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P R Bar - One of the best experts on this subject based on the ideXlab platform.
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warm up stretching and massage diminish harmful effects of eccentric exercise
International Journal of Sports Medicine, 1994Co-Authors: J B Rodenburg, D Steenbeek, P Schiereck, P R BarAbstract:The effect of a combination of a warm-up, stretching exercises and massage on subjective scores for delayed onset muscle soreness (DOMS) and objective functional and biochemical measures was studied. Fifty people, randomly divided in a treatment and a control group, performed eccentric exercise with the forearm flexors for 30 min. The treatment group additionally performed a warm-up and underwent a stretching protocol before the eccentric exercise and massage afterwards. Functional and biochemical measures were obtained before, and 1, 24, 48, 72 and 96h after exercise. The median values at the five post-exercise time points differed significantly for DOMS measured when the arm was extended (p = 0.043). Significant main effects for treatment were found on the maximal force (p = 0.026), the flexion angle of the elbow (p = 0.014) and the creatine kinase activity in blood (p = 0.006). No time-by-treatment interactions were found. DOMS on Pressure, Extension angle and myoglobin concentration in blood did not differ between the groups. This combination of a warm-up, stretching and massage reduces some negative effects of eccentric exercise, but the results are inconsistent, since some parameters were significantly affected by the treatment whereas others were not, despite the expected efficacy of a combination of treatments. The objective measures did not yield more unequivocal results than the subjective DOMS scores.
J B Rodenburg - One of the best experts on this subject based on the ideXlab platform.
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warm up stretching and massage diminish harmful effects of eccentric exercise
International Journal of Sports Medicine, 1994Co-Authors: J B Rodenburg, D Steenbeek, P Schiereck, P R BarAbstract:The effect of a combination of a warm-up, stretching exercises and massage on subjective scores for delayed onset muscle soreness (DOMS) and objective functional and biochemical measures was studied. Fifty people, randomly divided in a treatment and a control group, performed eccentric exercise with the forearm flexors for 30 min. The treatment group additionally performed a warm-up and underwent a stretching protocol before the eccentric exercise and massage afterwards. Functional and biochemical measures were obtained before, and 1, 24, 48, 72 and 96h after exercise. The median values at the five post-exercise time points differed significantly for DOMS measured when the arm was extended (p = 0.043). Significant main effects for treatment were found on the maximal force (p = 0.026), the flexion angle of the elbow (p = 0.014) and the creatine kinase activity in blood (p = 0.006). No time-by-treatment interactions were found. DOMS on Pressure, Extension angle and myoglobin concentration in blood did not differ between the groups. This combination of a warm-up, stretching and massage reduces some negative effects of eccentric exercise, but the results are inconsistent, since some parameters were significantly affected by the treatment whereas others were not, despite the expected efficacy of a combination of treatments. The objective measures did not yield more unequivocal results than the subjective DOMS scores.
D Steenbeek - One of the best experts on this subject based on the ideXlab platform.
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warm up stretching and massage diminish harmful effects of eccentric exercise
International Journal of Sports Medicine, 1994Co-Authors: J B Rodenburg, D Steenbeek, P Schiereck, P R BarAbstract:The effect of a combination of a warm-up, stretching exercises and massage on subjective scores for delayed onset muscle soreness (DOMS) and objective functional and biochemical measures was studied. Fifty people, randomly divided in a treatment and a control group, performed eccentric exercise with the forearm flexors for 30 min. The treatment group additionally performed a warm-up and underwent a stretching protocol before the eccentric exercise and massage afterwards. Functional and biochemical measures were obtained before, and 1, 24, 48, 72 and 96h after exercise. The median values at the five post-exercise time points differed significantly for DOMS measured when the arm was extended (p = 0.043). Significant main effects for treatment were found on the maximal force (p = 0.026), the flexion angle of the elbow (p = 0.014) and the creatine kinase activity in blood (p = 0.006). No time-by-treatment interactions were found. DOMS on Pressure, Extension angle and myoglobin concentration in blood did not differ between the groups. This combination of a warm-up, stretching and massage reduces some negative effects of eccentric exercise, but the results are inconsistent, since some parameters were significantly affected by the treatment whereas others were not, despite the expected efficacy of a combination of treatments. The objective measures did not yield more unequivocal results than the subjective DOMS scores.
P Schiereck - One of the best experts on this subject based on the ideXlab platform.
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warm up stretching and massage diminish harmful effects of eccentric exercise
International Journal of Sports Medicine, 1994Co-Authors: J B Rodenburg, D Steenbeek, P Schiereck, P R BarAbstract:The effect of a combination of a warm-up, stretching exercises and massage on subjective scores for delayed onset muscle soreness (DOMS) and objective functional and biochemical measures was studied. Fifty people, randomly divided in a treatment and a control group, performed eccentric exercise with the forearm flexors for 30 min. The treatment group additionally performed a warm-up and underwent a stretching protocol before the eccentric exercise and massage afterwards. Functional and biochemical measures were obtained before, and 1, 24, 48, 72 and 96h after exercise. The median values at the five post-exercise time points differed significantly for DOMS measured when the arm was extended (p = 0.043). Significant main effects for treatment were found on the maximal force (p = 0.026), the flexion angle of the elbow (p = 0.014) and the creatine kinase activity in blood (p = 0.006). No time-by-treatment interactions were found. DOMS on Pressure, Extension angle and myoglobin concentration in blood did not differ between the groups. This combination of a warm-up, stretching and massage reduces some negative effects of eccentric exercise, but the results are inconsistent, since some parameters were significantly affected by the treatment whereas others were not, despite the expected efficacy of a combination of treatments. The objective measures did not yield more unequivocal results than the subjective DOMS scores.
Muhammad Ali Almarhoun - One of the best experts on this subject based on the ideXlab platform.
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adjustment of differential liberation data to separator conditions
SPE middle east oil show, 2001Co-Authors: Muhammad Ali AlmarhounAbstract:Muhammad A. Al-Marhoun, SPE, King Fahd U. of Petroleum and MineralsSummarySolution gas/oil ratio (GOR) and oil formation volume factor(FVF) are normally obtained from differential or flash liberationtests. However, neither the differential liberation process nor theflash liberation process can represent the fluid flow in petroleumreservoirs. Therefore, data obtained from any of the two test pro-cedures must be adjusted to approximate the fluid behavior in thereservoir. At low Pressures, the conventional method of adjustmentyields negative values of solution GOR and values of oil FVF ofless than 1. This, of course, is not physically correct.This paper presents a new method for adjusting the differentialliberation data to separator conditions. The new method overcomesthe limitations of the conventional adjustment method and makesthe low-Pressure Extension of the curves of solution GOR and oilFVF more accurate. The method is based on the fact that dataobtained from both the differential and flash liberation tests shouldyield the same value of oil relative density at reservoir conditions.The new method is tested using 425 PVT files, yielding results thatare consistent with the physical behavior of solution GOR and oil FVF.IntroductionIn the differential liberation process, gas is removed as it is re-leased from the oil. In the flash liberation process, however, theliberated gas is not removed and is allowed to reach equilibriumwith the oil.Generally, petroleum engineers consider that the gas liberationprocess in the reservoir can be represented by the differential lib-eration process.