Hiroshi Sekiya's research while affiliated with Hiroshima University and other places

Publications (214)

Article
Full-text available
The purpose of our study was (1) to clarify the elements and mechanisms of loss of spirit (LOS), and the ways to prevent LOS during competition, and (2) to identify the factors that prevent LOS. We interviewed 18 athletes and analyzed their interview transcripts by creating tags and categories. We divided the text of each transcript into text segme...
Article
In team sports, hesitation occurs when teammates make way for each other, and collision occurs when they crash into each other. The current study investigated reasons of these failures by focusing on the effect of the location of a target and the participants’ intentions on the failures. Ten and 6 pairs performed a choice-reaction task in cooperati...
Article
Full-text available
Although many studies on choking under pressure used closed skills, such as golf putting, we examined the influence of pressure on movement during a dynamic skill by studying participants' kinematic and kinetic changes during a table tennis forehand task under pressure. Thirty novice table tennis players hit forehand shots toward a target for 135 p...
Article
Full-text available
Japanese athletes often use the phrase “Kimochi ga kireta” (“I lost my spirit” in English) when they describe negative feelings during competitions. Although many athletes use this phrase and face this psychological problem, what it means and how it happens have not been studied. The purpose of this study was to clarify the mechanism underlying the...
Conference Paper
Full-text available
[Purpose] Japanese athletes often use the phrase “I lost my spirit” when negatively evaluating their feelings and performance during competitions. This research aims to classify the patterns of “loss of spirit” (LOS) during competitions. [Method] The study sample included 332 participants (111 female and 221 male; mean age = 19.94 ±1.24 years; mean...
Article
Solvation plays an essential role to control mechanism and dynamics of chemical reactions in solution. The present study reveals that changes in the local solute-solvent interaction have a great impact on the timescale of solvent rearrangement dynamics. Time-resolved IR spectroscopy has been applied to a hydration rearrangement reaction in the mono...
Article
Isomerization between two hydrogen-bonded (H-bonded) isomers of 5-hydroxyindole-(tert-butyl alcohol)1 cluster cations ([5HI-(t-BuOH)1]⁺) was investigated in the gas phase. In the S0 state, jet-cooled 5HI-(t-BuOH)1 has two structural isomers, 5HI(OH)-(t-BuOH)1 and 5HI(NH)-(t-BuOH)1, in which the t-BuOH molecule is bound to the OH or the NH group of...
Poster
Full-text available
Japanese athletes often use the phrase “I lost my spirit” when negatively evaluating their feeling and performance during competition. Avoiding loss of spirit (LOS) can help improve psychological condition and performance. Our purpose was (a) to clarify the elements and mechanisms of LOS and ways to inhibit LOS during competition, and (b) to identi...
Article
The effect of intermolecular interactions on excited-state intramolecular proton transfer (ESIPT) in 4'-N,N-dimethylamino-3-hydroxyflavone (DMHF) doped in acetonitrile crystals was investigated by measuring its temperature dependence of steady-state fluorescence excitation and fluorescence spectra and picosecond time-resolved spectra. The relative...
Article
Although sports players in the same team try to manage their interpersonal coordination for improved performance, failures such as hesitations and collisions are often seen in interpersonal coordination between teammates. However, it is unclear what factors influence the occurrence of such hesitations and collisions. The purpose of this study was t...
Article
Rearrangements of a water molecule in both directions between two hydrogen-bonding (H-bonding) sites of 5-hydroxyindole (5HI) cation was investigated in the gas phase. IR-dip spectra of jet-cooled 5HI-(H2O)1 revealed that two structural isomers, 5HI(OH)-(H2O)1 and 5HI(NH)-(H2O)1, in which a water molecule is bound to either the OH group or the NH g...
Article
Solvation of biomolecules by a hydrophilic and hydrophobic environment strongly affects their structure and function. Here, the structural, vibrational, and energetic properties of size-selected clusters of the microhydrated tryptamine cation with N2 ligands, TRA+-(H2O)m-(N2)n (m,n≤3), are characterized by infrared photodissociation (IRPD) spectros...
