Katsuo Fujiwara
Biographic Data
| ID | 4146184 |
|---|---|
| NAME | Katsuo Fujiwara |
| GIVEN NAMES | Katsuo |
| FAMILY NAME | Fujiwara |
| SIGNATURE | FUJIWARA K |
| AFFILIATIONS | Kanazawa University |
| VERIFIED | No |
| TOTAL WORKS | 21 |
| TOTAL CITATIONS | 1 |
| WORKS AS AUTHOR | 21 |
| WORKS AS EDITOR | 0 |
| FIRST PUBLICATION YEAR | 1997 |
| LATEST PUBLICATION YEAR | 2022 |
| H-INDEX | 1 |
Age-related changes in the activation timing of postural muscles to the prime mover muscle for bilateral arm flexion during standing
Background We aimed to obtain the standard values of age-related changes in the activation timing of postural muscles to the prime mover muscle (anterior deltoid [AD]) for bilateral arm flexion during standing. Methods The study participants were 276 children (aged 3-14 years) and 32 adults (aged 20-26 years). In response to a visual stimulus, participants raised both arms from a fully extended position as quickly as possible, stopped their arms …
Influence of sports experience on distribution of pro-saccade reaction time under gap condition
Background Previous studies indicated that substantial individual variation exists in the distribution of pro-saccade reaction times under gap condition. To investigate the influence of sports experience on the distribution, we examined distribution of the pro-saccade reaction time under overlap and gap conditions, for the basketball club, table tennis club, and non-sporting control groups. Methods Subjects performed pro-saccade tasks under the o…
Timings of attentional switching to perturbation and postural preparation during transient forward or backward floor translation
BACKGROUND: Relationships between the timings of attentional switching and postural preparation were investigated using a choice-reaction paradigm with transient floor translation (S2), with the direction indicated by a warning auditory signal (S1). METHODS: Thirteen healthy young adults participated in this study. S2 started 2 s after S1 onset while standing on the platform. The platform moved forward when S1 was a high tone, and backward when S…
Developmental changes in shortening of pro-saccade reaction time while maintaining neck flexion position
BACKGROUND: We investigated developmental changes in shortening of pro-saccade reaction time while maintaining neck flexion. METHODS: Subjects comprised 135 children (3-14 years) and 29 young adults (19-23 years). Children were divided into six groups in 2-year age strata. Pro-saccade reaction tasks for 30 s were performed in neck rest and flexion positions. Reaction times under each position were averaged in every 10-s period. RESULTS: Under nec…
Activation timing of postural muscles of lower legs and prediction of postural disturbance during bilateral arm flexion in older adults
BACKGROUND: Activation timings of postural muscles of lower legs and prediction of postural disturbance were investigated in young and older adults during bilateral arm flexion in a self-timing task and an oddball task with different probabilities of target presentation. Arm flexion was started from a standing posture with hands suspended 10 cm below the horizontal level in front of the body, in which postural control focused on the ankles is imp…
Postural control and contingent negative variation during transient floor translation while standing with the ankle fixed
BACKGROUND: Adaptation changes in postural muscle activity and anticipatory attention were investigated with the ankle joint fixed to change postural control strategies during transient floor translation. METHODS: For 15 healthy young adults, 40 transient floor translations (S2) in the anterior direction were applied 2 s after an auditory warning signal (S1), under conditions with or without fixation of the ankle. Activity of the frontal postural…
Event-related brain potential and postural muscle activity during standing on an oscillating table while the knee, hip, and trunk are fixed
BACKGROUND: In this study, a cast brace was used to immobilize the knee, hip, and trunk, and relations between the event-related brain potential (ERP) and postural muscle activity were investigated while standing on an oscillating table. METHODS: Twelve healthy young adults maintained a standing posture for 1 min per trial while oscillating in the anteroposterior direction at 0.5 Hz with a 2.5-cm amplitude. Trials were performed without and with …
Effect of time pressure on attentional shift and anticipatory postural control during unilateral shoulder abduction reactions in an oddball-like paradigm
BACKGROUND: The effect of time pressure on attentional shift and anticipatory postural control was investigated during unilateral shoulder abduction reactions in an oddball-like paradigm. METHODS: A cue signal (S1) - imperative signal (S2) sequence was repeated with various S2-S1 intervals (1.0, 1.5, and 2.0 s). S2 comprised target and non-target stimuli presented at the position (9° to the left or the right) indicated by S1. Right shoulder abduc…
