Figure 2. Values are expressed as the mean ± SD (n=8). a: significant difference from 300 deg/sec (p < 0.01). b: significant difference from 480 deg/sec (p < 0.01). c: significant difference from 660 deg/sec (p < 0.01). *: significant difference (p < 0.05). **: significant difference (p < 0.01)