Hypertrophy: Triceps — Long Head Stretch and Training Science
The tricep long head is only fully stretched when the arm is overhead (shoulder flexed). Overhead extensions produce greater long head CSA than pushdowns alone. The long head comprises ~55% of total tricep mass — overhead extension programming is the bottleneck for tricep size (Kholinne et al., 2018 — PMID 29892590).
| Measure | Value | Unit | Notes |
|---|---|---|---|
| Tricep long head: proportion of total tricep mass | ~55 | % of total tricep cross-section | Kholinne 2018: long head is the largest tricep head; dominates the back-of-arm appearance |
| Long head stretch requirement | shoulder flexion >90° | arm overhead position | Long head crosses the shoulder joint — it is only maximally lengthened when the arm is elevated overhead |
| Overhead extension vs. pushdown: long head activation | higher | in overhead position | Overhead extension places long head at 2-joint stretch (elbow flexed + shoulder flexed); pushdown does not |
| Lateral head emphasis | elbows tucked, straight bar | technique variable | Lateral head: best activated with narrow grip and elbows tucked close to body during pushdowns |
| Volume requirement: tricep development | 10–18 | sets/week direct + indirect | Pressing exercises contribute 6–12 sets/week indirect tricep stimulus; 4–8 sets/week direct may be sufficient |
| Cable overhead extension: stretch position advantage | constant tension at stretch | vs. dumbbell overhead | Cable overhead extension (cable from below) maintains tension at the overhead stretch; dumbbell loses tension at top |
The triceps brachii is a three-headed muscle that extends the elbow and, for the long head, also contributes to shoulder extension. At approximately 60% of upper arm cross-sectional area, the triceps is actually larger than the biceps — making tricep development the primary lever for arm size, not bicep development as commonly assumed.
The three heads: long head (~55% of tricep mass, origin at infraglenoid tubercle of scapula — crosses the shoulder joint); lateral head (~30%, origin at posterolateral humerus above the radial groove); medial head (~15%, origin at posteromedial humerus below the radial groove). All three insert on the olecranon process of the ulna via the common tricep tendon.
Tricep Exercise Comparison
| Exercise | Long Head | Lateral Head | Medial Head | Stretch | Load Potential | Overhead? |
|---|---|---|---|---|---|---|
| Cable pushdown (rope) | Low | High | High | None | Moderate | No |
| Cable pushdown (straight bar) | Low | High | High | None | High | No |
| Overhead cable extension | High | Moderate | Moderate | Maximum | Moderate | Yes |
| EZ-bar skull crusher | High | Moderate | Moderate | Good | High | Yes (lying) |
| Dumbbell overhead extension | High | Moderate | Moderate | Good | Moderate | Yes |
| Dip (close grip) | Moderate | High | High | Moderate | High | No |
| Close-grip bench press | Moderate | High | High | Moderate | Very high | No |
| Kickback | Moderate | Moderate | Moderate | Limited | Low | No |
| Reverse-grip pushdown | Low | Low | High | None | Moderate | No |
The Overhead Difference
The long head’s origin at the scapula means it crosses both the elbow and shoulder. Only when the arm is overhead (shoulder flexed >90°) and the elbow is flexed is the long head simultaneously stretched at both joints. This two-joint stretch produces the passive tension and mTOR signaling characteristic of stretch-mediated hypertrophy. Pushdowns, dips, and close-grip presses — regardless of load — do not achieve this position.
Landin et al. (2017, PMID 28270880) reviewed long head function and confirmed that overhead positioning is required for maximal long head activation. Programming that excludes overhead extensions systematically undertrains 55% of the tricep mass.
Volume Distribution Between Compound and Direct Work
The bench press and overhead press provide substantial tricep stimulus as primary contributors to elbow extension against load. Most bench-focused programs already stimulate the lateral and medial tricep heads adequately via pressing. The gap is almost always the long head — because pressing doesn’t reach the overhead stretched position. Even with heavy bench volume, adding 3–4 sets of overhead extensions per session directly addresses this gap and produces meaningful additional long head hypertrophy.
Related Pages
Sources
- Kholinne, E. et al. (2018). The effect of each head of the triceps brachii muscle on elbow extension torque of the elbow joint. Acta Orthopaedica et Traumatologica Turcica, 52(3), 201–205.
- Landin, D. et al. (2017). Functions of the triceps brachii in humans: a review. Journal of Clinical Medicine Research, 9(4), 290–293.
- Kassiano, W. et al. (2023). Greater gastrocnemius muscle hypertrophy after partial range of motion training performed at long muscle lengths. Journal of Strength and Conditioning Research, 37(9), 1729–1736.
- Schoenfeld, B.J. (2021). Science and Development of Muscle Hypertrophy (2nd ed.). Human Kinetics.
Frequently Asked Questions
Why is the tricep long head important for arm size?
The tricep long head comprises approximately 55% of total tricep mass (Kholinne et al., 2018, PMID 29892590). It is the dominant contributor to arm thickness when viewed from behind and to the horseshoe shape visible from the side. Neglecting long head-specific training by only doing pushdowns (which do not stretch the long head) leaves the largest tricep head understimulated. Overhead extensions specifically target the long head's stretched position.
Should you do overhead extensions or pushdowns?
Both, with overhead extensions prioritized for long head development. Pushdowns effectively target the lateral and medial heads but do not place the long head in a stretched position. Overhead extensions (cable, dumbbell, EZ-bar) stretch all three heads simultaneously, with the long head receiving the greatest stretch-position stimulus. A complete tricep program includes at least one overhead extension movement per session alongside one pushdown variation.
What is the best overhead extension exercise for tricep hypertrophy?
Cable rope overhead extension (cable from low pulley, facing away) provides the best combination of constant tension and long head stretch. Dumbbell overhead extensions (single or double arm) are effective but lose tension at the top of the movement. EZ-bar overhead (lying or standing) allows heavier loading. Skull crushers (lying tricep extension to forehead) combine overhead extension with heavy loading and are a staple in advanced tricep programming. The most important factor is the overhead arm position, not the specific implement.
How much direct tricep work do you need if you bench press regularly?
Bench press and overhead press contribute significant indirect tricep stimulus — approximately 6–12 sets/week equivalent depending on volume. For most trainees targeting arm development, 4–8 additional direct tricep sets/week (2–4 sets × 2 sessions) is sufficient to produce hypertrophy beyond compound pressing contribution. Advanced trainees with arm specialization goals may need 10–15 direct sets/week. The key is including at least one overhead extension in the direct tricep work to address the long head.