This research proposes to carry out a principal component analysis using the maximum covariance method, with the aim of finding the most robust spatio-temporal relationships between several candidate predictors and th...This research proposes to carry out a principal component analysis using the maximum covariance method, with the aim of finding the most robust spatio-temporal relationships between several candidate predictors and the accumulated monthly precipitation recorded in Cuba during the period 1980-2020. This process will make it possible to establish quantitative relationships that, together with theoretical considerations, make it possible to reduce the list of predictors to be used for the purpose of obtaining seasonal predictions. The values of the predictors are represented through monthly averages obtained from ERA5 reanalysis, while monthly accumulated precipitation data were obtained from a national-scope grid with 4 km of spatial resolution, used as predictand. The results obtained reflect the highest spatio-temporal correlation values with the first variability mode in all cases, indicating that the usual regime conditions are predominant and have a greater coupling with the precipitation variability in the analyzed temporal scale. In addition, they suggest that the candidates that explain the transport of moisture at low levels, as well as the gradients between the middle and lower troposphere, show the most robust associations. In the same way, the surface temperature of tropical Atlantic Sea, the flow related to Quasi-Biennial Oscillation and the thermodynamic indices, K Index and Galvez-Davison Index, present good degrees of association, for which reason they can be considered the most recommendable for carrying out forecasting experiments.展开更多
目的:通过对高原训练期间男子赛艇运动员肱二头肌微循环最大血流速度储备能力与常规机能指标关系的研究,探讨微循环最大血流速度储备能力应用于运动员身体机能状态监控的可行性;方法:早晨空腹状态下,使用PeriFlux System 5000激光多普...目的:通过对高原训练期间男子赛艇运动员肱二头肌微循环最大血流速度储备能力与常规机能指标关系的研究,探讨微循环最大血流速度储备能力应用于运动员身体机能状态监控的可行性;方法:早晨空腹状态下,使用PeriFlux System 5000激光多普勒血流监测仪对10名运动员肱二头肌微循环血流速度进行无创测试,同时在相应的时间节点对运动员进行指尖采血进行Hb,BU,CK等常规机能指标测试;结果:运动员肱二头肌微循环最大血流速度储备能力与常规机能指标均呈现出一定的负相关性,其中与CK存在显著的负相关(P<0.05),而与Hb,BU则均不存在显著性差异(P>0.05);结论:1)微循环最大血流速度储备能力可与Hb共同作用于运动员有氧能力的评定,且较单一的血红蛋白评定具有测试无创、针对性更强等优点;2)微循环最大血流速度储备能力可较好地反映出运动员对运动强度的适应情况及机体肌肉肌细胞的损伤情况,可作为一种无创性指标与CK共同应用于评价运动员对运动强度的反应.展开更多
文摘This research proposes to carry out a principal component analysis using the maximum covariance method, with the aim of finding the most robust spatio-temporal relationships between several candidate predictors and the accumulated monthly precipitation recorded in Cuba during the period 1980-2020. This process will make it possible to establish quantitative relationships that, together with theoretical considerations, make it possible to reduce the list of predictors to be used for the purpose of obtaining seasonal predictions. The values of the predictors are represented through monthly averages obtained from ERA5 reanalysis, while monthly accumulated precipitation data were obtained from a national-scope grid with 4 km of spatial resolution, used as predictand. The results obtained reflect the highest spatio-temporal correlation values with the first variability mode in all cases, indicating that the usual regime conditions are predominant and have a greater coupling with the precipitation variability in the analyzed temporal scale. In addition, they suggest that the candidates that explain the transport of moisture at low levels, as well as the gradients between the middle and lower troposphere, show the most robust associations. In the same way, the surface temperature of tropical Atlantic Sea, the flow related to Quasi-Biennial Oscillation and the thermodynamic indices, K Index and Galvez-Davison Index, present good degrees of association, for which reason they can be considered the most recommendable for carrying out forecasting experiments.
文摘目的:通过对高原训练期间男子赛艇运动员肱二头肌微循环最大血流速度储备能力与常规机能指标关系的研究,探讨微循环最大血流速度储备能力应用于运动员身体机能状态监控的可行性;方法:早晨空腹状态下,使用PeriFlux System 5000激光多普勒血流监测仪对10名运动员肱二头肌微循环血流速度进行无创测试,同时在相应的时间节点对运动员进行指尖采血进行Hb,BU,CK等常规机能指标测试;结果:运动员肱二头肌微循环最大血流速度储备能力与常规机能指标均呈现出一定的负相关性,其中与CK存在显著的负相关(P<0.05),而与Hb,BU则均不存在显著性差异(P>0.05);结论:1)微循环最大血流速度储备能力可与Hb共同作用于运动员有氧能力的评定,且较单一的血红蛋白评定具有测试无创、针对性更强等优点;2)微循环最大血流速度储备能力可较好地反映出运动员对运动强度的适应情况及机体肌肉肌细胞的损伤情况,可作为一种无创性指标与CK共同应用于评价运动员对运动强度的反应.
