scholarly journals Digit Variability in Carotenoid Scores Obtained with the Veggie Meter: A Pilot Study (P02-001-19)

2019 ◽  
Vol 3 (Supplement_1) ◽  
Author(s):  
Velarie Ansu ◽  
Stephanie Dickinson ◽  
Alyce Fly
Keyword(s):  
Indiana University ◽  
Left Hand ◽  
Funding Sources ◽  
Right Hand ◽  
Period Data ◽  
The Mean ◽  
The Right ◽  
Post Hoc ◽  
Main Effects ◽  
Mean Square Errors

Abstract Objectives To determine which digit and hand have the highest and lowest skin carotenoid scores, to compare inter-and-intra-hand variability of digits, and to determine if results are consistent with another subject. Methods Two subjects’ first(F1), second(F2), third(F3) and fifth(F5) digits on both hands were measured for skin carotenoids with a Veggie Meter, for 3 times on each of 18 days over a 37-day period. Data were subjected to ANOVA in a factorial treatment design to determine main effects for hand (2 levels), digits (4), and days (18) along with interactions. Differences between digits were determined by Tukey's post hoc test. Results There were significant hand x digit, hand x day, digit x day, and hand x digit x day interactions and significant simple main effects for hand, digit, and day (all P < 0.001). Mean square errors were 143.67 and 195.62 for subject A and B, respectively, which were smaller than mean squares for all main effects and interactions. The mean scores ± SD for F1, F2, F3, and F5 digits for the right vs left hands for subject A were F1:357.13 ± 45.97 vs 363.74 ± 46.94, F2:403.17 ± 44.77 vs. 353.20 ± 44.13, F3:406.76 ± 43.10 vs. 357.11 ± 45.13, and F5:374.95 ± 53.00 vs. 377.90 ± 47.38. For subject B, the mean scores ± SD for digits for the right vs left hands were F1:294.72 ± 61.63 vs 280.71 ± 52.48, F2:285.85 ± 66.92 vs 252.67 ± 67.56, F3:268.56 ± 57.03 vs 283.22 ± 45.87, and F5:288.18 ± 34.46 vs 307.54 ± 40.04. The digits on the right hand of both subjects had higher carotenoid scores than those on the left hands, even though subjects had different dominant hands. Subject A had higher skin carotenoid scores on the F3 and F2 digits for the right hand and F5 on the left hand. Subject B had higher skin carotenoid scores on F5 (right) and F1 (left) digits. Conclusions The variability due to hand, digit, and day were all greater than that of the 3 replicates within the digit-day for both volunteers. This indicates that data were not completely random across the readings when remeasuring the same finger. Different fingers displayed higher carotenoid scores for each volunteer. There is a need to conduct a larger study with more subjects and a range of skin tones to determine whether the reliability of measurements among digits of both hands is similar across the population. Funding Sources Indiana University.

Effects of ipsilateral and crossed eye-hand dominance on catching performance in prepubescents

2017 ◽  
Vol 4 (5) ◽  
pp. 41-48
Author(s):  
M. Akif Ziyagil ◽  
Inci Kesilmiş ◽  
Nevzat Demirci ◽  
M. Melih Kesilmiş
Keyword(s):  
Physical Activity ◽  
Hand Dominance ◽  
Mean Values ◽  
Left Hand ◽  
Left Handed ◽  
Eye Dominance ◽  
Right Hand ◽  
Significant Difference ◽  
The Mean ◽  
The Right

This study investigates the effects of ipsilateral and crossed hand-eye dominance on one and both hands catching performance (OHCP and BHCP) in participants aged 10 to 13 years. The combined groups including hand and eye dominance consisted of right handed-right eyed (RHRE), right handed-left eyed (RHLE), left handed-left eyed (LHLE) and left handed-right eyed (LHRE), respectively. In this study the mean values were only higher in the favor of LHLE females in left hand OHCP from 2 and 3 m distances. In other side, LHLE males had a higher mean values not only in left hand OHCP from 2 and 3 meters but also in the right hand OHCP from 3 meters. No significant difference was observed in BHCP among four groups in both genders. In conclusion, ipsilateral handeye dominance is an advantage for OHCP compared to cross dominance. Also left side had an advantage compare to the right side in OHCP. Keywords: Hand dominance; physical activity; gender.

