUT by goal
| Goal | TUT per set | Why |
|---|---|---|
| Maximum strength | 5-15 sec | Few reps, fast execution |
| Strength-power | 10-20 sec | Heavy + explosive |
| Hypertrophy | 30-70 sec | Optimal anabolic stimulus |
| Strength-endurance | 60-120 sec | Sustained metabolic stimulus |
| Aerobic endurance | 120+ sec | Mitochondrial adaptation |
Why TUT matters for hypertrophy
- ✅ Maximizes mechanical tension: longer time under load
- ✅ Increases metabolic stress: lactate, hypoxia
- ✅ Promotes pump: bigger, more durable
- ✅ Stimulates growth: 30-70 sec per set is the "hypertrophy sweet spot"
- ✅ Improves mind-muscle connection: feeling the muscle better
How to optimize your TUT
- ✅ Slow down the eccentric: 3-4 sec minimum
- ✅ Add pauses: 1-2 sec at the bottom or top
- ✅ Control concentric: 1-2 sec, not explosive (except for power)
- ✅ Avoid lockout: stay in tension at top of movement
- ✅ Choose hypertrophy reps: 8-15 reps with controlled tempo = ideal TUT
⚠️ TUT is a tool, not the only goal. A 60-sec set at light weight isn't equal to a 60-sec set at heavy weight. Mechanical tension matters more than just time.
Common mistakes
- ❌ Doing fast reps and thinking volume is enough
- ❌ Using too light loads to maximize TUT (insufficient mechanical tension)
- ❌ Confusing TUT with rest time
- ❌ Always doing the same TUT on every exercise
Key takeaways
TUT is a key variable for hypertrophy, often ignored. Aim for 30-70 sec per set with a controlled tempo. It's not about going slow on light weight, it's about controlling heavy weight. Tempo + load + reps = optimal TUT.
Termes associés
Training volume represents the total amount of work performed. 12-20 sets per muscle per week for steady progression.
Tempo in training refers to the execution speed of a movement. 4-number notation: eccentric, pause, concentric, pause.
RPE (Rate of Perceived Exertion) is a 1-10 subjective scale to measure the intensity of your effort during training.
Muscle hypertrophy is the increase in muscle fiber size. The mass-gain process resulting from resistance training.
