Cardiorespiratory and Perceptual Responses to Arm Crank and Wheelchair Exercise Using Various Handrims in Male Paraplegics     

G. William Gayle PhD  Roberta L. Pohlman  Roger M. Glaser  Glen M. Davis 《Research quarterly for exercise and sport》2013,84(3):224-232

Abstract

The purpose of the present study was to determine the effects of 10-in [025–m] versus 16-in [0.41-m] wheelchair handrims on cardiorespiratory and psychophysiological exercise responses during wheelchair propulsion at selected velocities. Fifteen male paraplegics (27.0 ± 5.5 yrs) performed three discontinuous exercise tests (ACE = arm crank ergometer; WERG = wheelchair roller ergometer) and two 1600-m performance-based track trials (TRACK) under simulated race conditions. There were no significant differences in HR, VO₂, V_E, HLa, or category-ratio ratings of perceived exertion (RPE) using different handrims during wheelchair propulsion at 4 km-h¹. In contrast, at 8 km-h^?1 subjects demonstrated a 13% lower steady state VO₂ (p < .05) using the 10-in handrims, coincident with a 23% lower V_E Steady state HR during WERG at 8 km-h^?1 using the 10-in (124.4 ± 39 b.min^?1) or 16-in (130.6 ± 4.6 b.min^?1) handrims were not significantly different. There were also no significant differences between ACE or WERG conditions during maximal effort for VO₂ or V_E. However, HRpeak during ACE was 7% higher than HRpeak during WERG16 (183 ± 15 b.min^?1 vs. 171 ± 12 b.min^?1, p < .05), and whole blood HLa during ACE was also significantly higher (by 2.3-2.5 mmol; p < .05) compared to WERG. There were no significant differences for HR, performance time, or RPE between trials using different handrim diameters during the 1600-m event. In contrast, HLa was significantly lower using smaller handrims (9.9 mmol) compared with larger handrims (11.3 mmol), paralleling a similar difference in the laboratory. Although these data demonstrated few significant differences of physiologic responses between trials using different handrims, there was a tendency for a lower metabolic stress using the smaller handrims.  相似文献   

The Role of Cognitive Appraisal and Friendship Provisions in Adolescents' Affect and Motivation toward Activity in Physical Education     

Susan c. Duncan PhD 《Research quarterly for exercise and sport》2013,84(3):314-323

Abstract

This study investigated the mediational role of affect in the influence of perceived success, causal attributions, and friendship provisions on choice and future expectancies for success and enjoyment, using a multi-sample structural equation modeling approach. Subjects were 422 seventh- and eighth-grade students participating in physical education classes. Higher levels of perceived success, personally controllable attributions, companionship, and esteem support were found to positively influence levels of affect experienced, which in turn enhanced future expectancies for success and enjoyment in physical education and choices to participate in physical activity outside of school. Furthermore, participation experience outside of school influenced, adolescents' perceptions within the physical education setting and their consequent affect and motivation.  相似文献   

Validation of Criterion-Referenced Standards for Tests of Arm and Shoulder Girdle Strength and Endurance     

William J. Rutherford PhD  Charles B. Corbin 《Research quarterly for exercise and sport》2013,84(2):110-119

Abstract

The purpose of this study was to establish criterion-referenced standards for selected tests of arm and shoulder girdle strength and endurance for college females. Several popular tests of arm and shoulder girdle strength and endurance were administered to equal numbers of trained and untrained college females (N = 92) to generate data for the analysis. The contrasting groups method (Berk, 1976; Safrit & Wood, 1990) yielded the following criterion cutoff scores that classified college females as trained or untrained on the basis of regular upper arm and shoulder girdle resistance training: pull-ups = .5 repetitions (reps), 90° push-ups = 16 reps, flexed arm hang = 5s, seated chest press = 24.5 kg, seated biceps curl = 16.4 kg, seated lat pull (latissmus dorsi pull-down) = 38.2 kg, absolute strength index = 86.4 kg, and relative strength index = .6 kg per kg of body weight. Cross-validation of the standards on an independent sample of college females (N = 112) suggested stability of the cutoff scores for pull-ups, flexed arm hang, and relative strength.  相似文献   

Enhancing Motor Learning Through Dyad Practice     

Barbara L. Drinkwater PhD  FACSM 《Research quarterly for exercise and sport》2013,84(3):197-206

Abstract

It has been shown that practice in dyads, as compared to individual practice, can enhance motor learning and increase the efficiency of practice (as two participants can be trained at the same time; Shea, Wulf, &; Whitacre, 1999). The dyad practice protocol used by Shea et al. included both observation and dialogue between partners. Thus, it was not clear whether the learning benefits of dyad practice were due to observation, dialogue, or both. The present study examined the individual and interactive effects of observation and dialogue. The task used was speed cup stacking. Participants practiced under one of four conditions: observation/dialogue, observation/no dialogue, no observation/dialogue, and no observation/no dialogue. The two conditions that included observational practice were more effective (i.e., produced faster movement times) than the two conditions without it, both during practice and on a retention test performed under individual performance conditions. This suggests that the learning advantages of dyad practice are primarily due to the opportunity to observe another learner.  相似文献   

