Whole body reaction time among cricket, hockey and baseball players and its comparison with their age and sex matched controls

2019 ◽  
Vol 10 (2) ◽  
pp. 20-25
Author(s):  
Govind B Taware ◽  
◽  
Umesh S Torgalli ◽  
Keyword(s):  
Reaction Time ◽  
Whole Body ◽  
Baseball Players ◽  
Age And Sex

Postural Preparation to Making a Step: Is There a “Motor Program” for Postural Preparation?

2007 ◽  
Vol 23 (4) ◽  
pp. 261-274 ◽  
Author(s):  
Adriana M. Degani ◽  
Alessander Danna-Dos-Santos ◽  
Mark L. Latash
Keyword(s):  
Reaction Time ◽  
Simple Reaction Time ◽  
Center Of Pressure ◽  
Motor Program ◽  
Whole Body ◽  
Single Motor ◽  
Simple Reaction ◽  
Specific Manner ◽  
Young Subjects ◽  
Straight Ahead

We tested the hypothesis that a sequence of mechanical events occurs preceding a step that scales in time and magnitude as a whole in a task-specific manner, and is a reflection of a “motor program.” Young subjects made a step under three speed instructions and four tasks: stepping straight ahead, down a stair, up a stair, and over an obstacle. Larger center-of-pressure (COP) and force adjustments in the anteriorposterior direction and smaller COP and force adjustments in the mediolateral direction were seen during stepping forward and down a stair, as compared with the tasks of stepping up a stair and over an obstacle. These differences were accentuated during stepping under the simple reaction time instruction. These results speak against the hypothesis of a single motor program that would underlie postural preparation to stepping. They are more compatible with the reference configuration hypothesis of whole-body actions.

Comparison of a 12-Week Whole-Body Exergaming Program on Young Adults: Differentiation in Flexibility, Muscle Strength, Reaction Time, and Walking Speed Between Sexes

2018 ◽  
Vol 29 (7) ◽  
pp. 424-432 ◽  
Author(s):  
Yeşim Bakar ◽  
Alper Tuğral ◽  
Alp Özel ◽  
Yasin D. Altuntaş
Keyword(s):  
Reaction Time ◽  
Muscle Strength ◽  
Walking Speed ◽  
Whole Body ◽  
Video Gaming ◽  
Walk Test ◽  
Time Machine ◽  
Visual Reaction Time ◽  
Post Intervention ◽  
Visual Reaction

This study aimed to investigate the effects of exergaming on flexibility, muscle strength, reaction time, and walking speed of adults within sex differences. Fifty-four individuals participated in a 12-week exergaming program. Three 30-min sessions were conducted each week. Baseline and post-intervention assessments were done using the sit-and-reach and bend-over tests for flexibility, hand-held dynamometer for muscle strength, auditory and visual reaction time machine for reaction time, and 5-meter walk test for walking speed. There were no significant changes in the sit-and-reach, bend-over test, and auditory-visual reaction time for either gender ( p > .05) with the intervention. Walking speed and muscle strength improved after exergaming in both sexes ( p < .05). The study showed that the video gaming intervention led to significant and equal improvements in muscle strength and walking speed for both sexes; however, it had no impact on flexibility and auditory-visual reaction time.

scholarly journals Concussion History and Neuromechanical Responsiveness Asymmetry

2020 ◽  
Vol 55 (6) ◽  
pp. 594-600 ◽  
Author(s):  
Gary B. Wilkerson ◽  
Dustin C. Nabhan ◽  
Ryan T. Crane
Keyword(s):  
Reaction Time ◽  
Elite Athletes ◽  
Area Under The Curve ◽  
Musculoskeletal Injury ◽  
Whole Body ◽  
Lateral Asymmetry ◽  
Good Discrimination ◽  
Cross Sectional ◽  
Concussion History ◽  
Sensorimotor Processes

