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Urinary incontinence and perineal muscle function in physically active and sedentary elderly women


OBJECTIVE: To identify the presence of urinary incontinence and compare perineal muscle function among physically active and sedentary older women. METHODS: The sample consisted of 39 elderly women, 28 of whom got regular physical activity (AG) and 11 did not (SG). We collected data on risk factors for pelvic floor weakness and the presence of urinary incontinence (UI). The evaluation of perineal function was performed using PERFECT and perineometry. The data were processed with descriptive (simple frequencies, percentages, measures of position and dispersion) and inferential statistics (Chi-square or Fisher Exact Test, when necessary, and Mann-Whitney) with a significance level of 5%. RESULTS: There was a higher mean age (p=0.04) in AG. The occurrence of UI in the sample was 56.4%. Urge UI was associated with SG (p=0.022). All PERFECT variables were higher in AG than SG, with significant differences for the variables "repetitions" (p=0.008) and "fast" (p=0.022). Perineometry revealed that fast twitch fibers (p=0.008) and slow twitch fibers (p=0.05) were higher in the AG. CONCLUSION: AG had better pelvic floor muscle function. However, the prevalence of UI was higher in this group, which suggested the influence of age on the urinary continence mechanism.

pelvic floor; perineum; muscle strength; urinary incontinence; physical activity; elderly

OBJETIVO: Identificar a presença de incontinência urinária (IU) e comparar a função muscular perineal entre idosas praticantes e não-praticantes de atividade física regular. MÉTODOS: Participaram deste estudo 39 idosas, sendo 28 praticantes (GP) e 11 não-praticantes de atividade física regular (GNP). Foram coletados dados referentes aos fatores de risco para enfraquecimento do assoalho pélvico e presença de IU. A avaliação da função perineal foi feita por meio do esquema PERFECT e da perineometria. Utilizou-se estatística descritiva (frequência simples, porcentagem, medidas de posição e dispersão) e inferencial (teste do qui-quadrado ou Exato de Fisher, quando necessário, e teste de Mann-Whitney). O nível de significância adotado foi de 5%. RESULTADOS: A variável idade (p=0,04) apresentou média superior no GP. A ocorrência de IU na amostra foi de 56,4%. A IU de urgência associou-se com o GNP (p=0,022). Todas as variáveis do esquema PERFECT foram superiores entre as idosas do GP em relação ao GNP, com diferença significativa para a variável repetições (p=0,008) e rapidez (p=0,022). Na perineometria, as funções das fibras de contração rápida (p=0,008) e das fibras de contração lenta (p=0,05) foram superiores no GP. CONCLUSÃO: As idosas do GP apresentam melhor função muscular do assoalho pélvico. Entretanto, a prevalência de IU foi maior nesse grupo, sugerindo influência da variável idade no mecanismo de continência urinária.

assoalho pélvico; períneo; força muscular; incontinência urinária; atividade física; idoso

Urinary incontinence and perineal muscle function in physically active and sedentary elderly women

Janeisa F. VirtuosoI; Giovana Z. MazoII; Enaiane C. MenezesIII

IPhysical Therapist

IIDepartment of Physical Education, Universidade do Estado de Santa Catarina (UDESC), Florianópolis, SC, Brazil

IIIPhysical Education Course, UDESC

Correspondence to Correspondence to: Janeisa Franck Virtuoso Rua Pascoal Simone, 348, Coqueiros CEP 88080-350, Florianópolis, SC, Brasil e-mail:


OBJECTIVE: To identify the presence of urinary incontinence and compare perineal muscle function among physically active and sedentary older women.

METHODS: The sample consisted of 39 elderly women, 28 of whom got regular physical activity (AG) and 11 did not (SG). We collected data on risk factors for pelvic floor weakness and the presence of urinary incontinence (UI). The evaluation of perineal function was performed using PERFECT and perineometry. The data were processed with descriptive (simple frequencies, percentages, measures of position and dispersion) and inferential statistics (Chi-square or Fisher Exact Test, when necessary, and Mann-Whitney) with a significance level of 5%.