Dominant side in single-leg stance stability during floor oscillations at various frequencies
BACKGROUND: We investigated lateral dominance in the postural stability of single-leg stance with anteroposterior floor oscillations at various frequencies. METHODS: Thirty adults maintained a single-leg stance on a force platform for 20 seconds per trial. Trials were performed with no oscillation (static condition) and with anteroposterior floor oscillations (2.5-cm amplitude) at six frequencies: 0.25, 0.5, 0.75, 1.0, 1.25 and 1.5 Hz (dynamic co…
Adaptation changes in dynamic postural control and contingent negative variation during repeated transient forward translation in the elderly
BACKGROUND: Adaptation changes in postural control and contingent negative variation (CNV) for the elderly were investigated during repeated forward floor translation. METHODS: Fifteen healthy elderly persons, living in the suburban area of Kanazawa City, Japan, underwent backward postural disturbance by a forward-floor translation (S2) 2 s after an auditory warning signal (S1). A set with 20 trials was repeated until a negative peak of late CNV …
Effect of maintaining neck flexion on anti-saccade reaction time
BACKGROUND: Reaction time for anti-saccade, in which the gaze is directed to the position opposite to an illuminated target, shortens during maintenance of neck flexion. The present study applied transcranial magnetic stimulation (TMS) to the frontal oculomotor field, and investigated the effect of maintaining neck flexion on information processing time in the anti-saccade neural pathway before the frontal oculomotor field. METHODS: The reaction …
Adaptation changes in dynamic postural control and contingent negative variation during backward disturbance by transient floor translation in the elderly
BACKGROUND: We investigated adaptation changes in dynamic postural control and contingent negative variation (CNV) in 13 young and 12 elderly adults. Subjects repeatedly underwent backward postural disturbance by a forward floor translation (S2) 2 s after an auditory warning signal (S1). Initial and second sets were conducted, each set with 20 trials. Posterior peak position of the center of pressure in the anteroposterior direction (CoPy) after …
The effects of neck flexion on cerebral potentials evoked by visual, auditory and somatosensory stimuli and focal brain blood flow in related sensory cortices
BACKGROUND: A flexed neck posture leads to non-specific activation of the brain. Sensory evoked cerebral potentials and focal brain blood flow have been used to evaluate the activation of the sensory cortex. We investigated the effects of a flexed neck posture on the cerebral potentials evoked by visual, auditory and somatosensory stimuli and focal brain blood flow in the related sensory cortices. METHODS: Twelve healthy young adults received rig…
Age-related Changes and Sex Differences in Postural Control Adaptability in Children during Periodic Floor Oscillation with Eyes Closed
We investigated age-related changes and sex differences in adaptability of anticipatory postural control in children. Subjects comprised 449 children (4-12 years old) and 109 young adults (18-29 years old). Subjects stood with eyes closed on a force-platform fixed to a floor oscillator. We conducted five trials of 1-minute oscillation (0.5 Hz frequency, 2.5 cm amplitude) in the anteroposterior direction. Postural steadiness was quantified as the …
Regular Heel-raise Training Focused on the Soleus for the Elderly
The soleus, one of the triceps surae muscles, greatly contributes to standing and walking. Strength training focused on the soleus could be important to prevent age-related deterioration in these functions. We therefore investigated the effects of regular heel-raise training focused on the soleus for the elderly. Forty-nine healthy women aged 60 to 79 years trained for at least 40 days in a period of two months. Training consisted of a set of 100…
Relationship between Quiet Standing Position and Perceptibility of Standing Position in the Anteroposterior Direction
We investigated the relationship between an individual's center of pressure in the anteroposterior direction in quiet standing (QS) and perceptibility of different standing positions. The position of the center of pressure in the anteroposterior direction (CoPy position) while standing was represented as the percentage distance (%FL) from the hindmost point of the heel in relation to foot length. CoPy position in QS was located from 31 to 58%FL. …
Eye Movement Performance and Prefrontal Hemodynamics during Saccadic Eye Movements in the Elderly
No previous study has investigated age-related changes in prefrontal hemodynamics during saccade tasks in a large number of elderly adults. The purpose of this study was to evaluate prefrontal activity related to the performance of anti-saccade in the elderly using near-infrared spectroscopy (NIRS). Ninety-six elderly adults and 22 young adults performed pro- and anti-saccade tasks. Measures included reaction times of both saccades, error rate du…
