Small fish,big pond: The role of health-related fitness and perceived athletic competence in mediating the physical activity-motor competence relationship during the transition from primary to secondary school

ABSTRACT

This study investigates the role of Perceived Athletic Competence (PAC) and Health-Related Fitness (HRF) in mediating the reciprocal relationship between Motor Competence (MC) and Physical Activity (PA) during the transition from primary to secondary school. MC, PA, PAC and HRF were measured in 224 participants (baseline age 12.26 ± .037 years; 51% female) in final year of primary school and one year later in first year of secondary school. Path analysis in AMOS 23 was used to test the mediating influence of PAC and HRF on the MC-PA relationship. Fit indices showed that, in both directions, HRF and PAC mediated the relationship between MC and PA (PA predicting MC; χ2 = 3.91, p = .272, CFI = .99, RMSEA = .04. MC predicting PA: χ2 = 6.46, p = .167, CFI = .99, RMSEA = .04). Pathways were stronger through HRF than through PAC, indicating that HRF is the more substantial mediator of the MC-PA relationship during the school transition. Pathways were stronger in the direction of PA predicting MC than in the reverse direction. Interventions seeking to influence PA and MC across the school transition should focus on HRF as it is a primary mediator of the MC-PA relationship.     

Variations in observation frequency in a self-controlled learning environment do not modulate learning of a pirouette en dehors

ABSTRACT

Little is known about the optimal frequency to observe a skilled model, yet this is potentially an important learning variable, and thus was examined in the context of self-controlled learning conditions. Participants chose the schedule in which they interspersed both physical and observational trials of a dance skill. The participants’ choice, however, was governed by an imposed observation frequency (OF) of either 25%, 50%, or 75%. Participants were in one of these OF groups, in addition to another group in which no constraint was put on OF. This last group was predicted to choose an OF of 10%, however, it was determined that they chose a 50% schedule. Consequently, a 10% OF group was added to the experimental protocol. All participants completed a pre-test, followed by an acquisition phase, and then a 24-hr post-test. Physical performance (F(1, 55) = 143.77, p< .001) and cognitive representation (F(1, 55) = 77.68, p< .001) scores both revealed a significant main effect of Test; scores at post-test were higher than those at pre-test. Thus, learning was demonstrated for both measures. No main effect of Group emerged. Consequently, OF varying from 10% to 75%, under self-controlled conditions, were equally beneficial for learning the dance skill.     

The Visual Instruction System

Abstract

Three experimental groups of 45 S's each were given 30 repeated isometric wrist flexion trials. Each trial consisted of a maximal 5-sec. effort followed by a rest period of 5,10, or 20 sec. In each recuperation group S's were divided into subgroups representing high, middle, and low levels of absolute strength. The data were analyzed by an analysis of variance of trends allowing statistical tests for best fitting trend components and trend differences between subgroups. Low level of strength groups always demonstrated a fatigue pattern significantly different from high and middle levels. High and middle levels displayed similar patterns differing only on absolute level of strength. Caution isefore indicated in definition and magnitude assessment of derived curve components based upon composite fatigue curves secured on unknown levels of strength. It seems unlikely that the same factors responsible for muscular fatigue can be operating in the same manner at different levels of isometric strength.     

The effects of arm crank strategy on physiological responses and mechanical efficiency during submaximal exercise

Abstract

The purpose of this study was to compare submaximal physiological responses and indices of mechanical efficiency between asynchronous and synchronous arm ergometry. Thirteen wheelchair-dependent trained athletes performed eight steady-state incremental bouts of exercise (0 to 140 W), each lasting 4 min, using synchronous and asynchronous arm-cranking strategies. Physiological measures included oxygen uptake ([Vdot]O₂), heart rate, and blood lactate concentration. The power outputs corresponding to fixed whole blood lactate concentrations of 2.0 to 4.0 mmol · l^?1 were calculated using linear interpolation. Mechanical efficiency indices – gross efficiency, net efficiency, and work efficiency – were also calculated. An analysis of variance with repeated measures was applied to determine the effect of crank mode on the physiological parameters. Oxygen uptake was on average 10% lower (P < 0.01), and both net efficiency (P < 0.01) and gross efficiency (P < 0.01) were higher, during the asynchronous strategy at both 60 and 80 W (gross efficiency: 16.9 ± 2.0% vs. 14.7 ± 2.4% and 17.5 ± 1.8% vs. 15.9 ± 2.6% at 60 and 80 W respectively). There were no differences in heart rate, blood lactate concentration or power output at either of the blood lactate reference points between the asynchronous and synchronous strategies (P > 0.05). In conclusion, test specificity is an important consideration. If a synchronous strategy is to be adopted, it is likely to result in lower efficiency than an asynchronous strategy. The exercise testing scenario may help dictate which method is ultimately chosen.     

Observation and Classification of Prehension in Preschool Children: A Reliability Study

Abstract

Changes were observed in the thickness of a subcutaneous fat layer as a result of exercising an underlying unilateral muscle over a period of time using the subcutaneous fat layer over the inactive contralateral muscle as a control. The observations were made on 15 male subjects who participated in a ten-week weight-training program which involved the triceps of the dominant arm. A Harpenden skinfold caliper was used to estimate the thickness of the subcutaneous fat layers. The findings did not support the postulate that subcutaneous fat is reduced in localities where muscles are active and in proportion to their activity.     

