Australian journal of science and medicine in sport最新文献_第6页

Power spectrum of the fast Fourier transform for measurement of standing balance. 站立平衡测量的快速傅立叶变换功率谱。

Australian journal of science and medicine in sport Pub Date : 1995-09-01

S H Liu, D Lawson

{"title":"Power spectrum of the fast Fourier transform for measurement of standing balance.","authors":"S H Liu, D Lawson","doi":"","DOIUrl":"","url":null,"abstract":"Power spectrum of the force moment generated from the fast Fourier transform (FFT) was utilised to evaluate standing balance on a force platform. The principles on generating and analysing an FFT spectrum from the output of the force platform are illustrated. Test-retest reliability of twelve healthy young people (age = 26 +/- 4 years) was performed with the preferred leg stance. The intraclass correlation coefficient (ICC), R, of mean power (P), spectral area (Sx) and maximum power (Px) were 0.89, 0.85 and 0.89 respectively, indicating that the spectral parameters are reliable quantitative measures of balance. Pearson product moment (PPM), r, of these spectral parameters were 0.95, 0.85 and 0.95 respectively showing that these spectral parameters are significantly correlated (p < 0.01). A comparison was made with respect to the one legged stance and two legged stance steadiness. The one legged stance (Sx = 95.75 cm.Hz) was significantly less stable than the two legged stance (Sx = 41.58 cm.Hz) with a value of 9.37. Moreover, the one legged stance was highly correlated to the two legged stance (r = 0.84), indicating that, in general, a subject who has a stable one legged stance should have a stable two legged stance.","PeriodicalId":79393,"journal":{"name":"Australian journal of science and medicine in sport","volume":"27 3","pages":"62-7"},"PeriodicalIF":0.0,"publicationDate":"1995-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19580075","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

The impact of exercise deprivation on well-being of habitual exercises. 运动剥夺对习惯性运动幸福感的影响。

Australian journal of science and medicine in sport Pub Date : 1995-09-01

A Szabo

引用次数: 0

Effects of oral creatine loading on single and repeated maximal short sprints. 口服肌酸负荷对单次和多次最大短跑的影响。

Australian journal of science and medicine in sport Pub Date : 1995-09-01

B Dawson, M Cutler, A Moody, S Lawrence, C Goodman, N Randall

{"title":"Effects of oral creatine loading on single and repeated maximal short sprints.","authors":"B Dawson, M Cutler, A Moody, S Lawrence, C Goodman, N Randall","doi":"","DOIUrl":"","url":null,"abstract":"This investigation determined whether oral creatine (Cr) loading could enhance single and repeated short sprint performance. A 1 x 10 s cycle sprint (Study One) and 6 x 6 s (departing every 30 s) repeated cycle sprints (Study two) were the performance tests used. Separate groups of subjects, randomly assigned to either a Cr or placebo (P) group, were used in each study in a double blind design. After performing a familiarization and two baseline tests subjects loaded with 5g of Cr or P four times per day for five days before repeating the tests one and three days post-loading. In Study One (n = 9 in each group), work completed (kJ) at 2, 4, 6, 8 and 10 s and peak power (W) were greater than baseline values in each of the post-loading trials in both the Cr and P groups. There were no between group performance differences. In Study Two (n = 11 in each group) after loading, the Cr group recorded significantly greater scores than the P group in total work (kJ) completed over the 6 sprints, work completed in sprint 1, and peak power (W). Post-exercise blood lactate and pH responses were not different between the Cr and P groups after loading in either study. Although Study One results are equivocal, Study Two results suggest that Cr supplementation can enhance both single (if sprint 1 results are considered in isolation) and repeated short sprint performance.","PeriodicalId":79393,"journal":{"name":"Australian journal of science and medicine in sport","volume":"27 3","pages":"56-61"},"PeriodicalIF":0.0,"publicationDate":"1995-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19580074","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

The limits of the possible: models of power supply and demand in cycling. 可能性的限制:循环中的电力供应和需求模型。

Australian journal of science and medicine in sport Pub Date : 1995-06-01

T Olds, K Norton, N Craig, S Olive, E Lowe

{"title":"The limits of the possible: models of power supply and demand in cycling.","authors":"T Olds, K Norton, N Craig, S Olive, E Lowe","doi":"","DOIUrl":"","url":null,"abstract":"This paper outlines a general strategy for mathematical modeling of cycling performance. This strategy involves formulating one expression describing the power available for external work from physiological sources. The variables used in this expression include maximal aerobic power (VO2max), fractional utilisation of VO2max, mechanical efficiency, maximal accumulated oxygen deficit, and the time constants relating to the expression of aerobic and anaerobic capacities. A second expression describing the power demand of cycling is then constructed. The variables used in this expression include the mass, projected frontal area and drag characteristics of the system, the coefficient of rolling resistance, environmental variables such as temperature, barometric pressure, relative humidity, wind speed and direction and the slope of the course. The two expressions are equated and solved using an iterative procedure. Two series of trials were used to assess the predictive accuracy of the model, one using track endurance performances and the other a 26 km road time-trial. The correlations between actual and predicted times have been excellent (0.92-0.95, p < or = 0.0001), with small mean differences (0-1.83% of mean performance time) and mean absolute differences (1.07-3.24%). The model allows us to make predictions about the effect of equipment changes and environmental factors, to compare performances under very different conditions, and to predict the limits of the possible in cycling performance. A range of options designed to improve cycling performance is described.","PeriodicalId":79393,"journal":{"name":"Australian journal of science and medicine in sport","volume":"27 2","pages":"29-33"},"PeriodicalIF":0.0,"publicationDate":"1995-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19503004","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