Article
Macromolecular crowding alters many of the biological processes ranging from protein folding and enzyme reactions in vivo to precipitation and crystallization of proteins in vitro. Herein, we have investigated the effect of specific monovalent Hofmeister salts (NaH2PO4, NaF, NaCl, NaClO4 and NaSCN) on the coil-globule transition of poly(N-isopropyl...
Poster
Japanese athletes often say “I lost spirit” when they describe negative feelings during competition. Although many athletes use this phrase, it is undetermined exactly what it means and how this phenomenon occurs. The purpose of this study was to clarify the usage of the phrase “loss of spirit” and the mechanism of this phenomenon during competitio...
Article
In this study, we examined the infl uence of psychological pressure on the psychological, physiological, and behavioral aspects as well as performance in a sprint start. Fourteen university sprinters performed six 20-m sprint trials; three trials each in non-pressure and pressure conditions. The pressure was induced by the instruction of a cash rew...
Article
The objective of the present study was to investigate the influences of psychological pressure on initial posture and anticipatory postural adjustment (APA) when performing a single forward step movement. Fourteen participants performed a single step toward a circular target (10 cm in diameter) in response to a beep sound. The trials were conducted...
Article
Full-text available
The effects of psychological pressure on corticospinal excitability and muscular activity were investigated in a two-choice reaction task that involved voluntary right index finger movements. In order to induce pressure, participants were given instructions that combined a performance-contingent cash reward, a penalty, and performance comparisons....
Poster
Full-text available
The phrase “Kimochi ga kireta” (“I had a broken spirit” in English terms) is often used by Japanese athletes when they describe negative feelings during competition. Meanings of this phrase and mechanisms of this phenomenon have not been studied, though many athletes use this phrase. The aim of this qualitative research was to make clear the usage...
Article
Infrared (IR) spectra of the enol and keto forms of 4-amino-6-oxopyrimidine (AOP) isolated in a low-temperature Xe matrix were recorded, where the change from the keto to the enol form was found to be induced by UV irradiation (λ > 270 nm). On the other hand, the hydrated crystal of AOP exhibited a similar IR spectrum to the anhydrous crystal by de...
Article
Size-selected clusters of the tryptamine cation with N2 ligands, TRA(+)-(N2)n with n = 1-6, are investigated by infrared photodissociation (IRPD) spectroscopy in the hydride stretch range and quantum chemical calculations at the ωB97X-D/cc-pVTZ level to characterize the microsolvation of this prototypical aromatic ethylamino neurotransmitter radica...
Article
抄録 Excited-state double-proton transfer (ESDPT) in the coplanar 7-azaindole dimer (7AI2) has been studied as a model base pair. Concerted and stepwise mechanisms were proposed for ESDPT in 7AI2. In the concerted mechanism, two protons transfer concertedly on the excited-state potential energy surfaces where a local minimum does not exist. On the ot...
Article
Effects of explicit and implicit perceptual training on pitch-type (fast or curved-ball) anticipation with probability information prior to pitching motion were investigated. Participants (n=30) were randomly assigned to an explicit or an implicit instruction group, or a control group. They were administered 30 pretest trials, 60 perceptual trainin...
Article
The hydrated N-(2-phenylethyl)acetamide (NPEA) clusters have been investigated in the gas phase. In the S0 state of NPEA-(H2O)2, each of two water molecules is hydrogen-bonded to the NH and CO groups, respectively, whereas these two groups are bridged with three water molecules in the S0 state of NPEA-(H2O)3. Upon photoionization of these clusters,...
Article
Rearrangement of intermolecular hydrogen bond in a monohydrated tryptamine cation, [TRA(H(2)O)(1)](+), has been investigated in the gas phase by IR spectroscopy and quantum chemical calculations. In the S(0) state of TRA(H(2)O)(1), a water molecule is hydrogen-bonded to the N atom of the amino group of a flexible ethylamine side chain [T. S. Zwier,...
