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. 2019 Apr 24;10:451. doi: 10.3389/fphys.2019.00451

FIGURE 4.

FIGURE 4

Changes in the trunk extensor isometric test (A), trunk flexor isometric test (B), side bridge test (C), and front plank test (D) values before and after the intervention study. P-value [time, group, and interaction (timegroup)] of repeated measures analysis of variance. P < 0.05, ∗∗P < 0.01, ∗∗∗P < 0.001 obtained by Student’s paired t-test. PAR, physical activity recommendations for adults proposed by the World Health Organization group; HIIT, high intensity interval training group; WB-EMS, whole-body electromyostimulation group.