Context Detection of subtle changes in brain sensorimotor processes may enable clinicians to identify athletes who would derive the greatest benefit from interventions designed to reduce the risk for future injury and progressive neurologic or musculoskeletal dysfunction. Objective To develop a generalizable statistical model for identifying athletes who possess subtle alterations in sensorimotor processes that may be due to previous concussion. Design Cross-sectional study. Setting Residential Olympic Training Center sports medicine clinic. Patients or Other Participants A primary cohort of 35 elite athletes and a secondary cohort of 40 elite athletes who performed identical tests the preceding year. Intervention(s) Two upper extremity tests of visual-motor reaction time and 2 tests of whole-body reactive agility were administered. The whole-body tests required lateral or diagonal responses to virtual-reality targets, which provided measures of reaction time, speed, acceleration, and deceleration. Main Outcome Measure(s) Sport-related concussion history, which was reported by 54% (n = 19) of the athletes in the primary cohort and 45% (n = 18) of the athletes in the secondary cohort. Results Univariable analyses identified 12 strong predictors of sport-related concussion history, which we combined to create a composite metric with maximum predictive value. Composite lateral asymmetry for whole-body reactive movements and persisting effects of previous musculoskeletal injury yielded a logistic regression model with exceptionally good discrimination (area under the curve = 0.845) and calibration (predicted-observed probabilities within 7 subgroups: r = 0.959, P = .001). Application of the derived model to compatible data acquired from another cohort of elite athletes demonstrated very good discrimination (area under the curve = 0.772) and calibration (within 8 subgroups: r = 0.849, P = .008). Conclusions Asymmetry in whole-body reactive movement capabilities may be a manifestation of a subtle abnormality in the functional connectivity of brain networks that might be relevant to previously reported associations between sport-related concussion history and musculoskeletal injury occurrence.

scholarly journals Insulin-like Growth Factor 1 and Adiponectin and Associations with Muscle Deficits, Disease Characteristics, and Treatments in Rheumatoid Arthritis

2015 ◽  
Vol 42 (11) ◽  
pp. 2038-2045 ◽  
Author(s):  
Joshua F. Baker ◽  
Joan Marie Von Feldt ◽  
Sogol Mostoufi-Moab ◽  
Woojin Kim ◽  
Elena Taratuta ◽  
...  
Keyword(s):  
Rheumatoid Arthritis ◽  
Growth Factor ◽  
Disease Activity ◽  
Muscle Mass ◽  
Quantitative Computed Tomography ◽  
Whole Body ◽  
Insulin Like Growth Factor ◽  
Cross Sectional ◽  
Muscle Density ◽  
Age And Sex

Objective.Rheumatoid arthritis (RA) is associated with low muscle mass and density. The objective of our study was to evaluate associations between 2 serum biomarkers [insulin-like growth factor 1 (IGF-1) and adiponectin] and skeletal muscle in RA.Methods.Whole-body dual energy X-ray absorptiometry measures of the appendicular lean mass index (ALMI; kg/m2) and total fat mass index (kg/m2), as well as the peripheral quantitative computed tomography measures of the lower leg muscle and fat cross-sectional area (CSA; cm2) and muscle density (an index of fat infiltration) were obtained from 50 participants with RA, ages 18–70 years. Multivariable linear regression analyses evaluated associations between body composition and levels of adiponectin and IGF-1, adjusted for age, sex, and adiposity.Results.Greater age was associated with higher adiponectin (p = 0.06) and lower IGF-1 (p = 0.004). Eight subjects had IGF-1 levels below the reference range for their age and sex. These subjects had significantly lower ALMI and muscle CSA in multivariable models. Lower IGF-1 levels were associated with greater clinical disease activity and severity, as well as low ALMI, muscle CSA, and muscle density (defined as 1 SD below normative mean). After adjusting for age and sex, greater adiponectin levels were associated with lower BMI (p = 0.02) as well as lower ALMI, and lower muscle CSA, independent of adiposity (p < 0.05). Only greater Health Assessment Questionnaire scores were significantly associated with lower adiponectin levels.Conclusion.Low IGF-1 and greater adiponectin levels are associated with lower muscle mass in RA. Lower IGF-1 levels were seen in subjects with greater disease activity and severity.

