The impact of physical exercise on calcium balance in healthy subjects during prolonged hypokinesia

Effects of physical activity on sclerostin concentrations

“…Significantly lower serum Ca levels after training were probably associated with higher calcium utilization, as well as with changes in electrolyte concentrations and acid-base balance. The above changes depends on intensity of physical activity and load [26].…”

Chronic head‐down‐tilt sleeping as physiological regulator of bone remodelling during diminished muscular activity in humans

“…Physical exercise is contraindicated in HDT sleeping with chronic PFR. Studies (Zorbas et al, 1988b(Zorbas et al, , 1988c(Zorbas et al, , 1995Tsiamis et al, 2008;Deogenov et al, 2009) have shown that physical activity may not contribute to fluid volume expansion. Fluid volume is neither intravascular nor intracellular fluid and therefore does not contribute to vascular volume.…”

Muscle Potassium and Potassium Losses During Hypokinesia in Healthy Subjects

“…During HK, the glycogen stores are depleted and the synthesis of new glycogen is impaired [18] and the anaerobic glycolysis becomes less efficient than oxygen-dependent mitochondrial pathways and the cell is eventually injured thereby interfering with electrolyte deposition [5,6]. Because K + losses increase in K + -deficient muscle, this reaction is probably in the nature of a reverse-regulating reflex of K + deposition during [29].…”