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Effects of eccentric hamstring training on lower extremity strength and landing kinetics in female recreational athletes

Salcı, Yaşar
The purpose of this study was to display increase in eccentric hamstring strength after 10-weeks training program. Secondly, if such an increase occurred, would this strength change result in altered landing kinetics and improved jumping performance? 27 recreational female athletes assigned into experimental (n = 14) and control (n = 13) groups. Baseline measures of landing kinetics were collected using a force plate, strength data and proprioceptive measurements were evaluated using an isokinetic dynamometer and vertical jump performance were determined by a jumping mat. Results indicated that NHST group increased their eccentric hamstring strength after eccentric strength training program (week-1 = 233.6±27.5, week-10 = 253.8±28.4 Nm/kgbw; p<.05). The results demonstrated that there were significant differences in landing mechanics for NHST group. PVGRF (week-1 = 6.2±0.9, week-5 = 5.3±0.9; p<.05), PAPGRF (week-1 = 1.1±0.2 & week-10 = 0.8±0.3; p<.05) and APImp results demonstrated significant differences in trained group (week-1 = 78.1±13.6 & week-10 = 67.8±9.2; p<.05). NHST group exhibited significant increase in vertical jumping ability (week-1 = 0.25±0.0 & week-10 = 0.27±0.0 cm; p<.01). This study supported the following points: 1) increases in the eccentric hamstring strength were evident after NHST program, 2) the increases in isokinetic strength were sufficient to cause alterations in landing kinetics to decrease the applied joint forces, so the NHST program would be an influential factor in decreasing the lower extremity injuries, and 3) the increase in the efficiency of force transfer at the final take off phase of jumping contributed to a higher performance in vertical jump.