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1.
Silvia Fantozzi Andrea Giovanardi Fabrício Anício Magalhães Rocco Di Michele Matteo Cortesi Giorgio Gatta 《Journal of sports sciences》2016,34(11):1073-1080
The analysis of the joint kinematics during swimming plays a fundamental role both in sports conditioning and in clinical contexts. Contrary to the traditional video analysis, wearable inertial-magnetic measurements units (IMMUs) allow to analyse both the underwater and aerial phases of the swimming stroke over the whole length of the swimming pool. Furthermore, the rapid calibration and short data processing required by IMMUs provide coaches and athletes with an immediate feedback on swimming kinematics during training. This study aimed to develop a protocol to assess the three-dimensional kinematics of the upper limbs during swimming using IMMUs. Kinematics were evaluated during simulated dry-land swimming trials performed in the laboratory by eight swimmers. A stereo-photogrammetric system was used as the gold standard. The results showed high coefficient of multiple correlation (CMC) values, with median (first–third quartile) of 0.97 (0.93–0.95) and 0.99 (0.97–0.99) for simulated front-crawl and breaststroke, respectively. Furthermore, the joint angles were estimated with an accuracy increasing from distal to proximal joints, with wrist indices showing median CMC values always higher than 0.90. The present findings represent an important step towards the practical use of technology based on IMMUs for the kinematic analysis of swimming in applied contexts. 相似文献
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John Mazzeo 《Educational Measurement》1989,8(2):27-28
Book reviewed in this article:
The Influence of Cognitive Psychology on Testing Royce R. Ronning, John A. Glover, Jane C. Conoley & Joseph C. Witt (Eds.) 相似文献
The Influence of Cognitive Psychology on Testing Royce R. Ronning, John A. Glover, Jane C. Conoley & Joseph C. Witt (Eds.) 相似文献
3.
Rosemary A. Rosser Sally Stevens Ensing John Mazzeo 《Contemporary educational psychology》1985,10(2):95-103
Children's ability to discriminate reflections and rotations of visual stimuli was examined within the confines of a mental rotation task. It was hypothesized that success would be affected by both characteristics of the stimulus and by the subtlety of the discrimination required. Forty 3- to 4-year-old children were directed to mentally rotate a stimulus a given number of degrees and to discriminate the appearance of the rotated stimulus from among a set of alternatives. Four stimuli differing in the number of visual orientation cues were utilized across 24 trials. A significant effect was found for number of orientation cues, and data indicated the difficulty children experienced detecting reflections, a task which bears close resemblance to the yes/no option in prototypic rotation studies. Children were only successful with a limited range of stimuli when discrimination of a reflected foil was not required. Results are discussed in light of discrepant findings about children's kinetic imagery ability and the advisability of using this particular paradigm with young Children. 相似文献
4.
Dimitra Kovala-Demertzi Leuteris Papathanasis Rocco Mazzeo Mavroudis A. Demertzis Evagelia A. Varella Silvia Prati 《Journal of Cultural Heritage》2012,13(1):107-113
Optical microscopy, cross-section and fragment Micro-FTIR spectroscopic techniques along with microchemical tests were used for the identification of pigments in two different samples of an icon. Representing the Last Judgement, and painted by the Greek master Ioannis from the village of Kapesovo in the year 1771, the kneeling desk icon under investigation is a noteworthy contribution to the study of materials in post-Byzantine visual arts. The main components found in the ground layer of both samples were gypsum, beeswax and a proteinaceous material. Cinnabar, Prussian blue and cerussite were identified on the paint layers. The binding medium on the paint layers was weddelite. The materials used in the painting and ground layers were characterized in order to clarify the painting technique. Proteinaceous materials have been identified as binders for the pigments, indicating a tempera painting technique. 相似文献
5.
This bibliography of nonserial publications consists of 610 annotations. It is intended as a guide to the development of a collection for librarians and for health professionals in research and education. References are mostly to publications from 1960. Titles are in English. Both primary and secondary sources are cited. 相似文献
6.
