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11.
男子短跑300m不同强度跑中血乳酸、血尿素、尿蛋白变化的实验研究 总被引：4，自引：1，他引：3
对男子400m短跑运动员采用300m不同负荷跑的血乳酸、血尿素、尿蛋白变化进行了实验研究,发现相同距离,不同的负荷量和强度对人的机体产生的影响不同,训练的效果、达到的训练目的也不相同。建议训练应根据需要有目的地选择负荷量和强度。 相似文献
12.
以Wistar雄性大鼠为研究对象,探讨不同运动方式对同龄大鼠代谢终产物乳酸（lactic acid）和血清乳酸脱氢酶（lactate dehydrogenase,LDH）、肌酸激酶（creatine kinase,CK）的影响。结果：经过8周的跑台运动训练后,与对照组相比,无氧、有氧训练组大鼠血乳酸水平出现非常显著性差异（P〈0.01）,无氧组的LDH活性值显著升高（P〈0.01）,而有氧组没有显著性差异;无氧训练组组内第8周与静息值相比出现非常显著性差异（P〈0.01）,而有氧训练组组内LDH活性始终无明显变化。经过8周的训练,无氧组大鼠血清中肌酸激酶的活性有了很大提高（P〈0.01）,组间组内均具有显著性差异;有氧组肌酸激酶的活性也有了一定的提高,但较无氧组变化较小;对照组几乎无明显变化。结论：经过8周的跑台训练后,两种训练方式均有效提高了大鼠的血乳酸水平。不同方式的跑台运动训练后,大鼠血清乳酸脱氢酶的活性变化出现在无氧组中,显示无氧组的运动强度更能刺激大鼠血清LDH水平。两个训练组大鼠血清CK值,横向组间比较和纵向组内对比均出现显著性变化,表明大鼠血清CK值对运动负荷量比较敏感;无氧组横向组间比较和纵向组内对比,均比有氧组有更显著的变化,表明大鼠血清CK值能够反映运动负荷强度的变化。 相似文献
13.
Uday Kumar Anand Sharan Shaheena Kamal 《Indian journal of clinical biochemistry : IJCB》2003,18(2):6-7
Usually CPK, CK-MB and lactate dehydrogenase (LDH) enzymes are measured in blood during the period of myocardial infarction.
The changes in LDH assay indicates duration of the infarction.
The level of lactate dehydrogenase is 500 times greater in tissue than those found in serum. A small mass of damaged tissue
causes leakage of enzyme and increases its level in serum.
Any cause of tissue break down/hemolysis which is sufficiently severe can produce LDH pattern similar to that in myocardial
infarction.
We report this case of small bowel volvulus showing significant increase in LDH.
It may be due to tissue necrosis which increases the level of LDH in serum. 相似文献
14.
Michael Leveritt Helen MacLaughlin Peter J. Abernethy 《Journal of sports sciences》2013,31(11):865-871
The aim of this study was to determine the effects of a single bout of endurance exercise on subsequent strength performance. Eight males with a long history of resistance training performed isokinetic, isometric and isotonic leg extension strength tests 8 and 32 h after 50 min of cycle ergometry at 70-110% of critical power. The participants also completed a control condition in which no cycling was performed. Plasma lactate and ammonia were measured before and immediately after each strength test. Isokinetic, isometric and isotonic leg extension torques were not significantly different 8 or 32 h after endurance exercise compared with the control condition ( P > 0.05). A large (50.3%), but not statistically significant, increase in plasma ammonia was evident during the strength tests performed 8 h after endurance exercise, while a significant ( P ? 0.05) increase in ammonia was also seen 32 h after endurance exercise. No significant changes in plasma ammonia were evident in the control condition. Our results suggest that leg extension strength was not compromised by an earlier bout of endurance cycling. However, metabolic activity during the strength tests might have been altered by the preceding bout of endurance exercise. 相似文献
15.
