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Figure 2. Average concentrations of cortisol (dashed lines) and growth hormone (GH, solid lines) during the first and second halves of nocturnal sleep in young men after a day without exercise (left), after moderate exercise during the preceding afternoon (40 km of biking, middle), and after intense distress (120-150 km of biking, right). Per cent values of hormonal concentrations are shown with the nightly average concentration set to 100 %. Note, intense exercise abolishes the typical early sleep endocrine pattern with minimum cortisol concentrations and maximum GH concentrations. Data are from Kern et al. 1995.

Figure 2. Average concentrations of cortisol (dashed lines) and growth hormone (GH, solid lines)
during the first and second halves of nocturnal sleep in young men after a day without exercise (left),
after moderate exercise during the preceding afternoon (40 km of biking, middle), and after intense
distress (120-150 km of biking, right). Per cent values of hormonal concentrations are shown with the
nightly average concentration set to 100 %. Note, intense exercise abolishes the typical early sleep
endocrine pattern with minimum cortisol concentrations and maximum GH concentrations. Data are
from Kern et al. 1995.