Pub Date : 2005-05-01DOI: 10.1097/00005768-200505001-00882
R. Scott, C. Moran, R. Wilson, V. Onywera, M. Boit, W. Goodwin, H. Montgomery, Y. Pitsiladis
{"title":"ACE Genotype Is Not Associated With Elite Endurance Athlete Status In Kenyans","authors":"R. Scott, C. Moran, R. Wilson, V. Onywera, M. Boit, W. Goodwin, H. Montgomery, Y. Pitsiladis","doi":"10.1097/00005768-200505001-00882","DOIUrl":"https://doi.org/10.1097/00005768-200505001-00882","url":null,"abstract":"","PeriodicalId":18528,"journal":{"name":"Medicine and science in sports","volume":"20 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2005-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79230703","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}
Pub Date : 2004-12-01DOI: 10.1249/00005768-200605001-02019
Julie Erskine, I. Smillie, J. Leiper, D. Ball, M. Cardinale
The purpose of this study was to compare the neuromuscular and hormonal responses following a single session of isometric half-squat exercise with and without the superimposition of whole body vibrations (WBV). Seven healthy males performed ten sets of one minute, with one minute rest between sets, of isometric exercise in half-squat position. This was conducted on two separate occasions, either with WBV (30 Hz; 3.5 g) or no vibration (Control). Maximal isometric unilateral knee extensions with doublet superimposed via percutaneous electrical stimulation were performed before and immediately following WBV and Control treatments. Significant decreases in maximal voluntary contraction were observed following both WBV and Control. Rate of torque development in the first 200 ms (RTD200ms). salivary testosterone (T) and cortisol (C) concentrations, and voluntary activation were unaffected. However, RTD 200ms and T concentration tended to be lower following WBV only. The results of this study suggest that this acute WBV protocol does not greatly affect the neuroendocrine system, but does cause a low level of fatigue, most likely attributed to peripheral rather than central mechanisms.
{"title":"Neuromuscular and Hormonal Effects of a Single Session of Whole Body Vibration Exercise","authors":"Julie Erskine, I. Smillie, J. Leiper, D. Ball, M. Cardinale","doi":"10.1249/00005768-200605001-02019","DOIUrl":"https://doi.org/10.1249/00005768-200605001-02019","url":null,"abstract":"The purpose of this study was to compare the neuromuscular and hormonal responses following a single session of isometric half-squat exercise with and without the superimposition of whole body vibrations (WBV). Seven healthy males performed ten sets of one minute, with one minute rest between sets, of isometric exercise in half-squat position. This was conducted on two separate occasions, either with WBV (30 Hz; 3.5 g) or no vibration (Control). Maximal isometric unilateral knee extensions with doublet superimposed via percutaneous electrical stimulation were performed before and immediately following WBV and Control treatments. Significant decreases in maximal voluntary contraction were observed following both WBV and Control. Rate of torque development in the first 200 ms (RTD200ms). salivary testosterone (T) and cortisol (C) concentrations, and voluntary activation were unaffected. However, RTD 200ms and T concentration tended to be lower following WBV only. The results of this study suggest that this acute WBV protocol does not greatly affect the neuroendocrine system, but does cause a low level of fatigue, most likely attributed to peripheral rather than central mechanisms.","PeriodicalId":18528,"journal":{"name":"Medicine and science in sports","volume":"149 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2004-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84798639","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}
Pub Date : 2003-05-01DOI: 10.1097/00005768-200305001-02065
D. Carl, E. Bales, C. Haubrich, M. Kirschling, C. Milnes, A. Vernon, J. Winquist
{"title":"Effect of high intensity versus high volume swim training on selected measures of fatigue","authors":"D. Carl, E. Bales, C. Haubrich, M. Kirschling, C. Milnes, A. Vernon, J. Winquist","doi":"10.1097/00005768-200305001-02065","DOIUrl":"https://doi.org/10.1097/00005768-200305001-02065","url":null,"abstract":"","PeriodicalId":18528,"journal":{"name":"Medicine and science in sports","volume":"29 2 1","pages":"371"},"PeriodicalIF":0.0,"publicationDate":"2003-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77995824","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}
Pub Date : 2003-05-01DOI: 10.1097/00005768-200305001-01663
C. L. Petteys, C. Foster, G. Brice, S. Doberstein, J. Porcari
Eight male and female students were studied during exercise to exhaustion on a bicycle ergometer at 80 and 100% of Vo2max following the ingestion of water (W), 75 g of glucose (G) or a liquid meal (M) (10 g protein, 12.5 g fat, 15 g CHO). When compared to the endurance ride (80% Vo2max) in the W treatment, endurance performance time was reduced by 19%, (p less than .05) (53.2 to 43.2 min) as a result of the preexercise glucose feeding (Trial G). No difference in performance at 80% Vo2max was found between the W and M trials. The preexercise feedings had no effect on exercise time to exhaustion at 100% Vo2max. During the G and M trials at 80% Vo2max, most of the subjects demonstrated a transient decline in serum glucose (less than 3.5 mM). After 30-40 min. of exercise, however, serum glucose returned to normal and was seldom low at the time of exhaustion. Serum free fatty acids (FFA) were depressed throughout the G trial. The results of these experiments indicate impaired lipid mobilization following CHO ingestion. The present data support our earlier findings (11) which demonstrate that glucose feedings 30-45 minutes before endurance exercise increase the rate of CHO oxidation and impede the mobilization of FFA, thereby reducing exercise time to exhaustion.