Johnny Nilsson Sandor Csergö Lennart Gullstrand Per Tveit Per Egil Refsnes 《Journal of sports sciences》2013,31(11):939-945
The aim of this study was to examine work-time profiles, blood lactate concentrations and perceived exertion among Greco-Roman wrestlers in the 1998 World Championship. Forty-two senior wrestlers from nine nations were studied in 94 matches. Each match was recorded with a video camera (Panasonic AG 455, film rate: 25 Hz) and analysed for duration of work (wrestling) and rest (interrupt) periods. Blood lactate concentration was determined with an electrochemical device (Analox P-LM5) and a rating of perceived exertion scale (Borg) was used to estimate general exertion and exertion in the extremity and trunk muscles. The mean duration of the matches was 427 s (range 324-535 s), with mean durations of work and rest of 317 and 110 s, respectively. The mean periods of work and rest were 37.2 and 13.8 s, respectively. Mean blood lactate concentration was 14.8 mmol · l -1 (range 6.9-20.6). The difference in mean blood lactate concentration between the first- and final-round matches was not significant ( P > 0.05). Blood lactate concentration was significantly higher ( P ? 0.04) in matches of long duration than in those of short duration. The mean general rating of perceived exertion for all matches was 13.8 according to the scale used. Most of the wrestlers (53.3%) perceived exertion to be highest in the flexors of the forearm, followed by the deltoids (17.4%) and the biceps brachii muscles (12.0%). In addition to a relatively high rating of perceived exertion in the arm muscles, this indicates a high specific load on the flexor muscles of the forearm. 相似文献
16.
It has previously been shown that measurement of the critical speed is a non-invasive method of estimating the blood lactate response during exercise. However, its validity in children has yet to be demonstrated. The aims of this study were: (1) to verify if the critical speed determined in accordance with the protocol of Wakayoshi et al. is a non-invasive means of estimating the swimming speed equivalent to a blood lactate concentration of 4 mmol·l-1 in children aged 10-12 years; and (2) to establish whether standard of performance has an effect on its determination. Sixteen swimmers were divided into two groups: beginners and trained. They initially completed a protocol for determination of speed equivalent to a blood lactate concentration of 4 mmol·l-1. Later, during training sessions, maximum efforts were swum over distances of 50, 100 and 200 m for the calculation of the critical speed. The speeds equivalent to a blood lactate concentration of 4 mmol·l-1 (beginners = 0.82±0.09 m·s-1 , trained = 1.19±0.11 m·s-1; mean±s) were significantly faster than the critical speeds (beginners = 0.78±0.25·s-1 , trained = 1.08±0.04 m·s-1) in both groups. There was a high correlation between speed at a blood lactate concentration of 4 mmol·l-1 and the critical speed for the beginners (r = 0.96, P ? 0.001), but not for the trained group (r = 0.60, P > 0.05). The blood lactate concentration corresponding to the critical speed was 2.7±1.1 and 3.1±0.4 mmol·l-1 for the beginners and trained group respectively. The percent difference between speed at a blood lactate concentration of 4 mmol·l-1 and the critical speed was not significantly different between the two groups. At all distances studied, swimming performance was significantly faster in the trained group. Our results suggest that the critical speed underestimates swimming intensity corresponding to a blood lactate concentration of 4 mmol·l-1 in children aged 10-12 years and that standard of performance does not affect the determination of the critical speed. 相似文献
17.
Riaz Ahmad Mumtaz Alam M. Faisal Siddiqui Absar-ul Hasnain 《Indian journal of clinical biochemistry : IJCB》2008,23(2):181-185
The adjustments and diagnostic significance of polyacrylamide gel electrophoretic (PAGE) profiles of lactate dehydrogenase
isoenzymes (LDH: 1.1.1.27) was evaluated in the sera and pleural fluid of patients with tubercular pyothorax. Sera and pleural
fluid samples were randomly collected from 72 and 18 patients respectively at two different timings; first, when patients
were admitted to the Hospital and second, after an intensive phase of treatment. Sera of 20 healthy individuals served as
control. Our results demonstrate significant differences in sera LDH (sLDH) and pleural fluid LDH (pfLDH) isoenzymes. In patients
the order of LDH isoenzyme in sera and pleural fluid followed: LDH−5>−4>−2>−3>−1 and LDH-5>−4>−3>−2>−1 respectively. The ranking
of activity levels in control was LDH−2>−1>−3>−5>−4. In the second phase of sampling from 31 patients, values of sLDH isoenzymes
showed recovery and resembled profiles of controls. Therefore, the sLDH zymograms of patients can be used as the prognostic
marker, since they tend to reach the normal level during recovery signifying the effect of chemotherapy in hospitalized patients.
