Recent additions

  • Improved maximal strength is not associated with improvements in sprint time or jump height in high-level female football players: a clusterrendomized controlled trial 

    Pedersen, Sigurd; Heitmann, Kim Arne; Sagelv, Edvard Hamnvik; Johansen, Dag; Pettersen, Svein Arne (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-09-17)
    <i>Background</i> - Maximal strength increments are reported to result in improvements in sprint speed and jump height in elite male football players. Although similar effects are expected in females, this is yet to be elucidated. The aim of this study was to examine the effect of maximal strength training on sprint speed and jump height in high-level female football players.<p> <p><i>Methods</i> ...
  • Intra‐arterial blood pressure traits during and after heavy resistance exercise in healthy males 

    Heitmann, Kim Arne; Dalen, Håvard; Gundersen, Guri Holmen; Ingvaldsen, Rolf Petter; Welde, Boye (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-07-29)
    This randomized within‐subjects crossover‐designed study evaluated intra‐arterial blood pressure (BP) traits in seven healthy males (24 ± 1 years) during heavy resistance exercise (HRE) to failure (10 × 5 repetitions, 5RES) and not to failure (10 × 3 repetitions, 3RES), both at 5RM load. By combining few repetitions, avoidance of Valsalva maneuver, and restricting the duration of each contraction, ...
  • Seasonal variations in objectively assessed physical activity among people with COPD in two Nordic countries and Australia: a cross-sectional study 

    Hoaas, Hanne; Zanaboni, Paolo; Hjalmarsen, Audhild; Morseth, Bente; Dinesen, Birthe; Burge, Angela T.; Cox, Narelle S.; Holland, Anne E. (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-06-05)
    <i>Purpose</i>: Seasons and weather conditions might influence participation in physical activity and contribute to differences between countries. This study aimed at investigating whether there were differences in physical activity levels between Norwegian, Danish and Australian people with chronic obstructive pulmonary disease (COPD), and establishing if any variations in physical activity were ...
  • Resource rent in aquaculture 

    Flaaten, Ola; Pham, Thi Thanh Thuy (Chapter; Bokkapittel, 2019)
    Resource rent in aquaculture (RRA) is any payment to a farm and site owner, on land or sea, in excess of the costs needed to bring that farm into production. For analytic and policy purposes it may be useful to distinguish among different types of RRA. Three types will be discussed: rent associated with the classical economists Ricardo (1821) and Faustmann (1849), as well as oligopoly rent from ...
  • The Potential Usefulness of Virtual Reality Systems for Athletes: A Short SWOT Analysis 

    Düking, Peter; Holmberg, Hans-Christer; Sperlich, Billy (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-03-05)
    Virtual reality (VR) systems (Neumann et al., 2017), which are currently receiving considerable attention from athletes, create a two- or three-dimensional environment in the form of emulated pictures and/or video-recordings where in addition to being mentally present, the athlete even often feels like he/she is there physically as well. As she/he interacts with and/or reacts to this environment, ...
  • Impact of incline, sex and level of performance on kinematics during a distance race in classical cross-country skiing 

    Stöggl, Thomas; Welde, Boye; Supej, Matej; Zoppirolli, Chiarra; Rolland, Carsten Gade; Holmberg, Hans-Christer; Pellegrini, Barbara (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-03-01)
    Here, female and male elite cross-country (XC) skiers were compared on varying terrain during an official 10-km (women) and 15-km (men) Norwegian championship race. On the basis of race performance, 82 skiers were classified as fast (FS) (20 women, 20 men) or slower (SS) (21, 21) skiers. All were video recorded on flat (0°), intermediate (3.5°), uphill (7.1°) and steep uphill (11°) terrain during ...
  • The Olympic biathlon - Recent advances and perspectives after pyeongchang 

