A mail survey of upper Midwest family practice and internal medicine residency program directors was performed to determine the prevalence and characteristics of exercise stress test training. Two mailings provided a 68% response rate for the 184 programs surveyed. Internal medicine programs were significantly more likely to offer exercise stress test training than family practice programs (57% vs 34%). Overall, an estimated 31% of family practice and internal medicine residency graduates are performing exercise stress tests in their practice. Programs provided an average of 7.3 hours of didactic instruction and 32.7 stress tests per resident. A minority (43%) had an established minimum number of exercise stress tests recommended for competency. Programs with and without exercise stress test training did not differ significantly with respect to age, size of program, or size of community. There were some interstate differences in the extent of exercise stress test training provided by family practice residency programs. Internal medicine programs were more likely to require a minimum number of treadmill tests. Otherwise there were few differences between family practice and internal medicine program instruction in exercise stress test training. Family practice program directors were more likely to believe that their residents should be taught this procedure and to include family physicians in their panel of instructors. Specific guidelines should be created to assure adequate stress test training for interested residents.