Determining ergonomic forms for rollable display devices

2018 ◽  
Vol 62 (1) ◽  
pp. 1017-1017
Author(s):  
Songil Lee ◽  
Donghee Choi ◽  
Hyeeun Choi ◽  
Kitae Hwang ◽  
Seonghyeok Park ◽  
...  
Keyword(s):  
Regression Model ◽  
Display Device ◽  
Display Devices ◽  
Left Hand ◽  
Hand Grip ◽  
Right Hand ◽  
The Mean ◽  
Pulling Force ◽  
The Right ◽  
Hand Length

Following commercialization of curved displays, foldable and rollable displays are under development. The rollable display should be unrolled first using a pulling motion to access the screen. The corresponding pulling force acting on the lateral grip (bezel) areas of the device should be higher than the spring force typically used for retracting the screen. The objective of the current study was to examine the effects of hand length and device thickness on the required lateral grip area sizes of the rollable display device and the grip comfort for the screen unrolling motion, and to ultimately determine the ergonomic bezel width and device thickness associated with high grip comfort. Thirty young individuals with the mean (SD) age of 22.1 (2.2) years participated in this study. All participants were recruited from a university population, right-handed, and healthy without any musculoskeletal diseases on their upper limbs. This study was a 3 (Hand length) × 3 (Device thickness) mixed factorial design. Hand length (HandS/M/L; between-subjects factor) consisted of HandS (short hand length; ≤162.5 mm, 10th percentile), HandM (medium hand length; 174.6–177.3 mm, 45th–55th percentile), and HandL (large hand length; ≥189.4 mm, 90th percentile). Device thickness (DeviceThin/Medium/Thick; within-subjects factor) consisted of DeviceThin (2 mm thick), DeviceMedium (6 mm thick), and DeviceThick (10 mm thick). Each of three rollable display device prototypes was comprised of Acrylonitrile Butadiene Styrene plastic panels, a roll of paper screen (to show a default screen), a roller, and a spring (to roll the screen). The thickness of the right side of the device was manipulated, whereas that of the left side was fixed at 10 mm to house the three parts described above (a rollable screen, a roller, and a spring). When fully unrolled, the sizes of each prototype and the screen were 140H × 300W × 2.5R (mm) and 130H × 260W (mm), respectively. The prototype was equally split into two sides, with each grip part (bezel) 20 mm wide. A 1 mm-interval grid image (130H × 20W (mm)) was attached to each bezel to measure the bezel area involved in gripping. The initial pulling force for unrolling the screen was 2.5N. A desk (150 × 60 × 73 cm) and a height-adjustable chair were used. First, participants unrolled and rolled the prototypes freely for five min to familiarize themselves with how to use the prototypes. A randomly assigned prototype was evaluated three times as follows. Each seated participant repeated unrolling and rolling motions with the assigned prototype until they found the most comfortable grip. While the screen was fully unrolled using the most comfortable grip, each grip area was photographed from four different directions. Then, each individual rated the grip comfort of each hand on a 100mm Visual Analogue Scale (0: Very uncomfortable, 100: Very comfortable). A paper-and-pencil method was used for comfort ratings. The entire procedure to evaluate the three prototypes required about 30 min per participant. Regardless of hand length, the width of the grip area from the device side edge was up to 20 mm. The mean (SD) height of the grip areas for HandS/M/L was 108.8 (3.1), 116.8 (2.5), 124.2 (2.3), respectively. Regardless of hand length, the lower end of the grip area reached the bottom of the device, while the upper end moved more upward with hand lengths. The thinner the device was, the smaller the difference in the grip areas was across the three hand-length groups. In addition, grip comfort increased with device thickness. When gripping a thinner object, the grip posture becomes more deviated from a relaxed hand posture to make more flexions of the thumb and fingers. The simple linear regression model for the left-hand grip comfort on the right-hand grip comfort was constructed (R2 = 0.68 and p-values <0.001): Y(left-hand grip comfort)=23.1+0.74×X(right-hand grip comfort) This regression model indicates that the two grip comfort ratings were positively correlated. In addition, the right-hand grip comfort ratings were lower than the left-hand grip comfort ratings. The mean (SD) comfort ratings for the left and right hands were 75.1 (19.2) and 78.6 (17.3), respectively, with p-value for a paired t-test < 0.001. Thus, device thickness appears to be an important design dimension that influences the grip comfort associated with screen unrolling. There are some limitations in the current study. First, the initial pulling force required for screen unrolling was fixed at 2.5N. The screen unrolling motion involves external rotation of the shoulders. To the authors’ knowledge, no study has investigated an ergonomic force range for this motion. Second, some measurement errors may have been involved in manually identifying the grip area based on the photographs. Using touch sensors would provide more accurate and faster measurements. Finally, it is necessary to analyze the grip areas more in detail. The current study investigated the effects of hand length and device thickness on the grip area and the grip comfort of each hand for rollable display devices. The findings suggested that regardless of hand length, the side bezel of a rollable display device should be at least 20 mm wide and the device should be sufficiently thick (preferably 10 mm thick) to ensure high grip comfort. These findings will be useful when designing ergonomic rollable display devices with high grip comfort.