Postural Control Adaptability to Floor Oscillation in the Elderly
We established a method to evaluate postural control adaptability, applying it to 341 subjects, aged 18-29 years (young subjects) and 50-79 years, in order to investigate the influences of age and gender on adaptability. Subjects stood with eyes closed on a force plate fixed to a floor oscillator, which was sinusoidally oscillated in the anteroposterior direction with 0.5 Hz frequency and 2.5 cm amplitude. Five trials of 1-minute oscillation were…
Changes in Saccadic Reaction Time while Maintaining Neck Flexion in the Elderly
We investigated changes in saccadic reaction time during maintenance of neck flexion in elderly individuals. Subjects comprised 49 volunteers, including 19 young adults and 30 elderly adults. Elderly subjects were separated into 2 groups (trained group: n=18; untrained group: n=12) based on responses to a questionnaire concerning activities of daily living. Saccadic reaction time was measured at angles of neck flexion of 0 degrees (resting positi…
Optimal Vibration Stimulation to the Neck Extensor Muscles Using Hydraulic Vibrators to Shorten Saccadic Reaction Time
Optimal vibration stimulation to the neck extensor muscles using hydraulic vibrators to shorten the saccadic reaction time was examined. Subjects were 14 healthy young adults. Visual targets (LEDs) were located 10 degrees left and right of a central point. The targets were alternately lit for random durations of 2-4 seconds in a resting neck condition and various vibration conditions, and saccadic reaction times were measured. Vibration amplitude…
Difference in Level of Automatization of Upper and Lower Limb Movements
This study investigated differences in automatization level of upper and lower limb movements by analyzing degree of the interference between upper and lower limb movements when the subjects performed transitory upper or lower limb movement at will during periodic movement of the other limb.Nonfulfillment of the assigned limb tasks was only observed when the subjects performed transitory lower limb movement during periodic upper limb movement.Thi…
Difference in Level of Automatization of Upper and Lower Limb Movements
This study investigated differences in automatization level of upper and lower limb movements by analyzing degree of the interference between upper and lower limb movements when the subjects performed transitory upper or lower limb movement at will during periodic movement of the other limb.Nonfulfillment of the assigned limb tasks was only observed when the subjects performed transitory lower limb movement during periodic upper limb movement.Thi…
Difference in Level of Automatization of Upper and Lower Limb Movements
This study investigated differences in automatization level of upper and lower limb movements by analyzing degree of the interference between upper and lower limb movements when the subjects performed transitory upper or lower limb movement at will during periodic movement of the other limb.Nonfulfillment of the assigned limb tasks was only observed when the subjects performed transitory lower limb movement during periodic upper limb movement.Thi…
Changes in Saccadic Reaction Time while Maintaining Neck Flexion in the Elderly
We investigated changes in saccadic reaction time during maintenance of neck flexion in elderly individuals. Subjects comprised 49 volunteers, including 19 young adults and 30 elderly adults. Elderly subjects were separated into 2 groups (trained group: n=18; untrained group: n=12) based on responses to a questionnaire concerning activities of daily living. Saccadic reaction time was measured at angles of neck flexion of 0 degrees (resting positi…
Optimal Vibration Stimulation to the Neck Extensor Muscles Using Hydraulic Vibrators to Shorten Saccadic Reaction Time
Optimal vibration stimulation to the neck extensor muscles using hydraulic vibrators to shorten the saccadic reaction time was examined. Subjects were 14 healthy young adults. Visual targets (LEDs) were located 10 degrees left and right of a central point. The targets were alternately lit for random durations of 2-4 seconds in a resting neck condition and various vibration conditions, and saccadic reaction times were measured. Vibration amplitude…
Postural Control Adaptability to Floor Oscillation in the Elderly
We established a method to evaluate postural control adaptability, applying it to 341 subjects, aged 18-29 years (young subjects) and 50-79 years, in order to investigate the influences of age and gender on adaptability. Subjects stood with eyes closed on a force plate fixed to a floor oscillator, which was sinusoidally oscillated in the anteroposterior direction with 0.5 Hz frequency and 2.5 cm amplitude. Five trials of 1-minute oscillation were…
Regular Heel-raise Training Focused on the Soleus for the Elderly
