Hemispheric Function in Motor Skill Learning.

Neuropsychological research examining hemispheric function has recently revealed important, and previously unrecognized, perceptual-motor processing advantages in the left and right hemispheres of the brain. This research has also highlighted verbal-motor disruption problems in the performance of motor skills that may be predictable given an understanding of hemispheric specialization and function. Applied research examining methodology to optimize brain functioning in the learning of motor skills has ignored this neuropsychological research. Instead, applied research interest has focussed upon an individual difference phenomenon known as hemisphericity, which affects approximately 25% of the population. An individual presenting hemisphericity appears biased toward a left or right hemisphere processing style regardless of task demands. Previous research has suggested that preferred teaching strategies may be necessary for individuals who present hemisphericity (Murray, 1979). Experiment 1 re-examined this notion in the learning of a juggling skill. The three teaching conditions in this study accounted for the more recent neuropsychological, research findings. The results showed that, contrary to Murray\u27s preferred teaching notion, hemisphericity subjects acquired and retained the skill best in an interhemispheric teaching condition in which both hemispheres were stimulated to contribute to the learning process. Fundamental to the success of the interhemispheric teaching approach is the use of verbal cues designed to limit verbal-motor disruption and to maximize interhemispheric interaction by stimulating both left and right hemisphere perceptual-motor processes. Experiment 2 examined the role of these cues by manipulating the nature of verbal cue structure in learning juggling. The results showed that verbal cues that matched verbal-motor timing, and minimized phonetic difficulty, enhanced the acquisition and retention of the skill. The differential effects found for gender are explained by recourse to basic lateralized cerebral function research. The results of Experiment 2 show that verbal-motor disruption can be overcome with practice and that learning achieved is resistant under transfer conditions. These findings are unique because previous basic research has failed to employ learning paradigms in studying verbal-motor disruption. The discussion that follows considers the basic and applied implications of these findings

Making the case for mobile cognition: EEG and sports performance

In the high stakes world of International sport even the smallest change in performance can make the difference between success and failure, leading sports professionals to become increasingly interested in the potential benefits of neuroimaging. Here we describe evidence from EEG studies that either identify neural signals associated with expertise in sport, or employ neurofeedback to improve performance. Evidence for the validity of neurofeedback as a technique for enhancing sports performance remains limited. By contrast, progress in characterizing the neural correlates of sporting behavior is clear: frequency domain studies link expert performance to changes in alpha rhythms, whilst time-domain studies link expertise in response evaluation and motor output with modulations of P300 effects and readiness potentials. Despite early promise, however, findings have had relatively little impact for sports professionals, at least in part because there has been a mismatch between lab tasks and real sporting activity. After selectively reviewing existing findings and outlining limitations, we highlight developments in mobile EEG technology that offer new opportunities for sports neuroscience

The Effect of Foam Rolling for Three Consecutive Days on Muscular Efficiency and Range of Motion

Background Foam rolling (FR) has been shown to alleviate some symptoms of exercise-induced muscle damage and has been suggested to increase range of motion (ROM) without negatively impacting strength. However, it is unclear what neuromuscular effects, if any, mediate these changes. Methods In a randomized, crossover design, 16 healthy active males completed 2 min of rest or FR of the knee extensors on three consecutive days. Mechanical properties of vastus lateralis (VL) and rectus femoris (RF) were assessed via Tensiomyography. Knee extension maximal voluntary contraction (MVC) and knee flexion ROM were also assessed, and surface electromyography amplitude (RMS) was recorded during a submaximal isometric contraction (50% of MVC). Measures were performed before and after (0, 15, and 30 min) FR or rest. Results MVC was reduced on subsequent days in the rest condition compared to FR (p = 0.002, pη2 = 0.04); ROM was not different across time or condition (p = 0.193, pη2 = 0.01). Stiffness characteristics of the VL were different on the third day of FR (p = 0.002, pη2 = 0.03). RMS was statistically reduced 0, 15, and 30 min after FR compared to rest (p = 0.006, pη2 = 0.03; p = 0.003, pη2 = 0.04; p = 0.002, pη2 = 0.04). Conclusions Following FR, MVC was elevated compared to rest and RMS was transiently reduced during a submaximal task. Excitation efficiency of the involved muscles may have been enhanced by FR, which protected against the decline in MVC which was observed with rest

Reduced Radial Displacement of the Gastrocnemius Medialis Muscle After Electrically Elicited Fatigue

