MPS spikes after a training stimulus, peaks around 24 hours, returns to baseline by 48-72 hours.
A free, animated muscle protein synthesis curve you can read here or embed on any website, from Scrollchart.
Muscle Protein Synthesis Curve
A training stimulus triggers a cascade from mechanical stress through mTOR activation to ribosomal protein translation. MPS peaks around 24 hours then decays. Protein feeding amplifies this response, particularly via the leucine-mTORC1 axis.
MPB (muscle protein breakdown) runs as a lower, flatter baseline. Net muscle gain requires MPS to exceed MPB for cumulative hours across the week.
Mechanical tension activates phospholipase D, generating phosphatidic acid (PA) which signals to mTORC1. mTORC1 phosphorylates S6K1 and releases 4E-BP1, initiating cap-dependent translation. Leucine independently activates mTORC1 via the Sestrin2-GATOR2 axis. The combined mechanical + nutritional signal produces the peak MPS response seen at 24 hours.
The blue curve shows MPS rate over time. The dashed line is MPB. The shaded area between them represents net protein balance. Time zero is the training stimulus. To maximize weekly net balance, the next training session should arrive before MPS returns fully to baseline (roughly 48-72 hours for most trained individuals).
Good for
Articles on optimal training frequency
Posts comparing once-a-week vs twice-a-week per muscle
Recovery-and-volume content
Protein timing and distribution articles
Source & accuracy
This muscle protein synthesis curve is an editorial illustration built to represent the concept accurately. Where it shows figures, they are typical or representative values chosen to make the relationship clear, not a single underlying dataset. The diagram and its explainer are reviewed and maintained centrally, and updated over time as understanding improves.
The rise and fall of synthesis after training
Muscle protein synthesis is the process of assembling new muscle proteins. A bout of resistance training stimulates a temporary increase in synthesis above resting levels. In trained individuals this elevation rises over the hours after a session, commonly described as peaking somewhere around a day later, then gradually declining back toward baseline over the following one to three days.
The repeated stimulus from regular training, layered on top of adequate protein intake, is what produces growth over weeks and months as many of these elevated windows accumulate.
Why timing and training status matter
In untrained people the synthesis response can stay elevated longer, while in well-trained people it tends to be more efficient and somewhat shorter lived. The duration of the elevated window is part of the rationale for spreading protein across the day and for training a muscle more than once per week, since synthesis returns to baseline well before most weekly schedules come back around.
The peak timing and duration are general estimates that vary between studies and individuals. This is educational information, not individualized nutrition or medical advice.
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Reference
What this is
A free, embeddable, animated muscle protein synthesis curve for any website.
Copy the universal HTML snippet, the WordPress shortcode, or an iframe fallback -
see the WordPress plugin page for details. Any format keeps
the same Core Web Vitals profile and the same explainer text.
By embedding, you acknowledge the diagram and explainer text are served from scrollchart.com and may be updated from time to time to reflect new research or to link to relevant sources within the explainer.
Frequently asked questions
Where can I get a free animated "Muscle Protein Synthesis Curve" for my website?
Scrollchart provides "Muscle Protein Synthesis Curve" as a free, embeddable animated diagram you can add to any website with one line of HTML. No signup is required and there is no watermark. The diagram and its explainer text are served from scrollchart.com, so the embed stays current without any maintenance on your end.
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Copy the HTML snippet from the Scrollchart diagram page and paste it into any post or page in your CMS. It works in WordPress, Webflow, Ghost, Substack, and plain HTML without any plugin or account. The diagram renders as animated SVG directly in your page, so search engines can index the accompanying explainer text.