The relative effectiveness of three forms of visual knowledge of results on peak torque output.

Therapists often search for more efficient and effective ways to provide patients with information regarding their performance. The purpose of this study was to determine whether certain types of machine-based visual displays could be used as a source of error-correction information to facilitate the immediate and/or delayed performance of a maximal effort isokinetic movement of the knee. The relative effectiveness of the knowledge of results (KR) provided by visual displays that differed in degree of precision and presentation schedule were compared during a practice and retention test phase. Twenty-four healthy male subjects (mean age = 22 years) performed isokinetic extension and flexion of the knee at low (120 degrees/sec) and high (240 degrees/sec) exercise speeds. A no-KR maximal effort pretest was followed by two practice sessions during which three groups each received one form of visual KR and a fourth group practiced without KR. A no-KR maximal effort posttest was administered to all groups following a 1-day rest interval. Although visual KR did not result in any significant differences in mean peak torque output during practice, between-group comparisons of pretest to posttest changes in mean peak torque indicated that groups receiving visual KR in addition to practice demonstrated significantly greater (p < .03) improvements in mean peak torque in three of the four conditions tested when compared with the group that practiced without KR.(ABSTRACT TRUNCATED AT 250 WORDS)