Combined effect of whole-body vibration and ambient lighting on human discomfort, heart rate, and reaction time

2018 ◽  
Vol 91 (5) ◽  
pp. 537-545 ◽  
Author(s):  
Mohammad Reza Monazzam ◽  
Esmaeil Shoja ◽  
Seyed Abolfazl Zakerian ◽  
Abbas Rahimi Foroushani ◽  
Mohsen Shoja ◽  
...  
Keyword(s):  
Heart Rate ◽  
Reaction Time ◽  
Whole Body Vibration ◽  
Combined Effect ◽  
Whole Body ◽  
Body Vibration ◽  
Ambient Lighting

scholarly journals Effect of 6-12 Weeks of Systemic Glucocorticoids on Bone Mineral Density in Children

2021 ◽  
Author(s):  
Kalpana Panda ◽  
Soumya Dey ◽  
Namrita Sachdev ◽  
Tribhuvan Pal Yadav
Keyword(s):  
Bone Mineral Density ◽  
Bone Mineral ◽  
Whole Body ◽  
Categorical Variables ◽  
Care Hospital ◽  
Mineral Density ◽  
Systemic Steroids ◽  
Systemic Glucocorticoids ◽  
Age And Sex

Introduction: Prolonged use of systemic steroids in children is associated with many side-effects including effect on Bone Mineral Density (BMD). Effect of more than three months of systemic steroids on BMD has been studied in children but not the effect of 6-12 weeks duration of steroid. Aim: To evaluate the effect of 6-12 weeks of systemic glucocorticoids on BMD in children. Materials and Methods: A longitudinal observational study was conducted at a Tertiary Care Hospital. Dual Energy X-ray Absorptiometry (DEXA) of Whole Body (WB), Lumbar Spine (LS) and Distal Radius (DR) were done at baseline, end of steroid therapy or third month whichever was earlier and end of six months, on 30 patients receiving systemic steroid (Nephrotic Syndrome (NS)-7, Systemic Onset Juvenile Idiopathic Arthritis (SOJIA)-12, Tubercular Meningitis-11). Age and sex adjusted values of Bone Mineral Content (BMC), BMD and Z scores were analysed. Bone densitometric parameters of Total Body Less the Head (TBLH) were derived from WB values. X-rays of whole spine (antero-posterior and lateral view) were done at baseline and follow-up. Equal number of age and sex matched healthy controls were subjected to biochemical and DEXA scans at baseline. Continuous and categorical variables were compared using Student’s t-test and Fisher-exact test, respectively. Pairwise comparison over period of time was done using Bonferroni correction. Results: Bone densitometric parameters of cases and controls were comparable at baseline. At follow-up statistically significant decrease in BMD was found at all three sites. A statistically significant negative correlation was found between cumulative dose of steroid and duration of steroid treatment with Z score of TBLH. No vertebral fractures were detected at baseline or follow-up. Conclusion: Use of systemic glucocorticoids for 6-12 weeks negatively affects bone mineralisation, not only during therapy but even three months after stopping it.

scholarly journals Evaluation of Reaction Time on Karate Athletes UKM Syiah Kuala University

2022 ◽  
Vol 3 (01) ◽  
pp. 70-78
Author(s):  
Syamsulrizal Syamsulrizal ◽  
Tengku Riski Afrianda ◽  
Muhammad Iqbal ◽  
Yeni Marlina ◽  
Zahara Zahara
Keyword(s):  
Reaction Time ◽  
Female Athletes ◽  
Whole Body ◽  
Male Athletes ◽  
Increase Reaction Time ◽  
Average Value ◽  
Reaction Test ◽  
Time Test ◽  
Reaction Time Test ◽  
Karate Athletes

