scholarly journals No change in oxytocin level before a human intergroup competition: study among Polish players before rugby and handball matches

2020 ◽  
Author(s):  
Slawomir Koziel ◽  
Marek Kociuba ◽  
Zofia Ignasiak ◽  
Andrzej Rokita ◽  
Ireneusz Cichy ◽  
...  
Keyword(s):  
Repeated Measures ◽  
Colorimetric Detection ◽  
Repeated Measurements ◽  
Outcome Variable ◽  
Repeated Measures Design ◽  
Competition Study ◽  
Time Periods ◽  
Post Hoc ◽  
Rugby Players ◽  
Oxytocin Level

AbstractObjectivesThe aim of the present study was to assess the changes in urinary oxytocin concentration during the period between five days before, and on the day of match, among rugby and handball players.MethodsThe study used a repeated measures design with the relative oxytocin level as the outcome variable measured at two subsequent points of time, viz., on five days before as well as on the days of matches. Nine male rugby players with a mean age of 27.62 years (SD = 4.21) and 18 male handball players with a mean age of 17.03 years (SD = 0.57) participated. Urinary oxytocin level was measured by ELISA immunoassay as a ratio to the concentration of creatinine [mg/ml] measured through colorimetric detection. Differences in oxytocin level were assessed by ANOVA with repeated measurements.ResultsThe OT/CRE levels significantly differed between the type of player (rugby or handball) but not between times of measurements. Tukey’s post-hoc tests revealed that significant differences were only between OT/CRE level in a day of match in rugby players and in 5 days before match in handball players (p<0.05).ConclusionThere was no change in oxytocin levels during the time periods between five days before and on the day of a match, in either of the two kinds of players. The change in oxytocin might be traceable during the match but not before a match and thus perhaps depends on a more subtle context of competition, but not on the assumption of competition.

scholarly journals Conditional Process Analysis in Two-Instance Repeated-Measures Designs

2019 ◽  
Author(s):  
Amanda Kay Montoya
Keyword(s):  
Mediation Analysis ◽  
Repeated Measures ◽  
Process Analysis ◽  
Repeated Measurements ◽  
Process Models ◽  
Outcome Variable ◽  
Moderation Analysis ◽  
Repeated Measures Design ◽  
Independent Variable ◽  
Conditional Process Analysis

Conditional process models are commonly used in many areas of psychology research as well as research in other academic fi?elds (e.g., marketing, communication, and education). Conditional process models combine mediation analysis and moderation analysis. Mediation analysis, sometimes called process analysis, investigates if an independent variable influences an outcome variable through a specific?c intermediary variable, sometimes called a mediator. Moderation analysis investigates if the relationship between two variables depends on another. Conditional process models are very popular because they allow us to better understand how the processes we are interested in might vary depending on characteristics of different individuals, situations, and other moderating variables. Methodological developments in conditional process analysis have primarily focused on the analysis of data collected using between-subjects experimental designs or cross-sectional designs. However, another very common design is the two-instance repeated-measures design. A two-instance repeated-measures design is one where each subject is measured twice; once in each of two instances. In the analysis discussed in this dissertation, the factor that differentiates the two repeated measurements is the independent variable of interest. Research on how to statistically test mediation, moderation, and conditional process models in these designs has been minimal. Judd, Kenny, and McClelland (2001) introduced a piece-wise method for testing for mediation, reminiscent of the Baron and Kenny causal steps approach for between-participant designs. Montoya and Hayes (2017) took thispiece-wise approach and translated it to a path-analytic approach, allowing for a quanti?cation of the indirect e?ect, more sophisticated methods of inference, and the extension to multiple mediator models. Moderation analysis in these designs has been described by Judd, McClelland, and Smith (1996), Judd et al. (2001), and Montoya (in press). However, the generalization to conditional process analysis, or moderated mediation, remains unknown. Describing this approach is the purpose of this dissertation.

scholarly journals Hippotherapy—An Intervention to Habilitate Balance Deficits in Children With Movement Disorders: A Clinical Trial

2012 ◽  
Vol 92 (5) ◽  
pp. 707-717 ◽  
Author(s):  
Debbie J. Silkwood-Sherer ◽  
Clyde B. Killian ◽  
Toby M. Long ◽  
Kathy S. Martin
Keyword(s):  
Movement Disorders ◽  
Repeated Measures ◽  
Control Group ◽  
Friedman Analysis ◽  
Repeated Measures Design ◽  
Clinical Observations ◽  
Balance Deficits ◽  
And Function ◽  
Post Hoc ◽  
Balance Problems

