Research
Hormonal
Phosphorylation of the Ryanodine Receptor 1 (RyR1) by CaMKII and PKA modulates channel activity, with hyperphosphorylation potentially leading to 'leaky' channels, increased open probability, and decreased contractility under resting conditions.
Excessive training stress or fatigue might lead to 'leaky' calcium channels due to phosphorylation changes, reducing force output. Recovery and proper training load management are essential to maintain channel integrity.
GoodQualifiesHIGH confidence
Hyperphosphorylation of RyR1 via PKA and CaMKII may lead to increased dissociation of FKBP12, higher open probability of RyR1 channels and decreased contractility of skeletal muscle under resting conditions.
Why this rating
Review paper detailing molecular interactions.
Source
Ca2+-Dependent Regulations and Signaling in Skeletal Muscle: From Electro-Mechanical Coupling to Adaptation
Sebastian Gehlert et al. · International Journal of Molecular Sciences · 2015
DOI 10.3390/ijms16011066
narrative_reviewCited 181×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
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- Store-Operated Calcium Entry (SOCE) is a critical mechanism for sustaining contractility during repeated contractions and contributes to long-term muscle remodeling by enhancing gene expression via NFAT.Good
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