Children's readiness for learning front crawl swimming. 幼儿学习自由泳的准备情况。

Australian journal of science and medicine in sport Pub Date : 1995-06-01

B A Blanksby, H E Parker, S Bradley, V Ong

引用次数: 0

Injury data collection in the rugby codes. 橄榄球规则中受伤数据的收集。

Australian journal of science and medicine in sport Pub Date : 1995-06-01

T Lower

引用次数: 0

The etiology of paddler's shoulder. 桨肩的病因。

Australian journal of science and medicine in sport Pub Date : 1995-06-01

T W Pelham, L E Holt, R E Stalker

引用次数: 0

The efficacy of isokinetic, isometric and vertical jump tests in exercise science. 运动科学中等速、等距和垂直跳跃试验的功效。

Australian journal of science and medicine in sport Pub Date : 1995-03-01

G Wilson, A Murphy

{"title":"The efficacy of isokinetic, isometric and vertical jump tests in exercise science.","authors":"G Wilson, A Murphy","doi":"","DOIUrl":"","url":null,"abstract":"This research examined the efficacy of several tests of muscular strength and power in their capacity to be related to performance, their ability to effectively discriminate between individuals of different performance levels and their sensitivity in detecting training induced changes to performance. Thirty healthy active subjects performed the following maximal tests of muscular function: (1) Vertical jump; (2) Isokinetic knee extension at 1.05, 3.14 and 5.24 rads s-1; and (3) Isometric rate of force development. Performance was assessed by the peak power output achieved on a cycle test. In addition, subjects participated in a 10 week resistance training program. The isokinetic and vertical jump tests were significantly related to performance (r = 0.5-0.73) and could be used to discriminate between subjects of differing performance levels. However, the isometric rate of force development test was an ineffective assessment modality. None of the tests were able to effectively monitor training induced changes in performance, as evidenced by non-significant correlations between the pre- to post-percentage changes in cycling performance and the test variables. Consequently, alterations to training programs for athletes should be based on changes in actual performance, as opposed to muscular function tests.","PeriodicalId":79393,"journal":{"name":"Australian journal of science and medicine in sport","volume":"27 1","pages":"20-4"},"PeriodicalIF":0.0,"publicationDate":"1995-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"18780851","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

Biomechanical responses of elite swimmers to staleness and recovery. 优秀游泳运动员对疲劳和恢复的生物力学反应。

Australian journal of science and medicine in sport Pub Date : 1995-03-01

S Hooper, L MacKinnon, B Wilson

{"title":"Biomechanical responses of elite swimmers to staleness and recovery.","authors":"S Hooper, L MacKinnon, B Wilson","doi":"","DOIUrl":"","url":null,"abstract":"Tethered swimming forces (TSF), average distance achieved per stroke (D/S) during a submaximal effort swim, and time and D/S for a maximal effort swim were measured to determine changes occurring with staleness and recovery. Fourteen nationally ranked male and female swimmers were studied five times (i.e. early-, mid-, and late-season, during tapering, and after competition). ANOVA and Newman-Keuls post-hoc tests were used to assess changes during the season. Three swimmers were classified as stale and showed a deterioration (0.7%) in maximal performance time from early- to late-season which was significantly different (P < 0.05) from the improvement (3.1%) demonstrated by the non-stale swimmers. Daily self-ratings of fatigue, kept by the swimmers in log books during the season, were significantly higher (P < 0.001) for the stale compared with the non-stale swimmers. No significant differences were established between the stale and non-stale swimmers in TSF or D/S during the season or in the response to tapering. A significant improvement (P < 0.05) in TSF was observed from before to after tapering. It was concluded that TSF and D/S may not change significantly with staleness and that the recovery period of tapering prior to competition allows swimmers to generate greater forces in the water.","PeriodicalId":79393,"journal":{"name":"Australian journal of science and medicine in sport","volume":"27 1","pages":"9-13"},"PeriodicalIF":0.0,"publicationDate":"1995-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"18780853","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

Ending batting slumps in baseball: a qualitative investigation. 结束棒球打击衰退:一项定性调查。

Australian journal of science and medicine in sport Pub Date : 1995-03-01

H Prapavessis, J R Grove

引用次数: 0