The specificity of training for races is believed to be important for performance development. However, measuring specificity is challenging. This study aimed to develop a method to quantify the specificity of speed skating training for sprint races (i.e., 500 and 1,000 m), and explore the amount of training specificity with a pilot study. On-ice training and races of 10 subelite-to-elite speed skaters were analyzed during 1 season (i.e., 26 weeks). Intensity was mapped using 5 equal zones, between 4 m·s-1 to peak velocity and 50% to peak heart rate. Training specificity was defined as skating in the intensity zone most representative for the race for a similar period as during the race. During the season, eight 500 m races, seven 1,000 m races, and 509 training sessions were analyzed, of which 414 contained heart rate and 375 sessions contained velocity measures. Within-subject analyses were performed. During races, most time was spent in the highest intensity zone (Vz5 and HRz5). In training, the highest velocity zone Vz5 was reached 107 ± 28 times, with 9 ± 3 efforts (0.3 ± 0.1% training) long enough to be considered 500 m specific, 6 ± 5 efforts (0.3 ± 0.3% training) were considered 1,000 m specific. For heart rate, HRz5 was reached 151 ± 89 times in training, 43 ± 33 efforts (1.3 ± 0.9% training) were considered 500 m specific, and 36 ± 23 efforts (3.2 ± 1.7% training) were considered 1,000 m specific. This newly developed method enables the examination of training specificity so that coaches can control whether their intended specificity was reached. It also opens doors to further explore the impact of training specificity on performance development.
The relationship between race and biology is complex. In contemporary medical science, race is a social construct that is measured via self-identification of study participants. But even though race has no biological essence, it is often used as variable in medical guidelines (e.g., treatment recommendations specific for Black people with hypertension). Such recommendations are based on clinical trials in which there was a significant correlation between self-identified race and actual, but often unmeasured, health-related factors such as (pharmaco) genetics, diet, sun exposure, etc. Many teachers are insufficiently aware of this complexity. In their classes, they (unintentionally) portray self-reported race as having a biological essence. This may cause students to see people of shared race as biologically or genetically homogeneous, and believe that race-based recommendations are true for all individuals (rather than reflecting the average of a heterogeneous group). This medicalizes race and reinforces already existing healthcare disparities. Moreover, students may fail to learn that the relation between race and health is easily biased by factors such as socioeconomic status, racism, ancestry, and environment and that this limits the generalizability of race-based recommendations. We observed that the clinical case vignettes that we use in our teaching contain many stereotypes and biases, and do not generally reflect the diversity of actual patients. This guide, written by clinical pharmacology and therapeutics teachers, aims to help our colleagues and teachers in other health professions to reflect on and improve our teaching on race-based medical guidelines and to make our clinical case vignettes more inclusive and diverse.
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Artikel gepubliceerd in NTvG: Richtlijnen geven soms aan dat je iemands huidskleur of afkomst mee moet laten spelen bij de afwegingen over een behandeling. Een bekend voorbeeld hiervan zijn de specifieke behandeladviezen voor ‘zwarte personen’ met hypertensie. Wij gingen na hoe bruikbaar dit onderscheid is in de Nederlandse situatie. Elders in het NTvG leest u dat onderscheid maken soms nodig is om goede zorg te verlenen.1 De NHG-standaard ‘Cardiovasculair risicomanagement’ adviseert, net als belangrijke internationale richtlijnen, om ‘zwarte personen’ met hypertensie bij wie geen duidelijke voorkeur is voor een specifiek antihypertensivum op basis van bijvoorbeeld zwangerschap, hartfalen of albuminurie, anders te behandelen dan niet-zwarte personen.2,3 Wij zochten uit hoe bruikbaar dit advies is in de Nederlandse spreekkamer. De term ‘zwart’ Om deze vraag te beantwoorden is het noodzakelijk om eerst terminologie te verhelderen. In de NHG-standaard wordt de term ‘zwarte personen’ gebruikt, maar wie zijn dat eigenlijk? Zijn dat alle mensen ‘van kleur’ (met een niet-witte huidskleur of identiteit), of gaat het dan om iedereen met huidtype 5 of 6 volgens de Fitzpatrick-indeling (5: diepbruin, verbrandt bijna nooit; 6: zeer donkerbruin tot zwart, verbrandt nooit)?
