Wheelchair sport: pushing from Atlanta to Rio, the sports science journey

In order to develop and implement safe and effective training programmes for a wheelchair athlete an understanding of the physical impairment is essential. This article will focus on the wheelchair athlete to describe how the training prescription for the non-disabled may be challenged in terms of its use for athletes with a spinal cord injury (SCI); describe the approach taken to optimise wheelchair set-up and finally describe how a multi-disciplinary sports science team prepares athletes for competition in the heat

A security proof of continuous-variable QKD using three coherent states

We introduce a ternary quantum key distribution (QKD) protocol and asymptotic security proof based on three coherent states and homodyne detection. Previous work had considered the binary case of two coherent states and here we nontrivially extend this to three. Our motivation is to leverage the practical benefits of both discrete and continuous (Gaussian) encoding schemes creating a best-of-both-worlds approach; namely, the postprocessing of discrete encodings and the hardware benefits of continuous ones. We present a thorough and detailed security proof in the limit of infinite signal states which allows us to lower bound the secret key rate. We calculate this is in the context of collective eavesdropping attacks and reverse reconciliation postprocessing. Finally, we compare the ternary coherent state protocol to other well-known QKD schemes (and fundamental repeaterless limits) in terms of secret key rates and loss.Comment: Close to the published versio

Perspective: Does laboratory-based maximal incremental exercise testing elicit maximum physiological responses in highly-trained athletes with cervical spinal cord injury?

The physiological assessment of highly-trained athletes is a cornerstone of many scientific support programs. In the present article, we provide original data followed by our perspective on the topic of laboratory-based incremental exercise testing in elite athletes with cervical spinal cord injury. We retrospectively reviewed our data on Great Britain Wheelchair Rugby athletes collected during the last two Paralympic cycles. We extracted and compared peak cardiometabolic (heart rate and blood lactate) responses between a standard laboratory-based incremental exercise test on a treadmill and two different maximal field tests (4 min and 40 min maximal push). In the nine athletes studied, both field tests elicited higher peak responses than the laboratory-based test. The present data imply that laboratory-based incremental protocols preclude the attainment of true peak cardiometabolic responses. This may be due to the different locomotor patterns required to sustain wheelchair propulsion during treadmill exercise or that maximal incremental treadmill protocols only require individuals to exercise at or near maximal exhaustion for a relatively short period of time. We acknowledge that both field- and laboratory-based testing have respective merits and pitfalls and suggest that the choice of test be dictated by the question at hand: if true peak responses are required then field-based testing is warranted, whereas laboratory-based testing may be more appropriate for obtaining cardiometabolic responses across a range of standardized exercise intensities.The Great Britain Wheel chair Rugby squa

Current perspectives on profiling and enhancing wheelchair court-sport performance

Despite the growing interest in Paralympic sport, the evidence-base for supporting elite wheelchair sport performance remains in its infancy when compared to able-bodied (AB) sport. Subsequently, current practice is often based on theory adapted from AB guidelines, with a heavy reliance on anecdotal evidence and practitioner experience. Many principles in training prescription and performance monitoring with wheelchair athletes are directly transferable from AB practice, including the periodisation and tapering of athlete loads around competition. Yet, a consideration for the physiological consequences of an athlete’s impairment and the interface between athlete and their equipment are vital when targeting interventions to optimise in-competition performance. Researchers and practitioners are faced with the challenge of identifying and implementing reliable protocols that detect small but meaningful changes in impairment-specific physical capacities and on-court performance. Technologies to profile both linear and rotational on-court performance are an essential component of sports science support in order to understand sport-specific movement profiles and prescribe training intensities. In addition, an individualised approach to the prescription of athlete training and optimisation of the ‘wheelchair/user interface’ is required, accounting for an athlete’s anthropometrics, sports classification and positional role on court. As well as enhancing physical capacities, interventions must also focus on the integration of the athlete and their equipment as well as techniques for limiting environmental influence on performance. Taken together, the optimisation of wheelchair sport performance requires a multi-disciplinary approach based on the individual requirements of each athlete

