Whole-body vibration effects on the muscle activity of upper and lower body muscles during the baseball swing in recreational baseball hitters     

Reyes GF  Dickin DC  Crusat NJ  Dolny DG 《Sports biomechanics / International Society of Biomechanics in Sports》2011,10(4):280-293

The purpose of this study was to evaluate the effects of whole-body vibration (WBV) on the muscle recruitment of selected upper and lower body muscles during the baseball swing. Participants were recreationally trained males (n = 16, 22 +/- 2 years, 181.4 +/- 7.4 cm, 84.7 +/- 9.0 kg), with previous baseball experience. Subjects participated in three randomized sessions on separate days, consisting of three sets of five swings offa hitting tee. Exercises (upper and lower body dynamic and static movements) with or without WBVexposure were performed between swing sets. During each swing, the gastrocnemius, biceps femoris, gluteus maximus, pectoralis major, latissimus dorsi, and triceps brachii were evaluated for electromyographic (EMG) activity. EMG values were normalized to EMG measured during maximal voluntary isometric contraction. Statistical analysis revealed no significant differences in EMG activity across the three treatments. In addition, the results displayed a specific muscle recruitment order during the swing, starting with the lower body followed by the upper body muscles. This study was the first to report the recruitment order during the baseball swing. Although acute exposure to WBV did not significantly alter the muscle recruitment, these results may prove useful for practitioners looking to enhance baseball swing performance.  相似文献   

Perspective Paper: Assessing Air Quality as Part of a Physical Therapy Plan of Care     

Dennis C. Sobush  Monika Burrescia 《Cardiopulmonary Physical Therapy Journal》2011,22(1):20-24

Purpose: The purposes of this clinical perspective paper are (1) to expand physical therapists’ awareness to the topic of air quality as a health priority when providing professional services; and (2) to provide templates for screening the indoor clinical environments and patient profiles to avert respiratory exacerbations, especially in persons with asthma. Summary of Key Points: The location where a physical therapist practices determines the air quality indices to which a person is exposed. Poor indoor air quality can expose a person to even greater compromise of respiration (ie, Sick Building Syndrome) than outdoor air quality secondary to an array of factors like building materials, the ventilation exchange rate of an enclosed space, chemicals used in cleaning, and humidity. Statement of Conclusions: Extrinsic (ie, environmental) and intrinsic (eg, pre-disposition to airway hypersensitivity) factors must be accounted for by physical therapists to safeguard their patients and themselves from experiencing respiratory compromise and/or distress as a result of a treatment session or their place of employment. Recommendations: Efforts to screen indoor environments for potential triggers and patient risk profiles for abnormal airway reactivity should routinely be undertaken. Individualized Action Plans should be prospectively prepared and readied for implementation when warranted.Key Words: asthma, Sick Building Syndrome, indoor air quality, respiratory impairment  相似文献   

Assessing and Addressing Student Barriers: Implications for Today's College Classroom          下载免费PDF全文

Dorothy A. Osterholt  Sophie Lampard Dennis 《About Campus》2014,18(6):18-24

The increasingly diverse set of learners in colleges and universities poses considerable challenges for educators. Dorothy A. Osterholt and Sophie Lampard Dennis explain the four domains of learning they have identified and suggest ways to apply them to help students overcome a variety of obstacles to learning.  相似文献   

Structural and conceptual interweaving of mathematics methods coursework and field practica     

Damon L. Bahr  Eula Ewing Monroe  Dennis Eggett 《Journal of Mathematics Teacher Education》2014,17(3):271-297

This paper describes a study of observed relationships between the design of a preservice elementary mathematics methods course with accompanying field practicum and changes in the extent to which participating prospective teachers identified themselves with the mathematics reform movement after becoming practicing teachers. The curriculum of the course with its embedded field practicum experiences was designed to support prospective teachers in interweaving methods coursework and pedagogical instruction with classroom practice. University and elementary school structures were interwoven by conducting weekly mathematics methods course sessions at a school site followed immediately by related practicum experiences in classrooms in the school. The interweaving of conceptualizations about mathematics teaching and learning was facilitated as the methods instructor provided professional development for classroom teachers simultaneously with the methods course, encouraging the teachers to create “reform-friendly” classroom environments. Survey data from 68 prospective teachers involved in the project were analyzed to identify and describe relationships between course/practicum experiences and the degree to which they as practicing teachers, 1–3 years following the course/practicum, identified with a reform mathematics perspective, as well as to examine factors influencing those relationships.  相似文献   

No Laughing Matter: Values,Perception, and the Demise of AIDS Jokes     

Dennis Hall 《Journal of American culture (Malden, Mass. : 2003)》1993,16(2):25-30

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Retirement preparation programs: Issues in planning and selection     

Helen Dennis 《Journal of Career Development》1986,13(2):30-38

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Research results of the National Day Care Study : By Jeffrey Travers and Barbara D. Goodson (with others). Cambridge,MA: Abt books, 1980. Pp. 256. No price listed (paper).     

Dennis R. Young 《Economics of Education Review》1982,2(3):301-303

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DESIGN SKILLS AND CREATIVITY IN THE APPLIED SCIENCES     

Dennis James 《European Journal of Engineering Education》1978,3(2):155-159

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Demographic characteristics and rates of progress of deaf and hard of hearing persons receiving substance abuse treatment     

Moore D  McAweeney M 《American annals of the deaf》2006,151(5):508-512

A lack of demographic information and data related to the achievement of short-term goals during substance abuse treatment among persons who are deaf or hard of hearing dictated the need for the study. New York State maintains a database on all individuals who participate in treatment. Within this database, 1.8% of persons in treatment for substance use disorder (SUD) were also deaf or hard of hearing. As hypothesized, members of the deaf and hard of hearing sample were older, likelier to be white, and likelier to be female, relative to the SUD-only group. For both groups, alcohol, heroin, and cocaine had the highest rates of reported use. Achievement of short-term goals in the areas of alcohol use, drug use, vocational/educational goals, and overall goals indicated no differences between the deaf and hard of hearing group and the SUD-only group. Implications of these findings are discussed.  相似文献   

Audited key performance indicators: The western Australian university experience     

Dennis C. Ham  Alan C. Marshall 《Tertiary Education and Management》2013,19(4):255-262

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