RESULTS: There was a higher mean age (p=0.04) in AG. The occurrence of UI in the sample was 56.4%. Urge UI was associated with SG (p=0.022). All PERFECT variables were higher in AG than SG, with significant differences for the variables "repetitions" (p=0.008) and "fast" (p=0.022). Perineometry revealed that fast twitch fibers (p=0.008) and slow twitch fibers (p=0.05) were higher in the AG.

CONCLUSION: AG had better pelvic floor muscle function. However, the prevalence of UI was higher in this group, which suggested the influence of age on the urinary continence mechanism.

Keywords: pelvic floor; perineum; muscle strength; urinary incontinence; physical activity; elderly.


During the aging process, the female lower urinary tract begins to show changes such as muscle atrophy due to estrogen deficiency1,2, replacement of muscle tissue by fat tissue3 and a consequent reduction in the contraction strength of pelvic floor muscles4, which may lead to involuntary urine loss.

According to the International Continence Society, urinary incontinence (UI) is defined as the complaint of any involuntary loss of urine. It can be classified as stress UI (SUI) when it is associated with increased intra-abdominal pressure, urge UI (UUI) when combined with a strong desire to urinate or mixed UI (MUI) when both types are present5. The prevalence of urinary incontinence increases with age, occurring in 26.6% of women aged 65 to 74 and in 41.8% of those over 756.

Some strategies can minimize the effects of UI during the aging process. Physical activity acts positively on the continence mechanism because it helps maintain body weight and prevent obesity, since fat can cause chronic elevation of intra-abdominal pressure and weaken pelvic support structures7,8. Ree, Nygaard and Bø9observed that strength training can increase the volume of the pelvic floor muscles, enabling contraction at certain times when there is increased intra-abdominal pressure.

However, some studies10,11 have demonstrated that physical activity in women is a risk factor for developing urinary incontinence, especially during effort, due to increased ground reaction force and, consequently, abdominal pressure, which influences pelvic floor muscles9. Jiang et al.12 claim that loss of functional continence mechanism (bladder support) is related to the frequency of physical exercise, especially high-impact exercise, which compromises pelvic floor support, suspension and restraint mechanisms by means of severe and repeated overload13,14.

In this context, Borin15 evaluated the pelvic floor muscle pressure of female athletes and found that volleyball and basketball players had lower values than sedentary women. However, most studies15,16 that analyze groups of young athletes involved in high-impact physical activity do not associate their findings with the perineal function of moderately active and sedentary elderly women. In addition, the literature suggests that female gender and increasing age are important risk factors for UI17-19.

Given the demographic transition phenomenon referred to as the feminization of aging20, in which the proportion of women in the elderly population is higher than men, as well as the increased participation of women in physical activity programs21, research about the impact of such factors on this population is of increasing importance. Therefore, this study aims to identify the presence of UI and to compare the perineal muscle function of physically active and sedentary elderly women.


Type of study and casuistry

For this descriptive, cross-sectional study22, elderly female volunteers over 60 years of age were selected. The volunteers were divided into two groups: those involved in regular physical activity (AG) and those who were not (i.e., sedentary) (SG).

Each group had different inclusion criteria. AG (n=28) consisted of elderly women who had been participating in physical activity projects sponsored by the Study Group on Advanced Age (GETI) of the Universidade do Estado de Santa Catarina (UDESC), Florianópolis, SC, Brazil and the Physical Activity for Seniors Group of the Centro Federal de Educação Tecnológica (CEFET) for at least six months. The SG (n=11) consisted of elderly women who had not been involved in any form of regular physical exercise for at least six months and who participated in other types of GETI programs such as computer training and singing therapy.

Elderly women reporting damage to the lower urinary tract, pain when urinating or any other indication of urinary tract infection were excluded from the sample.