Surgeon’s radiation exposure during percutaneous vertebroplasty

2006 ◽  
Vol 4 (2) ◽  
pp. 106-109 ◽  
Author(s):  
Michael Synowitz ◽  
Juergen Kiwit
Keyword(s):  
Radiation Exposure ◽  
Percutaneous Vertebroplasty ◽  
Prospective Trial ◽  
Reduction Rate ◽  
Dose Area Product ◽  
Left Hand ◽  
Right Hand ◽  
The Mean ◽  
Area Product ◽  
The Right

Object In this study the authors evaluated levels of radiation exposure to surgeons’ protected and unprotected hands during fluoroscopically assisted vertebroplasty. Methods The amount of radiation administered to 30 patients during 41 procedures in a controlled prospective trial over 6 months was assessed, comparing radiation exposure to the right and left hands in two neurosurgeons. Effective skin doses were evaluated using thermoluminescent finger dosimeters (ring dosimeters). The ratios of finger dosimeter exposure were compared between the glove-protected and unprotected left hands of two surgeons and both unprotected right hands. In addition, dose-area product (DAP) and fluoroscopy times were recorded in all patients. The mean treatment-effective dose to the surgeons’ hands was 0.49 ± 0.4 mSv in the glove-protected left hand and 1.81 ± 1.31 mSv in the unprotected left hand (p < 0.05). The mean effective hand doses were 0.59 ± 0.55 mSv in the unprotected right hand of the glove-protected surgeon and 0.62 ± 0.55 mSv in the unprotected right hand of the control surgeon. The total corresponding fluoroscopy time was 38.55 minutes for the protected surgeon and 41.23 minutes for the unprotected one (p > 0.05). Lead glove shielding resulted in a radiation dose reduction of 75%. The total DAP for all procedures was 256,496 mGy/cm2 and 221,408 mGy/cm2 (p >0.05) for the protected and unprotected surgeons, respectively. Conclusions This study emphasizes the importance of surgeons wearing lead glove protection on their leading hands during percutaneous vertebroplasty procedures and demonstrates a 75% reduction rate of exposure to radiation.

scholarly journals ANTHROPOMETRIC ASSESSMENT OF DIGIT LENGTHS AND DIGIT RATIOS OFVITILIGO SUBJECTS IN PORT HARCOURT, RIVERS STATE

2021 ◽  
Vol 9 (11) ◽  
pp. 907-911
Author(s):  
Gwunireama I.U. ◽  
◽  
Ogoun T.R. ◽  
Adheke O.M. ◽  
Wariboko L.I. ◽  
...  
Keyword(s):  
Standard Deviation ◽  
Significant Positive Correlation ◽  
The Body ◽  
Positive Correlation ◽  
Left Hand ◽  
Right Hand ◽  
Study Results ◽  
The Mean ◽  
The Right ◽  
The Relationship

