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The power output achieved at peak oxygen consumption (VO2peak) and the time this power can be maintained (i.e., Tmax) have been used in prescribing high-intensity interval training. In this context, the present study examined temporal aspects of the VO2 response to exercise at the cycling power that output well trained cyclists achieve their VO2peak (i.e., Pmax). Following a progressive exercise test to determine VO2peak, 43 well trained male cyclists (M age = 25 years, SD = 6; M mass = 75 kg, SD = 7; M VO2peak = 64.8 ml x kg(-1) x min(-1), SD = 5.2) performed two Tmax tests 1 week apart. Values expressed for each participant are means and standard deviations of these two tests. Participants achieved a mean VO2peak during the Tmax test after 176 s (SD = 40; M = 74% of Tmax, SD = 12) and maintained it for 66 s (SD = 39; M = 26% of Tmax, SD = 12). Additionally, they obtained mean 95% of VO2peak after 147 s (SD = 31; M = 62% of Tmax, SD = 8) and maintained it for 95 s (SD = 38; M = 38% of Tmax, SD = 8). These results suggest that 60-70% of Tmax is an appropriate exercise duration for a population of well trained cyclists to attain VO2peak during exercise at Pmax. However, due to intraparticipant variability in the temporal aspects of the VO2 response to exercise at Pmax, future research is needed to examine whether individual high-intensity interval training programs for well trained endurance athletes might best be prescribed according to an athlete's individual VO2 response to exercise at Pmax. 相似文献
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Ned Brophy-Williams Matthew William Driller Cecilia Mary Shing James William Fell Shona Leigh Halson 《Journal of sports sciences》2015,33(13):1403-1410
The purpose of this investigation was to measure the interface pressure exerted by lower body sports compression garments, in order to assess the effect of garment type, size and posture in athletes. Twelve national-level boxers were fitted with sports compression garments (tights and leggings), each in three different sizes (undersized, recommended size and oversized). Interface pressure was assessed across six landmarks on the lower limb (ranging from medial malleolus to upper thigh) as athletes assumed sitting, standing and supine postures. Sports compression leggings exerted a significantly higher mean pressure than sports compression tights (P < 0.001). Oversized tights applied significantly less pressure than manufacturer-recommended size or undersized tights (P < 0.001), yet no significant differences were apparent between different-sized leggings. Standing posture resulted in significantly higher mean pressure application than a seated posture for both tights and leggings (P < 0.001 and P = 0.002, respectively). Pressure was different across landmarks, with analyses revealing a pressure profile that was neither strictly graduated nor progressive in nature. The pressure applied by sports compression garments is significantly affected by garment type, size and posture assumed by the wearer. 相似文献
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Wu‐Yuin Hwang Nian‐Shing Chen Rustam Shadiev Jin‐Sing Li 《British journal of educational technology : journal of the Council for Educational Technology》2011,42(6):1016-1028
Previous studies have demonstrated that making annotations can be a meaningful and useful learning method that promote metacognition and enhance learning achievement. A web‐based annotation system, Virtual Pen (VPEN), which provides for the creation and review of annotations and homework solutions, has been developed to foster learning process among students. In order to explore the effects of reviewing annotations and homework solutions on learning achievement, a quasi‐experiment was conducted with VPEN in a math class over a period of 4 months. It was found that reviewing own text annotations has a significant influence on learning achievement; while on the contrary, reviewing peers' text annotations has no significant influence on learning achievement. Our results show that students gain more from reviewing their own annotations than from reviewing the annotations made by peers, a contrast which reveals that annotations hold additional meaning for their creators. Further investigation revealed that only the quantity of text annotations among all other variables can significantly predict students' learning achievement. This finding may suggest that text annotations play more important roles to learning achievement than other variables, like homework. The reason is because text annotations are created by learners actively on voluntary base whereas homework is usually assigned by the teachers. Based on our findings, we suggest that teachers may consider incorporating learning activities that can foster metacognitive development into the learning process, like making annotations, solving homework and reviewing them, whereas peer learning should be encouraged only for reviewing the homework solutions of their peers with good learning achievement. 相似文献
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Relationship between laboratory-measured variables and heart rate during an ultra-endurance triathlon 总被引：1，自引：1，他引：0
Laursen PB Knez WL Shing CM Langill RH Rhodes EC Jenkins DG 《Journal of sports sciences》2005,23(10):1111-1120
