Tag: muscle physiology
How Muscle Signals Protect the Brain: The Emerging Science of Myokines
Muscle contraction releases signaling molecules called myokines that protect brain health, support memory, and counteract cognitive aging. Different exercise types…
Why muscle growth takes years, not months: the cellular biology behind training limits
Muscle growth is constrained by cellular-level processes—specifically myonuclei accretion and protein synthesis rates—that operate on timescales of months to years,…
Muscles Clear Glucose Two Ways After Eating—Movement Activates a Second Pathway
After meals, muscles clear glucose through two pathways: insulin-signaled and contraction-activated. Light movement activates a second pathway, accelerating glucose clearance…
Skeletal muscle’s dual role: Why inactivity silences critical body signaling
Skeletal muscle operates in two distinct biochemical modes: active signaling and metabolic silence. Inactive muscle disengages from whole-body communication, raising…
How muscle movement clears blood glucose through a second pathway independent of insulin
Muscle clears glucose through two pathways after meals: one insulin-dependent and one activated by muscle contraction alone. Light post-meal movement…
Muscle Loss in Aging Is Fundamentally a Nerve Problem, Study Shows
New research reveals that strength in aging is determined by motoneuron excitability—neural signal quality—not muscle mass alone. Master athletes retain…
Why Vitamin D Deficiency Targets Your Fast-Twitch Muscles—and Why Falls Risk Follows
Vitamin D deficiency selectively shrinks type II fast-twitch muscle fibers while sparing slow-twitch fibers, a mechanism that directly explains elevated…
How Creatine Actually Works: The Phosphate Shuttle That Powers Your Muscles
Creatine supplementation does not work by increasing water retention or providing energy like caffeine. Instead, it enhances the phosphocreatine shuttle…