Machine Calf Press vs Machine Calf Extension
Swapping Machine Calf Press (Machine) for Machine Calf Extension (Machine) retains 100% overlap; expect externally braced cam track. Compare exact 17-muscle fractional recruitment before swapping equipment mid-session.
Side-by-Side 17-Muscle Recruitment Delta
How primary mover (1.0× set) and synergist (0.5× set) allocation changes when swapping Machine Calf Press for Machine Calf Extension.
| Muscle Group | Machine Calf Press | Machine Calf Extension | Leverage Shift |
|---|---|---|---|
| Calves (Gastrocnemius & Soleus) | Primary (100%) | Primary (100%) | Matched |
Load & Volume Conversion: Machine Calf Press → Machine Calf Extension
Worked weight heuristic: a 115 kg set on Machine Calf Press (Machine) maps roughly to 115 kg on Machine Calf Extension (Machine; 5 kg jumps, curve: cam-matched resistance across sticking points). Calibrate set 1 at RPE 8 so e1RM history for Machine Calf Press remains unskewed. Zero anatomical muscles are dropped between Machine Calf Press and Machine Calf Extension; 1:1 weekly set volume carries straight across.
Supporting Sports-Science Literature
| Study Title | Lead Author & Year | Verified Link |
|---|---|---|
| Greater Gastrocnemius Muscle Hypertrophy After Partial Range of Motion Training Performed at Long Muscle Lengths. | Kassiano (2023) | PubMed 37015016 ↗ |
| Different Foot Positioning During Calf Training to Induce Portion-Specific Gastrocnemius Muscle Hypertrophy. | Nunes (2020) | PubMed 32735428 ↗ |
| Progressive overload without progressing load? The effects of load or repetition progression on muscular adaptations. | Plotkin (2022) | PubMed 36199287 ↗ |
| Assessment of muscle volume and physiological cross-sectional area of the human triceps surae muscle in vivo. | Albracht (2008) | PubMed 18555257 ↗ |