Why lifting with bent knees hurts more later
Joint angle-specific neuromuscular time course of recovery after isometric resistance exercise at shorter and longer muscle lengths
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
When you push hard with your knee almost fully bent, your muscles work way harder inside—even if the outside force feels the same as when your knee is less bent. This makes your muscles weaker and less active for up to two days after, even if you don’t feel sore or have high blood markers.
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.
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Evidence Score
Participants are randomly assigned to treatment or control groups, minimizing bias. Considered the gold standard for testing whether an intervention causes an effect.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
When you push hard with your knee almost fully bent, your muscles work way harder inside—even if the outside force feels the same as when your knee is less bent. This makes your muscles weaker and less active for up to two days after, even if you don’t feel sore or have high blood markers.
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 546 / 90
Evidence Score
Participants are randomly assigned to treatment or control groups, minimizing bias. Considered the gold standard for testing whether an intervention causes an effect.
Publication
Authors
McMahon G, Onambele-Pearson G
Related Content
Claims (7)
When you do exercises that stretch your muscles more through a bigger movement—like doing full squats instead of tiny half-squats—you may build more muscle tissue than when you stay in a shorter, more restricted movement range.
Exercises that position biarticulate muscles at longer lengths (via joint angle manipulation) produce greater hypertrophy in those biarticulate muscle heads compared to exercises that place them at shorter lengths.
Even though your muscles feel just as sore and your blood shows similar signs of damage after doing leg exercises with your knee bent far back or only slightly bent, your muscles are actually weaker and harder to activate for longer after the deep bend version.
Doing strength exercises with your knee bent further back makes your muscles weaker and harder to activate for up to two days afterward—even when you’re testing them at different knee angles—compared to doing the same exercise with your knee less bent.
After doing leg exercises with your knee bent all the way back, your muscles are weaker not just at that angle—but even more so when you try to use them with your knee only slightly bent, as if your muscle fibers got stretched out and lost their normal power.