The soleus, one of the triceps surae muscles, greatly contributes to standing and walking. Strength training focused on the soleus could be important to prevent age-related deterioration in these functions. We therefore investigated the effects of regular heel-raise training focused on the soleus for the elderly. Forty-nine healthy women aged 60 to 79 years trained for at least 40 days in a period of two months. Training consisted of a set of 100…
Relationship between Quiet Standing Position and Perceptibility of Standing Position in the Anteroposterior Direction
We investigated the relationship between an individual's center of pressure in the anteroposterior direction in quiet standing (QS) and perceptibility of different standing positions. The position of the center of pressure in the anteroposterior direction (CoPy position) while standing was represented as the percentage distance (%FL) from the hindmost point of the heel in relation to foot length. CoPy position in QS was located from 31 to 58%FL. …
Eye Movement Performance and Prefrontal Hemodynamics during Saccadic Eye Movements in the Elderly
No previous study has investigated age-related changes in prefrontal hemodynamics during saccade tasks in a large number of elderly adults. The purpose of this study was to evaluate prefrontal activity related to the performance of anti-saccade in the elderly using near-infrared spectroscopy (NIRS). Ninety-six elderly adults and 22 young adults performed pro- and anti-saccade tasks. Measures included reaction times of both saccades, error rate du…
Age-related Changes and Sex Differences in Postural Control Adaptability in Children during Periodic Floor Oscillation with Eyes Closed
We investigated age-related changes and sex differences in adaptability of anticipatory postural control in children. Subjects comprised 449 children (4-12 years old) and 109 young adults (18-29 years old). Subjects stood with eyes closed on a force-platform fixed to a floor oscillator. We conducted five trials of 1-minute oscillation (0.5 Hz frequency, 2.5 cm amplitude) in the anteroposterior direction. Postural steadiness was quantified as the …
Adaptation changes in dynamic postural control and contingent negative variation during backward disturbance by transient floor translation in the elderly
BACKGROUND: We investigated adaptation changes in dynamic postural control and contingent negative variation (CNV) in 13 young and 12 elderly adults. Subjects repeatedly underwent backward postural disturbance by a forward floor translation (S2) 2 s after an auditory warning signal (S1). Initial and second sets were conducted, each set with 20 trials. Posterior peak position of the center of pressure in the anteroposterior direction (CoPy) after …
The effects of neck flexion on cerebral potentials evoked by visual, auditory and somatosensory stimuli and focal brain blood flow in related sensory cortices
BACKGROUND: A flexed neck posture leads to non-specific activation of the brain. Sensory evoked cerebral potentials and focal brain blood flow have been used to evaluate the activation of the sensory cortex. We investigated the effects of a flexed neck posture on the cerebral potentials evoked by visual, auditory and somatosensory stimuli and focal brain blood flow in the related sensory cortices. METHODS: Twelve healthy young adults received rig…
Adaptation changes in dynamic postural control and contingent negative variation during repeated transient forward translation in the elderly
BACKGROUND: Adaptation changes in postural control and contingent negative variation (CNV) for the elderly were investigated during repeated forward floor translation. METHODS: Fifteen healthy elderly persons, living in the suburban area of Kanazawa City, Japan, underwent backward postural disturbance by a forward-floor translation (S2) 2 s after an auditory warning signal (S1). A set with 20 trials was repeated until a negative peak of late CNV …
Effect of maintaining neck flexion on anti-saccade reaction time
BACKGROUND: Reaction time for anti-saccade, in which the gaze is directed to the position opposite to an illuminated target, shortens during maintenance of neck flexion. The present study applied transcranial magnetic stimulation (TMS) to the frontal oculomotor field, and investigated the effect of maintaining neck flexion on information processing time in the anti-saccade neural pathway before the frontal oculomotor field. METHODS: The reaction …
Effect of time pressure on attentional shift and anticipatory postural control during unilateral shoulder abduction reactions in an oddball-like paradigm
BACKGROUND: The effect of time pressure on attentional shift and anticipatory postural control was investigated during unilateral shoulder abduction reactions in an oddball-like paradigm. METHODS: A cue signal (S1) - imperative signal (S2) sequence was repeated with various S2-S1 intervals (1.0, 1.5, and 2.0 s). S2 comprised target and non-target stimuli presented at the position (9° to the left or the right) indicated by S1. Right shoulder abduc…
