The Study
Effect of insulin upon membrane‐bound (Na+ + K+)‐ATPase extracted from frog skeletal muscle.
This study is like watching how a car engine part works when you take it out of the car and test it in a lab. The scientists saw that insulin made a certain enzyme work faster in frog muscle cells in a dish. But this doesn’t prove it works the same way in a real frog or in people.
Analysis score
Maximum 44 for a cross-sectional study.
Where the score came from
Insulin tells muscle cells to work better by turning up a tiny pump that moves salt in and out. This pump needs energy and works best when insulin gives it a boost—especially when energy or salt levels are low.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 510 / 100
Quality score
Snapshots of a population at a single point in time, or descriptions of small groups. Can identify correlations and prevalence, but cannot determine cause and effect.
Key takeaways
Summary
Based on the study abstract and findings.
- 1This shows insulin helps muscles manage salt and energy more efficiently, which is important for muscle function and nutrient uptake, especially after eating.
- 2Insulin made the salt pump 10% to 53% stronger under normal conditions, and up to 400% stronger when salt and energy were low.
- 3It didn’t help when the pump was already working as hard as it could.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
The Journal of Physiology
Year
1975
Authors
W. A. Gavryck, R. Moore, R. Thompson
Related Content
Claims (7)
When insulin is present, it tells muscle cells to pump more sodium and potassium around, which creates a better environment for the cell to pull in more creatine — a compound that helps muscles store energy.
Insulin helps muscles pull in more creatine by boosting a cellular pump that creates the right conditions for creatine to get inside.
Insulin can boost a tiny cellular pump in frog muscle cells, and it works way better when certain conditions like low salt or energy levels are present.
Insulin helps a cellular pump work better when fuel levels are low, but doesn’t make it go faster when everything’s already maxed out — it’s like giving the pump a sensitivity boost, not a power upgrade.
Insulin boosts a specific cellular pump in frog muscle cells, but this boost gets completely stopped by a chemical called ouabain — meaning insulin only affects that particular pump, not others.
Insulin doesn't boost the pump activity in frog muscle cells when it's already running at full speed, which suggests insulin helps the pump respond better to signals instead of making it work harder.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.