Vitiligo is a skin pigmentation disorder that is caused by a loss of melanocytes, characterized by white spots around certain parts of the body. The aim of this study was to investigate the relationship between digit length, digit (2D:4D) ratio and vitiligo among vitiligo patients within a south-southern Nigeria. Informed consents were obtained from 98 vitiligo adult subjects (69 females and 29 males) in the age range of 18 – 50 years. The measurements that were obtained were the digit lengths of second and fourth fingers for both hands using the digital vernier caliper. The mean and standard deviation values were calculated for all measurements. A Pearson correlation was used to analyse the relationship between the various measurements for both hands in the study. Results showed that the mean ± standard deviation of the various parameters for the female category. Right 2D length was 6.67± 7.53cm, left 2D length was 6.68 ± 7.32cm, right 4D length and left 4D length were 6.86 ± 8.57cm and 6.89 ± 8.50cm respectively. While, the mean and standard deviation values for right and left 2D:4D ratios for the female category were 0.98 ± 0.15 and 0.98 ± 0.12 respectively. In the males, right 2D length was 6.66 ± 9.66cm, left 2D length was 6.64 ± 9.86cm, right 4D length and left 4D length were 6.99 ± 10.09cm and 7.03± 10.40cm respectively. While, the mean and standard deviation values for right and left 2D:4D ratios for the male category were 0.95 ± 0.03 and 0.95 ± 0.03 respectively. In the females for the right hand, there was a significant positive correlation between 2D length and 4D length (r = 0.761, p = 0.000) while there was a significant negative correlation between 4D length and digit ratio (r = -0.473, p = 0.000) at p < 0.01. For the left hand, there was a significant positive correlation between 2D length and 4D length (r = 0.783, p = 0.000). In the males for the right hand, there was a significant positive correlation between 2D length and 4D length (r = 0.976, p = 0.000). For the left hand, there was a significant positive correlation between 2D length and 4D length (r = 0.981, p = 0.000).It can be concluded that the knowledge of 2D:4D ratio among vitiligosubjects could be helpful in clinical anthropometry however, more research has to be done considering that the sample size of this study is relatively small.

Modulating pain with augmented reality

2012 ◽  
Vol 3 (3) ◽  
pp. 192-192
Author(s):  
G. Christoffersen ◽  
L. Petrini ◽  
L. Arendt-Nielsen
Keyword(s):  
Pain Perception ◽  
Heat Pain ◽  
Cold Pain ◽  
Left Hand ◽  
Control Subjects ◽  
Hand Size ◽  
Right Hand ◽  
The Right ◽  
Main Effects ◽  
The Relationship

Abstract Background/aims Being able to modulate pain through visual input raises the possibility that visually distorting body size also will reduce pain. The aim of the present study was to investigate whether experimental cold/heat pain could be modulated through a visual illusion of an increased/decreased hand size and whether pain perception correlated with the perceived sense of control of movement. Methods 20 healthy right-handed volunteers were recruited. Hand sizes were modulated through an AR setting designed to act as a mirror. Four conditions were included: (1) No AR setting; (2) left/right hands were the same size; (3) left hand enlarged; (4) left hand decreased. Pain thresholds (PT) for both hands were alternately assessed using two thermodes, placed on each palmar side of the hands. After each condition subjects rated the following statement: “I could control the movements of my left/right hand”. Results Heat pain: no main effect for conditions or hands (left/right). Cold pain: Significant main effects for conditions, but not for hands – condition (2) is significantly more painful than all conditions. Control of movements when the left hand is stimulated: the more control subjects have of right hand in condition (4), the higher the cold PT for the left hand in conditions (1) and (2). Control of movements when the right hand is stimulated: the more control subjects have of the right hand in condition (4), the higher the heat PT in the right hand for condition (2). Conclusions Visual illusions can modulate pain, however the modulating factors do not only depend on the size of the limbs that are been viewed but also on how much control subjects feel they have of the movements in their hands-specifically the relationship to the right hand condition (4) seems to have an analgesic effect for cold pain and heat pain.

