Threshold frequency of an electrically induced cramp increases following a repeated,localized fatiguing exercise

Abstract

Though clinical observations and laboratory data provide some support for the neuromuscular imbalance theory of the genesis of exercise-associated muscle cramps, no direct evidence has been published. The purpose of this study was to determine the effect of local muscle fatigue on the threshold frequency of an electrically induced muscle cramp. To determine baseline threshold frequency, a cramp was electrically induced in the flexor hallucis brevis of 16 apparently healthy participants (7 males, 9 females; age 25.1 ± 4.8 years). The testing order of control and fatigue conditions was counterbalanced. In the control condition, participants rested in a supine position for 30 min followed by another cramp induction to determine post-threshold frequency. In the fatigue condition, participants performed five bouts of great toe curls at 60% one-repetition maximum to failure with 1 min rest between bouts followed immediately by a post-threshold frequency measurement. Repeated-measures analysis of variance and simple main effects testing showed post-fatigue threshold frequency (32.9 ± 11.7 Hz) was greater (P < 0.001) than pre-fatigue threshold frequency (20.0 ± 7.7 Hz). An increase in threshold frequency seems to demonstrate a decrease in one's propensity to cramp following the fatigue exercise regimen used. These results contradict the proposed theory that suggests cramp propensity should increase following fatigue. However, differences in laboratory versus clinical fatiguing exercise and contributions from other sources, as well as the notion of a graded response to fatiguing exercise, on exercise-associated muscle cramp and electrically induced muscle cramp should be considered.     

Individual differences in the self-image of adolescents with learning disabilities: the roles of severity, time of diagnosis, and parental perceptions.

The self-images of 49 adolescents with learning disabilities (Grades 9 through 12, mean age = 15.9) and 49 normally achieving peers (Grades 9 through 12, mean age = 16.0) were compared using the Offer Self-Image Questionnaire (OSIQ). The group with LD scored significantly lower than the comparison group on 4 of the 10 OSIQ scales. Later-diagnosed adolescents with LD scored significantly higher than early-diagnosed adolescents on two of the scales. Severity of the learning disability was not found to be related to self-image scores. In a second study, parental perceptions of the self-images of 28 of the 49 students with LD were studied by administering the Offer Parent-Adolescent Questionnaire (OPAQ) and an informal questionnaire to their parents. On 6 of the 10 OPAQ scales, parents perceived their children as having a lower self-image than the adolescents themselves reported. Significant but moderate relationships were found between parents' perceptions and adolescent self-image scores. Results of the two studies are interpreted in terms of a multidimensional conception of self-image that considers factors inherent to the individual as well as interpersonal and institutional factors.     

Perceptions of anatomy: critical components in the clinical setting

The evolution in undergraduate medical school curricula has significantly impacted anatomy education. This study investigated the perceived role of clinical anatomy and evaluated perceptions of medical students' ability to apply anatomical knowledge in the clinic. The aim of this study was to develop a framework to enhance anatomical educational initiatives. Unlike previous work, multiple stakeholders (clinicians, medical students, and academic anatomists) in anatomy education were evaluated. Participants completed an eleven-point Likert scale survey written by the investigators. Responses from both clinical educators and medical students at Penn State Milton S. Hershey Medical Center and College of Medicine suggest that medical students are perceived as ill-prepared to transfer anatomy to the clinic. Although some areas of patient management differ in relevancy to anatomical education, there are areas of clinical care which were uniformly ranked as relying heavily on anatomical knowledge (imaging and diagnostic studies, physical examination, and arrival at correct diagnosis) by a variety of clinical specialists. Our results suggest a need for advanced anatomy courses to be taught coincidental with medical students' clinical education. Development of these courses would optimally rely on input from both clinicians and academic anatomists, as both cohorts rated clinical anatomy similarly (P ≥ 0.05). Additionally, we hypothesize that preclinical students' application of anatomy would be enhanced if clinical context was derived from areas of clinical care which rely heavily on anatomy, whereas courses designed for advanced medical students will benefit from anatomical context focused on specialty specific aspects of clinical care identified in this study.     

