Blar i Brage NIH på forfatter "Olstad, Bjørn Harald"
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50 m freestyle in 21, 22 and 23 s: What differentiates the speed curve of world-class and elite male swimmers?
Barbosa, Augusto C.; Barroso, Renato; Gonjo, Tomohiro; Rossi, Marcel M.; Paolucci, Leopoldo A.; Olstad, Bjørn Harald; Andrade, André G. P. (Peer reviewed; Journal article, 2021)We examined the association between 50 m freestyle performance (50FS) and average speed (AS), peak speed (PS), minimum speed (MS) and intracyclic speed variation (ISV) and compared the speed curves from swimmers with ... -
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. ... -
Arm–leg coordination during the underwater pull-out sequence in the 50, 100 and 200 m breaststroke start
Olstad, Bjørn Harald; Gonjo, Tomohiro; Conceição, Ana; Šťastný, Jan; Seifert, Ludovic (Peer reviewed; Journal article, 2022)Objectives: To investigate the arm–leg coordination from different perspectives of motor control during the underwater start sequence to understand whether differences exist between the three competitive breaststroke ... -
Arm–Leg coordination profiling during the dolphin kick and the arm pull-out in elite breaststrokers
Seifert, Ludovic; Conceição, Ana; Gonjo, Tomohiro; Stastny, Jan; Olstad, Bjørn Harald (Peer reviewed; Journal article, 2021)In breaststroke races, the dolphin kick could finish before, at the same time, or during the arm pull-out, but it is unclear how swimmers perform this technique. The aim of this study was to investigate whether swimmers ... -
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 ... -
Differences between elite and sub-elite swimmers in a 100 m breaststroke: A new race analysis approach with time-series velocity data
Gonjo, Tomohiro; Olstad, Bjørn Harald (Peer reviewed; Journal article, 2021)The purpose of the present study was to investigate differences in a 100 m breaststroke time-trial between elite and sub-elite swimmers. Elite and sub-elite male swimmers (seven each; 772.1 ± 35.2 and 610.6 ± 24.7 FINA ... -
Differences in race characteristics between world-class individual-medley and stroke-specialist swimmers
Gonjo, Tomohiro; Polach, Marek; Olstad, Bjørn Harald; Romann, Michael; Born, Dennis-Peter (Peer reviewed; Journal article, 2022)The purpose of the present study was to investigate differences between world-class individual medley (IM) swimmers and stroke-specialists using race analyses. A total of eighty 200 m races (8 finalists × 2 sexes × 5 events) ... -
The gold rush in para swimming: changes in the speed curve of a visually impaired world and paralympic champion–a case study
Barbosa, Augusto C.; Araújo, Leonardo Tomasello; Leis, Leonardo Vecchi; Lourenço, Thiago Fernando; Barroso, Renato; Gonjo, Tomohiro; Paolucci, Leopoldo A.; Olstad, Bjørn Harald; Andrade, André G. P. (Peer reviewed; Journal article, 2023)This case study examined the association between 50 m freestyle and speed curve parameters of a world-class Paralympic swimmer and analysed the changes in speed curves and their frequency components across her performance ... -
Intra- and inter-individual variability in the underwater pull-out technique in 200 m breaststroke turns
Gonjo, Tomohiro; Olstad, Bjørn Harald; Štastný, Jan; Conceição, Ana; Seifert, Ludovic (Peer reviewed; Journal article, 2023)The purpose of the present study was to investigate the intra- and inter-individual variability in arm-leg coordination during the underwater phase of the turn segment in 200 m breaststroke. Thirteen male swimmers were ... -
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 ... -
Key performance indicators related to strength, endurance, flexibility, anthropometrics, and swimming performance for competitive aquatic lifesaving
Reichmuth, Daniela; Olstad, Bjørn Harald; Born, Dennis-Peter (Peer reviewed; Journal article, 2021)The aim of the study was to investigate key performance indicators for the individual pool-based disciplines of competitive lifesaving regarding strength, flexibility, sprint and endurance swimming performance, anthropometric ... -
Load-Velocity Profile and Active Drag in Young Female Swimmers: An Age-Group Comparison
Wettengl, Christina; Karlsson, Rebecca Vilde Martine Krohn; Olstad, Bjørn Harald; Gonjo, Tomohiro (Peer reviewed; Journal article, 2023)Purpose: The present study aimed to establish differences in load–velocity profiling, active drag (AD), and drag coefficient (Cd) between 3 age groups of female swimmers. Methods: Thirty-three swimmers (11, 13, or 16 y ... -
Long-term changes in the speed curve of a world-class butterfly swimmer
Barbosa, Augusto C.; Barroso, Renato; Olstad, Bjørn Harald; Andrade, André G. (Peer reviewed; Journal article, 2021)This study describes the changes in selected points of the speed curve, stroke rate (SR), and stroke length (SL) of an elite butterfly swimmer and examines their relationship with average speed (AS) and competitive ... -
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 ... -
Motives, motivation, and motivational climate of young Norwegian swimmers, and their parents’ belief
Ljødal, Ingeborg; Olstad, Bjørn Harald; Pensgaard, Anne Marte (Peer reviewed; Journal article, 2023)Motivation is important for enjoyment, skill development, and persistence in swimming. The quality and direction of motivation is influenced by a swimmer’s perceived motivational climate, which is created by coaches and ... -
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 ...