Trial by fire: One perspective for guessing

Guessing correct answers to test items is a statistical concept that has direct impact when interpreting test scores. Many published tests, however, do not account for guessing. This is an important issue in view of recent federal legislation in the United States and global attention mandating the provision of identification of at-risk children for educational services. Children may score within a normal range by chance alone, resulting in test scores that are not sensitive. The purpose of this paper, therefore, is: (a) to describe one process, random guessing, for estimating a “true blind guessing score” (range of scores) that, if known, would result in missing fewer at-risk children; and (b) to sensitize test administrators to tests that do not address or may have suspicious corrections for guessing answers on tests.     

The relationships between exercise intensity, heart rate, and blood pressure during an incremental isometric exercise test

Currently, it is not possible to prescribe isometric exercise at an intensity that corresponds to given heart rates or systolic blood pressures. This might be useful in optimizing the effects of isometric exercise training. Therefore, the aim of this study was to explore the relationships between isometric exercise intensity and both heart rate and systolic blood pressure during repeated incremental isometric exercise tests. Fifteen participants performed seated isometric double-leg knee extension, during which maximum voluntary contraction (MVC) was assessed, using an isokinetic dynamometer. From this, a corresponding peak electromyographic activity (EMG(peak)) was determined. Subsequently, participants performed two incremental isometric exercise tests (at least 48 h apart) at 10, 15, 20, 25, and 30% EMG(peak), during which steady-state heart rate and systolic blood pressure were recorded. In all participants, there were linear relationships between %EMG(peak) and heart rate (r at least 0.91; P < 0.05) and between %EMG(peak) and systolic blood pressure (r at least 0.92; P < 0.05). Also, when repeated tests were compared, there were no differences in the slopes (P > 0.50) or elevations (P > 0.10) for either of the relationships. Therefore, these linear relationships could be used to identify isometric exercise training intensities that correspond to precise heart rates or systolic blood pressures. Training performed in this way might provide greater insight into the underlying mechanisms for the cardiovascular adaptations that are known to occur as a result.     

Psychosocial correlates of cardiorespiratory fitness and muscle strength in overweight and obese post-menopausal women: a MONET study

The purpose of this study was to examine the psychosocial correlates of cardiorespiratory fitness (VO2peak) and muscle strength in overweight and obese sedentary post-menopausal women. The study population consisted of 137 non-diabetic, sedentary overweight and obese post-menopausal women (mean age 57.7 years, s = 4.8; body mass index 32.4 kg.m(-2), s = 4.6). At baseline we measured: (1) body composition using dual-energy X-ray absorptiometry; (2) visceral fat using computed tomography; (3) insulin sensitivity using the hyperinsulinaemic-euglycaemic clamp; (4) cardiorespiratory fitness; (5) muscle strength using the leg press exercise; and (6) psychosocial profile (quality of life, perceived stress, self-esteem, body-esteem, and perceived risk for developing chronic diseases) using validated questionnaires. Both VO2peak and muscle strength were significantly correlated with quality of life (r = 0.29, P < 0.01 and r = 0.30, P < 0.01, respectively), and quality of life subscales for: physical functioning (r = 0.28, P < 0.01 and r = 0.22, P < 0.05, respectively), pain (r = 0.18, P < 0.05 and r = 0.23, P < 0.05, respectively), role functioning (r = 0.20, P < 0.05 and r = 0.24, P < 0.05, respectively), and perceived risks (r = -0.24, P < 0.01 and r = -0.30, P < 0.01, respectively). In addition, VO2peak was significantly associated with positive health perceptions, greater body esteem, and less time watching television/video. Stepwise regression analysis showed that quality of life for health perceptions and for role functioning were independent predictors of VO2peak and muscle strength, respectively. In conclusion, higher VO2peak and muscle strength are associated with a favourable psychosocial profile, and the psychosocial correlates of VO2peak were different from those of muscle strength. Furthermore, psychosocial factors could be predictors of VO2peak and muscle strength in our cohort of overweight and obese sedentary post-menopausal women.     

Reliability and concurrent validity of light's retention scale

Light's Retention Scale was completed for 123 candidates to repeat the first grade. These same first-grade children were tested with a number of measures of maturity, including achievement tests, measures of intellectual functioning, visual-motor integration, self-concept, and physical maturity. Results indicated that Light's total score is not sufficiently reliable and has little concurrent validity for making retention decisions. The total score should never be used.     