Context: Assessments of skeletal muscle functional capacity often necessitate maximal contractile effort, which exacerbates muscle fatigue or injury. Tensiomyography (TMG) has been investigated as a means to assess muscle contractile function following fatigue; however observations have not been contextualised by concurrent physiological measures. Objective: The aim of the present investigation was to measure peripheral fatigue-induced alterations in mechanical and contractile properties of the plantar flexor muscles through non-invasive TMG concurrently with maximal voluntary contraction (MVC) and passive muscle tension (PMT) in order to validate TMG as a gauge of peripheral fatigue. Design: Pre- and post-test intervention with control. Setting: University laboratory. Participants: Twenty-one healthy male volunteers. Interventions: Subjects plantar flexors were tested for TMG parameters, along with MVC and PMT, before and after either a 5 minute rest period (control) or a 5 minute electrical stimulation intervention (fatigue). Main Outcome Measures: Temporal (contraction velocity) and spatial (radial displacement) contractile parameters of the Gastrocnemius Medialis were recorded through TMG. MVC was measured as an indicator of muscle fatigue and PMT was measured to assess muscle stiffness. Results: Radial displacement demonstrated a fatigue-associated reduction (3.3 ± 1.2 vs. 4.0 ± 1.4 mm vs, p=0.031), while contraction velocity remained unaltered. Additionally, MVC significantly declined by 122.6 ± 104 N (p<0.001) following stimulation (fatigue). PMT was significantly increased following fatigue (139.8 ± 54.3 vs. 111.3 ± 44.6 N, p=0.007).  Conclusion: TMG successfully detected fatigue, evident from reduced MVC, by displaying impaired muscle displacement, accompanied by elevated PMT. TMG could be useful in establishing fatigue status of skeletal muscle without exacerbating the functional decrement of the muscle

Is handicap rating in golf an appropriate measure of putting expertise?

Is handicap rating in golf an appropriate measure of putting expertise

CASE STUDIES OF ASYMMETRIES IN SWIMMING

An interrelated influence of strength, flexibility, anthropometric and technique asymmetries affects performance in swimming. Underpinning aetiologies include both acquired and inherited factors. The combination of factors varies among swimmers and therefore demands a multi-disciplinary case study approach to identify and correct asymmetries to improve performance and reduce incidence of injuries. The purpose of this presentation is to provide examples of analyses informing individualised interventions to correct asymmetries. Interventions comprise programmes of strength, flexibility, posture, and technique refinement. Analyses included measures of strength on the Biodex, measures of strength, posture, flexibility and anthropometry based on the International Society for the Advancement of Kinesiology (ISAK) conventions, and video-based qualitative and quantitative three-dimensional analysis of technique. Sample data of a breaststroke swimmer and a backstroke swimmer are presented to illustrate the interrelationships among strength, flexibility, posture, technique and performance

Gaze behaviours of elite golfers: Does task difficulty influence quiet eye?

Gaze behaviours of elite golfers: Does task difficulty influence quiet eye

Perceptual-cognitive expertise in golf putting

Perceptual-cognitive expertise in golf puttin

Gender differences in temporal relationships between gambling urge and cognitions in treatment-seeking adults

© 2018 Elsevier. This manuscript version is made available under the CC-BY-NC-ND 4.0 license: http://creativecommons.org/licenses/by-nc-nd/4.0/ This author accepted manuscript is made available following 12 month embargo from date of publication (April 2018) in accordance with the publisher’s archiving policyMany gambling-specific CBT programs seek to target either gambling-related urge or cognitions or both. However, little is known of the influence of one symptom type on another across time and whether these differ for men and women help-seeking problem gamblers. The aim of this study was threefold: to determine presence of measurement invariance for urge and cognition measures over time; to investigate the effect of baseline urge on end-of-treatment gambling-related cognitions – and the reciprocal relationship; and, identify whether these pathways differ across gender. Self-reported gambling urge (GUS), and gambling-related cognitions (GRCS) data from treatment-seeking problem gamblers prior to and post treatment (N = 223; 62% men) were analyzed with cross-lagged panel models, moderated by gender. Conceptualization of urge and cognitions were found to be temporally stable. There was no significant association between baseline GUS scores and post-treatment GRCS scores, nor the reverse relationship. Putatively, this infers that coexisting urge and gambling-related cognition components of problem gambling operate independently over time. Analyses revealed gambling urge had a significantly stronger tracking correlation across time for men than women when adjusting for cognition paths. This investigation provides early evidence for tailoring CBT in response to sub-population gambling-related characteristics, demonstrated across men and women