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Daniel A. Bizjak Fabian Tomschi Gunnar Bales Elie Nader Marc Romana Philippe Connes Wilhelm Bloch Marijke Grau 《运动与健康科学(英文)》2020,9(6):595-603
ObjectiveTo examine the impact of a 6-week endurance training on red blood cell (RBC) aging and deformability of healthy participants to detect possible improved hemorheological and performance-related adaptations.MethodsA total of 31 participants (17 females and 14 males) performed a 6-week moderate training protocol (three 1-h running sessions per week at 70% of maximal heart rate). Blood was sampled before and after the training. RBCs from each participant were fractioned according to density and age into 4 RBC subfractions. Subfractions were examined for changes of RBC properties, including aging distribution, RBC deformability, RBC microparticles, and phosphatidylserine concentrations. RBC and plasma nitrite levels were measured as indicators of nitric oxide metabolism.ResultsAerobic performance, peak oxygen consumption, ventilatory thresholds, velocity at the aerobic–anaerobic threshold, and lactate at exhaustion improved after training. The relative amount of both young RBCs and old RBCs increased, and the amount of the main RBC fraction decreased. Phosphatidylserine externalization and RBC-derived microparticles decreased. Overall deformability expressed as shear stress required to achieve half-maximum deformation to theoretical maximal elongation index at infinite shear stress improved in unfractioned RBCs (p < 0.001). Nitrite decreased in total (p = 0.001), young (p < 0.001), main (p < 0.001), and old (p = 0.020) aged RBCs and in plasma (p = 0.002), but not in very old RBCs.ConclusionThese results indicate that non-endurance-trained healthy participants benefit from a regular moderate running training program because performance-related parameters improve and a younger RBC population with improved RBC properties is induced, which might support oxygen supply in the microcirculation. 相似文献
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Phyllis Schneider Barbara Frant Hecht 《International Journal of Disability, Development & Education》1995,42(1):41-56
Mothers and their preschool children with developmental delays participated in a storybook activity. Data analysis focused on the relations between maternal and child behaviours in the activity. Several aspects of mothers’ behaviour were related to children's engagement and responsiveness during the task. The more responsive and engaged the child, the more the mother attempted to involve the child in the book activity. Interviews indicated that children's positive attitude towards reading was associated with frequency of reading activity. We conclude that mothers were sensitive to their children's developmental levels and organized the activity in ways appropriate to the child's ability and willingness to participate. 相似文献
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Bettina Müller Tobias Richter Ana Križan Teresa Hecht Marco Ennemoser 《Journal of Experimental Education》2016,84(4):744-763
Reading strategy interventions relying upon peer tutoring are a common way to foster poor readers' comprehension skills. Those interventions are based on the assumption that tutees benefit from the (higher) reading skills of their tutors. However, this interpersonal effect has not yet been tested explicitly because the effectiveness of peer tutoring is commonly analyzed separately for tutees and tutors or with aggregated data. The present study illustrates how interpersonal and individual effects of a peer-tutored reading strategy intervention can be estimated using dyads as units of analysis in structural equation modeling. To demonstrate the application of the model, data from an experimental intervention study comparing the effects of a peer-tutored reading strategy training and a control condition in Grade 4 (N = 68 dyads) were analyzed. 相似文献
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Christine L. Wells Lillian H. Hecht Gary S. Krahenbuhl 《Research quarterly for exercise and sport》2013,84(2):281-285
Verbal and nonverbal communication is a critical mediator of performance in team sports and yet there is little extant research in sports that involves direct measures of communication. Our study explored communication within NCAA Division I female tennis doubles teams. Video and audio recordings of players during doubles tennis matches captured the communications that took place between and during points. These recordings were coded and sequential analysis computed using the Discussion Analysis Tool software (Jeong, 2003). Results indicated that most communications were emotional (i.e., > 50%) or action statements (i.e., > 25%). Winning teams exhibited significantly different communication sequences than losing teams. In particular, winning teams had a more homogeneous model of communication, which perhaps makes message interpretation more reliable. Finally, winning teams exchanged twice as many messages as losing teams. 相似文献
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Jonathan Pettigrew Michelle Miller-Day Janice Krieger Michael L. Hecht 《Journal of Applied Communication Research》2013,41(2):103-122
This study seeks to identify how rural adolescents make health decisions and utilize communication strategies to resist influence attempts in offers of alcohol, tobacco, and other drugs (ATOD). Semi-structured interviews were conducted with 113 adolescents from rural school districts to solicit information on ATOD norms, past ATOD experiences, and substance offer-response episodes. Rural youths’ resistance strategies were similar to previous findings with urban adolescents—refuse, explain, avoid, and leave (the REAL typology)—while unique features of these strategies were identified including the importance of personal narratives, the articulation of a non-user identity, and being “accountable” to self and others. 相似文献
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Michael L. Hecht - Michael L. Hecht is a Liberal Arts Research Professor in the 《Journal of Applied Communication Research》2007,35(4):343-349
This paper tells the story of the multi-layered translational process of the Drug Resistance Strategies Project. The Drug Resistance Strategies Project provides an exemplar of translational scholarship, translating adolescent narratives about their substance use experiences into an efficacious, substance abuse prevention middle school curriculum. The curriculum, called keepin' it REAL, was developed using the principle of cultural grounding and translational performances and has been found to reduce adolescent substance use. The authors tell the story of this project from its inception to its current role as a model substance abuse prevention program. 相似文献
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Why should we take a broader view of assessment theory and research when constructing measures of school achievement? How might we incorporate a learner's awareness of his or her own learning strategies into the assessment process? How could an assessment developer combine the use of psychological constructs and varying contexts for learning in the assessment of competence in mathematics? 相似文献