• A new tool for the automatic detection of muscular voluntary contractions in the analysis of electromyographic signals 

      Pimentel, Angela; Gomes, Ricardo; Olstad, Bjørn Harald; Gamboa, Hugo (Journal article; Peer reviewed, 2015-03-11)
      Electromyographic (EMG) signals play a key role in many clinical and biomedical applications. They can be used for identifying patients with muscular disabilities, assessing lower-back pain, kinesiology and motor control. ...
    • Breaststroke swimmers moderate internal work increases toward the highest stroke frequencies 

      Lauer, Jessy; Olstad, Bjørn Harald; Minetti, Alberto Enrico; Kjendlie, Per-Ludvik; Rouard, Annie Hélène (Journal article; Peer reviewed, 2015-09-18)
      A model to predict the mechanical internal work of breaststroke swimming was designed. It allowed us to explore the frequency–internal work relationship in aquatic locomotion. Its accuracy was checked against internal work ...
    • Key Factors Related to Short Course 100 m Breaststroke Performance 

      Olstad, Bjørn Harald; Wathne, Henrik; Gonjo, Tomohiro (Peer reviewed; Journal article, 2020)
      Background and aim: To identify kinematic variables related to short course 100 m breaststroke performance. Methods: An automatic race analysis system was utilized to obtain start (0–15 m), turn (5 m before the wall until ...
    • Maximal Heart Rate for Swimmers 

      Olstad, Bjørn Harald; Bjørlykke, Veronica O.; Olstad, Daniela Schäfer (Peer reviewed; Journal article, 2019)
      The main purpose of this study was to identify whether a different protocol to achieve maximal heart rate should be used in sprinters when compared to middle-distance swimmers. As incorporating running training into swim ...
    • Muscle activation and kinematics in contemporary breaststroke swimming 

      Olstad, Bjørn Harald (Doctoral thesis, 2016)
      This thesis consists of five studies, the main objectives of which were to establish a reliable method for conducting surface electromyography (EMG) in water over prolonged submersion (Study 1); to develop a specific method ...
    • Muscle activation in world champions, world-class and national breaststroke swimmers 

      Olstad, Bjørn Harald; Zinner, Christoph; Vaz, João Rocha; Cabri, Jan; Kjendlie, Per-Ludvik (Journal article; Peer reviewed, 2016-08)
      Purpose: Investigating the muscle activation patterns and coactivation with the support of kinematics in some of the world’s best breaststrokers and identify performance discriminates related to national elites at maximal ...
    • Muscle coordination during breaststroke swimming: comparison between elite swimmers and beginners 

      Vaz, João R.; Olstad, Bjørn Harald; Cabri, Jan; Kjendlie, Per-Ludvik; Pezarat-Correia, Pedro; Hug, Francois (Journal article; Peer reviewed, 2016-02)
      The present study aimed to compare muscle coordination strategies of the upper and lower limb muscles between beginners and elite breaststroke swimmers. Surface electromyography (EMG) of eight muscles was recorded in 16 ...
    • Muscle coordination, activation and kinematics of world-class and elite breaststroke swimmers during submaximal and maximal efforts 

      Olstad, Bjørn Harald; Vaz, Joao Rocha; Zinner, Christoph; Cabri, Jan; Kjendlie, Per-Ludvik (Journal article; Peer reviewed, 2016-07-25)
      The aims of this study were to describe muscular activation patterns and kinematic variables during the complete stroke cycle (SC) and the different phases of breaststroke swimming at submaximal and maximal efforts. Surface ...
    • Outsourcing swimming education—experiences and challenges 

      Olstad, Bjørn Harald; Berg, Pernille Ravn; Kjendlie, Per-Ludvik (Peer reviewed; Journal article, 2020)
      In Norway, swimming and lifesaving education (swimming education) is an obligatory part of physical education, with explicit learning aims after grade four. After recent reports of Norwegian pupils achieving low scores in ...
    • Race analysis in competitive swimming: A narrative review 

      Gonjo, Tomohiro; Olstad, Bjørn Harald (Peer reviewed; Journal article, 2020)
      Researchers have quantified swimming races for several decades to provide objective information on race strategy and characteristics. The purpose of the present review was to summarize knowledge established in the literature ...
    • Reliability of load-velocity profiling in front crawl swimming 

      Olstad, Bjørn Harald; Gonjo, Tomohiro; Njøs, Nikolai; Abächerli, Kathrin; Eriksrud, Ola (Peer reviewed; Journal article, 2020)
      The purposes of this study were to establish test-retest reliability of calculating load-velocity profiles in front crawl swimming using five and three different external loads, and if outcome results were comparable between ...
    • Start and turn performances of competitive swimmers in sprint butterfly swimming 

      Gonjo, Tomohiro; Olstad, Bjørn Harald (Peer reviewed; Journal article, 2020)
      The purposes of this study were to establish relationships between selected underwater kinematics and the starting and turning performances and to quantify kinematic differences between these segments in sprint butterfly ...
    • SwimBIT: A Novel Approach to Stroke Analysis During Swim Training Based on Attitude and Heading Reference System (AHRS) 

      Felix, Eduardo Ramos; da Silva, Hugo Plácido; Olstad, Bjørn Harald; Cabri, Jan; Correia, Paulo Lobato (Peer reviewed; Journal article, 2019)
      In a world where technology is assuming a pervasive role, sports sciences are also increasingly exploiting the possibilities opened by advanced sensors and intelligent algorithms. This paper focuses on the development of ...
    • Validation of the Polar OH1 and M600 optical heart rate sensors during front crawl swim training 

      Olstad, Bjørn Harald; Zinner, Christoph (Peer reviewed; Journal article, 2020)
      Purpose: The Polar OH1 is an optical heart rate (HR) sensor which can be used on different parts of the body. The purpose of the study was to evaluate the validity of the OH1 as well as a wrist worn heart rate device (Polar ...