    Laaksonen, Marko S; Jonsson, Malin; Holmberg, Hans-Christer (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-07-02)
    The biathlon, combining cross-country ski skating with rifle marksmanship, has been an Olympic event since the Winter Games in Squaw Valley, United States, in 1960. As a consequence of replacing the classical with the skating technique in the 1980s, as well as considerable improvements in equipment and preparation of ski tracks and more effective training, the average biathlon skiing speed has ...
  • A 4-Week Intervention Involving Mobile-Based Daily 6-Minute Micro-Sessions of Functional High-Intensity Circuit Training Improves Strength and Quality of Life, but Not Cardio-Respiratory Fitness of Young Untrained Adults 

    Sperlich, Billy; Hahn, Lea-Sofie; Edel, Antonia; Behr, Tino; Helmprobst, Julian; Leppich, Robert; Wallmann-Sperlich, Birgit; Holmberg, Hans-Christer (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-05-09)
    The present study was designed to assess the psycho-physiological responses of physically untrained individuals to mobile-based multi-stimulating, circuit-like, multiplejoint conditioning (Circuit<sub>HIIT</sub>) performed either once (1xCircuit<sub>HIIT</sub>) or twice (2xCircuit<sub>HIIT</sub>) daily for 4 weeks. In this single-center, two-arm randomized, controlled study, 24 men and women (age: ...
  • Developments in the biomechanics and equipment of Olympic cross-country skiers 

    Pellegrini, Barbara; Stoggl, Thomas Leonhard; Holmberg, Hans-Christer (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-07-24)
    Here, our aim was to describe the major changes in cross-country (XC) skiing in recent decades, as well as potential future developments. XC skiing has been an Olympic event since the very first Winter Games in Chamonix, France, in 1924. Over the past decades, considerable developments in skiing techniques and improvements in equipment and track preparation have increased skiing speed. In contrast ...
  • The influence of physiobiomechanical parameters, technical aspects of shooting, and psychophysiological factors on biathlon performance: A review 

    Laaksonen, Marko S; Finkenzeller, Thomas; Holmberg, Hans-Christer; Sattlecker, Gerold (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-09-08)
    The biathlon, an Olympic sporting discipline that combines cross-country skiing with rifle marksmanship, entails considerable physiological demands, as well as fine motor control while shooting after intense exercise and under mental pressure. Although much of our knowledge about cross-country skiing is probably also applicable to the biathlon, carrying the rifle and shooting under stress make ...
  • Pacing and predictors of performance during cross-country skiing races: A systematic review 

    Stöggl, Thomas; Pellegrini, Barbara; Holmberg, Hans-Christer (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-09-15)
    <i>Background</i>: Cross-country skiing (XCS) racing, a popular international winter sport, is complex and challenging from physical, technical, and tactical perspectives. Despite the vast amount of research focusing on this sport, no review has yet addressed the pacing strategies of elite XCS racers or the factors that influence their performance. The aim was to review the scientific literature ...
  • Macro-kinematic differences between Sprint and Distance cross-country skiing competitions using the classical technique 

    Marsland, Finn; Anson, Judith; Waddington, Gordon; Holmberg, Hans-Christer; Chapman, Dale W (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-05-17)
    We compare the macro-kinematics of six elite female cross-country skiers competing in 1.1-km Sprint and 10.5-km Distance classical technique events on consecutive days under similar weather and track conditions. The relative use of double pole (DP), kick-double pole (KDP), diagonal stride (DS), tucking (Tuck) and turning (Turn) subtechniques, plus each technique’s respective velocities, cycle ...
  • Following a long-distance classical race the whole-body kinematics of double poling by elite cross-country skiers are altered 

    Zoppirolli, Chiara; Bortolan, Lorenzo; Stella, Federico; Boccia, Gennaro; Holmberg, Hans-Christer; Schena, Federico; Pellegrini, Barbara (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-07-25)
    Introduction: <br>Although short-term (approximately 10-min) fatiguing DP has been reported not to alter the joint kinematics or displacement of the centre of mass (COM) of high-level skiers, we hypothesize that prolonged DP does change these kinematics, since muscular strength is impaired following endurance events lasting longer than 2 h. <br>Methods:<br> During the 58-km Marcialonga race ...
  • Integrated framework of load monitoring by a combination of smartphone applications, wearables and point-of-care testing provides feedback that allows individual responsive adjustments to activities of daily living 