Moreover, according to the present findings on LDH-PAGE profiles, the levels of LDH-5 and-4 rise in pyothorax patients significantly
(P<0.05). This elevation along with the rise in total LDH activity may, therefore, be used in the diagnosis and monitoring
of tubercular pyothorax. 相似文献
18.
血乳酸值与肌细胞酸性化关联因素对游泳无氧能力的影响 总被引：5，自引：0，他引：5
狄建 《西安体育学院学报》2002,19(1):46-48
游泳比赛及高强度计时训练时 ,人体骨骼肌大量生成并堆积乳酸导致肌纤维细胞pH值酸性化 ,使运动员陷入力竭性疲劳。这种由剧烈运动而造成的疲劳的性质是因为在缺氧条件下 ,骨骼肌细胞中由于乳酸分解所产生的H+升高而促成人体内环境电解质平衡的pH值下降的原因 ,正是由于人体内环境的H+水平的升高与pH值下降 ,才是导致力竭性疲劳的主要根源。本文尝试对影响血乳酸值的部分因素作一探讨 ,以期对游泳运动员无氧能力影响作用因素的评价方法有进一步认识。 相似文献
19.
血乳酸测定在游泳训练中的应用 总被引：1，自引：0，他引：1
血乳酸是目前游泳训练中应用较广泛的重要指标。本文较系统地简明地介绍了血乳酸在制定游泳训练方法、安排训练强度、评定训练效果及预测成绩等方面的研究和应用成果。对游泳训练有较大的实用价值。 相似文献
20.
Joseph L. Andreacci Linda M. Lemura Steven L. Cohen Ethan A. Urbansky Sara A. Chelland Serge P. von Duvillard 《Journal of sports sciences》2013,31(4):345-352
The aim of this study was to determine the effects of frequency of verbal encouragement during maximal exercise testing. Twenty-eight participants (12 males, 16 females) aged 20.9 - 1.5 years (mean - s ) performed a maximal exercise test ( V O 2max ) on a treadmill without any verbal encouragement. The participants were matched according to their pre-test V O 2max and placed into either a control group or one of three experimental groups. They performed a second exercise test (post-test) 1 week later. During the second test, the control group received no verbal encouragement; the 20 s (20E), 60 s (60E) and 180 s (180E) encouragement groups received verbal encouragement every 20, 60 and 180 s, respectively, beginning with stage 3 of the exercise test. Relative V O 2max , exercise time, blood lactate concentration, respiratory exchange ratio (RER) and ratings of perceived exertion (RPE) were not significantly different from the first test to the second test for the control group without verbal encouragement and the 180E group that received infrequent encouragement. Post-test values were significantly higher than pre-test values for the 20E and 60E groups. The post-test values of the 20E group were significantly higher than their pre-test values for relative V O 2max ( P ? 0.001), exercise time ( P ? 0.0001), blood lactate concentr . ation ( P ? 0.05), RER ( P ? 0.01) and RPE ( P ? 0.0001); this was also the case for the 60E group for relative V O 2max ( P ? 0.01), blood lactate concentration ( P ? 0.05), RER ( P ? 0.05) and RPE ( P ? 0.05). The results suggest that frequent verbal encouragement (every 20 s and 60 s in the present study) leads to significantly greater maximum effort in a treadmill test than when no encouragement is given or when the encouragement is infrequent (i.e. every 180 s). 相似文献