If you guessed Asian you're wrong. Apparently black women do. Trust me I'm as surprised as you.
Ethnic differences in pelvic floor muscle strength and endurance in South African women. - PubMed - NCBI
The incidence of urinary incontinence across Asian, black, and white women in the United States. - PubMed - NCBI
Racial Differences in Pelvic Anatomy by Magnetic Resonance Imaging
Comparison of vaginal shapes in Afro-American, caucasian and hispanic women as seen with vinyl polysiloxane casting. - PubMed - NCBI
http://www.justanswer.com/ob-gyn/6d5...-vagina-s.html
Racial Differences in the Structure and Function of the Stress Urinary Continence Mechanism
Full vinyl polysiloxane casts of the vagina were obtained from 23 Afro-American, 39 Caucasian and 15 Hispanic women in lying, sitting and standing positions. A new shape, the pumpkin seed, was found in 40% of Afro-American women, but not in Caucasians or Hispanics. Analyses of cast and introital measurements revealed: (1) posterior cast length is significantly longer, anterior cast length is significantly shorter and cast width is significantly larger in Hispanics than in the other two groups and (2) the Caucasian introitus is significantly greater than that of the Afro-American subject.
The pelvic inlet was wider among 178 white women than 56 African-American women (10.7±0.7 cm compared with 10.0.±0.7 cm, P<.001). The outlet was also wider (mean intertuberous diameter 12.3±1.0 cm compared with 11.8±0.9 cm, P<.001). There were no significant differences between racial groups in interspinous diameter, angle of the subpubic arch, anteroposterior conjugate, levator thickness, or levator hiatus. In addition, among women who delivered vaginally without a sphincter tear, African-American women had more pelvic floor mobility than white women. This difference was not observed among women who had sustained an obstetric sphincter tear.
I think torso length and hip width are pretty good determiners for vagina size. It is not the height of of the women (head to foot) which determines the depth of the vagina.
There is definitely a racial difference and also genetic factors which determine the length of vagina. White women give birth to babies with larger heads "on average" so their hips are "on average" broader, and their vaginal opening is also larger. Black women, actually have smaller vagina's. They give birth to babies with smaller heads and have smaller hips. Black women store more body fat on their buttocks, but their hips are actually smaller (men and women). White people also have longer torso's and white women also have longer vagina's. Asian women have shorter vagina's than both black and white women, have wider openings than black women, but not as large as white women. Unlike penis size, the body size/shape of a woman has an influence on vaginal size. Taller women (longer torso) with wider hips will most likely have longer and deeper set vagina. Torso size/length is more significant than actual height. As for men however, a 6' 8" man may have a smaller penis than a 5' 8" man, just like has ears may also be smaller. External organs are not influenced by body size or height, whereas internal organs are.
Thank you
Dr Prabir Kumar Das.
INTRODUCTION AND HYPOTHESIS:
Limited knowledge exists about pelvic floor muscle (PFM) function in ethnic groups. The aim of this study was to compare PFM strength and endurance in a group of black, white and mixed-race women.
METHODS:
This was a cross-sectional study. Maximum voluntary contraction (MVC) and endurance were measured with a perineometer and vaginal balloon sensor. Two sets of three MVC of the PFM were recorded; resting phase was 5 min. Demographic variables and factors associated with PFM strength were assessed.
RESULTS:
A total of 122 nulliparous black (n = 44), white (n = 44) and mixed-race (n = 34) students participated. PFM of black women were stronger than that of white (p = 0.02) or mixed-race (p < 0.01) women. The MVC of PFM in black women decreased (p = 0.02) between the first and second set of contractions.
OBJECTIVE:
We calculated incidence rates of urinary incontinence by incontinence frequency and type over 4 years in Asian, black, and white women in the United States.
STUDY DESIGN:
Prospective analyses included 76,724 participants aged 37-79 years in the Nurses' Health Study cohorts with no incontinence at baseline.
RESULTS:
The 4-year incidence of incontinence at least monthly was higher in white women (7.3/100 person-years) compared with Asian (5.7/100 person-years; P = .003) and black women (4.8/100 person-years; P < .001). The incidence of at least weekly stress incontinence was significantly lower in black compared with white women (0.1 vs 0.8 per 100 person-years; P < .001). The difference between black and white women in the incidence of any incontinence and stress incontinence remained significant after adjusting for known risk factors (P < .001 for both).
Objective
To compare the structure and function of the urethral sphincter and the urethral support in nulliparous black and white women.
