The overhead triceps extension loads the triceps brachii 2.2× more than the shoulder press machine.
MyoHeat simulates the whole rep with muscle attachments and strengths from published research models, and shares the load between muscles the way the body is thought to: the least total effort that still moves the weight. The bars are each muscle's peak load in the rep, as a % of its maximal force.
Overhead Triceps Extension · 20 kg
Triceps brachii77%
Forearm extensors67%
Trapezius46%
Latissimus dorsi39%
Pectoralis major35%
Rotator cuff25%
See it move
Shoulder Press Machine · 25 kg
Deltoid50%
Forearm extensors40%
Triceps brachii35%
Trapezius34%
Rotator cuff27%
Brachialis23%
See it move
How sure is this?
Both exercises pass the model's literature checks: their prime movers in published EMG studies are among the muscles it loads most. The comparison is at each exercise's default load; change the weight in the app and the numbers move. It is an educational estimate, not training or medical advice. Sources, and where the model is wrong.
More triceps brachii comparisons
- Overhead Triceps Extension vs Push-up: about equal (77% vs 68%)
- Overhead Triceps Extension vs Chest Press Machine: Overhead Triceps Extension, 1.3× (77% vs 60%)
- Push-up vs Chest Press Machine: about equal (68% vs 60%)
- Push-up vs Shoulder Press Machine: Push-up, 1.9× (68% vs 35%)
- Chest Press Machine vs Shoulder Press Machine: Chest Press Machine, 1.7× (60% vs 35%)
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