scholarly journals Índice de longitud digital 2D:4D en deportes de pelota (2D:4D Digital Length Index in Ball Sports)

Retos ◽  
2020 ◽  
pp. 284-288
Author(s):  
Santiago Ramos Bermúdez ◽  
Angélica M. García ◽  
Carlos Federico Ayala ◽  
Héctor Haney Aguirre Loaiza
Keyword(s):  
Body Mass Index ◽  
Body Mass ◽  
Ring Finger ◽  
Sports Performance ◽  
Left Hand ◽  
Competence Level ◽  
Manual Pressure ◽  
The Mean ◽  
The Right ◽  
Post Hoc

  El índice de longitud digital (2D:4D) es un biomarcador del equilibrio entre testosterona T y los estrógenos fetales, por tanto, predictor del desarrollo de masa muscular y hemoglobina, relacionadas con el rendimiento deportivo. Aunque el 2D:4D se ha asociado con el deporte, se requiere comparar el 2D:4D entre deportes. Con el objetivo de establecer diferencias del 2D:4D entre deportistas de deportes de pelota, fueron estudiados 204 deportistas (Medad= 25.9, DE= 10.0), competidores a nivel nacional colombiano e internacional. Se autorreportó talla y masa corporal para calcular Índice de Masa Corporal IMC. También se midió fuerza de prensión manual, longitud de los dedos índice y anular de ambas manos. El estudio fue avalado por comité de bioética. Los resultados del Anova señalaron que el 2D:4D fue similar en ambas. El promedio 2D:4D en ambas manos mostró diferencias [F(9, 194)=2.06, p= 0.34, η2=.29, 1-β=.82]. El análisis de longitud por cada dedo mostró diferencias: En la mano derecha 2Dd [F(9, 194)= 14.8, p= .00, η2=.63, 1-β=.95], 4Dd [F(9, 194)= 12.6, p= .000, η2=.60, 1-β=.99]. En la mano izquierda, 2Di [F(9, 194)= 18.5, p= .000, η2= .68, 1-β=1.0], 4Di [F(9, 194)= 13.2, p= .000, η2=.61, 1-β=.1.0]. El análisis post-hoc de Tukey-B del 4Dd, 2Di, y 4Di mostró cuatro subconjuntos homogéneos, mientras, el 2Dd cinco subconjuntos. En conclusión, se observaron diferencias en el 2D:4D del promedio de ambas manos. La longitud de los dedos 2Dd-i y 4Dd-i muestra diferencias en los deportes de pelota, principalmente, bádminton, softbol, y squash.  Abstract. The digital ratio length (2D:4D) is a biomarker of the balance between testosterone (T) and fetal estrogens, therefore, it is a predictor of muscular mass and hemoglobin development, associated with sports performance. Although the 2D:4D has been associated with sports, it is required to compare 2D:4D among sports. With the aim of establishing differences of the 2D:4D between athletes of ball sports, 204 Colombian athletes (Mage= 25.9, SD= 10.0) with national and international competence level were observed. Height and body mass were self-reported in order to calculate Body Mass Index (BMI). Also, strength manual pressure and length of index and ring finger of both hands were measured. This study was approved by the bioethics committee. The Anova results indicated that 2D:4D was similar in both hands. The mean 2D:4D of both hands showed differences [F(9, 194)= 2.06, p= .034, η2=.29, 1-β=.82]. The analysis of each finger showed differences: In the right-hand (r), 2Dr [F(9, 194)= 14.8, p= .000, η2=.63, 1-β=.95], 4Dr [F(9, 194)= 12.6, p= .000, η2=.60, 1-β=.99]. In the left-hand (l), 2Dl [F(9, 194)= 18.5, p= .000, η2=.68, 1-β=1.0], 4Di [F(9, 194)= 13.2, p= .000, η2=.61, 1-β=.1.0]. The post-hoc Tukey-B analysis of the 4Dr and 2Dr-4Dl fingers showed four homogenous subsets, while the 2Dr five subsets. In conclusion, differences of the 2D:4D mean of both hands were observed. The fingers length 2D-4Dr-l showed differences among ball sports, mostly, badminton, softball, and squash. 