The  purpose  of  the study. Reaction time is a determining factor in sports, especially in martial arts. The purpose of this study is to evaluate the reaction time of UKM Karate athletes at Syiah Kuala University. Materials and methods. The approach in this study uses a quantitative approach. The sampling technique used purposive sampling, which means this technique is used to achieve certain goals. The samples in this study were athletes from UKM karate at Syiah Kuala University. The data collection technique was carried out by using the whole body reaction test to measure the reaction time of the athlete's arms and legs. Results. results of the research in the form of a whole body reaction test, the results using the formula for the average value and the total percentage can be concluded: (1) The arm reaction time test with the total average value for male athletes is 0.169 seconds and female athletes are 0.173, and the highest percentage is in the very good category, amounting to 87% for male and female athletes, 75% in the very good category and (2) the limb reaction time test has an average value of 0.269 seconds for male athletes and female athletes of 0.361 seconds, with the highest percentage value amounted to 100% in the good category for male athletes and for female athletes it was in the sufficient category with a percentage of 50%. Conclusions. the analysis show that most athletes have been able to maintain and increase reaction time well, to be able to improve and maintain it, regular and continuous training is needed

Upper-Extremity Perceptual-Motor Training Improves Whole-Body Reactive Agility Among Elite Athletes With History of Sport-Related Concussion

2020 ◽  
pp. 1-6
Author(s):  
Gary B. Wilkerson ◽  
Dustin C. Nabhan ◽  
Ryan T. Crane
Keyword(s):  
Reaction Time ◽  
Upper Extremity ◽  
Elite Athletes ◽  
Whole Body ◽  
Training Effect ◽  
Characteristic Analysis ◽  
Significant Group ◽  
Reactive Agility ◽  
Conflict Effect ◽  
History Of

Context: Sport-related concussion (SRC) elevates risk for subsequent injury, which may relate to impaired perceptual-motor processes that are potentially modifiable. Objective: To assess a possible upper-extremity (UE) training effect on whole-body (WB) reactive agility performance among elite athletes with history of SRC (HxSRC) and without such history of SRC. Design: Cohort study. Setting: Residential training center. Participants: Elite athletes (12 males and 8 females), including 10 HxSRC and 10 without such history of SRC. Intervention: One-minute training sessions completed 2 to 3 times per week over a 3-week period involved verbal identification of center arrow direction for 10 incongruent and 10 congruent flanker test trials with simultaneous reaching responses to deactivate illuminated buttons. Main Outcome Measures: Pretraining and posttraining assessments of UE and WB reactive responses included flanker test conflict effect (incongruent minus congruent reaction time) and WB lateral average asymmetry derived from reaction time, speed, acceleration, and deceleration in opposite directions. Discrimination was assessed by receiver operating characteristic analysis, and training effect was assessed by repeated-measures analysis of variance. Results: Pretraining discrimination between HxSRC and without such history of SRC was greatest for conflict effect ≥80 milliseconds and WB lateral average asymmetry ≥18%. Each athlete completed 6 training sessions, which improved UE mean reaction time from 767 to 646 milliseconds (P < .001) and reduced mean conflict effect from 96 to 53 milliseconds (P = .039). A significant group × trial interaction was evident for WB lateral average asymmetry (P = .004), which was reduced from 24.3% to 12.5% among those with HxSRC. Conclusions: Suboptimal perceptual-motor performance may represent a subtle long-term effect of concussion that is modifiable through UE training, which appears to improve WB reactive capabilities.

A study of auditory reaction time in cricket, hockey and baseball players

2019 ◽  
Vol 10 (2) ◽  
pp. 15-19
Author(s):  
Govind B Taware ◽  
◽  
Umesh S Torgalli ◽  
Keyword(s):  
Reaction Time ◽  
Baseball Players ◽  
Auditory Reaction Time
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