Does the fatigue resistance of rabbit tibiae vary with age from youth to middle age?
A difference in fatigue behavior due to sex was not detected, but there was a large increase in fatigue resistance with age. This correlated with increased BMD and parallels a reduced risk of stress fracture due to age in military recruits. Skeletal "maturation" may play an important role in determining stress fracture risk. Increased risk in females may be due to mechanisms other than those that determine material behavior.
Gradual loss of preBötC NK1R neurons may be an underlying factor of sleep-disordered breathing, in particular of central sleep apnea.