Year of Publication
Date of Thesis
Master of Science
Exercise and Sport Sciences
Purpose: The purpose of study was to determine if three discrete levels of soreness can be identified using various magnitudes of eccentric triceps exercise in non-resistance trained, college-aged students. Methods: Male (n=12) and female (n=12) subjects were recruited and randomly assigned to a 20-, 40-, or 60-repetition group (n=8). Subjects performed maximal eccentric triceps contraction at 90''s-1 on a Cybex isokinetic dynamometer. Measurement of peak torque (PT), arm circumference (2, 6, and 9 cm), relaxed arm angle (RANG), elbow range of motion (ROM), descriptor differential scale (DDS) (sensation and unpleasantness), and creatine kinase (CK) were done at baseline and 24, 48,72, and 96 h post-soreness induction. A 3 x 5 repeated-measure ANOVA was then done for each dependent variable to assess interactions as well as time- and group-main effects. To eliminate a dampening effect of baseline values on group data, a univariate ANOVA was also done to determine if groups were similar at baseline. lf they were, a univariate ANOVA on group was done collapsing all time periods but excluding baseline. Results: A reduction in PT was proportionate to the amount of exercise, as strength decreased by 13.6%, 32.9%, and 47 .3% following 20-, 40- and 60-repetitions, respectively, compared to baseline for all time points combined. Arm circumference (2 cm) was significantly different between 20- and 60- repetition groups, whereas RANG was significantly different between the 20- and 40- and 20- and 60-; there were no differences between the 40- and 60- repetition groups for either variable. Also, G0-repetitions reduced ROM more than 20-repetitions, but no difference was found for 40-repetitions. Surprisingly, DDS (sensation) was same for all three groups, but DDS (unpleasantness) was significantly different between the 20- and 60- repetition groups, as was CK. Changes in all variables except CK peaked at 48 h and had not returned to baseline at 96 h. Conclusion: Under the present experimental conditions, DOMS can be manipulated into three.discrete levels as measured by strength loss (PT) and into two levels when assessed with changes in arm circumference at 2 cm, ROM, RANG, and unpleasantness of soreness. This information may be helpful to researchers, as well as health care and exercise professionals, when assessing efficient treatment and prevention strategies for DOMS.
Dubey, Ankita, "Manipulating the Extent of Delayed Onset Muscle Soreness" (2010). Ithaca College Theses. Paper 315.