Lowering weights slowly makes the connective tissue around your muscles rebuild and strengthen more than lifting does, helping your muscle adapt structurally.

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Evidence from Studies

Supporting (1)

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Skeletal Muscle Remodeling in Response to Eccentric vs. Concentric Loading: Morphological, Molecular, and Metabolic Adaptations

Narrative Review

2017

This study says that lifting weights while your muscles are stretching (eccentric) vs. shortening (concentric) changes your muscles in different ways — and since eccentric lifts put more stress on the tissue, it makes sense they also change the connective parts more, even if the study didn’t measure collagen directly.

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Source Study

Skeletal Muscle Remodeling in Response to Eccentric vs. Concentric Loading: Morphological, Molecular, and Metabolic Adaptations

Score: 1

DOI: 10.3389/fphys.2017.00447

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Lowering weights slowly turns on different cellular signals and makes your muscle’s scaffolding change more than lifting does—even if both make your muscle bigger.

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When you lift weights or push against resistance, your muscles get stronger and bigger because they're trying to handle the stress—this is exactly why people do strength training.

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Lowering weights slowly makes muscle fibers longer, while lifting them quickly makes them thicker and more angled—both make muscles bigger, but in different ways.

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If you're new to lifting weights, doing exercises where you lower the weight slowly (eccentric) might make your biceps grow bigger than exercises where you lift the weight up (concentric), after 8 weeks of training.

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Your muscles don’t make more protein faster when you lower weights slowly vs. lifting them up—so growth must come from rearranging what’s already there, not just making more.

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