    Düking, Peter; Achtzehn, Silvia; Holmberg, Hans-Christer; Sperlich, Billy (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-05-19)
    Athletes schedule their training and recovery in periods, often utilizing a pre-defined strategy. To avoid underperformance and/or compromised health, the external load during training should take into account the individual’s physiological and perceptual responses. No single variable provides an adequate basis for planning, but continuous monitoring of a combination of several indicators of ...
  • The muscle fiber profiles, mitochondrial content, and enzyme activities of the exceptionally well-trained arm and leg muscles of elite cross-country skiers 

    Ørtenblad, Niels; Nielsen, Joachim; Boushel, Robert; Söderlund, Karin; Saltin, Bengt; Holmberg, Hans-Christer (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-08-02)
    As one of the most physically demanding sports in the Olympic Games, crosscountry skiing poses considerable challenges with respect to both force generation and endurance during the combined upper- and lower-body effort of varying intensity and duration. The isoforms of myosin in skeletal muscle have long been considered not only to define the contractile properties, but also to determine metabolic ...
  • Prolonged sitting interrupted by 6-min of high-intensity exercise: Circulatory, metabolic, hormonal, thermal, cognitive, and perceptual responses 

    Sperlich, Billy; De Clerck, Ine; Zinner, Christoph; Holmberg, Hans-Christer; Wallmann-Sperlich, Birgit (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-10-16)
    The aim was to examine certain aspects of circulatory, metabolic, hormonal, thermoregulatory, cognitive, and perceptual responses while sitting following a brief session of high-intensity interval exercise. Twelve students (five men; age, 22 ± 2 years) performed two trials involving either simply sitting for 180 min (SIT) or sitting for this same period with a 6-min session of high-intensity ...
  • The Training of Olympic Alpine Ski Racers 

    Gilgien, Matthias; Reid, Robert Cortas; Raschner, Christian; Supej, Matej; Holmberg, Hans-Christer (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-12-21)
    Alpine combined was the only alpine ski racing event at the first Winter Olympic Games in 1936, but since then, slalom, giant slalom, super-G, downhill, and team events have also become Olympic events. Substantial improvements in slope preparation, design of courses, equipment, and the skills of Olympic alpine skiers have all helped this sport attain its present significance. Improved snow ...
  • Whole-body vibrations associated with alpine skiing: A risk factor for low back pain? 

    Supej, Matej; Ogrin, Jan; Holmberg, Hans-Christer (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-03-09)
    Alpine skiing, both recreational and competitive, is associated with high rates of injury. Numerous studies have shown that occupational exposure to whole-body vibrations is strongly related to lower back pain and some suggest that, in particular, vibrations of lower frequencies could lead to overuse injuries of the back in connection with alpine ski racing. However, it is not yet known which ...
  • Comparison of Long and Short High-Intensity Interval Exercise Bouts on Running Performance, Physiological and Perceptual Responses 

    Valstad, Sverre; Heimburg, Erna von; Welde, Boye; van den Tillaar, Roland (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-12-18)
    This study compared the effects of long (4×4 min) and short intervals (4×8×20 s) of high-intensity interval exercise bouts (HIIT) on running performance, physiological and perceptual responses, and excess postexercise oxygen consumption (EPOC). Twelve healthy college students (8 men, 4 women; mean age=22±2 years) performed long (90–95% of peak heart rate) and short intervals (maximal intensity) of ...
  • Recommendations for assessment of the reliability, sensitivity, and validity of data provided by wearable sensors designed for monitoring physical activity 

    Düking, Peter; Fuss, Franz Konstantin; Holmberg, Hans-Christer; Sperlich, Billy (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-04-30)
    Although it is becoming increasingly popular to monitor parameters related to training, recovery, and health with wearable sensor technology (wearables), scientific evaluation of the reliability, sensitivity, and validity of such data is limited and, where available, has involved a wide variety of approaches. To improve the trustworthiness of data collected by wearables and facilitate comparisons, ...

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