{"title":"Effects of preexercise feedings on endurance performance.","authors":"C. L. Petteys, C. Foster, G. Brice, S. Doberstein, J. Porcari","doi":"10.1097/00005768-200305001-01663","DOIUrl":"https://doi.org/10.1097/00005768-200305001-01663","url":null,"abstract":"Eight male and female students were studied during exercise to exhaustion on a bicycle ergometer at 80 and 100% of Vo2max following the ingestion of water (W), 75 g of glucose (G) or a liquid meal (M) (10 g protein, 12.5 g fat, 15 g CHO). When compared to the endurance ride (80% Vo2max) in the W treatment, endurance performance time was reduced by 19%, (p less than .05) (53.2 to 43.2 min) as a result of the preexercise glucose feeding (Trial G). No difference in performance at 80% Vo2max was found between the W and M trials. The preexercise feedings had no effect on exercise time to exhaustion at 100% Vo2max. During the G and M trials at 80% Vo2max, most of the subjects demonstrated a transient decline in serum glucose (less than 3.5 mM). After 30-40 min. of exercise, however, serum glucose returned to normal and was seldom low at the time of exhaustion. Serum free fatty acids (FFA) were depressed throughout the G trial. The results of these experiments indicate impaired lipid mobilization following CHO ingestion. The present data support our earlier findings (11) which demonstrate that glucose feedings 30-45 minutes before endurance exercise increase the rate of CHO oxidation and impede the mobilization of FFA, thereby reducing exercise time to exhaustion.","PeriodicalId":18528,"journal":{"name":"Medicine and science in sports","volume":"99 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2003-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80612652","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}
Pub Date : 2003-04-28DOI: 10.1097/00005768-200305001-01549
Kristen E. Gerlach, H. Burton, J. Dorn, J. Leddy, S. White, P. Horvath
{"title":"Fatigue, balance, running mechanics and flexibility as risk factors for injury among female runners","authors":"Kristen E. Gerlach, H. Burton, J. Dorn, J. Leddy, S. White, P. Horvath","doi":"10.1097/00005768-200305001-01549","DOIUrl":"https://doi.org/10.1097/00005768-200305001-01549","url":null,"abstract":"","PeriodicalId":18528,"journal":{"name":"Medicine and science in sports","volume":"1 1","pages":"279"},"PeriodicalIF":0.0,"publicationDate":"2003-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83140354","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}
Pub Date : 2003-01-01DOI: 10.1097/00005768-200305001-00064
L. Saxon, S. Iuliano‐Burns, G. Naughton, R. Daly, S. Bass
PURPOSE Before exercise prescription for bone health can be recommended, the relationship between mechanical loading characteristics and the skeletal response need to be quantified. We asked i) does moderate impact exercise result in a greater gain in BMC than low impact exercise, ii) what are the loading characteristics associated with a moderate and low impact exercise program and does this differ from non-structured play?, and iii) does loading history affect the osteogenic response to a moderate or low impact program? METHODS Sixty-eight pre- and early-pubertal girls (aged 8.9 +/- 0.2 yrs) were randomized to take part in a moderate or low impact exercise program 3 times/wk for 8.5 mnths. The number and type of loads associated with the exercise classes and non-structured play (recess) were assessed from video footage. The magnitude of load was assessed using a pedar in-sole mobile system. Hours of moderate and high impact organized sport were assessed from a physical activity questionnaire. RESULTS The moderate and low impact exercise programs consisted of -400 impacts per class, but the jumping, hopping and dynamic activities performed during the moderate impact program produced forces ranging from 2 to 4 times body weight (BW) compared to -1 BW for the low impact program. Moderate impact exercise resulted in a 2.7% greater gain in BMC at the tibia compared to the low impact exercise. The moderate impact exercise program consisted of fewer low impacts (1-2 BW) and a higher number of moderate impacts (2-4BW) compared to those typically performed during non-structured play. There were greater gains in BMC in subjects participating in the moderate versus the low impact exercise programs who participated in 2 to 3 hours of moderate impact sports outside school (2.5% to 4.5%, p CONCLUSION Approximately 400 impacts ranging 2-4 BW, 3 times/wk was enough stimuli to result in an osteogenic response in normally active girls; even in those actively involved in moderate impact sports outside school.
