How Heavy Should You Lift to Make Your Muscles Work Hard?
Comparison of muscle activation and kinematics during free-weight back squats with different loads
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
When doing squats, people tried lifting weights from light to super heavy, all as fast as they could. Their muscles were checked to see how hard they worked.
No biological mechanisms were identified in this study. This may be an epidemiological, observational, or survey-based study that reports associations rather than proposing causal biological pathways.
Systematic Reviews & Meta-Analyses
Max 100Randomized Controlled Trials
Max 90Cohort Studies
Max 72Case-Control Studies
Max 58Cross-Sectional Studies
Max 44Case Reports & Case Series
Max 30Expert Opinion & Narrative Reviews
Max 521 / 44
Evidence Score
A snapshot of a population at a single point in time. Can identify correlations and prevalence, but cannot determine the direction of cause and effect.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
When doing squats, people tried lifting weights from light to super heavy, all as fast as they could. Their muscles were checked to see how hard they worked.
No biological mechanisms were identified in this study. This may be an epidemiological, observational, or survey-based study that reports associations rather than proposing causal biological pathways.
Systematic Reviews & Meta-Analyses
Max 100Randomized Controlled Trials
Max 90Cohort Studies
Max 72Case-Control Studies
Max 58Cross-Sectional Studies
Max 44Case Reports & Case Series
Max 30Expert Opinion & Narrative Reviews
Max 521 / 44
Evidence Score
A snapshot of a population at a single point in time. Can identify correlations and prevalence, but cannot determine the direction of cause and effect.
Publication
Authors
van den Tillaar R, Andersen V, Saeterbakken AH
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Claims (6)
When strong guys do squats as fast as they can, the heavier the weight, the slower they move — even if they're trying to go fast. The heaviest weights always result in the slowest lifts, and this seems to be true for everyone.
When strong guys do fast squats with heavy weights, their leg muscles don't work harder the heavier the weight gets—until they go all the way up to their max. At max weight, two of the three main quad muscles actually fire way more.
When strong guys do fast squats, their thigh muscles turn on in a set order—one muscle first, then another, then a third—and that order doesn’t change no matter how heavy the weight is.
When strong guys do fast back squats with heavy weights, their butt and hamstring muscles work harder the heavier the weight gets — especially the butt muscle, which really kicks in when the weight is 80% or more of their max lift.
When you squat with heavier weights, your butt muscles (glutes) have to work way harder than your thigh muscles (quads), more than you'd expect just from the added weight.