Partial swing golf shots: scaled from full swing or independent technique?

Abstract

During practice and competition, golfers are required to use submaximal effort to hit the ball a given distance, i.e., perform a partial shot. While the full golf swing has undergone extensive research, little has addressed partial shots and the biomechanical modifications golfers employ. This study investigates the biomechanical changes between full and partial swings, and determines if the partial swing is a scaled version of the full swing. Using a repeated measures design, 13 male golfers completed a minimum of 10 swings in the full and partial swing conditions, whilst club, ball, kinematic, and kinetic parameters were recorded. Large and statistically significant reductions in body motion (centre of pressure ellipse: 33.0%, p = 0.004, d = 2.26), combined with moderate reductions in lateral shift (25.5%, p = 0.004, d = 0.33) and smaller reductions in trunk rotation (arm to vertical at top of backswing: 14.1%, p = 0.002, d = 2.58) indicate golfers favour larger reductions in proximal measures, combined with diminished reductions as variables moved distally. Furthermore, the partial swing was not found to be a scaled version of the full swing implying a new approach to coaching practices might be considered.     

Instruments for evaluating school psychologists' functioning and service

The evaluation of school psychological services is both a responsibility and an opportunity too long ignored. Unique problems must be overcome in evaluating school psychologists, but the task is not insurmountable. This paper describes and presents examples of five data collection devices which can be used in the evaluation effort: the vignette-based questionnaire, the role-model questionnaire, the services received questionnaire, the teacher interview, and nonobtrusive measurement.     

A high school follow-up of children who were nonpromoted or attended a junior first grade

The purpose of this study was to evaluate the long-term effects of repeating a grade or participating in a junior first-grade program. High school students (N = 137) answered a questionnaire concerning their experience with grade retention or a transitional year while in elementary school. In addition, we collected data on past academic performance from the students' school records. Groups of students were composed of former participants in the junior first program, students who had been retained in a grade, and matched controls. Attitudes towards nonpromotion and the junior first program were positive and, among all three groups, there were few important differences in opinion. In high school, however, measures of academic competence indicated there were performance differences between the groups. Participants in the junior first program were at par with peers, whereas grade repeaters made less progress in high school and had lower mathematics grades. The later in school the grade retention, the poorer the academic performance.     

Influence of wheel size on muscle activity and tri-axial accelerations during cross-country mountain biking

ABSTRACT

This study aimed to investigate the influence of different mountain bike wheel diameters on muscle activity and whether larger diameter wheels attenuate muscle vibrations during cross-country riding. Nine male competitive mountain bikers (age 34.7 ± 10.7 years; stature 177.7 ± 5.6 cm; body mass 73.2 ± 8.6 kg) participated in the study. Riders performed one lap at race pace on 26, 27.5 and 29 inch wheeled mountain bikes. sEMG and acceleration (RMS) were recorded for the full lap and during ascent and descent phases at the gastrocnemius, vastus lateralis, biceps brachii and triceps brachii. No significant main effects were found by wheel size for each of the four muscle groups for sEMG or acceleration during the full lap and for ascent and descent (P > .05). When data were analysed between muscle groups, significant differences were found between biceps brachii and triceps brachii (P < .05) for all wheel sizes and all phases of the lap with the exception of for the 26 inch wheel during the descent. Findings suggest wheel diameter has no influence on muscle activity and vibration during mountain biking. However, more activity was observed in the biceps brachii during 26 inch wheel descending. This is possibly due to an increased need to manoeuvre the front wheel over obstacles.     

Western Medicine for the Masters of Damascus: Benvenutus Grapheus's Experimenta

This article examines a rediscovered work by the thirteenth-century physician Benvenutus Grapheus de Iherusalem. Surviving only in a late medieval German translation, it contains select recipes and medical procedures. The study of this compilation offers new insight into two important aspects of Benvenutus's life: It provides a more precise dating for his activities, and clarifies at least one facet of his connection to the Levant. An analysis of Benvenutus's sources, most notably the Antidotarium Nicolai but also the Circa instans, confirms the assumption of previous scholars that he had studied at the Salernitan school of medicine. This article also shows that, at least in this particular case, practitioners trained within the Arabic medical tradition did not view Western medicine as a priori inferior.