Deficit Deadlift vs Smith Machine Deadlift
Swapping Deficit Deadlift (Barbell) for Smith Machine Deadlift (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 Deficit Deadlift for Smith Machine Deadlift.
| Muscle Group | Deficit Deadlift | Smith Machine Deadlift | Leverage Shift |
|---|---|---|---|
| Hamstrings | Primary (28%) | Primary (28%) | Matched |
| Glutes (Gluteus Maximus / Medius) | Primary (25%) | Primary (25%) | Matched |
| Lower Back (Spinal Erectors) | Primary (20%) | Primary (20%) | Matched |
| Quadriceps | Secondary (12%) | Secondary (12%) | Matched |
| Traps (Upper & Mid Trapezius) | Secondary (8%) | Secondary (8%) | Matched |
| Forearms & Grip | Secondary (7%) | Secondary (7%) | Matched |
Load & Volume Conversion: Deficit Deadlift → Smith Machine Deadlift
Worked weight heuristic: a 100 kg set on Deficit Deadlift (Barbell) maps roughly to 115 kg on Smith Machine Deadlift (Machine; 5 kg jumps, curve: cam-matched resistance across sticking points). Calibrate set 1 at RPE 8 so e1RM history for Deficit Deadlift remains unskewed. Zero anatomical muscles are dropped between Deficit Deadlift and Smith Machine Deadlift; 1:1 weekly set volume carries straight across.
Supporting Sports-Science Literature
| Study Title | Lead Author & Year | Verified Link |
|---|---|---|
| Hip thrust and back squat training elicit similar gluteus muscle hypertrophy and transfer similarly to the deadlift. | Plotkin (2023) | PubMed 37461495 ↗ |
| Hip thrust and back squat training elicit similar gluteus muscle hypertrophy and transfer similarly to the deadlift. | Plotkin (2023) | PubMed 37877099 ↗ |
| An electromyographic analysis of sumo and conventional style deadlifts. | Escamilla (2002) | PubMed 11932579 ↗ |