Browsing Brage NIH by Author "Gonjo, Tomohiro"
Now showing items 1-20 of 25
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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 ... -
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 ... -
Body roll amplitude and timing in backstroke swimming and their differences from front crawl at the same swimming intensities
Gonjo, Tomohiro; Fernandes, Ricardo J.; Vilas-Boas, João Paulo; Sanders, Ross (Peer reviewed; Journal article, 2021)The current study investigated body roll amplitude and timing of its peak in backstroke and compared them with front crawl swimming. Nineteen anatomical landmarks were digitised using 80 swimming trial videos (ten ... -
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 limb coordination in polyrhythmic production among water polo players, artistic swimmers and drummers
Vathagavorakul, Ravisara; Gonjo, Tomohiro; Homma, Miwako (Peer reviewed; Journal article, 2020)This study compares polyrhythmic production ability between water polo players (WPs), artistic swimmers (ASs) and drummers (Ds), to assess how their differing experiences in coordinating complex inter-limb activity with ... -
Differences in limb coordination in polyrhythmic production among water polo players, artistic swimmers and drummers
Vathagavorakul, Ravisara; Gonjo, Tomohiro; Homma, Miwako (Peer reviewed; Journal article, 2020)This study compares polyrhythmic production ability between water polo players (WPs), artistic swimmers (ASs) and drummers (Ds), to assess how their differing experiences in coordinating complex inter-limb activity with ... -
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) ... -
Differences in the rotational effect of buoyancy and trunk kinematics between front crawl and backstroke swimming
Gonjo, Tomohiro; Fernandes, Ricardo J.; Vilas-Boas, J. Paulo; Sanders, Ross (Peer reviewed; Journal article, 2021)The purpose of the present study is to investigate differences between front crawl and backstroke swimming in hydrodynamic (produced by swimmers) and buoyant torque around the transverse axis. Ten swimmers performed 50 m ... -
The effect of experience in movement coordination with music on polyrhythmic production: Comparison between artistic swimmers and water polo players during eggbeater kick performance
Vathagavorakul, Ravisara; Gonjo, Tomohiro; Homma, Miwako (Peer reviewed; Journal article, 2020)The aim of this study was to compare artistic swimmers (ASs) and water polo players (WPs) in their polyrhythmic production ability and entrainment between arm and leg motion frequency. Nine ASs and nine WPs participated ... -
Effects of exceeding stroke frequency of maximal effort on hand kinematics and hand propulsive force in front crawl
Koga, Daiki; Gonjo, Tomohiro; Kawai, Eisuke; Tsunokawa, Takaaki; Sakai, Shin; Sengoku, Yasuo; Homma, Miwako; Takagi, Hideki (Peer reviewed; Journal article, 2020)This study aimed to assess kinematic and kinetic changes in front crawl with various stroke frequency (SF) conditions to investigate why swimming velocity (SV) does not increase above a certain SF (SFmax). Eight male ... -
Front crawl body roll characteristics in a Paralympic medallist and national level swimmers with unilateral arm amputation
Gonjo, Tomohiro; Kishimoto, Taichi; Sanders, Ross; Saito, Mayumi; Takagi, Hideki (Peer reviewed; Journal article, 2019)The purpose of this study was to establish the asymmetry and body wave characteristics related to shoulder, hip, knee, and ankle roll in unilateral arm amputee swimmers. Three unilateral arm amputee swimmers, including one ... -
Front Crawl Is More Efficient and Has Smaller Active Drag Than Backstroke Swimming: Kinematic and Kinetic Comparison Between the Two Techniques at the Same Swimming Speeds
Gonjo, Tomohiro; Narita, Kenzo; McCabe, Carla; Fernandes, Ricardo J.; Vilas-Boas, João Paulo; Takagi, Hideki; Sanders, Ross (Peer reviewed; Journal article, 2020)The purpose of this study was to investigate differences in Froude efficiency (ηF ) and active drag (DA) between front crawl and backstroke at the same speed. ηF was investigated by the three-dimensional (3D) motion analysis ... -
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 ... -
How do swimmers control their front crawl swimming velocity?: Current knowledge and gaps from hydrodynamic perspectives
Takagi, Hideki; Nakashima, Motomu; Sengoku, Yasuo; Tsunokawa, Takaaki; Koga, Daiki; Narita, Kenzo; Kudo, Shigetada; Sanders, Ross; Gonjo, Tomohiro (Peer reviewed; Journal article, 2021)The aim of this study was to review the literature on front crawl swimming biomechanics, focusing on propulsive and resistive forces at different swimming velocities. Recent studies show that the resistive force increases ... -
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 ... -
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 ... -
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 ... -
The relationship between selected load-velocity profile parameters and 50 m front crawl swimming performance
Gonjo, Tomohiro; Njøs, Nikolai; Eriksrud, Ola; Olstad, Bjørn Harald (Peer reviewed; Journal article, 2021)The purpose of the present study was to establish relationships between sprint front crawl performance and a swimming load-velocity profile. Fourteen male national-level swimmers performed 50 m front crawl and semi-tethered ...