Dominant side in single-leg stance stability during floor oscillations at various frequencies
BACKGROUND: We investigated lateral dominance in the postural stability of single-leg stance with anteroposterior floor oscillations at various frequencies. METHODS: Thirty adults maintained a single-leg stance on a force platform for 20 seconds per trial. Trials were performed with no oscillation (static condition) and with anteroposterior floor oscillations (2.5-cm amplitude) at six frequencies: 0.25, 0.5, 0.75, 1.0, 1.25 and 1.5 Hz (dynamic co…
Event-related brain potential and postural muscle activity during standing on an oscillating table while the knee, hip, and trunk are fixed
BACKGROUND: In this study, a cast brace was used to immobilize the knee, hip, and trunk, and relations between the event-related brain potential (ERP) and postural muscle activity were investigated while standing on an oscillating table. METHODS: Twelve healthy young adults maintained a standing posture for 1 min per trial while oscillating in the anteroposterior direction at 0.5 Hz with a 2.5-cm amplitude. Trials were performed without and with …
Activation timing of postural muscles of lower legs and prediction of postural disturbance during bilateral arm flexion in older adults
BACKGROUND: Activation timings of postural muscles of lower legs and prediction of postural disturbance were investigated in young and older adults during bilateral arm flexion in a self-timing task and an oddball task with different probabilities of target presentation. Arm flexion was started from a standing posture with hands suspended 10 cm below the horizontal level in front of the body, in which postural control focused on the ankles is imp…
Postural control and contingent negative variation during transient floor translation while standing with the ankle fixed
BACKGROUND: Adaptation changes in postural muscle activity and anticipatory attention were investigated with the ankle joint fixed to change postural control strategies during transient floor translation. METHODS: For 15 healthy young adults, 40 transient floor translations (S2) in the anterior direction were applied 2 s after an auditory warning signal (S1), under conditions with or without fixation of the ankle. Activity of the frontal postural…
Timings of attentional switching to perturbation and postural preparation during transient forward or backward floor translation
BACKGROUND: Relationships between the timings of attentional switching and postural preparation were investigated using a choice-reaction paradigm with transient floor translation (S2), with the direction indicated by a warning auditory signal (S1). METHODS: Thirteen healthy young adults participated in this study. S2 started 2 s after S1 onset while standing on the platform. The platform moved forward when S1 was a high tone, and backward when S…
Developmental changes in shortening of pro-saccade reaction time while maintaining neck flexion position
BACKGROUND: We investigated developmental changes in shortening of pro-saccade reaction time while maintaining neck flexion. METHODS: Subjects comprised 135 children (3-14 years) and 29 young adults (19-23 years). Children were divided into six groups in 2-year age strata. Pro-saccade reaction tasks for 30 s were performed in neck rest and flexion positions. Reaction times under each position were averaged in every 10-s period. RESULTS: Under nec…
Age-related changes in the activation timing of postural muscles to the prime mover muscle for bilateral arm flexion during standing
Background We aimed to obtain the standard values of age-related changes in the activation timing of postural muscles to the prime mover muscle (anterior deltoid [AD]) for bilateral arm flexion during standing. Methods The study participants were 276 children (aged 3-14 years) and 32 adults (aged 20-26 years). In response to a visual stimulus, participants raised both arms from a fully extended position as quickly as possible, stopped their arms …
Influence of sports experience on distribution of pro-saccade reaction time under gap condition
Background Previous studies indicated that substantial individual variation exists in the distribution of pro-saccade reaction times under gap condition. To investigate the influence of sports experience on the distribution, we examined distribution of the pro-saccade reaction time under overlap and gap conditions, for the basketball club, table tennis club, and non-sporting control groups. Methods Subjects performed pro-saccade tasks under the o…
Motor Control and Adaptation (15 works) · Medicine (11 works) · Balance, Gait, and Falls Prevention (10 works) · Physical medicine and rehabilitation (8 works) · Muscle activation and electromyography studies (7 works) · postural control (7 works) · Psychology (6 works) · Anatomy (5 works) · Audiology (5 works) · Effects of Vibration on Health (4 works)