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Comparison of sEMG values between the four-point hand−knee and hand−foot kneeling positions with the same limb lifted. RRA, right rectus abdominis; LRA, left rectus abdominis; REO, right external oblique; LEO, left external oblique; RES, right erector spinae; LES, left erector spinae; RMF, right lumbar multifidus; LMF, left lumbar multifidus. *: statistically significant, p < 0.05.
