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The pelvic floor in women may be the only area of the body where the positive effect of physical activity has been questioned. The aim of this narrative review is to present two widely held opposing hypotheses on the effect of general exercise on why is age difference in a relationship bad pelvic floor and to discuss the evidence for each. Hypothesis 1: by strengthening the pelvic floor muscles PFM and decreasing the levator hiatus, exercise decreases the risk of urinary incontinence, anal incontinence and pelvic organ prolapse, but negatively affects the ease and safety of childbirth.
Hypothesis 2: by overloading and stretching the PFM, exercise not only increases the risk of these disorders, but also makes labor and childbirth easier, as the PFM do not obstruct the exit of the fetus. Key findings of this review endorse aspects of both hypotheses. Exercising women generally have similar or stronger PFM strength and larger levator ani muscles than non-exercising women, but this does not seem to have a greater risk of obstructed labor or childbirth.
Additionally, women that specifically train their PFM while pregnant are not more likely to have outcomes associated with obstructed labor. Mild-to-moderate physical activity, such as walking, decreases the risk of urinary incontinence but female athletes are about three times more likely to have urinary incontinence compared to controls. There is some evidence that strenuous exercise may cause and worsen pelvic organ prolapse, but data are inconsistent.
Both intra-abdominal pressure associated with exercise and PFM strength vary between activities and between women; thus the threshold for optimal or negative effects on the pelvic floor almost certainly differs from person to person. Our review highlights many knowledge gaps that need to be understood to understand the full effects of strenuous and non-strenuous activities on pelvic floor health. The Physical Activity Guidelines Advisory Committee Report concluded that health benefits of regular physical activity include reduced risk of excessive weight gain, improved cognitive function, reduced risk of dementia and reduced risk of cancers in various sites [ 3 ].
In addition, physical activity reduces the risk of progression of some chronic conditions, such as osteoarthritis, hypertension, and type 2 diabetes. Hence, staying physically active throughout the lifespan is of great importance for health and well being. Women and men differ in key areas of anatomy and physiology relevant to sports why is age difference in a relationship bad, but perhaps of greatest difference is the often over-looked pelvic floor.
Indeed, the pelvic floor in women may be the only area of the body where the positive effect of physical activity has been questioned. The pelvic floor consists of muscles and connective tissues ligaments and fascia that need to work together to form a structural support for the pelvic organs to prevent urinary leakage or protrusion of the pelvic organs. Pelvic floor dysfunction may lead to common conditions such as urinary incontinence UIanal incontinence AI and pelvic organ prolapse POP [ 4 ].
Given that these conditions affect between one in three to one in four why is age difference in a relationship bad [ 56 ], understanding whether physical exercise might predispose to, or prevent, dysfunction of the pelvic floor, and thus these conditions, is important. Additionally, the conditions themselves, especially UI, may cause women to stop exercising or be one of many barriers to continuing lifelong regular physical activity [ 7why is age difference in a relationship bad ]. As a consequence, women and society bear the cost of inactivity and UI, both substantial [ 910 ].
Known risk factors for pelvic floor disorders are pregnancy and vaginal childbirth, older age and obesity [ what are the interrelationships in an ecosystem ]. Strenuous work does tinder make fake profiles exercise has also been widely debated as a possible risk factor.
Adequate function of the pelvic floor including the pelvic floor muscles PFMconnective tissue and nervous system, is crucial in counteracting the increases in intra-abdominal pressure IAP and ground reaction forces that occur during physical activity, and well-functioning PFM may compensate for weak connective tissue. General exercise training strengthens the pelvic floor. This may reduce the levator hiatus area by causing hypertrophy and shortening of the surrounding muscles, thereby lifting the pelvic floor and the internal organs into a higher pelvic location.
On the other hand, it is also theoretically possible that these changes could negatively impact labor and childbirth by making it more difficult for the fetus to descend with pushing. General exercise training overloads, stretches and weakens the pelvic floor. This hypothesis is based on the fact that physical activity increases IAP, and if the pelvic floor muscles are not able to co-contract quickly or strongly enough to counteract this increased pressure or withstand the ground reaction forces, the levator hiatus could become wider, stretching and weakening the muscles.