Article
We present the resonance-enhanced multiphoton ionization, infrared-ultraviolet hole burning (IR-UV HB), and IR dip spectra of the trans-acetanilide-methanol (AA-MeOH) cluster in the S(0) , S(1) , and cationic ground state (D(0) ) in a supersonic jet. The IR-UV HB spectra demonstrate the co-existence of two isomers in S(0,1) , in which MeOH binds ei...
Article
Crystal structures of polymorphs of 2-(2'-hydroxyphenyl)benzimidazole (HPBI), Forms α and β, are analyzed by X-ray crystallography. The fluorescence excitation (FE) and fluorescence spectra of the polymorphs are separately observed at temperatures 77-298 K. It has been found that the electronic spectra of the two crystal forms are significantly dif...
Article
Full-text available
Factors related to choking under pressure during sports were investigated through a ques-tionnaire survey, and the relationships among them were examined. A questionnaire survey of choking was conducted among university students in sports-oriented school clubs (n=535). Exploratory factor analysis extracted 11 factors: changes in motor control and v...
Article
The photoreaction mechanisms of 2-naphthol and carbazole in low-temperature argon matrices have been investigated by infrared and electronic absorption spectroscopy with aids of density-functional-theory (DFT) and time-dependent DFT (TD-DFT) calculations. When the matrix samples were irradiated upon UV light, 2-naphthoxyl and N-carbazolyl radicals...
Article
Die Bewegung eines einzelnen Wasserliganden um eine Peptidbindung in Azetanilid wurde mit zeitaufgelöster IR‐Spektroskopie in Echtzeit untersucht. In ihrer Zuschrift auf S. 6708 ff. beobachten O. Dopfer, M. Fujii et al., dass ausgelöst durch Photoionisation der Wasserligand von der CO‐Seite der Peptidbindung freigegeben und an der NH‐Seite derselbe...
Article
A long and winding road: The motion of a single water ligand around a peptide bond in acetanilide was probed in real time by time-resolved IR spectroscopy. Triggered by photoionization, the H(2) O ligand is released from the CO site of the peptide linkage and trapped after a migration time of 5 ps at the NH site of the same peptide bond.
Article
The motion of a single water ligand around a peptide bond in acetanilide was probed in real time by time‐resolved IR spectroscopy. In their Communication on page 6604 ff., O. Dopfer, M. Fujii et al. observe that triggered by photo‐ionization, the H2O ligand is released from the CO site of the peptide linkage and trapped after a migration time of 5...
Article
Electroabsorption and electrophotoluminescence spectra were investigated for 2-(2′-hydroxyphenyl)benzimidazole in PMMA, and the results were compared with quantum chemical calculations. The electroabsorption spectrum of the enol form was ascribed to a change in the molecular polarizability following photoexcitation. On the other hand, the electroph...
Article
The V+(NH3)n ions with n = 4–8 are studied by infrared (IR) photodissociation spectroscopy in the NH-stretch region with the aid of density functional theory calculations. The calculations predict a square-planar coordination of V+ for the n = 4 ion. In the IR spectra of n ⩾ 5, red-shifted features emerge in the 3050–3300 cm−1 region; overall spect...
Article
Photoionization-induced water migration in the trans-formanilide-water 1:1 cluster, FA-(H2O)(1), has been investigated by using IR-dip spectroscopy, quantum chemical calculations, and ab initio molecular dynamics simulations. In the S-0 state, FA-(H2O)(1) has two structural isomers, FA(NH)-(H2O)(1) and FA(CO)-(H2O)(1), where a water molecule is hyd...
Article
Full-text available
In the present study, the in‰uence of psychological pressure on corticospinal motor tract (CST) excitability was investigated using monophasic transcranial magnetic stimulation (TMS) during ânênger movement. Nine participants performed a spatiotemporal tracing task using a small laser pointer attached to the right indenger. After seven acquisition...
Article
Full-text available
The primary purpose of the present study was to examine kinematic characteristics and force control during a golf-putting task under a pressure condition. The secondary purpose was to provide an exploratory investigation of the relationship between changes in behavior (kinematics and force control) and performance on the one hand, and psychological...
