Variability in corticomotor responses to experimental hamstring pain
±, SD, pain
Changes to the representation of biceps femoris in response to sustained experimental pain were variable. Indeed, the mean absolute Δvolume ± SD in the experimental group was 177% ± 364%, and the mean absolute Δarea ± SD was 87% ± 130%. Conversely, the control group exhibited little variability in corticomotor responses over time. The mean absolute Δvolume ± SD in the control group was 9% ± 3%, and the Δarea + SD in this group was 12% ± 7%.Based upon the criteria outlined in Section 2, 12 (46%) participants in the experimental group were classified as facilitators, 12 (46%) as depressors, and 2 (8%) as nonresponders in terms of map volume. In terms of map area, 10 (39%) participants in the experimental group were classified as facilitators, 11 (42%) as depressors, and 5 (19%) as nonresponders. Center of gravity displacement ranged from 0 to 3 cm. All participants in the control group were considered to be “nonresponders.”