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. 2009 May 13;102(2):992–1003. doi: 10.1152/jn.00085.2009

FIG. 8.

FIG. 8.

Gain-scaling trends for each muscle group. A: summary of regression slopes relating gain-scaling and the timing of subsequent epochs of phasic muscle activity (R1–VOL). Gain-scaling was calculated within each epoch and the regression was done with respect to the mean time for that epoch [R1 = 0.0325 s (32.5 ms); R2 = 0.0625 s; R3 = 0.09 s; VOL = 0.15 s]. Each bar represents the regression slope (mean ± SE) for the indicated muscle sample. □, the small perturbation (1.25 Nm) condition; Inline graphic, the large perturbation (2.5 Nm). *, significant (t-test, P < 0.05, slope of regression <0) negative relationship between subsequent epochs of activity and gain-scaling. B: direct comparison of gain-scaling (mean ± SE) in R1 and R3 for each muscle group in the small perturbation condition. □, gain-scaling in the R1 epoch; Inline graphic, gain-scaling in the R3 epoch. Note that all muscle samples demonstrate a trend toward decreased gain-scaling in the R3 epoch though only 2 of the conditions (*) demonstrate significant decreases (paired t-test, P < 0.05, gain-scaling in R3 < gain-scaling in R1). C: same format as B except for the large perturbation condition.