The purpose of the current study was to examine motion enslaving characteristics of multiple fingers during isolated flexion of the distal interphalangeal joints. Because the distal interphalangeal joints are flexed by multiple tendons of the single flexor digitorum profundus, the current experimental design provided a unique advantage to understand inter-finger enslaving effects due to the flexor digitorum profundus. Eight subjects were instructed to flex the distal inter-phalangeal joint of each individual finger from the fully extended position to the fully flexed position as quickly as possible. Maximal angular displacements, velocities, or accelerations of individual fingers were used to calculate the enslaving effects. An independence index, defined as the ratio of the maximal displacement of a master finger to the sum of the maximal displacements of the master and slave fingers, was used to quantify relative independence of each finger. The angular displacements of the index, middle, ring, and little fingers were 68.6° (±7.7), 68.1° (±10.1), 68.1° (±9.7), and 74.7° (±13.3), respectively. The motion of a master finger was invariably accompanied by motion of 1 or 2 slave fingers. Angular displacements of master and slave fingers increased to maximum values with time monotonically. Velocity curves demonstrated bell-shaped profile, and the acceleration curves were sinusoidal. Enslaving effects were generated mainly on the neighboring fingers. The amount of enslaving on the middle and ring fingers exceeded more than 60% of their own maximum angular displacements when a single adjacent finger moved. The index finger had the highest level of independence as indicated by the lowest enslaving effects on other fingers or by other fingers. The independence indices of the index, middle, ring, and little fingers were 0.812 (±0.070), 0.530 (±0.051), 0.479 (±0.099), and 0.606 (±0.148), respectively. In all tasks, motion of slave fingers always lagged with respect to the master finger. Time delays, on average, ranged from 7.8 (±5.0) to 35.9 (±22.1) ms. Our results suggest that there exist relatively large enslaving effects among the compartments of the flexor digitorum profundus, and functional independence of fingers in daily activities is likely enhanced through synergistic activities of multiple muscles, including flexors and extensors.
Zong-Ming Li, Shouchen Dun, Daniel A. Harkness and Teresa L. Brininger
Edwin M. Robertson
The concept of canonical representations within the motor system has been both supported and refuted using a variety of behavioral studies. Here, based upon neurophysiological data, I discuss the relationship amongst those neuronal substrates of action and the behavioral components of a movement. A novel view of reaching and grasping has been proposed which predicts that movements with similar kinematic and dynamic properties have a similar representation within the nervous system (Smeets & Brenner, 1999). However this is broadly inconsistent with a variety of neurophysiological findings that emphasize the independence amongst representations of action.
Edward Archer, Amanda E. Paluch, Robin P. Shook and Steven N. Blair
Successful aging encompasses more than just the prevention of disease and disability; the truly well-lived life is demonstrated by a sense of vitality and independence, freedom from bodily pain, and the continued involvement in meaningful activities. While physical inactivity and sedentary behaviors accelerate the aging process, deliberate exercise and other forms of activity delay and/or prevent the onset of age-related pathologies such as frailty, osteoporosis, sarcopenia, and cardiovascular disease. This review surveys the evidence that supports the position that physical activity is a necessary component for the development and maintenance of the physiological resources that are foundational to physical and cognitive functioning and ‘living well’ in one's later years.
Linda C. Campanelli
Functional mobility is generally considered a major contributor to maintaining quality of life at any age. There are several overviews of physiological aging relative to physical functioning and/or mobility in the recent literature. This paper reiterates the need for continued exercise (at all levels) throughout one’s lifetime, specifically to enhance quality of life and functional independence. Implications for professionals and program development are included. Tailored exercises for both ambulatory and nonambulatory older adults to maintain flexibility, gait, and bed mobility are described.
Donna L. Goodwin, David A. Fitzpatrick, Robin Thurmeier and Carol Hall
This phenomenological study explored the decision-making experience of parents whose children joined Special Olympics programs. The experiences of 16 families with children 10-22 years old were gathered through interviews, artifacts, and field notes. Three themes emerged from the thematic analysis (a) thoughtful instruction, (b) finding the fit, and (c) security of acceptance. Parents sought instructors who were interested in building relationships with their children and creating anxiety-free instructional environments for them. A good program fit occurred when instructors had expectations for motor skill development and increased independence. Parents also preferred environments that encouraged meaningful peer interactions. The findings were interpreted within the context of self-determination theory.
