Medicine and science in sports最新文献_第2页

Kinematic analysis of the open and square stance tennis forehand 网球正手开、方站的运动学分析

Medicine and science in sports Pub Date : 1998-01-22 DOI: 10.1097/00005768-199805001-00165

R. Bahamonde, D. Knudson

引用次数: 22

Cognitive performance and mood during 90 min of discontinuous exercise in males and females 不连续运动90分钟时男女的认知表现和情绪

Medicine and science in sports Pub Date : 1995-02-10 DOI: 10.1249/00005768-199505001-00855

G. Kamimori, J. Milani, T. Balkin, D. Thorne, S. Y. Wu, H. Q. Davis

引用次数: 1

Effect of stride length variation on oxygen uptake during level and positive grade treadmill running 步长变化对水平级和正级跑步机摄氧量的影响

Medicine and science in sports Pub Date : 1986-04-01 DOI: 10.1249/00005768-198604001-00185

L. Heinert, R. Serfass, G. Stull

引用次数: 19

The effect of beta-blockade in ski-jumpers. -阻滞剂对滑雪运动员的影响。

Medicine and science in sports Pub Date : 1979-10-01 DOI: 10.1249/00005768-197901130-00008

T. Videman, T. Sonck, J. Jänne

引用次数: 17

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 : 1979-10-01 DOI: 10.1249/00005768-197901130-00014

N. Calvano, R. E. Berger

{"title":"Effects of selected test variables on the evaluation of football helmet performance.","authors":"N. Calvano, R. E. Berger","doi":"10.1249/00005768-197901130-00014","DOIUrl":"https://doi.org/10.1249/00005768-197901130-00014","url":null,"abstract":"The most important variables in helmet test methods (headform, impact surface, velocity) were studied by systematically changing the test variables and measuring the effect of these changes on the output responses (peak acceleration and severity index) of helmeted headforms. The degree of correlation between variables was also measured. The metal headform yielded consistently higher results than the humanoid headform but the differences between the two were much greater during impacts at the back site. Also, correlation between humanoid and metal headforms was significantly higher for top impacts than for rear impacts. These discrepancies between top and rear impacts were attributed to difficulties in the neck mounting system with the humanoid headform which causes inordinate bending during impacts. The soft impact surface yielded lower responses than the hard surface for both headforms, correlations between soft and hard surfaces were high in all cases. A small change in impact velocity (4.5 to 5 m/sec) resulted in a substantially higher output response. Correlation between velocities were much lower for the back impact site than the top.","PeriodicalId":18528,"journal":{"name":"Medicine and science in sports","volume":"40 1","pages":"293-301"},"PeriodicalIF":0.0,"publicationDate":"1979-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89950135","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: 8

The energy cost of cross-country skiing among elite competitors. 精英选手越野滑雪的能量消耗。

Medicine and science in sports Pub Date : 1979-10-01 DOI: 10.1249/00005768-197901130-00009

J. Macdougall, R. Hughson, J. Sutton, J. R. Moroz

引用次数: 62

Physiological characteristics of trained Australian paraplegic and tetraplegic subjects 受过训练的澳大利亚截瘫和四肢瘫痪受试者的生理特征

Medicine and science in sports Pub Date : 1979-10-01 DOI: 10.1249/00005768-197901130-00006

Gass Gc, Campbell Em

引用次数: 69

A mathematical model of hiking positions in a sailing dinghy. 帆船上徒步行走位置的数学模型。

Medicine and science in sports Pub Date : 1979-10-01 DOI: 10.1249/00005768-197901130-00013

Putnam Ca

引用次数: 22

Urinary cyclic AMP and cyclic GMP in normal and asthmatic subjects during exercise. 正常和哮喘受试者运动时尿循环AMP和循环GMP的变化。

Medicine and science in sports Pub Date : 1979-10-01 DOI: 10.1249/00005768-197901130-00005

