The Claim

Acute increases in systemic anabolic hormones (testosterone, growth hormone, IGF-1) following resistance exercise do not cause muscle hypertrophy in healthy adults.

Source: An Evidence-Based Narrative Review of Mechanisms of Resistance Exercise–Induced Human Skeletal Muscle Hypertrophy

What the research says

Roughly balanced

Support and challenge are close. The picture may shift as more studies come in.

Supports
1score
Challenges
0score

These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.

Cause and effect
1 study reviewed
In plain English

Just because your testosterone, growth hormone, and IGF-1 levels spike after a workout doesn't mean those spikes are what make your muscles grow.

See the scientific wording

Acute increases in systemic anabolic hormones (testosterone, growth hormone, IGF-1) following resistance exercise are not causally linked to muscle hypertrophy in healthy adults.

What the research says

1 study

  1. Study: An Evidence-Based Narrative Review of Mechanisms of Resistance Exercise–Induced Human Skeletal Muscle Hypertrophy

    This study says that even though your body releases muscle-building hormones after lifting weights, those hormones aren’t what actually makes your muscles grow — it’s more about what happens inside the muscle itself.

Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies

Fit Body Science verdict — we translate health claims into clear verdicts backed by peer-reviewed research.

Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.