The literature shows methodological differences in measuring physical activity in relation to frailty in the elderly. Therefore, the aim of the present study, part of FIBRA (the Frailty in Brazilian Elderly study), was to investigate relationships between frailty and measurements of physical activity. The study used a probabilistic sample of 689 elderly (72.28 ± 5.40 years; 68.21% women). An adapted version of the Minnesota Leisure Time Physical Activity Questionnaire was used and two criteria were established for measuring physical activity: regular physical exercise and weekly calorie expenditure during physical exercise and household activities. Of the total sample, 15.09% scored on weight loss, 17.13% on fatigue, 16.96% on low grip stre...