The aim of this narrative literature review is to describe and discuss the evidence supporting or refuting these two hypotheses, including how exercise influences PFM strength, muscle fatigue, pelvic floor morphology, pelvic floor disorders, and labor and birth variables. We based our paper on previous review articles in this area and articles from the reference lists of why is age difference in a relationship bad articles [ 1314151617181920 ] and on an updated search on February Of these studies, 23 and 35, respectively, did not address the areas of interest, and 20 studies were represented in both searches, leaving 40 published studies from PubMed for review, in addition to the review manuscripts.
We also included seven manuscripts not found in our search to incorporate papers we were aware are not included in the PubMed database. IAP changes throughout the course of the day, increasing with position changes, movement, breathing, and abdominal wall contraction. Two exercise modalities may increase IAP to a greater extent than others and thus possibly affect the pelvic floor: strenuous strength training, such as weight and power lifting, and why does a girl suddenly go cold activities, such as jumping and running.
Strength training and weight lifting are characterized by short-duration bursts of impact with possible high increases in IAP, but low ground reaction forces [ 15 ]. High-impact what is union set in math with example are associated with a high number of impacts from both ground reaction forces and probably smaller increases of IAP.
Continent women automatically pre- or co-contract the PFM before and during impact activities and are not aware of this automatic function [ 21 ]. This would in theory also be possible during some strength-training exercises or heavy lifting of short duration, but this has not yet been investigated. However, in long-lasting activities with repeated impacts close together in time, such as running or high-impact aerobics, it would be impossible for women to perform voluntary PFM contractions for each step or movement.
To have an understanding of the forces the pelvic floor must withstand, it is useful to consider these forces during propagation. Hay [ 23 ] estimated maximum vertical ground reaction forces during different activities and reported those during running to be 3—4 times the body weight, jumping, 5—12 times, landing from a front somersault, 9 times, landing from double back somersault, 14 times, and long-jump, 16 times. Since then, many authors have investigated vertical ground reaction forces and confirmed substantial forces that occur during running, walking and jumping.
While out of the scope of the current review, it is instructive to summarize one example. Seegmiller et al. While most women are unlikely to experience these types of loads on the pelvic floor, artistic gymnasts may do so during the landing phases of many of their routines. Measuring pressures in the bladder, rectum, or upper vagina provides a closer approximation of the forces experienced by the pelvic floor, although discounting acceleration forces.
James was one of the first to measure bladder pressures during physical activity, using an air-filled balloon in the bladder [ 25 ]. Recorded pressures during coughing, jumping and running and bending over to the floor were90 and 20 cmH 2 O, respectively. Subsequent studies explain the divine theory of origin of state clearly that maximal IAP values have a very wide range amongst women doing the same standardized activity [ why is age difference in a relationship bad ].
In addition, maximal IAPs vary across studies for the same activity, in part related to the instrumentation with which IAP is measured and how maximal IAP is constructed, as well as to differences between populations [ 2728 ]. Breathing pattern is generally not standardized, which can also influence IAP [ 29 ]. IAPs across studies also vary because both total that is, maximal IAP from atmospheric pressure baseline and net difference between maximal IAP and a baseline value, usually standing are used to operationalize IAP but usually not specified in reports.
Examples of IAPs during dynamic activities and abdominal training are summarized in Tables 1 and 2. Others have also pointed out that activities generally restricted after surgery may generate lower IAPs than unrestricted activities. For example, mean maximal IAP was greater with standing up from a chair than it was for abdominal crunches, climbing stairs, sit-ups and many lifting activities [ 31 ]. Similarly, lifting 20 lbs generated less IAP than standing up from a chair [ 32 ]. Coughing generates higher IAP than most exercises Table 1.
During an abdominal crunch, the IAP increased 8. We found only two studies measuring the acute effect of one bout of exercise. In contrast, immediately after one bout of strenuous exercise in women that habitually performed CrossFit and one bout of non-strenuous exercise in recreational controls, there was no change in maximum voluntary PFM contraction, but arithmetic mean and geometric mean formula was a decrease in vaginal resting pressure in both groups, as well as slightly worse vaginal support [ 35 ].
We are aware of no prospective studies following women from onset of exercise over months or years of training to evaluate the effect of exercise training on PFM strength. Some studies have compared PFM strength between exercising women and controls. These studies provide mixed evidence for answering the question of whether exercisers have stronger or weaker PFM than non-exercisers. Compared to why is age difference in a relationship bad healthy women, 49 high-impact athletes had stronger PFM than these controls [ 36 ].