Interactions of Speech and Manual Movement in a Syncopated Task

2007 ◽  
Vol 105 (2) ◽  
pp. 447-457 ◽  
Author(s):  
Nobuyuki Inui
Keyword(s):  
Speech Production ◽  
Undergraduate Students ◽  
Motor Task ◽  
Left Hand ◽  
Right Hand ◽  
The Mean ◽  
Interresponse Interval ◽  
Mean Differences ◽  
The Right ◽  
Manual Movement

The present study examined interactions of speech production and finger-tapping movement, using a syncopated motor task with two movements in 10 male right-handed undergraduate students ( M age = 21.0 yr.; SD =1.4). On the syncopated task, participants were required to produce one movement exactly midway between two other movements (target interresponse interval: 250 msec.). They were divided into two groups, the tap-preceding group and speech-preceding group. The author observed that the right hand showed a more variable peak force and intertap interval than the left hand in the speech-preceding group, indicating an asymmetrical interference of two movements. On the other hand, the mean differences between onsets of speech and tapping movement were shorter than 250 msec. over all conditions (the shortest mean difference was 50 msec.), suggesting a mutual entrainment of two movements. An asymmetry of entrainment was observed in the speech-preceding group, in which speech production was more strongly entrained with movements of the right hand than with those of the left hand.

Editorial Note

1946 ◽  
Vol 11 (1) ◽  
pp. 2-2
Keyword(s):  
Editorial Note ◽  
Speech Sounds ◽  
Left Hand ◽  
Hand Column ◽  
Right Hand ◽  
Infant Speech ◽  
The Right

In the article “Infant Speech Sounds and Intelligence” by Orvis C. Irwin and Han Piao Chen, in the December 1945 issue of the Journal, the paragraph which begins at the bottom of the left hand column on page 295 should have been placed immediately below the first paragraph at the top of the right hand column on page 296. To the authors we express our sincere apologies.

The State Policy towards the Homeless in Moldova between the ‘Left Hand’ and the ‘Right Hand’. The Case of Chișinău Shelter

Südosteuropa ◽  
2019 ◽  
Vol 67 (2) ◽  
pp. 175-195
Author(s):  
Petru Negură
Keyword(s):  
Homeless People ◽  
Severe Disabilities ◽  
The State ◽  
Small Scale ◽  
Left Hand ◽  
Right Hand ◽  
Binary Approach ◽  
The One ◽  
The Right ◽  
Depth Interviews

Abstract The Centre for the Homeless in Chișinău embodies on a small scale the recent evolution of state policies towards the homeless in Moldova (a post-Soviet state). This institution applies the binary approach of the state, namely the ‘left hand’ and the ‘right hand’, towards marginalised people. On the one hand, the institution provides accommodation, food, and primary social, legal assistance and medical care. On the other hand, the Shelter personnel impose a series of disciplinary constraints over the users. The Shelter also operates a differentiation of the users according to two categories: the ‘recoverable’ and those deemed ‘irrecoverable’ (persons with severe disabilities, people with addictions). The personnel representing the ‘left hand’ (or ‘soft-line’) regularly negotiate with the employees representing the ‘right hand’ (‘hard-line’) of the institution to promote a milder and a more humanistic approach towards the users. This article relies on multi-method research including descriptive statistical analysis with biographical records of 810 subjects, a thematic analysis of in-depth interviews with homeless people (N = 65), people at risk of homelessness (N = 5), professionals (N = 20) and one ethnography of the Shelter.

scholarly journals The Left Hand Doesn’t Know What the Right Hand Is Doing—or Does It?

Cell Reports ◽  
2016 ◽  
Vol 17 (11) ◽  
pp. 2809-2810
Author(s):  
Jody C. Culham
Keyword(s):  
Left Hand ◽  
Right Hand ◽  
The Right
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