Variance and Invariance in Expert and Novice Triple Junipers     

Brian K. V. Maraj PhD  Digby Elliott  Timothy D. Lee  Barbara J. Pollock 《Research quarterly for exercise and sport》2013,84(4):404-412

Abstract

The purpose of this study was to examine relative timing, relative distance, and effector independence characteristics of the triple jump. We videotaped expert and novice triple jumpers using standing and running starts. On some trials, the triple jumpers were required to take off from their nondominant leg. Gentner's (1987) interaction test was used to assess the proportional duration model in describing the timing of the component submovements. For both experts and novices, the proportional durations varied with the type of start. For experts, the relative timing of the jump components was independent of the take-off leg. The findings were mixed for the novices. Similar results were obtained when relative distance was examined. These results are discussed with respect to constructs related to variability in skilled performance.  相似文献   

Rheingold,Howard (2012) Net smart MIT Press (Cambridge MA & London) isbn 978‐0‐262‐01745‐9 322 pp £17.95 http://mitpress.mit.edu/catalog/item/default.asp?ttype=2&tid=12827     

Samuel King PhD 《British journal of educational technology : journal of the Council for Educational Technology》2012,43(6):E177-E179

This book is about the identification, development and use of the critical literacies that are necessary for the effective use of digital media and social networks—including individual participation but also cyber sociality, the reciprocal or co‐creation of social capital for the greater good. The literacies are attention, critical consumption (“crap detection”), participation, collaboration and network smarts. If it seems that the content of this book is likely to be relevant to you, I recommend you buy your own copy. Samuel King  相似文献   

A Fine Balance: Instructor Self-Disclosure in the Classroom     

Brian M. Rasmussen PhD  RSW  Faye Mishna PhD  RSW 《Journal of Teaching in Social Work》2013,33(1-2):191-207

This paper explores the issue of the instructor's self-disclosure within a classroom. Theoretically, the paper offers a broad relational framework from which we discuss dynamics regarding the instructor's inevitable use of self-disclosure and its impact on the student-instructor relationship and the learning process. Further, we survey the literature from the clinical and supervisory domains for relevant ideas. We recommend that instructors judiciously and reflectively self-disclose in the classroom. Conscious awareness of the dynamics of self-disclosure helps to monitor the effectiveness of this activity. A fine balance between thoughtful restraint and genuine openness helps to facilitate this goal.  相似文献   

Innovations Applied to the Classroom for Involuntary Groups: Implications for Social Work Education     

Michael Chovanec PhD 《Journal of Teaching in Social Work》2013,33(1-2):209-225

There is an increasing demand for social work students to be prepared to work with a wide range of involuntary groups including the more traditional court-ordered programs in domestic abuse and chemical dependency, as well as groups in mental health and schools that provide outreach to high-risk client populations. This paper introduces three innovative frameworks including Reactance theory, Stages of Change model and Motivational Interviewing. Classroom guidelines and exercises are presented that help students integrate these interventions as they develop their group work skills. Strategies for involving students in moving these innovations towards best practices with involuntary groups are discussed.  相似文献   

Preparing for the Inevitable: Training Social Workers to Cope with Client Suicide     

Sara Sanders PhD  LSW  Jodi M. Jacobson PhD  LCSW-C  Laura Ting PhD  LCSW-C 《Journal of Teaching in Social Work》2013,33(1-2):1-18

Little attention has been given to educating and training social work students and professionals about working with suicidal clients. This article summarizes the literature on client suicide and the professional social worker, as well as presents results from a mixed methods study, which utilized both qualitative and quantitative data collected from a national study on client suicide among social workers. The results indicate that 55% of social workers will experience at least one client suicide attempt and 31% will experience a client suicide completion during the course of their career. Additionally, less than 50% of the social workers surveyed received previous training or education about client suicide in their MSW programs. Suggestions from social workers for the content of training classes on client suicide are included. Implications for practice and research are also discussed.  相似文献   

Student Research Projects and the Institutional Review Board     

Nancy Shore PhD 《Journal of Teaching in Social Work》2013,33(3):329-345

Graduate social work students often are required to complete an evaluation or research project. Research instructors work with their students to assure that these projects are rigorous as well as ethical. This study focuses upon the relationship of student projects and the Institutional Review Board (IRB). The IRB aims to strengthen research ethics and to assure that study participants are not exploited. Sixteen MSW research instructors' shared their experiences guiding students through the IRB. Study participants identified benefits and challenges of having students experience the IRB, as well as recommendations on how to facilitate the review process. Additionally participants reflected upon how they determine IRB review requirements.  相似文献