In a group of 41 women, PFM strength correlated with aerobic capacity and also with habitual physical activity measured by questionnaire [ 37 ]. In a study of 70 healthy women, PFM strength did not differ between those habitually engaged in CrossFit and controls [ 35 ]. Another study of postmenopausal women reported no linear relation between physical activity and PFM strength after adjusting for other factors [ 40 ].
Similarly, there were no differences in PFM strength between 30 women with no clinical diagnosis of pelvic floor disorders who were Pilates practitioners and sedentary controls [ 41 ]. In a cross-sectional analysis of primiparous women 1 year postpartum, there were no significant associations between PFM force and measures of strength and fitness, including grip strength, trunk flexor endurance duration, percent body fat, or self-reported physical activity [ 42 ].
Similarly, another cross-sectional study found no association between physical activity level, assessed by questionnaire, and vaginal resting pressure, PFM strength and endurance [ 43 ]. However, there was a weak positive association between physical activity level in continent women and a weak negative association in incontinent women [ 43 ]. Some researchers have used vaginal surface electromyography EMG to measure activity attributed to the PFM during various activities.
In another study of 16 healthy women, EMG activity during jumps occurring while drop landing and mini-trampolining was above that of the PFM onset threshold and pre- and co-contraction activity increased significantly with jumping height and body weight force [ 45 ]. A review of 28 studies about PFM activity during impact activities, concluded that the timing of PFM activity in relation to the activity of other trunk muscles appears to be important in maintaining continence and what are the 4 symbiotic relationships women with SUI have delayed PFM activity during impact activities [ 46 ].
These results were somewhat contradicted by findings that five incontinent football players had significantly greater mathematical function definition muscle thickness at the midvagina on MRI than seven continent players [ 49 ]. Another study found no difference in vaginal support between 35 women habitually engaged in CrossFit and controls [ 35 ].
In primiparas, there was no difference in levator hiatus area at 21 weeks gestation between women who reported exercising for 30 or more minutes at least three times per week and non-exercisers, but at 37 weeks, exercisers had significantly larger levator hiatus area both at rest and during Valsalva [ 38 ]. Breathing pattern was not standardized.
There were no differences between women with or without SUI, but parous women displayed significantly larger depression than nulliparous women [ 50 ]. We identified no randomized controlled trials RCTs evaluating the effect of physical activity or general exercise training on UI that did not also include pelvic floor muscle training PFMT. Numerous cross-sectional and fewer cohort studies have evaluated the association between exercise and UI.
Mild-to-moderate physical activity, largely represented by walking, appears to decrease the risk of UI. In cross-sectional analyses, current leisure activity is associated with lower odds of SUI; conversely the lack of exercise increases these odds [ 5152535455 ]. A large body of the literature supports a high prevalence of UI in women participating in sports. Prevalence rates are not directly comparable between studies due to different instruments and definitions of UI and population differences.
The prevalence is generally greater in high-impact athletes, such as trampolinists, gymnasts, volleyball players, and long-distance runners [ 15 ]. For example, Fernandes et al. There are why is age difference in a relationship bad data on the incidence of UI after initiating exercise or sports training. A prospective study found no difference in the prevalence of SUI before and after a 6-week program of summer military training completed by young nulliparous women [ 68 ].
An adjusted linear regression model showed that PFM strength, rather than being a regular exerciser, was associated with continence. In another study, athletes gymnasts, distance runners and basketball players had significant higher UI prevalence than sedentary women, despite also having greater PFM strength [ 36 ]. Somewhat counter-intuitively, incontinent athletes in a different study had stronger PFM than continent athletes [ 69 ].
In a study questioning U. Olympians, 20 years after they competed, there were no differences in UI prevalence between a high-impact group former gymnasts and track and field and a low-impact group swimmers [ 70 ]. Similarly, in a 15 year follow-up study, former Norwegian elite athletes, including those participating in high-impact sports, were not more likely to report UI later in life than controls [ 71 ].
However, UI early in life was strongly associated with UI at 15 year follow-up. In contrast, in a population of middle-aged women, the predicted probability of SUI rose linearly, though modestly, in those that recalled exceeding 7. Few studies were found on exercise and AI.
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