Effects of a Three-Year Exercise Program on Motor Function and Cognitive Processing Speed in Older Women

Abstract

This study evaluated the effects of a three-year exercise program on motor performance and cognitive processing speed of previously sedentary older women, ages 57–85. Variables tested were simple and choice reaction time (CRT), balance, sit and reach flexibility, shoulder flexibility, and grip strength. Subjects participated three times a week in exercise performance classes designed to meet American College of Sports Medicine guidelines. Results indicate that performance was significantly improved on all measures during the course of the study (p < .01) except for the sit and reach test (SRT), where significance was approached (p < .027), but not reached. A comparison of the exercise subjects with a comparable group of nonexercising control subjects revealed significant interactions between treatment and time on all variables except CRT and grip strength. Pretest to posttest scores of the exercise subjects tended to improve over the three-year period, whereas the scores of the control subjects declined. Improved reaction time indicated exercise is effective in reversing or at least slowing certain age-related declines in motor performance and in speed of cognitive processing.     

Item Response Theory and the Measurement of Motor Behavior

Abstract

Item response theory (IRT) has been the focus of intense research and development activity in educational and psychological measurement during the past decade. Because this theory can provide more precise information about test items than other theories usually used in measuring motor behavior, the application of IRT in physical education and exercise science merits investigation. In IRT, the difficulty level of each item (e.g., trial or task) can be estimated and placed on the same scale as the ability of the examinee. Using this information, the test developer can determine the ability levels at which the test functions best. Equating the scores of individuals on two or more items or tests can be handled efficiently by applying IRT. The precision of the identification of performance standards in a mastery test context can be enhanced, as can adaptive testing procedures. In this tutorial, several potential benefits of applying IRT to the measurement of motor behavior were described. An example is provided using bowling data and applying the graded-response form of the Rasch IRT model. The data were calibrated and the goodness of fit was examined. This analysis is described in a step-by-step approach. Limitations to using an IRT model with a test consisting of repeated measures were noted.     

Teacher versus Peer Models Revisited: Effects on Motor Performance and Self-Efficacy

Abstract

This study reinvestigated and extended the findings of Landers and Landers (1973), which examined the influence of skilled and unskilled teacher and peer models on motor performance. Sixth grade females (N = 100) were randomly assigned to groups in a 2 × 2 (Model Type × Model Skill) factorial design or to a no-model group. In the treatment groups, subjects observed one of four unfamiliar models—(a) a skilled teacher, (b) an unskilled teacher, (c) a skilled peer, or (d) an unskilled peer—perform on the Bachman ladder task. Subjects performed 30 trials of the task and also completed self-efficacy questionnaires on three occasions. Results showed that subjects who watched a skilled model performed better than subjects who watched an unskilled model. Unlike the Landers and Landers study, no model type by model skill interaction was found. In addition, the skilled model group reported higher efficacy beliefs than the control group after performing and were more efficacious than the unskilled model subjects both after watching the model and after performing. These results suggest when students view unfamiliar models, the skill rather than the status of the model may be more salient.     

The locus of focus: The effect of switching from a preferred to a non-preferred focus of attention

Abstract

Focusing strategies are known to play a significant role in motor performance, with individuals who use an internal focus on body movement typically showing poorer outcomes than those who focus on features of the external environment. Focus of attention and switching of one's focus are examined in the context of two different complex motor skills along with a factor not previously examined systematically, individual preference. In both experiments, participants were introduced to focusing strategies that might be employed when attempting a sensorimotor task. Explanations of both strategies were given to participants. Specifically, for an internal focus, participants were instructed to concentrate on their body movements, while for an external focus, they were instructed to focus on aspects in the environment. They were then asked which strategy they preferred. Participants then continued either with their preferred focus or were instructed to switch to their non-preferred focus. The advantage that the external focus typically enjoys turns out not to be a simple one and interacts with individual preference and with the “forced-opposite” manipulation. Our results support the growing consensus that encouraging individuals to adopt an internal focusing strategy is counterproductive in complex sensorimotor tasks. They also suggest that individual preferences play a role.     

Motor adaptation in complex sports – The influence of visual context information on the adaptation of the three-point shot to altered task demands in expert basketball players

Abstract

We examined the influence of visual context information on skilled motor behaviour and motor adaptation in basketball. The rules of basketball in Europe have recently changed, such that that the distance for three-point shots increased from 6.25 m to 6.75 m. As such, we tested the extent to which basketball experts can adapt to the longer distance when a) only the unfamiliar, new three-point line was provided as floor markings (NL group), or b) the familiar, old three-point line was provided in addition to the new floor markings (OL group). In the present study 20 expert basketball players performed 40 three-point shots from 6.25 m and 40 shots from 6.75 m. We assessed the percentage of hits and analysed the landing position of the ball. Results showed better adaptation of throwing performance to the longer distance when the old three-point line was provided as a visual landmark, compared to when only the new three-point line was provided. We hypothesise that the three-point line delivered relevant information needed to successfully adapt to the greater distance in the OL group, whereas it disturbed performance and ability to adapt in the NL group. The importance of visual landmarks on motor adaptation in basketball throwing is discussed relative to the influence of other information sources (i.e. angle of elevation relative to the basket) and sport practice.