Thermoregulation during intermittent exercise in athletes with a spinal-cord injury

Purpose: Individuals with a spinal-cord injury have impaired thermoregulatory control due to a loss of sudomotor and vasomotor effectors below the lesion level. Thus, individuals with high-level lesions (tetraplegia) possess greater thermoregulatory impairment than individuals with lower-level lesions (paraplegia). Previous research has not reflected the intermittent nature and modality of wheelchair court sports or replicated typical environmental temperatures. Hence, the purpose of this study was to investigate the thermoregulatory responses of athletes with tetraplegia and paraplegia during an intermittent-sprint protocol (ISP) and recovery in cool conditions. Methods: Sixteen wheelchair athletes, 8 with tetraplegia (TP, body mass 65.2 ± 4.4 kg) and 8 with paraplegia (body mass 68.1 ± 12.3 kg), completed a 60-min ISP in 20.6°C ± 0.1°C, 39.6% ± 0.8% relative humidity on a wheelchair ergometer, followed by 15 min of passive recovery. Core temperature (Tcore) and mean (Tsk) and individual skin temperatures were measured throughout. Results: Similar external work (P = .70, ES = 0.20) yet a greater Tcore (P < .05, ES = 2.27) and Tsk (P < .05, ES = 1.50) response was demonstrated by TP during the ISP. Conclusions: Despite similar external work, a marked increase in Tcore in TP during exercise and recovery signifies that thermoregulatory differences between the groups were predominantly due to differences in heat loss. Further increases in thermal strain were not prevented by the active and passive recovery between maximal-effort bouts of the ISP, as Tcore continually increased throughout the protocol in TP

A PLURALIST THEORY OF AGE DISCRIMINATION

PhDThis thesis aims to provide a comprehensive theory of age discrimination that can guide the direct and indirect age discrimination provisions of the Equality Act 2010. The Act holds that unequal treatment on the grounds of age and measures that are on their face age-neutral but have the effect of disadvantaging particular age groups are lawful only if the treatment can be shown either to be a ‘proportionate means of achieving a legitimate aim’ or if the treatment fits into a specifically prescribed exception. In this way, the proportionality test distinguishes justified and unjustified age-differential treatment with only the former legally permissible. I outline and defend a pluralist theory of age discrimination that assists in making the distinction between justified and unjustified age-differential treatment. The theory identifies the principles that explain when and why age-differential treatment wrongs people and the principles that can justify this treatment. It is a pluralist theory because it recognises that age-differential treatment can wrong people for a number of different, overlapping reasons, and these different reasons should inform how we apply age discrimination law. The pluralist theory of age discrimination theory can improve legal reasoning in age discrimination cases by articulating the relevant principles and competing interests that are at stake in age discrimination claims. In constructing the theory, I adopt the reflective equilibrium method. This requires that I ‘test’ my starting moral intuitions against other beliefs, seeking coherence among these beliefs, and revising the beliefs as a result of particular challenges to them. In applying this method, I identify the following five principles to form a pluralist theory of age discrimination: equality of opportunity, social equality, respect, autonomy and efficiency

Creating Immersion: A Semiotic and Compositional Insight into the Promotion of Immersion through Video-Game Soundtracks

This thesis identifies key criteria of how immersion can be promoted and induced through musical functions within soundtracks of video-games. The thesis is the primary component of the research offering a usable framework tool for composers and researchers when composing, or analysing, a video-game soundtrack. Popular and well supported immersion theories are presented to identify similarities and differences between approaches to immersion. Links between the most suitable theories are outlined whilst forming an immersion framework, used for the analysis of the case study: Journey (2012). Two scenes from Journey are examined in detail and analysed through the created framework, identifying the successful compositional techniques that aid the induction and promotion of immersion, through the soundtracks support of the narrative, controls and game design. This designed framework helps structure the analysis, as well as provide a more insightful method of dissecting the phenomenology of the player’s response. The thesis is accompanied with an original composition, scored for Limbo (2010), and was created with the framework to act as proof of concept. The score is self-analysed, identifying its effectiveness whilst expanding on compositional and technical strategies employed