Background Clinical observations have suggested that hippotherapy may be an effective strategy for habilitating balance deficits in children with movement disorders. However, there is limited research to support this notion. Objective The purposes of this study were to assess the effectiveness of hippotherapy for the management of postural instability in children with mild to moderate balance problems and to determine whether there is a correlation between balance and function. Design A repeated-measures design for a cohort of children with documented balance deficits was used. Methods Sixteen children (9 boys and 7 girls) who were 5 to 16 years of age and had documented balance problems participated in this study. Intervention consisted of 45-minute hippotherapy sessions twice per week for 6 weeks. Two baseline assessments and 1 postintervention assessment of balance, as measured with the Pediatric Balance Scale (PBS), and of function, as measured with the Activities Scale for Kids—Performance (ASKp), were performed. Results With the Friedman analysis of variance, the PBS and the ASKp were found to be statistically significant across all measurements (P&lt;.0001 for both measures). Post hoc analysis revealed a statistical difference between baseline and postintervention measures (P≤.017). This degree of difference resulted in large effect sizes for PBS (d=1.59) and ASKp (d=1.51) scores after hippotherapy. A Spearman rho correlation of .700 indicated a statistical association between PBS and ASKp postintervention scores (P=.003). There was no correlation between the change in PBS scores and the change in ASKp scores (rs=.13, P&gt;.05). Limitations Lack of a control group and the short duration between baseline assessments are study limitations. Conclusions The findings suggest that hippotherapy may be a viable strategy for reducing balance deficits and improving the performance of daily life skills in children with mild to moderate balance problems.

Comparison of music stimuli to support mindfulness meditation

2019 ◽  
pp. 030573561987849 ◽  
Author(s):  
Abbey L Dvorak ◽  
Eugenia Hernandez-Ruiz
Keyword(s):  
Repeated Measures ◽  
Mindfulness Meditation ◽  
Analysis Of Covariance ◽  
Auditory Stimuli ◽  
Harmonic Progression ◽  
Repeated Measures Design ◽  
Significant Difference ◽  
Within Subjects ◽  
Mindful Attention Awareness Scale ◽  
Post Hoc

The purpose of this study was to compare the effectiveness of and preference for different auditory stimuli in supporting mindfulness meditation. Undergraduate non-musicians ( N = 57) listened to four different auditory stimuli guiding them in a mindfulness meditation: script only (i.e., Script), steady beat (i.e., Beat), beat and harmonic progression (i.e., Harmony), and beat, harmony, and melody (i.e., Melody). This study used a within-subjects repeated-measures design with the four conditions counterbalanced and randomized across participants. Participants rated responses using the Mindful Attention Awareness Scale (MAAS), completed the Absorption in Music Scale (AIMS), and ranked auditory stimuli according to preference and usefulness for mindfulness meditation. A repeated-measures analysis of covariance (ANCOVA) on the MAAS scores, using the AIMS as a covariate, indicated no statistically significant difference between auditory stimuli. However, with the AIMS removed, the analysis revealed significant differences between stimuli, indicating that levels of absorption in music may moderate participants’ responses to auditory stimuli for mindfulness meditation. Friedman analyses of variance (ANOVAs) and post hoc analyses indicated that participant rankings of usefulness and preference were significantly different among conditions, with the Melody and Harmony conditions ranked highest.

Determining the usability and technology acceptance of a powered and automated cargo management system during ladder lifting tasks: A pilot study

Work ◽  
2021 ◽  
pp. 1-10
Author(s):  
Antonio Miguel Cruz ◽  
Jessica Murphy ◽  
Avneet Kaur Chohan ◽  
Lili Liu ◽  
Adriana Maria Rios Rincon
Keyword(s):  
Technology Acceptance ◽  
Repeated Measures ◽  
Management System ◽  
Automated System ◽  
Secondary Outcome ◽  
Outcome Variable ◽  
P Value ◽  
Traditional System ◽  
Repeated Measures Design ◽  
Strongly Agree