Article
The hydrated cobalt ions, Co+(H2O)n (n = 4–6), are studied with the infrared (IR) photodissociation spectroscopy in the OH-stretch region and density functional theory calculations. The calculations predict a T-shaped coordination structure for Co+(H2O)3, which exposes empty coordination sites for additional H2O ligands. Nevertheless, the IR spectr...
Article
Purpose: The purpose of this study was to investigate the ability of children with developmental disorders (CDD) to make estimations related to the avoidance of obstacles. Method: Participants were 9 CDD and 9 healthy children (HC) who had been diagnosed as having attention deficit-hyperactivity disorder or Asperger's syndrome, aged 5-6. As a visua...
Article
Full-text available
A picosecond pump and probe experiment has been applied to study the excited state dynamics of 7-azaindole-water 1 ∶ 2 and 1 ∶ 3 clusters [7AI(H(2)O)(2,3)] in the gas phase. The vibrational-mode selective Excited-State-Triple-Proton Transfer (ESTPT) in 7AI(H(2)O)(2) proposed from the frequency-resolved study has been confirmed by picosecond decays....
Article
Photoionization-induced rearrangement of the water network in the trans-formanilide 1:4 cluster, FA-(H(2)O)(4), has been investigated by using IR-photodissociation spectroscopy and quantum chemical calculations. The IR spectrum of FA-(H(2)O)(4) in the S(0) state shows that the observed cluster has a cyclic hydrogen-bonded structure where the CO gro...
Article
IR-dip spectra of trans-acetanilide-water 1:1 cluster, AA-(H(2)O)(1), have been measured for the S(0) and D(0) state in the gas phase. Two structural isomers, where a water molecule binds to the NH group or the CO group of AA, AA(NH)-(H(2)O)(1) and AA(CO)-(H(2)O)(1), are identified in the S(0) state. One-color resonance-enhanced two-photon ionizati...
Article
Full-text available
The 1st purpose of this study was to examine multiple electromyography (EMG) during voluntary hand movements. A secondary purpose was to investigate possible effects of pressure on intracortical inhibition (ICI) and intracortical facilitation (ICF) functions of the motor cortex, using paired-pulse transcranial magnetic stimulation. Twelve participa...
Article
Full-text available
The objective of this study was to use a questionnaire survey to comprehensively investigate the factors related to "choking under pressure" in sports. A number of different factors have been reported in previous research, depending on whether experiments, surveys, or qualitative methods were used. In this study, we therefore created a questionnair...
Article
Full-text available
We investigated changes in movement kinematics and attentional focus when expert and novice golfers performed a golf-putting task under pressure. Six male professional golfers and five male novice golfers performed 100 acquisition trials, followed by 10 trials in the pressure condition with a performance-contingent cash reward and small audience. A...
Article
Full-text available
Thêrst purpose of this study was to examine relationships between psychological/physiological and behavioral variables when participants are placed under pressure in a golf-putting task. The second purpose was to examine the relationships between psychological/physiological variables and performance. Sixteen male novices performed 150 acquisition t...
Article
We have investigated the excited-state multiple-proton/hydrogen atom transfer reactions in the 7-azaindole water clusters, [7AI](H(2)O)(n) (n = 2,3), in the gas phase by combining electronic spectroscopy and quantum chemical calculations. The fluorescence excitation (FE) spectrum of 7AI(H(2)O)(2) has been observed by monitoring visible emission. In...
Article
The gas-phase Ag+(CH3OH)n ions are studied by infrared photodissociation spectroscopy in the OH-stretch region. An analysis of the spectra with the aid of density functional theory calculations suggests that a coordination number of three is favored in the cases of Ag+(CH3OH)2·N2, Ag+(CH3OH)3, Ag+(CH3OH)5, and probably of Ag+(CH3OH)4. For the first...
Article
Photoreaction of 7-hydroxyquinoline monomer in a low-temperature argon matrix was investigated, and electronic absorption spectra of three unstable species generated by UV-light irradiation were measured. By comparison with the calculated spectral patterns obtained by the time-dependent density-functional-theory calculation, the electronic absorpti...
