Machine Crunch vs Cable Crunch
FR : Machine Crunch ↔ Cable Crunch
Swapping Machine Crunch (Machine) for Cable Crunch (Cable) retains 100% overlap; expect pulley-guided continuous line of pull. Compare exact 17-muscle fractional recruitment before swapping equipment mid-session.
Weighted Muscle Overlap
100%
Sum of min(coef A, coef B)
Primary Equipment
Machine → Cable
Same rep/load measurement family
Load Transfer Protocol
Target RPE 7.5–8.5
Never assume 1:1 kg across leverages
Side-by-Side 17-Muscle Recruitment Delta
How primary mover (1.0× set) and synergist (0.5× set) allocation changes when swapping Machine Crunch for Cable Crunch.
| Muscle Group | Machine Crunch | Cable Crunch | Leverage Shift |
|---|---|---|---|
| Abdominals & Trunk Bracing | Primary (100%) | Primary (100%) | Matched |
Load & Volume Conversion: Machine Crunch → Cable Crunch
Worked weight heuristic: a 115 kg set on Machine Crunch (Machine) maps roughly to 45 kg on Cable Crunch (Cable; 2.5 kg jumps, curve: constant cable tension at peak lengthened position). Calibrate set 1 at RPE 8 so e1RM history for Machine Crunch remains unskewed. Zero anatomical muscles are dropped between Machine Crunch and Cable Crunch; 1:1 weekly set volume carries straight across.
Supporting Sports-Science Literature
| Study Title | Lead Author & Year | Verified Link |
|---|---|---|
| An electromyographic analysis of the Ab-Slide exercise, abdominal crunch, supine double leg thrust, and side bridge in healthy young adults: implications for rehabilitation professionals. | Youdas (2008) | PubMed 18978615 ↗ |
| Integration core exercises elicit greater muscle activation than isolation exercises. | Gottschall (2013) | PubMed 22580983 ↗ |
| EMG activation of abdominal muscles in the crunch exercise performed with different external loads. | Moraes (2009) | PubMed 19376473 ↗ |