Methods
Eighteen black women (mean age 28.1 years) and 17 white women (mean age 31.3 years) completed this cross-sectional study. The following assessments were made: urethral function using multichannel cystometrics and urethral pressure profilometry, pelvic muscle strength using an instrumented speculum, urethral mobility using the cotton-swab test and perineal ultrasound, and pelvic muscle bulk using magnetic resonance imaging.
Results
Black women demonstrated a 29% higher average urethral closure pressure during a maximum pelvic muscle contraction (154 cm H2O versus 119 cm H2O in the white subjects; P = .008). Although not statistically significant, black women had a 14% higher maximum urethral closure .23) and pressure at rest (108 cm H2O versus 95 cm H2O; P = a 21% larger urethral volume (4818 mm3 versus 3977 mm3; P = .06). In addition, there was a 36% greater vesical neck mobility measured with the cotton-swab test (blacks 49° versus whites 36°; P = .02) and a 42% difference in ultrasonically measured vesical neck mobility during a maximum Valsalva effort (blacks = −17 mm versus whites −12 mm; P = .08).
OBJECTIVE:
The objective of the study was to compare levator and obturator thickness between asymptomatic black and white nulliparas using three-dimensional (3D) magnetic resonance imaging (MRI) color mapping.
STUDY DESIGN:
3D color-mapped MRI of pelvic muscles were evaluated in 22 similar nulliparas (12 black, 10 white). Levator and obturator (OI) were divided into right and left. Levator was subdivided into puborectalis (PR) and ileococcygeus (IC) portions. Maximal thickness of each muscle was recorded and compared between groups. Nonparametric testing was applied, with significance at P = .05.
RESULTS:
Levator thickness was significantly greater in blacks bilaterally (median right PR, 8.5 vs 6.0 mm; P = .001; right IC, 6.5 vs 4.5 mm; P = .002; left PR, 9.5 vs 5.75 mm; P = .0002; left IC, 6.5 vs 5.75 mm; P = .02). Obturator thicknesses were similar (right OI, 20.0 vs 19.5 mm; left OI, 19.25 vs 19.25 mm; P = NS).
CONCLUSION:
Significantly thicker levators but similar obturators were seen in black nulliparas, compared with white nulliparas. These levator differences may influence pelvic floor dysfunction risk. The clinical significance of these findings is under study.
Figured thiswould go in a penis size forum. Penises are meant to go in pussies so it helps to know which ones are smallest and largest.
Ethnic differences in pelvic floor muscle strength and endurance in South African women. - PubMed - NCBI
The incidence of urinary incontinence across Asian, black, and white women in the United States. - PubMed - NCBI
Racial Differences in Pelvic Anatomy by Magnetic Resonance Imaging
Comparison of vaginal shapes in Afro-American, caucasian and hispanic women as seen with vinyl polysiloxane casting. - PubMed - NCBI
http://www.justanswer.com/ob-gyn/6d5...-vagina-s.html
Racial Differences in the Structure and Function of the Stress Urinary Continence Mechanism
Full vinyl polysiloxane casts of the vagina were obtained from 23 Afro-American, 39 Caucasian and 15 Hispanic women in lying, sitting and standing positions. A new shape, the pumpkin seed, was found in 40% of Afro-American women, but not in Caucasians or Hispanics. Analyses of cast and introital measurements revealed: (1) posterior cast length is significantly longer, anterior cast length is significantly shorter and cast width is significantly larger in Hispanics than in the other two groups and (2) the Caucasian introitus is significantly greater than that of the Afro-American subject.
The pelvic inlet was wider among 178 white women than 56 African-American women (10.7±0.7 cm compared with 10.0.±0.7 cm, P<.001). The outlet was also wider (mean intertuberous diameter 12.3±1.0 cm compared with 11.8±0.9 cm, P<.001). There were no significant differences between racial groups in interspinous diameter, angle of the subpubic arch, anteroposterior conjugate, levator thickness, or levator hiatus. In addition, among women who delivered vaginally without a sphincter tear, African-American women had more pelvic floor mobility than white women. This difference was not observed among women who had sustained an obstetric sphincter tear.
I think torso length and hip width are pretty good determiners for vagina size. It is not the height of of the women (head to foot) which determines the depth of the vagina.
There is definitely a racial difference and also genetic factors which determine the length of vagina. White women give birth to babies with larger heads "on average" so their hips are "on average" broader, and their vaginal opening is also larger. Black women, actually have smaller vagina's. They give birth to babies with smaller heads and have smaller hips. Black women store more body fat on their buttocks, but their hips are actually smaller (men and women). White people also have longer torso's and white women also have longer vagina's. Asian women have shorter vagina's than both black and white women, have wider openings than black women, but not as large as white women. Unlike penis size, the body size/shape of a woman has an influence on vaginal size. Taller women (longer torso) with wider hips will most likely have longer and deeper set vagina. Torso size/length is more significant than actual height. As for men however, a 6' 8" man may have a smaller penis than a 5' 8" man, just like has ears may also be smaller. External organs are not influenced by body size or height, whereas internal organs are.