Craig M. Whitworth-Turner Rocco Di Michele Ian Muir Warren Gregson Barry Drust 《European Journal of Sport Science》2019,19(5):576-584
The current study examined how sleep may be influenced by the scheduling of training and match load within 10 youth-soccer players. Sleep was measured over a 14-day in-season period using a commercially available wireless sleep monitor. Each collected sleep variable; lights out, sleep latency, total sleep time wake after sleep onset and final awakening, was compared for the specific day within the training schedule (e.g. match day [MD], day after match [MD?+?1]) and to training/match load (high-speed distance (>5.5 m/s) [HSD] and rating of perceived exertion. The data were analysed using mixed models and effect sizes, to describe the magnitude of effects that training schedule and training load may have on sleep. A reduction of sleep duration was observed on the day after the match (MD?+?1) in relation to the training days preceding the match (MD-2: ?65 min, ES: 0.89?±?0.79; MD-1 ?61 min, ES: 0.82?±?0.64) and reduction on match day (+45 min; ES: 1.91?±?1.69). This may suggest youth-soccer players actively change their sleep scheduling behaviours in relation to the imposed soccer schedule. Increased high-speed running (for every 100 m) showed a small increase to total sleep time (+9 min; ES: 0.48?±?0.31). This may suggest that increases in training load may be associated with small increases in sleep quantity. Such observations may highlight that the type of day and the associated load within the training microcycle may have important consequences for sleep within youth-soccer players. 相似文献
7.
Rosemary A. Rosser John Mazzeo Patricia F. Horan 《Contemporary educational psychology》1984,9(2):135-145
In this examination of young children's acquisition of geometric skills, spatial performances were conceptualized as specific combinations of actions applied within stimulus contexts. Since both actions and context can vary, a number of different combinations can be specified. In this study, the relationships among eight such combinations were examined and predicted patterns compared with observed ones. Fifty-four 3-, 4-, and 5-year-old children were presented with 24 geometric displays depicting a variety of geometric relations. Subjects were required to either match or recall the displays in both a reconstruction and a recognition task format thereby responding across different types of action demands. The geometric displays depicted information organized either around a single axis (horizontal or vertical) or around both axes, the variation in context. The results of a mixed design ANOVA revealed a good fit with the hypothesized predictions. The findings are discussed in terms of the development of spatial skills, information theory, and of skill generalization. 相似文献
8.
Because of the radical reorientation of financial aid policies in the eighties, loan indebtness and the amount of federal subsidy of loans have increased dramatically. Paralleling these developments has been the growth of the proprietary sector of postsecondary education and the use of federal-supported financial aid by this sector's students. This article examines the impact of current financial aid policies on different sectors. Evidence appears clear that new policy is required to serve equity and human and social capital development. The success of the proprietary sector in growing its market share at the expense of other sectors—in particular, community colleges—provides some useful lessons about aggressive recruiting. 相似文献
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10.
Giorgio Gatta Rocco Di Michele 《Sports biomechanics / International Society of Biomechanics in Sports》2013,12(4):480-491
This study aimed to compare the power produced by the flutter-kick action at different swimming velocities. Eighteen high-level male swimmers completed a maximal 15-m flutter-kicking sprint and underwent two tests (one passive and one with maximal flutter-kicking) in which they were towed at six velocities ranging from 1.0 to 2.0 m/s. Power values were computed for each velocity, and selected kinematic indices were evaluated at 1.2 and 2.0 m/s. The highest power (54 ± 8 W) was observed at the velocity at which the drag equaled the propulsive force (1.27 ± 0.08 m/s), which was similar to that recorded in the flutter-kicking sprint (1.26 ± 0.09 m/s). Thereafter, power decreased significantly with increasing velocity, up to 17 ± 10 W (at 2.0 m/s). The angle between the horizontal and the line connecting the highest and lowest points of the malleolus trajectory was significantly wider at 1.2 m/s than at 2.0 m/s (75 ± 4° vs. 63 ± 6°). This could explain the change of power with velocity because all the other kinematic indices considered were similar at the two velocities. These results suggest that the propulsive role of the flutter-kick increases as the swimming velocity decreases. 相似文献