H. Linklater, K. P. Strickland, D. Cunningham, J. Griffiths, J. Trevithick

{"title":"Urinary cyclic AMP and cyclic GMP in normal and asthmatic subjects during exercise.","authors":"H. Linklater, K. P. Strickland, D. Cunningham, J. Griffiths, J. Trevithick","doi":"10.1249/00005768-197901130-00005","DOIUrl":"https://doi.org/10.1249/00005768-197901130-00005","url":null,"abstract":"The purpose of this study was to compare exercise-induced changes in urinary cyclic AMP and cyclic GMP of normal and asthmatic subjects. All subjects were exercised to 80% of predicted maximum heart rate for 15 minutes on a bicycle ergometer. FEV1 was measured before and after exercise to determine the degree of bronchoconstriction due to exercise. Five urine specimens were collected by voluntary voiding at 20 minute intervals (one specimen before exercise and four after exercise). Before exercise, the asthmatic subjects excreted less cyclic GMP (p less than 0.05) but the same cyclic AMP as the normal subjects. Creatinine excretion in nine asthmatic subjects decreased by 24% (p less than 0.01) during exercise. In sixteen normal subjects (post-exercise bronchoconstriction less than 10%) cyclic AMP excretion increased by 19% (p less than 0.05) within 20 minutes after exercise, while cyclic GMP excretion did not change significantly. In thirteen asthmatic subjects (post-exercise bronchoconstriction greater than 20%) cyclic AMP excretion did not change significantly, while cyclic GMP excretion increased by 23% (p less than 0.05) within 20 minutes after exercise. This study has shown that exercise affects the excretion of cyclic AMP, cyclic GMP, and creatinine in normal and asthmatic subjects. The response of normal and asthmatic groups to exercise was the same for creatinine but different for cyclic AMP and cyclic GMP.","PeriodicalId":18528,"journal":{"name":"Medicine and science in sports","volume":"9 1","pages":"250-5"},"PeriodicalIF":0.0,"publicationDate":"1979-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90272733","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: 2

Growth hormone response to continuous and intermittent exercise. 生长激素对连续和间歇运动的反应。

Medicine and science in sports Pub Date : 1979-10-01 DOI: 10.1249/00005768-197901130-00015

A. Karagiorgos, J. Garcia, G. Brooks

{"title":"Growth hormone response to continuous and intermittent exercise.","authors":"A. Karagiorgos, J. Garcia, G. Brooks","doi":"10.1249/00005768-197901130-00015","DOIUrl":"https://doi.org/10.1249/00005768-197901130-00015","url":null,"abstract":"We tested the hypothesis that human growth hormone (hGH) secretion during exercise is related to anaerobic metabolism, and therefore blood lactic acid (LA). Ten males (20 to 30 years) were observed during 40 min of continuous cycle ergometer exercise (CE, 45% of the minimum load which elicited VO2max), and during 20 bouts of intermittent exercise (IE, 1 min on/off at 2x the CE work rate). Continuous and intermittent exercises were used as these are known to result in different LA responses. Resting hGH was 1 to 2 ng/ml. After a lag period, hGH was significantly elevated by 15 min of exercise and thereafter rose continuously in both IE and CE. During IE hGH tended to be higher (12.1 +/- 1.4) than during CE (9.7 +/- 1.6 ng/ml, X +/- SEM), but the difference was not significant. In both exercise conditions free fatty acids demonstrated an initial fall and then a continuous secondary rise with higher peak values during CE (0.52 +/- .06) THAN DURING IE (0.39 +/- .05 mEq/l). Pyruvate (PY) and lactate rose initially during CE, but then declined before reaching steady levels. During IE, LA and PY increased continuously reaching values 3x greater than during CE. Alanine rose progressively during CE and IE, but was significantly higher during IE (442.2 +/- 29.3 vs. 367.9 +/- 30.9 muM). Glucose also tended to be higher during IE (4.67 +/- 0.32) than during CE (4.25 +/- 0.28 mM). Considering CE and IE either together or separately, no physiologically significant correlation was found between hGH and metabolite concentrations, rectal T, or O2 deficit. The results are interpreted to mean that hGH response to work is not directly related to \"anaerobiosis\".","PeriodicalId":18528,"journal":{"name":"Medicine and science in sports","volume":"45 1","pages":"302-7"},"PeriodicalIF":0.0,"publicationDate":"1979-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83075552","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: 67