Thank you
Dr Prabir Kumar Das.
INTRODUCTION AND HYPOTHESIS:
Limited knowledge exists about pelvic floor muscle (PFM) function in ethnic groups. The aim of this study was to compare PFM strength and endurance in a group of black, white and mixed-race women.
METHODS:
This was a cross-sectional study. Maximum voluntary contraction (MVC) and endurance were measured with a perineometer and vaginal balloon sensor. Two sets of three MVC of the PFM were recorded; resting phase was 5 min. Demographic variables and factors associated with PFM strength were assessed.
RESULTS:
A total of 122 nulliparous black (n = 44), white (n = 44) and mixed-race (n = 34) students participated. PFM of black women were stronger than that of white (p = 0.02) or mixed-race (p < 0.01) women. The MVC of PFM in black women decreased (p = 0.02) between the first and second set of contractions.
OBJECTIVE:
We calculated incidence rates of urinary incontinence by incontinence frequency and type over 4 years in Asian, black, and white women in the United States.
STUDY DESIGN:
Prospective analyses included 76,724 participants aged 37-79 years in the Nurses' Health Study cohorts with no incontinence at baseline.
RESULTS:
The 4-year incidence of incontinence at least monthly was higher in white women (7.3/100 person-years) compared with Asian (5.7/100 person-years; P = .003) and black women (4.8/100 person-years; P < .001). The incidence of at least weekly stress incontinence was significantly lower in black compared with white women (0.1 vs 0.8 per 100 person-years; P < .001). The difference between black and white women in the incidence of any incontinence and stress incontinence remained significant after adjusting for known risk factors (P < .001 for both).
Objective
To compare the structure and function of the urethral sphincter and the urethral support in nulliparous black and white women.
Methods
Eighteen black women (mean age 28.1 years) and 17 white women (mean age 31.3 years) completed this cross-sectional study. The following assessments were made: urethral function using multichannel cystometrics and urethral pressure profilometry, pelvic muscle strength using an instrumented speculum, urethral mobility using the cotton-swab test and perineal ultrasound, and pelvic muscle bulk using magnetic resonance imaging.
Results
Black women demonstrated a 29% higher average urethral closure pressure during a maximum pelvic muscle contraction (154 cm H2O versus 119 cm H2O in the white subjects; P = .008). Although not statistically significant, black women had a 14% higher maximum urethral closure .23) and pressure at rest (108 cm H2O versus 95 cm H2O; P = a 21% larger urethral volume (4818 mm3 versus 3977 mm3; P = .06). In addition, there was a 36% greater vesical neck mobility measured with the cotton-swab test (blacks 49° versus whites 36°; P = .02) and a 42% difference in ultrasonically measured vesical neck mobility during a maximum Valsalva effort (blacks = −17 mm versus whites −12 mm; P = .08).
OBJECTIVE:
The objective of the study was to compare levator and obturator thickness between asymptomatic black and white nulliparas using three-dimensional (3D) magnetic resonance imaging (MRI) color mapping.
STUDY DESIGN:
3D color-mapped MRI of pelvic muscles were evaluated in 22 similar nulliparas (12 black, 10 white). Levator and obturator (OI) were divided into right and left. Levator was subdivided into puborectalis (PR) and ileococcygeus (IC) portions. Maximal thickness of each muscle was recorded and compared between groups. Nonparametric testing was applied, with significance at P = .05.
RESULTS:
Levator thickness was significantly greater in blacks bilaterally (median right PR, 8.5 vs 6.0 mm; P = .001; right IC, 6.5 vs 4.5 mm; P = .002; left PR, 9.5 vs 5.75 mm; P = .0002; left IC, 6.5 vs 5.75 mm; P = .02). Obturator thicknesses were similar (right OI, 20.0 vs 19.5 mm; left OI, 19.25 vs 19.25 mm; P = NS).
CONCLUSION:
Significantly thicker levators but similar obturators were seen in black nulliparas, compared with white nulliparas. These levator differences may influence pelvic floor dysfunction risk. The clinical significance of these findings is under study.
Figured thiswould go in a penis size forum. Penises are meant to go in pussies so it helps to know which ones are smallest and largest.
