Seasonal Variations in V[Combining Dot Above]O2max, O2-Cost, O2-Deficit, and Performance in Elite Cross-Country Skiers

2013 ◽  
Vol 27 (7) ◽  
pp. 1780-1790 ◽  
Author(s):  
Thomas Losnegard ◽  
Håvard Myklebust ◽  
Matt Spencer ◽  
Jostein Hallén
2021 ◽  
Vol 3 ◽  
Author(s):  
Per-Øyvind Torvik ◽  
Roland van den Tillaar ◽  
Øyvind Sandbakk

Cross-country (XC) skiers employ whole-body exercise to generate speed through poles and skis. The choice of optimal pole and ski lengths are therefore of high importance. The aim of this study was to document pole and ski lengths among elite male and female cross-country skiers in the classical and skating styles and to investigate sex differences in body-height-normalized pole and ski lengths. Our secondary purpose was to correlate body-height-normalized pole and ski lengths with performance level within both sexes. In total, Norwegian men and women (n = 87 and 36, respectively), participating in the Norwegian XC championship 2020, were investigated. Most athletes used poles close to the length allowed by the International Ski Federation (FIS) in the classical style among both sexes, with men using slightly longer poles than women (p < 0.05). Body-height-normalized pole lengths in skating were similar in men and women (around 90% of body height). Women used relatively longer ski lengths than men in both styles (p < 0.05). Women showed moderate correlations (r = 0.43, p < 0.05) between body-height-normalized pole lengths and sprint performance. Male and female cross-country skiers use as long classical ski poles as possible within the current regulations, while they use skating poles similar to recommendations given by the industry. The fact that men use longer body-height-normalized poles than women, where there is a correlation between pole length and sprint performance, indicate that faster women are able to better utilize the potential of using longer poles when double-poling. However, while women use relatively longer skis than men, no correlation with performance occurred for any of the sexes.


2014 ◽  
Vol 28 (7) ◽  
pp. 812-822 ◽  
Author(s):  
Jan Merok Paulsen ◽  
Olof Johansson ◽  
Lejf Moos ◽  
Elisabet Nihlfors ◽  
Mika Risku

Purpose – The purpose of this paper is to analyse the superintendent position, its relation to the local political system and the function as superior of principals in the school district in order to illuminate important district-level conditions for student learning. Influences from historical legacies and policy cultures are investigated by means of cross-country case analyses. Design/methodology/approach – This paper is based on data from national surveys of superintendent leadership in Sweden, Denmark, Finland and Norway. Findings – A key point is the observation of a mix-mode system of hard and soft governance. Municipalities, schools, teachers and pupils are – in different degrees across the Nordic countries – subjected to external evaluation and assessment by central control agencies, where the streams of reports, assessments and performance data are assembled. However, shifts in the governance systems are only modestly reflected in the self-reports on the superintendents’ role. Overall, superintendents in the cases express a self-preferred leadership style as professional learning facilitators who focus on pupil orientation, which positions the superintendent in “crossfires” between conflicting stakeholder demands. Research limitations/implications – The paper reinforces the importance of superintendent leadership in local school governance. It underscores the importance that superintendents facilitate learning conditions for school leaders, teachers and students, which we see as a promising path for further research. Originality/value – The paper provides empirical evidence regarding superintendent leadership situated in local social and political contexts within the Nordic countries. The cross-country analysis illuminates how path-pendent historical legacies mediate current reform trends.


2020 ◽  
Vol 11 ◽  
Author(s):  
Jan-Michael Johansen ◽  
Sannija Goleva-Fjellet ◽  
Arnstein Sunde ◽  
Lars Erik Gjerløw ◽  
Lars Arne Skeimo ◽  
...  

2014 ◽  
Vol 36 (3) ◽  
pp. 281-292 ◽  
Author(s):  
John W. Mahoney ◽  
Daniel F. Gucciardi ◽  
Nikos Ntoumanis ◽  
Cliff J. Mallet

We argue that basic psychological needs theory (BPNT) offers impetus to the value of mental toughness as a mechanism for optimizing human functioning. We hypothesized that psychological needs satisfaction (thwarting) would be associated with higher (lower) levels of mental toughness, positive affect, and performance and lower (higher) levels of negative affect. We also expected that mental toughness would be associated with higher levels of positive affect and performance and lower levels of negative affect. Further, we predicted that coaching environments would be related to mental toughness indirectly through psychological needs and that psychological needs would indirectly relate with performance and affect through mental toughness. Adolescent cross-country runners (136 male and 85 female, Mage = 14.36) completed questionnaires pertaining to BPNT variables, mental toughness, and affect. Race times were also collected. Our findings supported our hypotheses. We concluded that BPNT is generative in understanding some of the antecedents and consequences of mental toughness and is a novel framework useful for understanding mental toughness.


Author(s):  
Alan F. Stokes ◽  
Joshua Downs

Communications datalink, the transmission of messages as screen-displayed text between cockpits and ground stations, appears to offer both advantages and disadvantages compared to conventional VHF voice communications. The study reported here examines both the communication and performance of integrated communications datalink in single pilot instrument flight operations. Sixteen pilots flew two cross-country instrument flights in an AST complex-aircraft flight simulator with a moving map, traffic, and datalinked message display. In the conventional voice condition experimenters played the role of ATC controllers speaking over the radio. In the datalinked condition, controllers operated a computerized ‘ground station’, sending and receiving text messages on screen. Pilot communications, control and performance data were monitored for each phase of flight, as well as the interaction of pilot expertise and workload. The results suggest that communications datalink may widen the performance gap between experienced and inexperienced aviators, and that delayed responses are such that operational difficulties could occur, not least in busy airspace.


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