International Communications

Church, Communication, Development (Committee on Society, Development, and Peace; Publications Department; Ecumenical Centre, 150 Route de Ferney, 1211 Geneva 20, Switzerland, $3.50)

Ithiel de Sola Pool, Philip Stone and Alexander Szalai's Communications, Computers and Automation for Development (UNITAR Research Reports No. 6, UNITAR, 801 United Nations Plaza, New York 10017, $2.00)

George Melly's Revolt into Style: the Pop Arts in Britain (Penguin [hardback], $8.95)

T.C. Worsley's Television: The Ephemeral Art (London: Alan Ross, $9.00)

D.G. Bridson's Prospero and Ariel: The Rise and Fall of Radio—A Personal Recollection (London: Gollancz, $10.50)

Raymond Durgnat's A Mirror for England: British Movies from Austerity to Affluence (Praeger, $11.95)

Asa Briggs History of Broadcasting in the United Kingdom (Oxford University Press, 1961, 1965)     

Advertising

How it Was in Advertising: 1776-1976 ($6.95, paper, 110 pp.)

Vernon Fryburger, The New World of Advertising ($6.95, paper, 129 pp.)

William A. Robinson, 100 Best Sales Promotions (annual, $19.95, about 140 pp. each)

Herbert S. Gardner Jr. The Advertising Agency Business ($19.95, 211 pp.)

Jack Z. Sissors and E.R. Petray Advertising Media Planning ($12.95, 341 pp.)

Arthur Bellaire Controlling Your TV Commercial Costs ($19.95, 166 pp.)

Julie M. Moss '77 Ayer Public Relations and Publicity Style Book (Ayer Press, 210 West Washington Square, Philadelphia, Pa. 19106—$9.95)     

Film History

John W. Landon BEYOND THE MIGHTY WURLITZER: THE HISTORY OF THE THEATRE PIPE ORGAN (Westport, Connecticut: Greenwood Press,,1983—$29.95).

Susannah Harris Stone THE OAKLAND PARAMOUNT (Berkeley California: Lancaster-Miller Publishers, 1981—$11.95).

John Fell FILM BEFORE GRIFFTTH (Berkeley, California: University of California Press, 1984—$24.50/$10.95).

Herbert Marshall MASTERS OF THE SOVIET CINEMA: CRIPPLED CREATIVE BIOGRAPHIES (London: Routledge 8 Kegan Paul, 1983—$29.95).

John Kobal and V.A. Wilson FOYER PLEASURE: THE GOLDEN AGE OF CINEMA LOBBY CARDS (New York: Deliliah Books, 1983—$12.95).

Don Graham COWBOYS AND CADILLACS: HOW HOLLYWOOD LOOKS AT TEXAS (Texas Monthly Press, P.O. Box 1569, Austin, Texas 78767—$10.95).     

The role of communication in managing reductions in work force

Reductions in work force (downsizing, delayering, resizing, outplacement, layoffs, demassing) are used by organizations to achieve desired economic goals and ensure survival. However, these reductions often negatively affect the work behaviors and attitudes of continuing employees and thus, may detract from the success of the reduction in work force. The purpose of this study was to increase our understanding of the effects of multiple workforce reductions on survivors by extending Brockner's (1988) model and outlining the role of communication in the process so that researchers and practitioners can better predict and control for the effects of workforce reductions. In pursuit of this goal, a causal model of effects on survivors was developed and then tested with data collected in a large, midwestern insurance company that implemented two workforce reductions.

The hypothesized model was inconsistent with the data and subsequently was rejected. A revised model was then tested and found to fit at three time periods. The revised model demonstrates survivor reactions to reductions are complex and change over time and in response to multiple reductions. The main conclusion was that managers can influence survivor information deprivation, career future uncertainty, work satisfaction, and propensity for turnover by paying attention to, and if possible controlling, organizational identification, financial rewards, work team communication support, and manager communication support. The results also suggest that survivor reactions to prior organizational interventions may influence the success of current interventions.     

Human Movement Forms as Meaning-Structures: Prolegomenon

Economic downturns are sudden and sharp reminders that public universities must shift their reliance on state appropriations to other sources of revenue. The recent economic crisis is another reminder that many sources of revenue must be sought for the continued vitality of public higher education in the United States. The ways and means for producing needed revenue encompass freeing up funds internally through a variety of approaches and creating new revenue streams. Prosperity depends on the creativity of our collective approach to the notion of revenue.