The sample size was calculated as 24 per group using G*Power software (G*Power; Franz Faul, University of Kiel, Germany)11 and with a 95% test power, 0.80 effect size, and α=.05. The participants were randomly divided into 2 groups (IMT group: n=24:male=12andfemale=12;controlgroup:n=24:male=12 and female=12) using the random allocation software by one of the members of the research team as recommended by the CONSORT guidelines. One patient (male) from the IMT group was excluded from the study because he did not return for the follow-up treatment. Figure 1 presents the flow diagram of this study. Table 1 presents the descriptive statistics for age, height, body mass, body mass index, and lumbar arch index.