Maximum oxygen uptake and body composition of healthy Hong Kong Chinese adult men and women aged 20 - 64 years     

Wong SY  Chan FW  Lee CK  Li M  Yeung F  Lum CC  Choy DT  Woo J 《Journal of sports sciences》2008,26(3):295-302

The aims of the present study were to assess the maximal oxygen uptake and body composition of adult Chinese men and women, and to determine how these variables relate to age. The cross-sectional sample consisted of 196 men and 221 women aged 20 - 64 years. Maximal oxygen uptake (VO2max) was determined by indirect calorimetry during a maximal exercise test on an electrically braked cycle ergometer. The correlations between VO2max and fat mass were -0.52 in men and -0.58 in women. Linear regression defined the cross-sectional age-related decline in VO2max as 0.35 ml kg(-1) min(-1) year(-1) in men and 0.30 ml kg(-1) min(-1) year(-1) in women. Multiple regression analysis showed that more than 50% of this cross-sectional decline in VO2max was due to fat mass, lean mass, and age. Adding fat mass and lean mass to the multiple regression models reduced the age regression mass from 0.35 to 0.24 ml kg(-1) min(-1) year(-1) in men and from 0.30 to 0.15 ml kg(-1) min(-1) year(-1) in women. We conclude that age, fat mass, and lean mass are independent determinants of maximal oxygen uptake in Chinese adults.  相似文献   

Characteristics of the start in women's World Cup skeleton     

Bullock N  Martin DT  Ross A  Rosemond D  Holland T  Marino FE 《Sports biomechanics / International Society of Biomechanics in Sports》2008,7(3):351-360

This study characterizes key elements of the start in elite female World Cup skeleton athletes. The top 20 female competitors in three World Cup races were videotaped within a calibrated space to allow the following components of the start to be quantified: (1) acceleration (velocity at 15-m mark, time to 15-m mark), (2) capacity (time to load, total number of steps to load), and (3) load (velocity at 45-m mark). A correlation analysis was used to establish the relationship between the variables of interest and overall start time (15- to 65-m mark). Velocity at the 15-m mark accounted for 86% of the variance in overall start time at St. Moritz and 85% at Sigulda. A stepwise regression analysis revealed that approximately 89% of the variation in start time could be explained by velocity at the 15-m mark, time to load, and velocity at the 45-m mark. Of the variables analysed in this study, rapid acceleration to attain a high velocity at the 15-m mark was the most important component of a fast overall start time. The importance of the time to load and velocity at the 45-m mark vary according to the different track characteristics.  相似文献   

An improved microscope     

Frank Teal 《Journal of The Franklin Institute》1908,166(3):197-202

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Eye fatigue and its relation to light and work     

Percy W. Cobb  Frank K. Moss 《Journal of The Franklin Institute》1925,200(2):239-247

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The rate of visual work on alternating fields of different brightnesses     

M. Luckiesh  Frank K. Moss 《Journal of The Franklin Institute》1925,200(6):731-738

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Mining fuzzy frequent itemsets for hierarchical document clustering     

Chun-Ling Chen  Frank S.C. Tseng  Tyne Liang 《Information processing & management》2010

As text documents are explosively increasing in the Internet, the process of hierarchical document clustering has been proven to be useful for grouping similar documents for versatile applications. However, most document clustering methods still suffer from challenges in dealing with the problems of high dimensionality, scalability, accuracy, and meaningful cluster labels. In this paper, we will present an effective Fuzzy Frequent Itemset-Based Hierarchical Clustering (F²IHC) approach, which uses fuzzy association rule mining algorithm to improve the clustering accuracy of Frequent Itemset-Based Hierarchical Clustering (FIHC) method. In our approach, the key terms will be extracted from the document set, and each document is pre-processed into the designated representation for the following mining process. Then, a fuzzy association rule mining algorithm for text is employed to discover a set of highly-related fuzzy frequent itemsets, which contain key terms to be regarded as the labels of the candidate clusters. Finally, these documents will be clustered into a hierarchical cluster tree by referring to these candidate clusters. We have conducted experiments to evaluate the performance based on Classic4, Hitech, Re0, Reuters, and Wap datasets. The experimental results show that our approach not only absolutely retains the merits of FIHC, but also improves the accuracy quality of FIHC.  相似文献   

Early-phase neuromuscular adaptations to high- and low-volume resistance training in untrained young and older women     

Cannon J  Marino FE 《Journal of sports sciences》2010,28(14):1505-1514

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New technology. English de-composition: An important technique for program design     

Frank J. Clement 《Performance Improvement》1983,22(3):23-24

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From Maps to Myth: The Census,Turner, and the Idea of the Frontier     

Deborah Epstein Popper  Robert E. Lang  Frank J. Popper 《Journal of American culture (Malden, Mass. : 2003)》2000,23(1):91-102

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Changes in the perception of action possibilities while climbing to fatigue on a climbing wall     

Pijpers JR  Oudejans RR  Bakker FC 《Journal of sports sciences》2007,25(1):97-110

In two experiments we examined changes in the perception of action possibilities as a function of exertion. In Experiment 1, participants repeatedly climbed on a climbing wall in a series of trials that progressively increased in number to 10 trials, resulting in increased exertion. Before and during climbing, the participants judged their maximum reaching height and perceived exertion. On a separate day, participants climbed another 10 trials while performing actual maximum reaches. Higher perceived exertion was associated with decreases in perceived maximum reach while the actual reaches did not decrease. However, the perceptual changes occurred early during task execution when the participants were not yet fatigued. When exertion set in, neither perceived nor actual maximum reaching appeared to be affected. In Experiment 2, we included exhaustion trials. The findings replicated the early changes in perception observed in Experiment 1, which may be explained by hands-on experience with the task. Furthermore, while climbing to exhaustion, perceptual judgements largely changed in keeping with changes in the actual maximum reach. Thus, there appeared to be a functional relationship between participants' actual action capabilities, rather than their state of physical fatigue per se, and perceived action possibilities.  相似文献