Now showing items 1-20 of 20

    • 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: ...
    • Comparison of non-invasive individual monitoring of the training and health of athletes with commercially available wearable technologies 

      Düking, Peter; Hotho, Andreas; Holmberg, Hans-Christer; Sperlich, Billy (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-03-09)
      Athletes adapt their training daily to optimize performance, as well as avoid fatigue, overtraining and other undesirable effects on their health. To optimize training load, each athlete must take his/her own personal objective and subjective characteristics into consideration and an increasing number of wearable technologies (wearables) provide convenient monitoring of various parameters. ...
    • 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 ...
    • 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 ...
    • Functional High-Intensity Circuit Training Improves Body Composition, Peak Oxygen Uptake, Strength, and Alters Certain Dimensions of Quality of Life in Overweight Women 

      Sperlich, Billy; Wallmann-Sperlich, Birgit; Zinner, Christoph; Von Stauffenberg, Valerie; Losert, Heidrun; Holmberg, Hans-Christer (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-04-03)
      The effects of circuit-like functional high-intensity training (Circuit<sub>HIIT</sub>) alone or in combination with high-volume low-intensity exercise (Circuit<sub>combined</sub>) on selected cardio-respiratory and metabolic parameters, body composition, functional strength and the quality of life of overweight women were compared. In this single-center, two-armed randomized, controlled study, ...
    • 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 ...
    • Instant Biofeedback Provided by Wearable Sensor Technology Can Help to Optimize Exercise and Prevent Injury and Overuse 

      Düking, Peter; Holmberg, Hans-Christer; Sperlich, Billy (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-04-03)
      With great interest, we have been following the developing variety and popularity of commercially available wearable sensor technologies, as well as the discussion concerning their usefulness for improving fitness and health (Duking et al., 2016; Halson et al., 2016; Sperlich and Holmberg,2016). Although many of these devices may not necessarily fulfill scientific criteria for quality (Sperlich and ...
    • 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 ...
    • 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 ...
    • 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 ...
    • 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 ...
    • 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 ...
    • The pacing strategy and technique of male cross-country skiers With different levels of performance during a 15-km classical race 

      Welde, Boye; Stöggl, Thomas; Mathisen, Gunnar; Supej, Matej; Zoppirolli, Chiara; Winther, Andreas Kjæreng; Pellegrini, Barbara; Holmberg, Hans-Christer (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-11-08)
      In this study the pacing strategy, cycle characteristics and choice of technique of elite male cross-country (XC) skiers during a three-lap, 15-km classical race with interval start were measured. During the Norwegian Championships in 2016, fast (n = 18, age: 26±4 yr; height: 182±4 cm; body mass: 78±3 kg (means±SD)) and slow skiers (n = 18, age: 22±2 yr; height: 183±5 cm; body mass: 78±6 kg) were ...
    • The physiological mechanisms of performance enhancement with sprint interval training differ between the upper and lower extremities in humans 

      Zinner, Christoph; Morales-Alamo, David; Ørtenblad, Niels; Larsen, Filip J; Schiffer, Tomas A; Willis, Sarah J; Gelabert-Rebato, Miriam; Perez-Valera, Mario; Boushel, Robert; Calbet, Jose AL; Holmberg, Hans-Christer (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-09-30)
      To elucidate the mechanisms underlying the differences in adaptation of arm and leg muscles to sprint training, over a period of 11 days 16 untrained men performed six sessions of 4–6 × 30-s all-out sprints (SIT) with the legs and arms, separately, with a 1-h interval of recovery. Limb-specific VO2peak, sprint performance (two 30-s Wingate tests with 4-min recovery), muscle efficiency and ...
    • 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 ...
    • 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, ...
    • The Responses of Elite Athletes to Exercise: An All-Day, 24-h Integrative View Is Required! 

      Sperlich, Billy; Holmberg, Hans-Christer (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-08-14)
      The current research topics in Frontiers of Physiology include “Training intensity, volume and recovery distribution among elite and recreational endura nce athletes” (Frontiers in Physiology, 2016) and “Wearable Sensor Technology for Monitoring Training Load and Health in the Athletic Population” (Frontiers in Physiology, 2017). As editors of both of these topics, we would like to share some ...
    • A SWOT Analysis of the Use and Potential Misuse of Implantable Monitoring Devices by Athletes 

      Sperlich, Billy; Düking, Peter; Holmberg, Hans-Christer (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-09-05)
      We have been following the developments and popularity of commercially available wearable sensor technology, as well as the ongoing discussion concerning its usefulness for improving the fitness and health of athletes (Düking et al., 2016, 2017; Sperlich and Holmberg, 2017) with considerable interest. Here, we would like to draw attention to a new generation of implantable devices (implantables) ...
    • 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 ...