Article
Photoreactions of 7-hydroxyquinoline (7-HQ) in low-temperature (77-100 K) 2-methyltetrahydrofuran glass matrices are investigated using electronic spectroscopy. We have observed fluorescence excitation and fluorescence spectra of two long-lived species generated by irradiation of UV light (230-400 nm). The dominant species responsible for the fluor...
Article
Photoreaction mechanisms of 6-hydroxyquinoline (6-HQ) and 7-hydroxyquinoline (7-HQ) in low-temperature argon matrixes have been investigated by Fourier transform infrared (IR) spectroscopy and density-functional-theory (DFT) calculations. A comparison of the observed IR spectra of reactants with the corresponding calculated spectral patterns obtain...
Article
The photophysical properties of two bisindolylmaleimide derivatives, 3,4-bis(3-indolyl)-1-H-pyrrole-2,5-dione (arcyriarubin A) and indolo[2,3-a]pyrrolo[3,4-c] carbazole-5,7-(6 H)-dione (arcyriaflavin A), are investigated by using ab initio molecular orbital (MO) and multireference perturbation theory. These compounds are suggested to exist as monov...
Article
Full-text available
The purpose of this study was to investigate the characteristics of whole-body movement under pressure. The study participants, who were right-handed male university students (N=16), performed "tomeken ," which is a bilboquet technique, for 300 acquisition trials followed by 15 test trials. In the test, a small audience observed participants who ha...
Article
IR-dip spectra in the NH stretch regions have been measured for the S(0) state of the indole/N-methylacetamide 1:1 clusters (Ind-NMA(1)). We identified two structural isomers of Ind-NMA(1) that possess an N-H...O=C hydrogen bond. The redshifts of the NH stretch fundamental of the indole moieties in Ind-NMA(1) are larger than that for Ind-(H(2)O)(1)...
Article
Resonance-enhanced two-photon ionization (RE2PI) spectra of the deuterated 7-azaindole [7AI](MeOH)(n) (n = 1-3) clusters in the 0-0 region of the S(1)-S(0) (pi pi*) transition and IR-UV ion-dip spectra of the deuterated 7AI(MeOH)(n) (n = 1, 2) in the NH and OH stretch regions are observed in the gas phase to investigate the effect of charge transfe...
Article
The resonance-enhanced two-photon ionization (RE2PI) and laser-induced fluorescence excitation spectra were recorded for the S(1)-S(0)(pipi( *)) region of the 7-azaindole(ethanol)(n) (n=1-3) [7AI(EtOH)(n) (n=1-3)] clusters in the gas phase to investigate the geometrical structures and the multiple-proton/hydrogen atom transfer reaction dynamics. Fo...
Article
Infrared spectroscopy is applied to mass-selected Cu+(NH3)n and Ag+(NH3)n in the gas phase for investigating coordination chemistry of ammonia solvated noble-metal ions. The Cu+(NH3)3 ion prefers a three-coordinated structure but two-coordinated isomers are of growing importance until becoming predominant at n = 8 and 9. The first shell of the Ag+...
Article
The V+(H2O)n ions with n = 2–8 are studied by infrared (IR) photodissociation spectroscopy. The IR spectra indicate that H2O molecules are allowed to bind directly to V+ until the completion of a 4-coordinated structure and additional molecules are forced to occupy outer solvation shells. Density functional theory calculations suggest that one empt...
Article
The difference in the NH bond strengths in the (1)L(a) and (1)L(b) state of 7-azaindole is examined with the fluorescence-detected IR-dip spectroscopy. It has been found that the NH stretch fundamental (3456 cm(-1)) measured by probing the vibronic band at 280 cm(-1) above the zero-point level of (1)L(b) is remarkably red-shifted with respect to th...
Article
Full-text available
The objective of this study was to propose an inductive model for the process of choking under pres-sure by qualitatively investigating factors related to choking and their relationships. Thirteen athletes Mϭ7, Fϭ6 on the varsity in soft tennis, football, basketball, badminton, and archery teams participated in a semi-structured in-terview in which...
