Yasuo Sengoku

Yasuo Sengoku
University of Tsukuba · Faculty of Health and Sport Sciences

PhD

About

66
Publications
10,009
Reads
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268
Citations
Citations since 2016
36 Research Items
256 Citations
2016201720182019202020212022020406080
2016201720182019202020212022020406080
2016201720182019202020212022020406080
2016201720182019202020212022020406080
Introduction
I am working on training and coaching science in swimming. I am also the Head Coach of Univ. of Tsukuba Swimming Team. National Team Coach at 2016 World Swimming Championship(25m) and 2017 Universiade Games Japanese Swimming Team.
Additional affiliations
April 2010 - present
University of Tsukuba
Position
  • Professor (Assistant)

Publications

Publications (66)
Preprint
Full-text available
This study aimed to estimate the trunk twist angle from the shoulder and hip rotation angles in short-distance crawl swimming and to elucidate the twist motion of the relationship between the trunk and the rotation angular velocity in response to changes in swimming speed. Swimming speed during the experimental trials was computed from the subject'...
Article
Full-text available
This study aimed to investigate the changes in kinematics and muscle activity with increasing swimming velocity during underwater undulatory swimming (UUS). In a water flume, 8 male national-level swimmers performed three UUS trials at 70, 80, and 90% of their maximum swimming velocity (70, 80, and 90%V, respectively). A motion capture system was u...
Article
Full-text available
PurposeThis study investigated the relationship between hand kinematics, hand hydrodynamic pressure distribution and hand propulsive force when swimming the front crawl with maximum effort.Methods Twenty-four male swimmers participated in the study, and the competition levels ranged from regional to national finals. The trials consisted of three 20...
Article
Full-text available
The three-dimensional (3D) motion of lower-limb joints is evaluated during various sports. However, few studies have reported the 3D lower-limb joint movement during undulatory underwater swimming (UUS). This study aimed to investigate the relationship between 3D lower-limb kinematics and forward-swimming velocity during UUS at maximal velocity. A...
Article
Full-text available
In this study, we investigated the rotation motion performed in the trunk during a sprint front crawl swimming. The shoulder and hip rotation movements at different swimming velocity were compared and analyzed. Ten male swimmers specializing in front crawl sprinting participated. The two trials were conducted in front crawl without breathing for 10...
Article
Full-text available
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 in proportion to the cube of the velocity, which implies that a proficient technique to miminise the resistive (and maximise the...
Article
The kick-start technique in competitive swimming generates a force acting on the starting platform owing to gravity, muscle contraction and resulting joint torque. To understand optimal body movement on the starting platform for maximising take-off velocity, it is necessary to investigate the joint torque in relation to the joint’s rotation effects...
Article
Background: Inspiratory muscle fatigue (IMF) may impair performance in a subsequent exercise. A few studies have reported that IMF decreased swimming performance in sub-maximal intensity or severe intensity domain. However, the impact of IMF on high-intensity short-duration swimming is not clear. The purpose of this study was to clarify the effect...
Article
Full-text available
This study aims at clarifying the factors responsible for the change in hand propulsive force when the stroke frequency was changed. Eight male swimmers performed five 20-m-front crawls. The first trial involved maximal effort, whereas the stroke frequency was controlled during the next four trials. The instructed stroke frequencies were 70%, 80%,...
Article
Full-text available
Aim: It has been reported that the relationships between blood glucose and lactate during incremental exercise has been affected by the training status. Nevertheless, the relationships between blood glucose, lactate, and hormones during incremental exercise in different training states have not been examined. Therefore, the purposes of this study w...
Article
It is becoming common for top-level swimmers to perform the medicine ball throw down sets (MBTD), consisting of an exercise of throwing a medicine ball downward forcefully onto the ground prior to the race event. However, MBTD effectiveness remains controversial. We investigated the effect of completing the MBTD on sprint front crawl performance. E...
Article
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 (SF max). Eight male swimmers performed 20 m front crawl four times. The first trial involved maximal effort, whereas SF was controlled during the next t...
Conference Paper
Full-text available
The purpose of this study was to clarify about the changes of the kinematics during underwater undulatory swimming (UUS) with increasing the swimming velocity. Eight male collegiate swimmers performed three UUS trials at the 70%, 80% and 90% velocity of their maximum effort swimming velocity in a water flume. For motion analysis, a motion capture s...
Article
Full-text available
