Changes in lumbopelvic motion and trunk muscle activity during 2000 m rowing ergometer trial

The changes in lumbopelvic motion and trunk muscle activity occurring during 2000 m rowing elite collegiate rowers (five men three women with careers of 5.6±2.1 years) were investigated. pelvic inclination the lumbar angle calculated. Surface electrodes attached to rectus abdominis, external oblique, internal multifidus, erector spinae, latissimus dorsi, femoris, biceps femoris. Three consecutive strokes at 20% 80% time-points a race simulation analyzed. root-mean-square was calculated early drive phase, late recovery phase. Root-mean-square amplitude normalized by maximum voluntary contraction. Between two time-points, paired t-tests for each Wilcoxon signed-rank tests performed. Biceps femoris phase abdominis decreased significantly prolonged rowing. Posterior pelvis catch middle positions, flexion position, spinae multifidus increased inability maintain set position owing may lead excessive posterior tilt position. Since an increase occurred apparent opposition function, repetitive have control intersegmental spine.