BACKGROUND: Evidence for the adoption and acceptance of assistive devices for ladder lifting tasks by workers is scarce. OBJECTIVE: This study aims to investigate the technology acceptance and usability of a powered and automated cargo management system (RazerLift ®) used by workers who need to lift ladders as part of their daily duties, as compared to mechanical cargo management systems (traditional). METHODS: We used a one-way repeated measures design in this study. Our primary outcome variable was a usability performance measurement measured as time (in seconds) for unloading and loading ladders using both systems. Our secondary outcome was technology acceptance, measured using questionnaires with a 5-point Likert scale: “strongly disagree (1)” to “strongly agree (5)”. RESULTS: The participants conducted the combined unloading and loading time using the powered and automated system (RazerLift ®) 20.85 seconds faster than the traditional system (p-value = 0.000, t-value (df) = –5.730 (6), d = 2.713). Overall, the RazerLift ® system (mean = 44.28, SD 5.58) had a higher technology acceptance compared to the traditional system (mean = 30.00, SD 7.91), (p = 0.041, t-value (df) = 6.589 (6), d = 4.60). CONCLUSIONS: The RazerLift ® was more time efficient compared with the traditional system, and (2) the RazerLift ® was superior in terms of technology acceptance compared to the traditional system.

scholarly journals The Self-Other Divergence Effect for Doping Likelihood: Mediation by Guilt and Moderation by Moral Agency and Values

2020 ◽  
Vol 42 (5) ◽  
pp. 417-423 ◽  
Author(s):  
Christopher Ring ◽  
Maria Kavussanu ◽  
Benjamin Walters
Keyword(s):  
Repeated Measures ◽  
Moral Agency ◽  
The Self ◽  
Repeated Measures Design ◽  
In Doping ◽  
Quasi Experimental ◽  
Divergence Effect ◽  
Independent Variable ◽  
Rugby Players

Objectives: Self–other divergence refers to individuals judging themselves to be different from others. The authors investigated doping-related self-other divergence.Design: The authors used a quasi-experimental repeated-measures design to compare the effects of an independent variable (perspective: self, other) on doping likelihood and guilt. Method: Rugby players rated doping likelihood and guilt in situations describing two perspectives: self (their own behavior and feelings) and other (another player’s behavior and feelings). They also completed measures of moral agency, identity, perfectionism, and values (moral traits). Results: Doping likelihood was lower and guilt was higher for self-based ratings compared with other-based ratings. The self–other difference in doping likelihood was mediated by guilt and moderated by moral traits (larger for athletes with higher agency and values). Agency and values were more strongly related to self than other doping likelihood. Conclusions: Other-referenced measures differed from self-referenced measures of doping likelihood and guilt, indicating that it is wrong to presume equivalence of measurement.

Effects of prolonged exercise in highly trained traumatic paraplegic men

1987 ◽  
Vol 63 (5) ◽  
pp. 1846-1852 ◽  
Author(s):  
G. C. Gass ◽  
E. M. Camp
Keyword(s):  
Repeated Measures ◽  
Prolonged Exercise ◽  
Minute Ventilation ◽  
Venous Blood ◽  
Co2 Production ◽  
Maximal Heart Rate ◽  
Trained Subjects ◽  
Repeated Measures Design ◽  
Exercise Period ◽  
Post Hoc

This study investigated the cardiovascular and metabolic responses to prolonged wheelchair exercise in a group of highly trained, traumatic paraplegic men. Six endurance-trained subjects with spinal cord lesions from T10 to T12/L3 underwent a maximal incremental exercise test in which they propelled their own track wheelchairs on a motor-driven treadmill to exhaustion to determine maximal O2 uptake (VO2max) and related variables. One week later each subject exercised in the same wheelchair on a motorized treadmill at 60–65% of VO2max for 80 min in a thermoneutral environment (dry bulb 22 degrees C, wet bulb 17 degrees C). Approximately 10 ml of venous blood were withdrawn both 20 min and immediately before exercise (0 min), after 40 and 80 min of exercise, and 20 min postexercise. Venous blood was analyzed for hematocrit (Hct), hemoglobin (Hb), and lactate, and the separated plasma was analyzed for glucose, K+, Na+, Cl-, free fatty acid (FFA), and osmolality. VO2, CO2 production (VCO2), minute ventilation (VE), respiratory exchange ratio (R), net efficiency, and wheelchair strike rate were determined at four intervals throughout the exercise period. Data were analyzed with an analysis of variance repeated-measures design and a Scheffe post hoc test. VO2max was 47.5 +/- 1.8 (SE) ml.min-1.kg-1 with maximal VE BTPS and maximal heart rate (HR) being 100.1 +/- 3.8 l/min and 190 +/- 1 beats/min, respectively. During prolonged exercise there were no significant changes in VO2, VCO2, VE, R, net efficiency, wheelchair strike rate, and lactate, glucose, and Na+ concentrations. Significant increases occurred in HR, FFA, K+, Cl-, osmolality, Hb, and Hct throughout exercise.(ABSTRACT TRUNCATED AT 250 WORDS)

