Medicine and science in sports最新文献_第5页

Thermal and circulatory responses to repeated bouts of prolonged running. 反复长时间跑步的热循环反应。

Medicine and science in sports Pub Date : 1979-01-01

M N Sawka, R G Knowlton, J B Critz

引用次数: 0

Exercise responses in post myocardial infarction patients. 心肌梗死后患者的运动反应。

Medicine and science in sports Pub Date : 1979-01-01 DOI: 10.1249/00005768-197901140-00013

J. Sutton

引用次数: 1

Compliance of post myocardial infarction patients to exercise programs. 心肌梗死后患者对运动计划的依从性。

Medicine and science in sports Pub Date : 1979-01-01 DOI: 10.1249/00005768-197901140-00015

N. Oldridge

引用次数: 56

Proteinuria in the exercising dog. 运动犬的蛋白尿。

Medicine and science in sports Pub Date : 1979-01-01 DOI: 10.1249/00005768-197901140-00007

J. Epstein, E. Zambraski

{"title":"Proteinuria in the exercising dog.","authors":"J. Epstein, E. Zambraski","doi":"10.1249/00005768-197901140-00007","DOIUrl":"https://doi.org/10.1249/00005768-197901140-00007","url":null,"abstract":"Exercise proteinuria is a transient condition often observed following heavy exercise in man. A general belief is that exercise proteinuria in man is partially due to the decline in renal blood flow (RBF) associated with exercise. The purpose of this study was to determine if exercise proteinuria occurs in the dog, an animal whose RBF is constant during exercise. Chronic bladder cannulas were surgically implanted in four female mongrel dogs. Urine from both kidneys was collected prior to, during, and after heavy treadmill exercise (30 minutes duration, 5mph, and 15% grade). Urine protein concentration was determined by the biuret method. When compared to resting control urine, protein concentration during exercise increased by 47 percent (P less than .01). Urine flow rate at rest, .17 +/- .02 ml/min, decreased to .09 +/- .01 ml/min (P less than .01) during exercise, resulting in a small but not statistically significant decline in protein excretion. In twenty-six tests, when comparisons were made between resting and post-exercise periods, urine flow rate was identical, urine protein concentration was significantly highently elevated (P less than .01). These data indicate that exercise proteinuria may occur in the absence of changes in RBF.","PeriodicalId":18528,"journal":{"name":"Medicine and science in sports","volume":"14 1","pages":"348-50"},"PeriodicalIF":0.0,"publicationDate":"1979-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82138550","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 13

Muscle fiber composition and performance capacities of women. 女性肌肉纤维组成与运动能力。

Medicine and science in sports Pub Date : 1979-01-01

C J Campbell, A Bonen, R L Kirby, A N Belcastro

{"title":"Muscle fiber composition and performance capacities of women.","authors":"C J Campbell, A Bonen, R L Kirby, A N Belcastro","doi":"","DOIUrl":"","url":null,"abstract":"The purpose of the present study was to determine whether the fast-twitch (FT) fiber composition in muscle was a) correlated with performance capacities, b) related to the trainability of the subjects, and c) whether the FT fiber composition could be predicted with standard laboratory tests. From twenty-four young women (ages 24.3 +/- 3.0 yrs) muscle biopsies were obtained from the vastus lateralis of both the left and right legs. In addition, each subject completed four laboratory tests: i) a maximal oxygen intake test on the cycle ergometer, ii) a high-kp power test, iii) a low-kp power test, and iv) a Sargent jump. Prior to training the correlations between %FT fibers and each of the tests (r equal to or less than 0.19) were not significant (P less than 0.05). After training anaerobically (N = 20) significant improvements (P less than 0.05) occurred in a) the high-kp test (delta = + 0.12 +/- 0.02 kpm/sec.kg) b) the low-kp test (delta = + 0.10 +/- 0.01 kpm/sec.kg) and c) the Sargent jump (delta = + 2.5 +/- 1.1 cm). However, these training-induced changes (delta) were not correlated with %FT fiber composition (r equal to or less than 0.35), nor were the post-training performances on the tests correlated with the %FT fibers (r equal to or less than 0.12). Performance capacities before and after training were not significantly different in groups with a low %FT fiber composition (35.8 +/- 1.6%) or a high %FT fiber composition (63.6 +/- 2.2%). None of the performance tests either singly, or in combination in a multiple regression equation, provided a suitable prediction of the FT muscle fiber composition. The results of this study indicate that athletic performances and/or susceptibility for training cannot be determined a priori from simple measurements of muscle fiber composition.","PeriodicalId":18528,"journal":{"name":"Medicine and science in sports","volume":"11 3","pages":"260-5"},"PeriodicalIF":0.0,"publicationDate":"1979-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11726310","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Reduced heart rate response to exercise in ischemic heart disease: the fallacy of the target heart rate in exercise testing. 缺血性心脏病运动降低心率反应:运动试验中目标心率的谬误。

Medicine and science in sports Pub Date : 1979-01-01

A C Powles, J R Sutton, J R Wicks, N B Oldridge, N L Jones

{"title":"Reduced heart rate response to exercise in ischemic heart disease: the fallacy of the target heart rate in exercise testing.","authors":"A C Powles, J R Sutton, J R Wicks, N B Oldridge, N L Jones","doi":"","DOIUrl":"","url":null,"abstract":"When exercise testing 159 patients with prior myocardial infarction, we identified 39 who were limited by fatigue. This group was all in sinus rhythm; none were taking drugs likely to impair the chronotropic response of the heart; none experienced chest pain or developed ischemic ECG changes. In 18 of this group, maximal heart rate achieved with exercise was 2SD or more below the age predicted value, and their heart rate response to exercise was reduced compared to that of the other 21 whose maximal exercise heart rates were within 2SD of age predicted values. A subgroup of 8 subjects with reduced exercise heart rates was studied before and after vagal blockade. In the 4 subjects whose infarction was inferior, the reduction in heart rate response was more profound and persisted after vagal blockade, suggesting either reduced pacemaker responsivness, due to ischemia or infarction, or autonomic imbalance as possible mechanisms. All 8 showed alinear increases in ventilation at higher power outputs and mean blood lactate postexercise was 7.5 mM/I without vagal blockade. Our findings suggest that a reduced heart rate response to exercise, already shown to imply added coronary risk, may be subdivided aetiologically and possibly prognostically. The use of a \"Target Heart Rate\" in such patients offers no safety margin, and maximal exercise capacity will be grossly over-estimated if extrapolated from the submaximal heart rate response. A cardiovascular limitation to exercise may be detected by an alinear increase in ventilation.","PeriodicalId":18528,"journal":{"name":"Medicine and science in sports","volume":"11 3","pages":"227-33"},"PeriodicalIF":0.0,"publicationDate":"1979-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11726473","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Cardiac output during rest and exercise in desert heat. 沙漠高温下休息和运动时的心输出量。

Medicine and science in sports Pub Date : 1979-01-01

L G Myhre, I Oddershede, D B Dill, M K Yousef

引用次数: 0

Effects of selected test variables on the evaluation of football helmet performance. 所选试验变量对足球头盔性能评价的影响。

Medicine and science in sports Pub Date : 1979-01-01

N J Calvano, R E Berger

引用次数: 0

Muscle fatigue. 肌肉疲劳。

Medicine and science in sports Pub Date : 1979-01-01

E Asmussen