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Recycling of plastics plays an important role to reach a climate neutral industry. To come to a sustainable circular use of materials, it is important that recycled plastics can be used for comparable (or ugraded) applications as their original use. QuinLyte innovated a material that can reach this goal. SmartAgain® is a material that is obtained by recycling of high-barrier multilayer films and which maintains its properties after mechanical recycling. It opens the door for many applications, of which the production of a scoliosis brace is a typical example from the medical field. Scoliosis is a sideways curvature of the spine and wearing an orthopedic brace is the common non-invasive treatment to reduce the likelihood of spinal fusion surgery later. The traditional way to make such brace is inaccurate, messy, time- and money-consuming. Because of its nearly unlimited design freedom, 3D FDM-printing is regarded as the ultimate sustainable technique for producing such brace. From a materials point of view, SmartAgain® has the good fit with the mechanical property requirements of scoliosis braces. However, its fast crystallization rate often plays against the FDM-printing process, for example can cause poor layer-layer adhesion. Only when this problem is solved, a reliable brace which is strong, tough, and light weight could be printed via FDM-printing. Zuyd University of Applied Science has, in close collaboration with Maastricht University, built thorough knowledge on tuning crystallization kinetics with the temperature development during printing, resulting in printed products with improved layer-layer adhesion. Because of this knowledge and experience on developing materials for 3D printing, QuinLyte contacted Zuyd to develop a strategy for printing a wearable scoliosis brace of SmartAgain®. In the future a range of other tailor-made products can be envisioned. Thus, the project is in line with the GoChem-themes: raw materials from recycling, 3D printing and upcycling.
Despite Dutch Hospitality industry’s significant economic value, employers struggle to attract and retain early career professionals at a time when tourism is forecasted to grow exponentially (Ruël, 2018). Universally, hospitality management graduates are shunning hospitality careers preferring other career paths; stimulating the Dutch Hospitality to find innovative ways of attracting and retaining early career professionals. Following calls from the Human Resource Management (HRM) community (Ehnert, 2009), we attribute this trend to personnel being depicted as rentable resources, driving profit’’ often at personal expense. For example, hotels primarily employ immigrants and students for a minimum wage suppressing salaries of local talent (Kusluvan, et al 2010, O’Relly and Pfeffer, 2010). Similarly, flattening organizational structures have eliminated management positions, placing responsibility on inexperienced shoulders, with vacancies commonly filled by pressured employees accepting unpaid overtime jeopardizing their work life balance (Davidson, et al 2010,). These HRM practices fuel attrition by exposing early career professionals to burnout (Baum et al, 2016, Goh et al, 2015, Deery and Jog, 2009). Collectively this has eroded the industry’s employer brand, now characterized by unsocial working hours, poor compensation, limited career opportunities, low professional standing, high turnover and substance abuse (Mooney et al, 2016, Gehrels and de Looij, 2011). In contrast, Sustainable HRM “enables an organizational goal achievement while simultaneously reproducing the human resource base over a long-lasting calendar time (Ehnert, 2009, p. 74).” Hence, to overcome this barrier we suggest embracing the ROC framework (Prins et al, 2014), which (R)espects internal stakeholders, embraces an (O)pen HRM approach while ensuring (C)ontinuity of economic and societal sustainability which could overcome this barrier. Accordingly, we will employ field research, narrative discourse, survey analysis and quarterly workshops with industry partners, employees, union representatives, hotel school students to develop sustainable HRM practices attracting and retaining career professionals to pursue Dutch hospitality careers.
Door de grote ontwerpvrijheid van 3D printen heeft het de belofte om echte maatwerkproducten te creëren. Zo biedt het grote kansen voor het maken van poreuze, en dus lichtgewicht, structuren. In vergelijking met traditionele schuimen, waar de porositeit moeilijk te beïnvloeden is, kan met 3D printen de poreuze structuur geheel gecontroleerd worden geïntroduceerd en gevarieerd binnen een object. Dit is zeer interessant voor sectoren als (i) zorg, (ii) bouw en (iii) automotive industrie omdat (i) het kansen biedt protheses/implantaten te maken die het (vaak inhomogene) natuurlijk weefsel nabootsen; (ii/iii) lichtgewicht, stijve constructies gemaakt kunnen worden waarbij de massa wordt geminimaliseerd wat leidt tot lagere materiaalkosten binnen de bouw en minder brandstofgebruik bij transport. Vergelijkbaar met de opkomst van spuitgieten in de jaren ’70-’80, is de kennis rondom 3D printen nog gefragmenteerd. Om hoogwaardige functionele producten te ontwikkelen is het nodig om kennis over materiaalkeuze, printstrategie en microscopisch en macroscopisch ontwerp te koppelen. In dit project werken ontwerpers, machinebouwers en materiaaldeskundigen van bedrijven en kennisinstituten samen aan de uitdaging: Hoe kunnen unieke, functionele en hoogwaardige lichtgewicht producten verkregen worden via 3D printen? Door het printen van diverse polymere materialen met verschillende printstrategieën en microstructuren wordt nieuwe kennis verkregen omtrent eigenschappen als sterkte, zachtheid, warmte-regulerend vermogen en de onderlinge werking/samenhang. Vervolgens zal deze kennis toegepast worden in een drietal Use Cases: o Printen van duurzame comfortabele borstprotheses. Naast pasvorm zijn eigenschappen als zachtheid, warmte- en vochtregulering en gewicht belangrijk voor het draagcomfort. o Printen van innovatieve gevelelementen die voldoende sterk en isolerend moeten zijn. Lichtgewicht biedt hier het voordeel dat het de bouwprofessionals ontlast en transportkosten spaart. o Printen van een lichtgewicht auto om brandstof te besparen. Als demonstrator is gekozen voor het printen van een raceauto die voldoet aan de veiligheidseisen van Formula Student races.