Variations of NICU Sound by Location and Time of Day

2010 ◽  
Vol 29 (2) ◽  
pp. 87-95 ◽  
Author(s):  
Sherry Matook ◽  
Mary Sullivan ◽  
Amy Salisbury ◽  
Robin Miller ◽  
Barry Lester
Keyword(s):  
Sound Pressure Level ◽  
Repeated Measures ◽  
Sound Pressure ◽  
Night Shift ◽  
Time Of Day ◽  
Pressure Level ◽  
Outcome Variable ◽  
Repeated Measures Design ◽  
Sound Levels ◽  
Main Outcome Variable

Purpose/Aims. The primary aim of this study was to identify time periods of sound levels >45 decibels (dB) in a large Level III NICU. The second aim was to determine whether there were differences in decibel levels across the five bays of the NICU, the four quadrants within each bay, and two 12-hour shifts.Design. A repeated measures design was used. Bay, quadrant, and shift were randomly selected for sampling. Staff and visitors were blinded to the location of the sound meter, which was placed in one of five identical wooden boxes and was preset to record for 12 hours.Sample. Sound levels were recorded every 60 seconds over 40 12-hour periods, 20 during the day shift and 20 during the night shift. Total hours measured were 480. Data were collected every other day during a three-month period. Covariates of staffing, infant census, infant acuity, and medical equipment were collected.Main Outcome Variable. The main outcome variable was sound levels in decibels, with units of measurement of energy equivalent sound level (Leq), peak instantaneous sound pressure level, and maximum sound pressure level during each interval for a total of 480 hours.Results. All sound levels were >45 dB, with average readings ranging from 49.5 to 89.5 dB. The middle bay had the highest levels, with an Leq of 85.74 dB. Quadrants at the back of a bay were louder than quadrants at the front of a bay. The day shift had higher decibel levels than the night shift. Covariates did not differ across bays or shifts.

Effect of elastic lumbosacral supports on lumbar spine mechanical stresses

2001 ◽  
Vol 2 (4) ◽  
pp. 251-256
Author(s):  
Jim Hackney
Keyword(s):  
Lumbar Spine ◽  
Mechanical Stress ◽  
Dimensional Analysis ◽  
Analysis Of Variance ◽  
Repeated Measures ◽  
Mechanical Stresses ◽  
Analysis Program ◽  
Repeated Measures Design ◽  
Conventional Manner ◽  
Post Hoc

Subjects lifted a 6.82 kg weight from the floor to 1.23 meters high using an elastic lumbosacral support worn the conventional way, without a support, and with the support wide side forward. The lifts were analyzed using the "Lift-track" 2 dimensional analysis program, and the results subjected to repeated measures design analysis of variance (ANOVA) and post hoc Bonferroni analysis. This study indicates that use an elastic lumbosacral support is able to influence lifting posture enough to have a significant effect on mechanical stress being placed on the L5-S1 joint in lifting from the floor, if worn with the wide side facing the abdomen. Wearing the support in the conventional manner had no significant effect in reducing the mechanical stress on the lumbar spine.

Recognition Performance of Interrupted Monosyllabic Words: The Effects of Ten Interruption Locations

2015 ◽  
Vol 26 (07) ◽  
pp. 670-677 ◽  
Author(s):  
Richard H. Wilson ◽  
Heather M. Hamm
Keyword(s):  
Duty Cycle ◽  
Repeated Measures ◽  
Recognition Performance ◽  
Significance Level ◽  
Repeated Measures Design ◽  
Monosyllabic Words ◽  
Word Onset ◽  
The Mean ◽  
Pure Tones ◽  
Post Hoc

