Momentum as an Injury Risk
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Momentum-assisted lifting increases stress on joint structures and injury potential while decreasing the demand on the target muscles.
Detail
Momentum-assisted lifting gives the appearance of greater muscle strength, but it actually decreases demands on the target muscle groups and increases stress on the joint structure. Common momentum techniques include using assisting muscle groups to begin a lift (e.g., using back muscles and trunk movement to initiate barbell curls) and bouncing the bar off the chest during the bench press — which, in addition to the high injury potential, reduces the training effect on the target muscles (chest, shoulders, triceps).
In the cheat system, care must be exercised: using heavier resistance and a cheating movement to start the resistance moving increases the chance of injury (for example, swinging the hips and lower back during arm curls places additional stress on the lower back) (Fleck & Kraemer, 1997). While momentum has its place in sporting events, it should play a minor role in weight-training programs.
Key facts
- Momentum increases stress on joint structures and injury potential.
- Bouncing the bar off the chest in the bench press has high injury potential.
- Cheat-system swinging of the hips/lower back stresses the lower back.
- Momentum reduces the training stimulus to the target muscles.
Connections
- Momentum in Resistance Training — the momentum principle.
- Movement Speed as a Safety Factor (Slow, Controlled Lifting) — slow lifting minimizes momentum.
- Cheat System — cheating increases injury chance.
- Proper Form as Injury Prevention — proper form limits unwanted momentum.
Sources
Topics like this depend on your health and history. A qualified coach or clinician can apply it to you safely.
Educational content only — not medical advice. Always consult a qualified professional for individualized guidance, especially around injury, pregnancy, or medical conditions.