Table I.

Mean adrenal and thymus weights (g per 100 g body weight, ±SEM) for rats from Experiment no. 1 that were exercising (Ex) or sedentary (Sed) for 6 weeks prior to 11 consecutive daily 30 min presentations of 98-dB noise stress or 60-dB background noise. There were no effects of Activity Status or Stress Treatment on mean adrenal or thymus weights. n = number of rats providing tissue weight per group.

Treatment group	Mean adrenal weight (g/100 g body weight (SEM))	Mean thymus weight (g/100 g body weight (SEM))
Ex/Repeated noise	0.0144 (0.0021)	0.0978 (0.0065)
	n = 7	n = 17
Ex/No noise	0.0157 (0.0015)	0.0825 (0.0086)
	n = 8	n = 8
Sed/Repeated noise	0.0125 (0.0027)	0.0979 (0.0043)
	n = 5	n = 17
Sed/No noise	0.0131 (0.0014)	0.0986 (0.0064)
	n = 8	n = 8