Janet B. Parks and Michael E. Bartley
Scholarship expectations of many universities in the United States are becoming more stringent. The purpose of this study was to examine variables associated with the scholarship of the sport management professoriate. The participants were 266 of the 422 academics in the NASPE-NASSM Sport Management Program List (1991). Chi-square tests of independence (alpha < .004) revealed slight tendencies for (a) younger faculty to have doctorates in areas such as sport management, psychology/sociology of sport, and legal aspects of sport rather than in physical education; (b) younger faculty to have more publications than older faculty; (c) women to be concentrated in the lower ranks and salary ranges; and (d) movement toward gender parity in rank and salary. This study should be replicated in 5 years to discover if these tendencies were precursors of trends.
Jacquelyn Cuneen and M. Joy Sidwell
Internships permit sport management students to link classroom learning to the professional environment. Since internships provide students with opportunities to learn on-the-job and test their skills in the marketplace, the experiences should be uniformly beneficial to all students regardless of gender. This study was conducted to describe internship work conditions (i.e., opportunities to perform in essential marketplace functions) for male and female sport management interns assigned to ‘Big Four’ professional sport organizations. Participants were 74 sport industry professionals who supervised a total of 103 interns over a one-year period. A X2 Test of Independence found that male and female interns working in professional sport had comparable opportunities to perform and learn on the job. Differences in opportunity, hiring practices, and on-the-job benefits emerged primarily as a function of job specialization (e.g., operations, marketing, venue management), league/association, or gender of the internship supervisor rather than gender of the interns.
Christie L. Ward, Rudy J. Valentine and Ellen M. Evans
Adiposity, lean mass, and physical activity (PA) are known to influence physical function in older adults, although the independent influences are not completely characterized. Older adults (N = 156, M age = 68.9 ± 6.7 yr, 85 men) were assessed for body composition via dual-energy X-ray absorptiometry, PA by accelerometer, and physical function via timed up-and-go (UP&GO), 30-s chair stand, 6-min walk (6-min WALK), and Star-Excursion Balance Test. In the absence of percentage-body-fat by PA interactions (p > .05), main effects existed such that a higher percentage body fat was associated with poorer performance in UP&GO, 30-s chair stand, and 6-min WALK (p < .05). No significant main effects were found for PA and functional performance. Adiposity explains 4.6–11.4% in physical functional variance (p < .05). Preventing increases in adiposity with age may help older adults maintain functional independence.
Kathleen Benjamin, Nancy C. Edwards and Virendra K. Bharti
For seniors, an inactive lifestyle can result in declines in mental and physical functioning, loss of independence, and poorer quality of life. This cross-sectional descriptive study examined theory-of-planned-behavior, health-status, and sociodemographic predictors on exercise intention and behavior among 109 older and physically frail adults. Significant predictors of being a high versus a low active were a strong intention to continue exercising, positive indirect attitudes about exercise, and having been advised by a doctor to exercise. Findings indicate that a strong intention to continue exercising differentiates between those who report low levels and those who report high levels of physical activity. The results also highlight the salience of physician’s advice for seniors to exercise.
Garry D. Wheeler
The biological area of adapted physical activity research has traditionally been dominated by the positivist or rational empirical paradigm, or the scientific method. Underlying assumptions of the inquirer and inquired’s objectivity and independence have generated much criticism. Researchers have argued that the scientific method produces an impoverished view of reality and that claims to an objective and value-free stance are ideological and mythical. Critique of rational-empiricism, the scientific method, present science, or the received-view may be understood at three levels: intraparadigmatic, extraparadigmatic, and intramethod. Dr. Shephard (1998) addresses the latter in his paper and as such, his is a method-based approach. A methodological analysis, however, requires examining the underlying tacit assumptions of the scientific method. In this paper, critique of the scientific method is offered and justification of the critique examined. Proposed alternatives include an expansionist view of research, inclusion of subjective elements, triangulated designs, and empowerment of subjects.