Effect of preconditioning by light load eccentric exercise versus heat on markers of XXXX in collegiate males.

@entity1 @entity908 @entity880 @entity925 @entity121
BACKGROUND: Delayed onset @entity925 (DOMS) occurs following unaccustomed or intense bouts of exercise. Previous research has demonstrated that that preconditioning with low load exercise or heat relieves @entity925 . However, actively warming up the muscles with exercise may be an effective alternative. OBJECTIVES: This study compared preconditioning effect of light load eccentric exercise and heat using microwave diathermy on markers of @entity121 in collegiate males. @entity1 AND METHODS: Thirty six sedentary collegiate males were randomly assigned into two experimental groups: 10% Eccentric exercise group (10% ECC group) and Microwave diathermy group (MWD group). Both the groups performed 30 repetitions of maximal eccentric exercise (Max-ECC) of the elbow flexors. The 10% ECC group performed light load eccentric exercise (10% ECC), five sets, six repetitions using a dumbbell set at 10% of maximal voluntary isometric contraction strength (MVC), 2 days prior to Max-ECC. The MWD group received heat using microwave diathermy (150 watts, 20 minutes) one day prior to Max-ECC. Changes in MVC, range of motion (ROM), upper arm circumference, soreness, were assessed before and 24-72 hours after whereas serum @entity908 kinase activity and @entity880 dehydrogenase (LDH) activity up to 48 hours following the Max-ECC were compared between groups by a mixed model ANOVA. RESULTS: No significant difference (P > 0.05) were found between the groups for changes in all variables post Max-ECC, except for LDH activity showing significant interaction effect (P = 0.04). CONCLUSIONS: Preconditioning with light load eccentric exercise and heat using microwave diathermy treatment did not differ in their effects on @entity121 markers after Max-ECC. However, with time their effects on LDH activity were found to be different.
