ABSTRACT
Delayed onset muscle soreness [DOMS], which occurs after eccentric exercises, may cause some reduction in ability in sport activities. For this reason, numerous recovery strategies have been used in an attempt to control the inflammatory-type response. Physical modalities have demonstrated no effect on the alleviation of muscle soreness or other DOMS symptoms. Whole-body vibration [WBV] has been suggested as a viable warm-up in sport fields. However, there is a lack of scientific evidence to support the protective effects of WBV-Training [WBVT] on muscle damage. Thirty-two healthy untrained volunteers randomly assigned into two groups: WBVT [n=15] and control [n=17]. Subjects performed 6 sets of 10 maximal isokinetic [60[degree sign].s-1] eccentric contractions of knee extensors with dominant limb on a dynamometer. In the WBVT group before eccentric exercise, whole body vibration was applied using a vibratory platform [Power Plate, 35 Hz, 5 mm peak-to-peak amplitude], with 100 [degree sign] knee flexion for 60 seconds while no vibration was applied in the control group. DOMS criteria [serum creatine kinase [CK], pressure pain threshold [PPT], muscle soreness, thigh circumference and maximal voluntary isometric exertion] were recorded at baseline, immediately after, 1to 14 days postexercise. WBVT group showed significant reduction of DOMS symptoms in terms of lower CK levels, less PPT, less muscle soreness and lower maximal isometric voluntary strength loss compared to the control group [P< 0.05] However, no significant effect on thigh circumference was evident [P> 0.05]. The findings of this study showed that WBVT administered before eccentric exercise may control and prevent DOMS and enhance the quadriceps muscle activity. Further investigation should be undertaken to ascertain the effectiveness of WBVT in athletes
ABSTRACT
Delayed-onset muscle soreness [DOMS] after eccentric exercises would limit the efficacy of athletes. This study was designed to investigate the rate of DOMS in luteal and follicular phases of menstrual cycle [an indirect assesment of possible role estrogen] among healthy untrained female students Twenty-six healthy untrained female students, ranged between 18-25 years old were assigned into two groups based on their menstrual cycle: Mid-luteal [ML] [n=14] and Mid-follicular [MF] [n=12]. To induce DOMS, all participants walked downwardly on treadmill, declined 20 degrees, 5 km/h, for 30 minutes. DOMS criteria [serum creatine kinase, pressure pain threshold, muscle soreness and thigh circumference], and average peak torque of dominant knee extensor were recorded at baseline, 24 and 48 hours post-exercise. Both groups showed significant perception of DOMS symptoms as compared to their baseline levels [p<0.05]. Although, the severity of DOMS was lower in the ML group as compared with the MF group, but the difference was not significant. The findings of this study showed that DOMS got perceived in both experimental groups with a milder severity in ML group. The milder severity in the ML group may be contributed to the higher level of estrogen