Background: Altitude training has often been conducted just before main competition games in many sports. An increase in the frequency of upper respiratory tract infections and gastrointestinal infections due to an altitude-induced suppression of the immune system has been reported after altitude training. Salivary secretory immunoglobulin A (SIgA...
Article
Human undulatory underwater swimming (UUS) is an underwater propelling technique in competitive swimming and its propulsive mechanism is poorly understood. The purpose of this study was to visualize the three-dimensional (3D) flow field in the wake region during human UUS in a water flume. A national level male swimmer performed 41 UUS trials in a...
Article
Objective and method: To examine the effect of altitude swimming training on BNP (Brain natriuretic peptide) and ANP (Atrial Natriuretic Peptide) levels, and evaluate if BNP and ANP can be hemodynamic markers of hypoxia- and traininginduced stress, Ten collegiate swimmers (Tr) who participated in the altitude training camp at 1900m and 5 healthy su...
Article
Hypothermia can occur during aquatic exercise despite production of significant amounts of heat by the active muscles. Because the characteristics of human thermoregulatory responses to cold during exercise have not been fully elucidated, we investigated the effect of low-intensity exercise on the shivering response to core cooling in cool water. E...
Article
Full-text available
The purpose of this study was to compare active drag during front-crawl swimming performed by competitive swimmers with passive drag acting on the same group of swimmers with streamlined position at various velocities. Seven male competitive swimmers participated in this study, and the testing was conducted in a swimming flume. The active drag was...
Article
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This study investigated effects of skeletal muscle cooling on the metabolic response and kinetics of pulmonary oxygen uptake ( V ˙ O2 ) and skeletal muscle deoxygenation during submaximal exercise. In the cooling condition (C), after immersion of the lower body into 12°C water for 30 min, eight healthy males performed 30-min cycling exercise at...
Conference Paper
Full-text available
The aims of this study were to clarify differences in hip and knee joint movements during dolphin kick alone and during butterfly stroke swimming, and to investigate which parameter relates to swimming performance in each stroke. Eight male swimmers performed three trials using dolphin kick with a kick board (BD), underwater dolphin kick (UD), and...
Conference Paper
The purpose of this study was to investigate oxygen up-take (VO2) and heart rate (HR) kinetics during swimming exercise at lactate threshold intensity, and to clarify the association of these parameters with endurance capacity and performance. After previous determination of VO2max, swimming velocity at VO2max (v VO2max) and swimming velocity at la...
Article
In this study, we investigated the effects of increased kick frequency on the propelling efficiency and the muscular co-activation during underwater dolphin kick. Participants included eight female collegiate swimmers. The participants performed seven 15-m underwater dolphin kick swimming trials at different kick frequencies, which is 85, 90, 95, 1...
Article
Full-text available
We investigated the effects of synchronizing kick frequency with the beat of a metronome on kinematic and electromyographic (EMG) parameters during the underwater dolphin kick as a pilot study related to the research that entitled “Effect of increased kick frequency on propelling efficiency and muscular co-activation during underwater dolphin kick”...
Conference Paper
Full-text available
This study described swimmers’ leg motions and the three-dimensional flow field around their legs during undulatory underwater swimming (UUS). We used the particle image velocimetry (PIV) method and a three-dimensional motion capture system. Seven male swimmers participated and we acquired EMG data of one male swimmer during UUS after the previous...
Article
Full-text available
Purpose: This study investigated the effects of water temperature on cardiorespiratory responses and exercise performance during immersed incremental cycle exercise until exhaustion. Methods: Ten healthy young men performed incremental cycle exercise on a water cycle ergometer at water temperatures (T w) of 18, 26 and 34 °C. Workload was initial...
Conference Paper
Full-text available
This study investigated the muscle activation pattern between the agonist and the antagonist muscles in the trunk, thigh and lower leg during underwater dolphin kick. Thirteen female elite swimmers participated in this study and they performed 15 m underwater dolphin kick swimming at maximum effort. The surface electromyography (sEMG) of six muscle...
Conference Paper
Full-text available
The purpose of this study was to visualize the flow characteristic behind a swimmer during undulatory underwater swimming (UUS). A male college swimmer performed dolphin kicks in a water flume channel (flow velocity was set at 0.8 m·s −1). By using the stereo PIV system, we captured the flow vector field in cross-sectional areas behind the swimmer...
Article
Full-text available
Aim: We examined the difference in blood glucose and lactate kinetics between highly and moderately trained runners during an incremental running test, and to examine the relationship between GT and LT in different training states. Methods: Eight highly trained (25.9 ± 5.6 years, 167.6 ± 5.2 cm, 57.5 ± 6.0 kg) and eight moderately trained (23.8 ± 3...
Article
Full-text available
