Among highly trained people, performing resistance exercises with higher velocity loss during sets may result in slightly greater thickening of the quadriceps muscle after six weeks, compared to...

Pro

Against

Mechanism

Synthesis from 1 study

How it works

When you keep lifting until you can't move the weight as fast, your muscles have to work harder, activating more fibers and building up chemical byproducts. This triggers signals that tell the muscle to build more protein, making it slightly thicker over time — even if you don't get stronger than...

Most probable mechanism

In Simple Terms

When lifting weights until movement slows significantly, the muscles work harder to keep pushing, recruiting more muscle fibers and building up waste products like lactate. This combination of intense force and chemical buildup triggers signals inside muscle cells that tell them to build more protein, leading to thicker muscle fibers over time — even if overall strength doesn't increase further.

Causal chain

Reduced movement velocity during resistance exercise indicates increased neuromuscular fatigue, requiring greater recruitment of high-threshold motor units to maintain force output.

Supported by evidence

which leads to

Increased recruitment of Type II muscle fibers elevates mechanical tension and induces intracellular metabolic stress, including lactate accumulation, hypoxia, and cell swelling.

Supported by evidence

which leads to

Metabolic stress and mechanical tension activate intracellular signaling pathways, including mTORC1, CaMKII, and sarcolipin-related systems, which promote anabolic processes.

Supported by evidence

which leads to

Sustained activation of anabolic signaling increases the rate of muscle protein synthesis beyond the rate of breakdown, resulting in net accretion of myofibrillar proteins and increased muscle fiber cross-sectional area.

Verified by multiple studies

Evidence from Studies

Supporting (1)

Community contributions welcome

Effects of Low- Versus High-Velocity-Loss Thresholds With Similar Training Volume on Maximal Strength and Hypertrophy in Highly Trained Individuals.

Randomized Controlled Trial

Human

2023 Apr 1

Contradicting (0)

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No contradicting evidence found

Gold Standard Evidence Needed

According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.

Source Study

Effects of Low- Versus High-Velocity-Loss Thresholds With Similar Training Volume on Maximal Strength and Hypertrophy in Highly Trained Individuals.

Score: 60

DOI: 10.1123/ijspp.2022-0161

Similar Assertions

For athletes with advanced strength training experience, two different ways of performing resistance exercises—either stopping before fatigue builds up or pushing until fatigue is high—result in the same improvement in maximum strength for squats and bench presses when the total amount of work is kept the same over six weeks.

81%

When performing squats with a heavier weight (70% of maximum strength) instead of a lighter weight (60% of maximum strength), the quadriceps muscle on the front of the thigh shows about 10% higher electrical activity, regardless of how slowly the movement is performed.

79%

In young men with prior training experience, performing more sets of resistance exercises at a lighter weight led to a small but measurable increase in thigh muscle size over six weeks, while fewer sets at a heavier weight did not produce a significant change.

78%

If you're someone who's been lifting weights for a while, doing the same amount of heavy training over 9 weeks will make your thigh muscles grow by about half a centimeter — whether you spread your workouts over 2 or 4 days a week.

77%

After six weeks of resistance training with either low or high levels of fatigue, highly trained people did not gain more muscle mass or improve their power in leg exercises, even though they got stronger and their muscles thickened slightly.

77%