Table 2. The mean relative times (%) at four muscle movement stages. Data are means ( ±SD). Young Group Older Group Hip Flexors’ Concentric Contraction 13.50 (6.88) .00 (.00) * Extensors’ Eccentric Contraction 41.04 (9.23) 69.37 (5.12) * Extensors’ Concentric Contraction 36.81 (2.13) 28.74 (3.66) * Flexors’ Eccentric Contraction 1.28 (1.94) 1.88 (1.70) Knee Flexors’ Concentric Contraction 6.85 (4.44) 28.13 (13.72) * Extensors’ Eccentric Contraction 58.25 (5.43) 42.29 (14.45) * Extensors’ Concentric Contraction 30.39 (3.12) 22.67 (6.63) * Flexors’ Eccentric Contraction 4.50 (2.13) 6.91 (6.10) Ankle Flexors’ Concentric Contraction .00 (.00) .00 .00) Extensors’ Eccentric Contraction 67.81 (2.49) 71.15 (4.58) Extensors’ Concentric Contraction 32.00 (2.44) 28.54 (4.71) Flexors’ Eccentric Contraction .18 (.48) .30 (.53) * significant difference between groups, p<0 .05.