The purpose of this study was to clarify the pattern of muscular activity in the trunk, thigh and lower leg during the underwater dolphin kick in elite female competitive swimmers. The participants were 9 national-level competitive female swimmers who performed underwater dolphin kick swimming for 15 m at maximum effort. Sagittal movement was recor...
Article
Aquatic exercise such as swimming is performed in the water of 18 to 34 °C because of the differences in ambient environmental conditions. Heat conductivity of water is greater than that of air, therefore water temperature would have a considerable impact on physiological responses and exercise performance. A previous study has shown that, oxygen c...
Article
Full-text available
The purpose of this study was to identify the characteristics of the pressure distribution around the foot during breaststroke kicking and the relationship between the fluid force and the pressure distribution by comparison among different swimmers. Eight male elite swimmers, whose specialties were breaststroke and individual medley, participated i...
Article
Full-text available
We investigated the relationship between lumbar alignment and trunk muscle activities during the underwater streamline position. Twenty‐two male collegiate swimmers participated in the study. Firstly, spinal alignments of 22 participants were evaluated during standing and underwater streamline position using image analysis. Thoracic kyphosis angle...
Article
Background: Physical exercise has been reported to be the most effective method to improve cognitive function and brain health, but there is as yet no research on the effect of water-based exercise. Aims: The aim of the present study was to compare the effects of water-based exercise with and without cognitive stimuli on cognitive and physical f...
Article
Undulatory underwater swimming (UUS) is an important swimming technique after a start and after turns. It was considered that a higher swimming velocity (U) resulted from a higher kick frequency (f), and greater propelling efficiency, i.e., Strouhal number (St) and Froude efficiency (gF), resulted from a lower f. The aim of this study was to invest...
Article
The present case study intended to measure blood glucose fluctuation in two marathon runners during a 100 km race utilizing a continuous glucose monitoring system (CGMS), and investigate the relationship between glucose profile and change in running speed. Two experienced ultra-marathon runners participated in this study. A CGMS glucose sensor was...
Article
Full-text available
This study clarified the differences between swimming performance in a water flume and in a pool by comparing kinematics and kinesthesia during dolphin kick swimming in both conditions. Seven national-level male college swimmers (age 20.4±1.5 years, height 1.73±0.06 m, weight 68.1±6.0 kg) swam using prone dolphin kicks in a water flume channel and...
Article
Full-text available
The purpose of this study was to identify the relationship between swimming performance and estimated ‰uid force by pressure distribution analysis of breaststroke kicking motion. Eleven elite male swimmers participated in the study, and provided written informed consent. Each subject performed the breaststroke kicking motion for 10 seconds without...
Article
The present study investigated the difference in blood glucose concentration (Glu) response during an incremental swimming test before and after a ten-week training period and verified whether blood glucose threshold (GT) could be determined in competitive swimmers. 7 elite male university swimmers participated in this study. 2 incremental swimming...
Article
Blood lactate kinetics is an important physiological determinant of endurance exercise performance. Recently, some studies reported that the blood glucose transition point can also be observed (blood glucose threshold; GT) and the GT is consistent with the lactate threshold (LT). However, we have recently reported that blood glucose kinetics and bl...
Article
Full-text available
During exercise in water children's body temperature are especially likely to be affected by a cold water environment because of their morphological characteristic. There is a lack of information about the recommended environmental condition for elementary school swimming classes based on scientific objective data. This study investigated multiple...
Article
This study was intended to clarify 1) the difference of the exercise intensity at blood lactate threshold (LT) and blood glucose threshold (GT), 2) the effect of exercise duration on the LT and GT during two sets of incremental running test. Ten male runners (age 25.0±3.2 yr, height 171.2±5.5 cm, body mass 57.9±4.0 kg, VO2max 64.6±3.0 ml/kg/min) co...
Article
The present study was conducted to obtain basic information about blood glucose fluctuation and relation with race performance during 100 km marathon. Subcutaneous glucose of one well-trained runner was measured by continuous glucose monitoring system (CGMS) at 5 min interval and blood samples for biochemical analysis were drawn at pre, middle and...
Article
A study was conducted to identify the effect of a computer-assisted swimming instruction (CASI) program on children's learning motivation and learning strategy. Twenty children learning to swim in a private swimming club participated. The subjects were classified into an experimental group that used the CASI program before each swimming lesson and...

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