Background: A previous experiment with 70 interrupted monosyllabic words demonstrated that recognition performance was influenced by the location of an interruption pattern (Wilson, 2014). The interruption paradigm (10 interruptions/sec, 50% duty cycle periodic interruption) was referenced to word onset. The words were interrupted such that alternate 50-msec segments were parsed to separate files. In the 0-msec condition the first on-segment coincided with the word onset, whereas in the 50-msec condition the first on-segment occurred 50 msec after word onset. The 0- and 50-msec conditions were complementary halves. Recognition performance by young listeners was 19% better on the 0-msec condition (86%) than on the 50-msec condition (68%); there were a minority number of words on which the results were just the opposite. A second study using the same interruption paradigm but 300 different words reported similar relations, with 63% correct recognition on the 0-msec condition and 48% on the 50-msec condition (Wilson and Irish, 2015). Both studies suggest the importance that the first 50 msec of the target word has on intelligibility. Purpose: To define in detail the effects that interruption patterns have on word recognition as the interruption pattern was incremented with reference to word onset from 0 to 90 msec in 10-msec steps. Research Design: A repeated-measures design with ten interruption patterns (onset conditions). Study Sample: Twenty-four young listeners (19–29 yr) with normal hearing for pure tones participated in this study. Data Collection and Analyses: Seventy consonant-nucleus-consonant words formed the corpus of materials with 25 additional words used for practice. For each participant, the 700 stimuli (70 words by ten onset conditions) were interrupted (10 interruptions/sec; 50% duty cycle), randomized, and recorded on compact disc in 28, 25-word tracks. Results: The overall mean recognition performance was 80.4% with mean performances for the ten conditions ranging from 73.0% (50-msec condition) to 87.7% (90-msec condition). The mean recognition performances changed systematically, decreasing from the 0-msec condition to the 50-msec condition and then increasing to the 90-msec condition, which formed a U-shaped function of the means. Of the 45 mean paired comparisons (post hoc t-tests with Bonferroni corrections), there were 17 significant differences at the p ≤ 0.001 level, increasing to 31 significant differences when the significance level was increased to the p ≤ 0.01 level. Visual inspection of the 70-word performance functions revealed that 32 words had flat functions, 34 words had U-shaped functions, two functions were rising, one was an inverted V-shape, and one was irregular. Conclusions: First, some words (utterances of those words) were immune to any differential effects of the ten interruption patterns. These words with flat performance functions constituted 46% of the word corpus. Second, 49% of the words exhibited U-shaped performance functions that were always systematic, going from maximum to minimum and back to maximum. These words were thought to be more dependent on the initial consonant to attain maximum performance. The conclusion is that some words are not affected by the location of the interruption pattern (those with flat functions) whereas other words are substantially affected (those with U-shaped functions).

Power of Modified Brown-Forsythe and Mixed-Model Approaches in Split-Plot Designs

Methodology ◽  
2017 ◽  
Vol 13 (1) ◽  
pp. 9-22 ◽  
Author(s):  
Pablo Livacic-Rojas ◽  
Guillermo Vallejo ◽  
Paula Fernández ◽  
Ellián Tuero-Herrero
Keyword(s):  
Repeated Measures ◽  
Statistical Power ◽  
Mixed Model ◽  
Covariance Structure ◽  
Simulation Method ◽  
Future Research ◽  
Repeated Measures Design ◽  
Fixed And Random Effects ◽  
Split Plot ◽  
High Level

Abstract. Low precision of the inferences of data analyzed with univariate or multivariate models of the Analysis of Variance (ANOVA) in repeated-measures design is associated to the absence of normality distribution of data, nonspherical covariance structures and free variation of the variance and covariance, the lack of knowledge of the error structure underlying the data, and the wrong choice of covariance structure from different selectors. In this study, levels of statistical power presented the Modified Brown Forsythe (MBF) and two procedures with the Mixed-Model Approaches (the Akaike’s Criterion, the Correctly Identified Model [CIM]) are compared. The data were analyzed using Monte Carlo simulation method with the statistical package SAS 9.2, a split-plot design, and considering six manipulated variables. The results show that the procedures exhibit high statistical power levels for within and interactional effects, and moderate and low levels for the between-groups effects under the different conditions analyzed. For the latter, only the Modified Brown Forsythe shows high level of power mainly for groups with 30 cases and Unstructured (UN) and Autoregressive Heterogeneity (ARH) matrices. For this reason, we recommend using this procedure since it exhibits higher levels of power for all effects and does not require a matrix type that underlies the structure of the data. Future research needs to be done in order to compare the power with corrected selectors using single-level and multilevel designs for fixed and random effects.

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