Article
Full-text available
Purpose] The purpose of this study was to clarify the characteristics of balance function in children with developmental disorders (DD). [Subjects] Participants in the experiment were 9 normal children and 9 children with DD, aged 5 to 6. [Methods] The stability of the children's centers of gravity was measured during 30 seconds of static standing,...
Article
Full-text available
It has been noted that the symptoms of children with developmental disorders (DD) include problems such as high frequency of accidentally bumping into objects or people. However, as of yet there has been no clarification of the characteristics of gross motor abilities in children with DD. The purpose of this study was to clarify those characteristi...
Article
Full-text available
The purpose of this study was to examine the influence of personality on causal attributions of choking in sport. We performed questionnaire surveys on 358 college and graduate students involved in sports, and performed covariance structure analysis to examine relationships between latent variables. We found that extroversion and emotional stabilit...
Article
IR-UV ion-dip spectra of the 7-azaindole (7AI)(CH(3)OH)(n) (n=1-3) clusters have been measured in the hydrogen-bonded NH and OH stretching regions to investigate the stable structures of 7AI(CH(3)OH)(n) (n=1-3) in the S(0) state and the cooperativity of the H-bonding interactions in the H-bonded networks. The comparison of the IR-UV ion-dip spectra...
Article
The excited-state double-proton transfer (ESDPT) reaction in the dual hydrogen-bonded 7-azaindole dimer (7AI2) in a supersonic jet expansion has been extensively studied with various laser spectroscopic methods and quantum chemistry calculations by many groups. This article reviews the results and discussions associated with stepwise and concerted...
Article
Infrared (IR) spectra are measured for Ag(+)(NH(3))(n) with n = 3-8 in the NH-stretch region using photodissociation spectroscopy. The spectra of n = 3 and 4 exhibit absorption features only near the frequencies of the isolated NH(3), indicating that every NH(3) molecule is coordinated individually to Ag(+). For n >or= 5, the occupation of the seco...
Article
Two isomers of the closed-ring forms of 1,2-bis(2,5-dimethyl-3-thienyl)perfluorocyclopentene (DMTF) having different S···S distances and dihedral angles between the two thiophene rings, are simultaneously observed in the FT-Raman spectrum by irradiation of UV light on microcrystals of the open-ring forms. Quantum chemistry calculations at the MP2/6...
Article
Full-text available
The purpose of this study was to examine the influence of time pressure on the psychological, physiological, and behavioral aspects of a dart-throwing task. Participants (N=25) performed 140 acquisition trials (10 trials x 14 blocks) followed by 10 test trials under time pressure. Time pressure was induced by instructing the participants to complet...
Article
The objective of this study was to investigate the influence of attentional shifts and pressure on movement fluency in a perceptual and single-joint movement task. Participants (N = 24) moved an arm lever in an attempt to trace a spatiotemporal movement target on a computer display. They performed 100 acquisition trials followed by 20 test trials....
Article
The first objective of this study was to investigate the relationship between positive and negative a ffect at three phases of a golf competition and performance in the competition. The second objective was to investigate the relationship between changes in positive and negative affect during the competition and performance in the competition. Thir...
Article
The fluorescence excitation and dispersed fluorescence spectra of 2-pyridone (2PY), 2-hydroxypyridine (2HP), and 2HP(H2O)n (n=1,2) clusters in the electronic excited π–π∗ state have been measured in a supersonic free jet expansion. The photoexcitation of various vibronic bands in the excited state of 2HP(H2O)n (n=1,2) does not provide fluorescence...
Article
Coordination and solvation structures of the Cu(+)(NH(3))(n) ions with n = 3-8 are studied by infrared photodissociation spectroscopy in the NH-stretch region with the aid of density functional theory calculations. Hydrogen bonding between NH(3) molecules is absent for n = 3, indicating that all NH(3) molecules are bonded directly to Cu(+) in a tri...
Article
The fluorescence excitation and dispersed fluorescence spectra of jet-cooled 4-dimethylamino-7-azaindole dimer are recorded to investigate the effect of a substitution of a dimethylamino group into the 4-position of the hydrogen atom of the 7-azaindole on the excited-state double proton transfer (ESDPT). The substitution of the dimethylamino group...