Table 2.
Mean values of mean frequency (MNF in Hz) and median frequency (MDF in Hz) between pre- and post-test for exercises 1–4 (N = 33).
| Ex. | Parameter | Pre ± SD | CI | N | Post ± SD | CI | T | df | p | d |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | OEA_r MNF | 52.6 ± 8.8 | 49.4–55.7 | 33 | 40.7 ± 7.7 | 38.0–43.4 | 9.583 | 32 | 0.000 | 1.7 |
| OEA_r MDF | 41.7 ± 8.0 | 38.8–44.5 | 33 | 34.2 ± 5.9 | 32.2–36.3 | 6.705 | 32 | 0.000 | 1.2 | |
| OEA_l MNF | 53.9 ± 8.1 | 51.0–56.8 | 33 | 40.5 ± 7.7 | 37.5–43.4 | 10.027 | 32 | 0.000 | 1.7 | |
| OEA_l MDF | 41.7 ± 6.7 | 39.3–44.0 | 33 | 33.9 ± 6.4 | 31.6–36.1 | 6.756 | 32 | 0.000 | 1.2 | |
| RAB MNF | 66.3 ± 15.6 | 60.8–71.8 | 33 | 55.3 ± 14.1 | 50.3–60.3 | 4.278 | 32 | 0.000 | 0.7 | |
| RAB MDF | 53.4 ± 18.8 | 48.6–58.3 | 33 | 44.6 ± 11.4 | 40.6–48.7 | 3.726 | 32 | 0.001 | 0.6 | |
| 2 | OEA_r MNF | 54.7 ± 10.0 | 51.1–58.3 | 33 | 42.9 ± 7.6 | 40.3–45.6 | 7.614 | 32 | 0.000 | 1.3 |
| OEA_r MDF | 44.3 ± 9.1 | 41.0–47.5 | 33 | 37.0 ± 6.0 | 34.9–39.1 | 4.518 | 32 | 0.000 | 0.8 | |
| 3 | OEA_l MNF | 54.8 ± 8.7 | 51.7–57.9 | 33 | 42.5 ± 6.6 | 40.2–44.9 | 8.514 | 32 | 0.000 | 1.5 |
| OEA_l MDF | 42.2 ± 7.5 | 39.6–44.9 | 33 | 36.3 ± 5.1 | 34.5–38.1 | 4.571 | 32 | 0.000 | 0.8 | |
| 4 | ESL MNF | 80.8 ± 19.08 | 74.0–87.6 | 33 | 45.4 ± 10.5 | 41.6–49.1 | 10.866 | 32 | 0.000 | 1.9 |
| ESL MDF | 59.3 ± 10.5 | 53.6–65.1 | 33 | 36.2 ± 6.3 | 34.0–38.4 | 8.784 | 32 | 0.000 | 1.5 | |
| EST MNF | 65.6 ± 14.0 | 60.6–70.6 | 33 | 57.1 ± 8.2 | 54.3–60.0 | 4.561 | 32 | 0.000 | 0.8 | |
| EST MDF | 55.0 ± 12.6 | 50.5–59.4 | 33 | 49.8 ± 7.3 | 47.2–52.4 | 3.012 | 32 | 0.005 | 0.5 |
Ex. = Exercise number (according to Table 1), SD = standard deviation, CI = 95% confidence interval, N = number of subjects, T = t-value, df = degrees of freedom, p = p-value, d = Cohen’s d effect size, OEA_r = M. obliquus externus abdominis (right-side), OEA_l = M. obliquus externus abdominis (left-side), RAB = M. rectus abdominis, ESL = M. erector spinae lumbalis, EST = M. erector spinae thoracalis.