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RIGSBY, L. W., R. K. DISHMAN, A. W. JACKSON, G. S. MACLEAN, and P. B. RAVEN. Effects of exercise training on men seropositive for the human immunodeficiency virus-l. Med. Sci. Sports Exerc., Vol. 24, No. 1, pp. 6–12, 1992. We examined the effects of chronic exercise on fitness and immune status in Caucasian males (34.9 ± 5.6 yr) diagnosed by Western Wot as seropositive for the HIV-l virus. The exercise regimen involved 12 wk of l h sessions 3 d · wk: 20 min of cycle exercise at 60–80% HRreserve was followed by 35 min of strength and flexibility training. After matching subjects on health status (modified Walter Reed criteria), subjects (N = 37) were randomly assigned to exercise or a counseling control condition. Changes in strength, responses to the YMCA cycle test, and serum lymphocytes were tested by MANOVA in a condition (exercise or counseling)-by-time (pretest, posttest) design with repeated measures on time. Results indicated significant (P < 0.001) group-by-time interactions for strength (N · m) (chest press and leg extension) and for HR (beats · min-1) and tota time (TT) on the cycle test at 150 W. Strength and TT increased and HR decreased in the exercise condition, while control subjects did not change. Total leukocyte, lymphocyte, CD4+, and CD8+ cell counts, and the CD4+/CD8+ ratio were statistically unchanged for each condition. We conclude that HIVl+men, including those symptomatic for AIDS-related complex, can experience significant increases in neuromuscular strength and cardiorespiratory fitness without changes in lymphocyte phenotypes or clinical) diagnosis when the exercise regimen is prescribed and monitored in accordance with ACSM guidelines for healthy adults.