The aim of the present study was to examine the relationship between the performance heart rate during an ultra-endurance triathlon and the heart rate corresponding to several demarcation points measured during laboratory-based progressive cycle ergometry and treadmill running. Less than one month before an ultra-endurance triathlon, 21 well-trained ultra-endurance triathletes (mean +/- s: age 35 +/- 6 years, height 1.77 +/- 0.05 m, mass 74.0 +/- 6.9 kg, = 4.75 +/- 0.42 l x min(-1)) performed progressive exercise tests of cycle ergometry and treadmill running for the determination of peak oxygen uptake (VO2peak), heart rate corresponding to the first and second ventilatory thresholds, as well as the heart rate deflection point. Portable telemetry units recorded heart rate at 60 s increments throughout the ultra-endurance triathlon. Heart rate during the cycle and run phases of the ultra-endurance triathlon (148 +/- 9 and 143 +/- 13 beats x min(-1) respectively) were significantly (P < 0.05) less than the second ventilatory thresholds (160 +/- 13 and 165 +/- 14 beats x min(-1) respectively) and heart rate deflection points (170 +/- 13 and 179 +/- 9 beats x min(-1) respectively). However, mean heart rate during the cycle and run phases of the ultra-endurance triathlon were significantly related to (r = 0.76 and 0.66; P < 0.01), and not significantly different from, the first ventilatory thresholds (146 +/- 12 and 148 +/- 15 beats x min(-1) respectively). Furthermore, the difference between heart rate during the cycle phase of the ultra-endurance triathlon and heart rate at the first ventilatory threshold was related to marathon run time (r = 0.61; P < 0.01) and overall ultra-endurance triathlon time (r = 0.45; P < 0.05). The results suggest that triathletes perform the cycle and run phases of the ultra-endurance triathlon at an exercise intensity near their first ventilatory threshold. 相似文献
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2009年,约翰·霍普金斯大学医学院实施了一项全新的课程体系——"从基因到社会",其目的在于:更为宽泛地重构健康与疾病的相互关系,鼓励学生们在一个包含社会、文化、心理和环境等多维变量的综合系统中探索与患者的健康状况相关的生物学特性。本文描述了新课程的设计理念及其五年规划过程,包括课程目标的确定、课程的构建、新教学楼的建造、学生自身能力及教师发展的促进、横向和纵向结构的建立等。应对新课程挑战的关键因素在于:领导的支持、与教职员工的对话和沟通、不同群体和层面的广泛参与、避免井蛙之见、通过课程试点来测试教学理念和方法等。 相似文献
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Dan Lin Yingyi Liu Huilin Sun Richard Kwok Shing Wong Susanna Siu-sze Yeung 《Reading and writing》2017,30(1):87-103
The present longitudinal study investigated the role of spelling as a bridge between various reading-related predictors and English word reading in Chinese children learning English as a Second Language (ESL). One hundred and forty-one 5-year-old kindergarten children from Hong Kong, whose first language (L1) was Cantonese and second language (L2) was English, were administered tests of phonological awareness, letter knowledge, English vocabulary, spelling and English word reading at three time points (T1, T2 and T3) at 3-month intervals over a 6-month period. Nonverbal IQ was included as a control variable. The results showed that phonological awareness, letter knowledge and English vocabulary at T1 all predicted English word reading (T3) through spelling (T2). Further mediation analyses showed that, for phonological awareness and English vocabulary, full mediation effects were found. For letter knowledge, a partial mediation effect was observed. These results suggest that, in Chinese ESL kindergarteners, reading-related predictors foster word reading via spelling, a process that intersects phonology, orthography and semantics. Practical implications of these findings were also discussed. 相似文献
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Cognitive profiling in Chinese developmental dyslexia with attention-deficit/hyperactivity disorders
Won Shing Raymond Chan Se Fong Hung Suet Nga Liu Cheuk Kiu Kathy Lee 《Reading and writing》2008,21(6):661-674
The cognitive profiles of children with Developmental Reading Disorder (RD) and Attention-Deficit/Hyperactivity Disorders
(ADHD) have been extensively studied in alphabetic language communities. Deficits in phonological processing and rapid naming
have been implicated as core features of RD although whether the latter is a deficit specific to RD remains controversial.
Similar research aiming to explore the cognitive profiles of children with both RD and ADHD in non-alphabetic language communities
is limited. The specificity of rapid naming deficit to RD among Chinese has yet to be studied. In the first study, 43 Chinese
children with confirmed diagnoses of RD + ADHD were assessed on their cognitive abilities in relating to reading. In the second
study, the specificity deficit hypothesis of rapid naming to RD but not ADHD was examined. A digit naming test was administered
to the RD + ADHD group (43 subjects) and an ADHD only group (49 subjects). In regard to cognitive profiling, rapid naming
and orthographic knowledge were found to be the most common deficits among the Chinese RD + ADHD group. This co-morbid group
was also found to have a significant deficit performance on the rapid naming task than the ADHD only group. The present findings
support the double dissociation hypothesis in cognitive deficit between RD and ADHD. The results of both studies are discussed
with reference to the findings of the Western counterparts. 相似文献
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Wong Kwok Shing Richard 《Early Years: An International Journal of Research and Development》2006,26(3):279-293
Informed by knowledge of linguistics, research findings in the areas of monolingual and bilingual acquisition, dyslexia and speech therapy clinical practice, five factors are proposed to argue that the acquisition of English by young non‐native learners can be enhanced by learning activities which take into account factors of developmental sequence in language acquisition, language‐specific properties, the relationship between oral and written language, the what‐to‐learn‐first issue and the quality of the language input. Proper language goals can be set and appropriate activities designed, only if the language input provider interacts with a learner in a concrete activity while being sensitive to the developmental trajectory of monolingual speaking children, the development of the less dominant language in a bilingual child, the prosodic and phonological differences between the learner's mother tongue and the target language, the importance of phonological awareness which defines dyslexia, the use of non‐abstract language structures grounded in concrete lexical items in the early stage of language acquisition and the strategy of expanding learners' utterance by one element as used in speech therapy. 相似文献