{"title":"Quantifying the relationship between mechanical loading and the skeletal response in pre- and early-pubertal girls","authors":"L. Saxon, S. Iuliano‐Burns, G. Naughton, R. Daly, S. Bass","doi":"10.1097/00005768-200305001-00064","DOIUrl":"https://doi.org/10.1097/00005768-200305001-00064","url":null,"abstract":"PURPOSE Before exercise prescription for bone health can be recommended, the relationship between mechanical loading characteristics and the skeletal response need to be quantified. We asked i) does moderate impact exercise result in a greater gain in BMC than low impact exercise, ii) what are the loading characteristics associated with a moderate and low impact exercise program and does this differ from non-structured play?, and iii) does loading history affect the osteogenic response to a moderate or low impact program? METHODS Sixty-eight pre- and early-pubertal girls (aged 8.9 +/- 0.2 yrs) were randomized to take part in a moderate or low impact exercise program 3 times/wk for 8.5 mnths. The number and type of loads associated with the exercise classes and non-structured play (recess) were assessed from video footage. The magnitude of load was assessed using a pedar in-sole mobile system. Hours of moderate and high impact organized sport were assessed from a physical activity questionnaire. RESULTS The moderate and low impact exercise programs consisted of -400 impacts per class, but the jumping, hopping and dynamic activities performed during the moderate impact program produced forces ranging from 2 to 4 times body weight (BW) compared to -1 BW for the low impact program. Moderate impact exercise resulted in a 2.7% greater gain in BMC at the tibia compared to the low impact exercise. The moderate impact exercise program consisted of fewer low impacts (1-2 BW) and a higher number of moderate impacts (2-4BW) compared to those typically performed during non-structured play. There were greater gains in BMC in subjects participating in the moderate versus the low impact exercise programs who participated in 2 to 3 hours of moderate impact sports outside school (2.5% to 4.5%, p CONCLUSION Approximately 400 impacts ranging 2-4 BW, 3 times/wk was enough stimuli to result in an osteogenic response in normally active girls; even in those actively involved in moderate impact sports outside school.","PeriodicalId":18528,"journal":{"name":"Medicine and science in sports","volume":"17 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2003-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79857072","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}
Pub Date : 2002-05-01DOI: 10.1097/00005768-200205001-00620
A. P. Heenan, L. A. Wolfe
{"title":"Effect of human pregancy on phase II ventilatory and gas exchange kinetics during moderate exercise","authors":"A. P. Heenan, L. A. Wolfe","doi":"10.1097/00005768-200205001-00620","DOIUrl":"https://doi.org/10.1097/00005768-200205001-00620","url":null,"abstract":"","PeriodicalId":18528,"journal":{"name":"Medicine and science in sports","volume":"46 1","pages":"111"},"PeriodicalIF":0.0,"publicationDate":"2002-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82124294","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}
Pub Date : 2002-05-01DOI: 10.1097/00005768-200205001-00863
B. Scheuermann, J. S. Williams, J. Gonzales, D. Roh, T. Barstow
{"title":"REPEATED BOUTS OF FAST RAMP EXERCISE ARE NOT ASSOCIATED WITH CHANGES IN THE VO2-WORK RATE SLOPE","authors":"B. Scheuermann, J. S. Williams, J. Gonzales, D. Roh, T. Barstow","doi":"10.1097/00005768-200205001-00863","DOIUrl":"https://doi.org/10.1097/00005768-200205001-00863","url":null,"abstract":"","PeriodicalId":18528,"journal":{"name":"Medicine and science in sports","volume":"5 1","pages":"154"},"PeriodicalIF":0.0,"publicationDate":"2002-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83353271","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}
Pub Date : 2001-04-16DOI: 10.1097/00005768-200105001-00928
J. NicodemusK., R. Hagan, J. S. Zue, C. Baker
{"title":"Supplementation with Cordyceps Cs-4 fermentation product promotes fat metabolism during prolonged exercise","authors":"J. NicodemusK., R. Hagan, J. S. Zue, C. Baker","doi":"10.1097/00005768-200105001-00928","DOIUrl":"https://doi.org/10.1097/00005768-200105001-00928","url":null,"abstract":"","PeriodicalId":18528,"journal":{"name":"Medicine and science in sports","volume":"1 1","pages":"164"},"PeriodicalIF":0.0,"publicationDate":"2001-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90270963","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}
Pub Date : 1999-05-01DOI: 10.1097/00005768-199905001-00691
R. Richey, R. Zabik, M. Dawson
{"title":"Effect of bicycle spinning on heart rate, oxygen consumption, respiratory exchange ratio, and caloric expenditure","authors":"R. Richey, R. Zabik, M. Dawson","doi":"10.1097/00005768-199905001-00691","DOIUrl":"https://doi.org/10.1097/00005768-199905001-00691","url":null,"abstract":"","PeriodicalId":18528,"journal":{"name":"Medicine and science in sports","volume":"27 1","pages":"160"},"PeriodicalIF":0.0,"publicationDate":"1999-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74072755","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：