Effects of a power-focussed resistance training intervention on backward grinding performance in America's Cup sailing.

This study determined whether backward grinding performance in America's Cup sailing could be improved using a training intervention to increase power capability in the upper-body pull movement. Fourteen elite male sailors (34.9 +/- 5.9 years; 98.1 +/- 14.4 kg; 186.6 +/- 7.7 cm) were allocated into experimental (speed-focussed) and control groups. Grinding performance was assessed using a grinding ergometer and an instrumented Smith machine measured force, velocity and power during the bench pull exercise. Conventional training produced significant improvements in bench pull 1 RM (5.2 +/- 4.0%; p = 0.016) and maximum force production (5.4 +/- 4.0%; p = 0.014). Speed-focussed training improved maximum power (7.8 +/- 4.9%; p = 0.009), power at 1 RM (10.3 +/- 8.9%; p = 0.019) and maximum velocity (8.4 +/- 2.6%; p = 0.0002). Backward grinding performance showed greater improvements in the experimental group than the control group for moderate (+1.8%) and heavy load (+6.0%) grinding. Changes in maximum power output and power at 1 RM had large correlations (r = 0.56-0.61) with changes in both moderate and heavy load grinding performance. Time to peak force had the strongest relationship, explaining 70% of the change in heavy load grinding performance. Although the performance benefit was not entirely clear the likelihood of a detrimental effect was low (< 5%) and therefore implementation could be recommended.