Instruments and data collection

First, both groups were evaluated using a semi-structured interview that included both open and multiple choice questions on risk factors for pelvic floor muscle weakening, which were divided into the following categories: gynecological, obstetrical, clinical, behavioral, hereditary and anthropometric. The presence of UI symptoms was also identified by the following question, which was posed in Huang et al.23: "During the last year, did you lose urine (unintentionally in your underwear) at least once a month?"

The type of UI was identified by means of two questions: a) "Do you lose urine when coughing, sneezing, pushing or carrying weight?" (a positive response indicated SUI); b) "Do you lose urine before you get to the bathroom after either feeling a strong urge to urinate or without notice?" (a positive response indicated UUI). When both types were present, the case was considered MUI.

Following studies by Mazo24 and Benedetti, Mazo and Barros25, categorization of the elderly women into physically active and sedentary groups was carried out by applying the "Recreational Physical Activity, Sport, Exercise and Leisure" section of the International Physical Activity Questionnaire adapted for the elderly. Women engaged in moderate and/or vigorous physical activity for 150 minutes or more per week were considered active (AG), while women engaged in zero minutes per week of such activity were considered sedentary (SG).

A Plenna digital scale (Wind MEA 07710) was used to determine body mass, and height was measured with a WCS 217 cm stadiometer. To measure the circumference of the last rib and iliac crest, an ISP brand tape measure was used.

For the physical examination, the participant lay on a stretcher in the supine position with her head on a pillow, her hips flexed and slightly abducted, her knees flexed and her feet flat on the stretcher. The following points were evaluated in the exam, as recommended by Chiarapa, Cacho and Alves14 and Moreno26: the tone of the fibrous center of the perineum, anovulvar distance, awareness of pelvic floor muscle contraction and the usage of adductors and gluteus muscles as well as the influence of the lumbosacral joint during this contraction.

While still in this position but having the knees supported with an approximately 20 cm high wedge, a vaginal examination was performed to check for symmetry of the pelvic floor beams and for the presence of prolapse during the Valsalva maneuver. Subsequently, the subjective muscle function of the pelvic floor was evaluated using the PERFECT scheme, which was developed by Bø and Larsen27 and whose objective is to quantify the intensity, duration and support of perineal muscle contraction (Appendix 1 Appendix 1 ).

To objectively measure perineal muscle function, a Perina (QUARK®) perineometer was used. This device uses pressure electromyography to record the action potentials of pelvic floor muscle contractions and translates their intensity into visual signals. It uses an inflatable vaginal probe as a sensor and measures perineal muscle function by pressure activation of the pelvic floor muscles during contraction. The equipment's unit of measure is cm H2O.

The participant remained in the same position during this step as in the vaginal exam. The vaginal probe, protected with a non-lubricated condom, was introduced into the vaginal canal of the participant. After introduction, the insufflator was slowly pressed once until slight resistance was felt. This standard was adopted since no studies describing optimal insufflator pressure could be found in the literature. The central part of the probe was insufflated in this procedure. To correctly determine the perineal muscle contraction pressure, the volunteer was told to relax and, before beginning the contraction, the perineometer was reset so that the central part of the probe could be accommodated to vaginal tone.

Five fast (1 s) perineal contractions were performed with a 5 s interval between each contraction. Five slow perineal contractions were then performed according to the item "Repetitions" in the PERFECT scheme. The same rest interval was used between slow contractions. All contraction values were recorded.

The perineal contractions were performed during expiration and the participants were instructed about correct contraction of the pelvic floor muscles without using the adductors and gluteus muscles. The use of the wedge for knee support also minimized this problem. A single researcher interviewed and evaluated all the participants.

Data treatment

Data were stored in Microsoft Excel® and each participant was registered under a coded number. Statistical analysis was performed using the Statistical Package for Social Sciences (SPSS) v17.0.

Initially, all variables were descriptively analyzed using simple frequency and percentages (categorical variables) and measures of position and dispersion (numerical variables). For association between categorical variables, the chi-square (χ2) test was used, or Fisher's Exact test when necessary. The Mann-Whitney test was used to compare numerical variables between groups. The significance level was set at 5%.

Ethical procedures

This study fulfilled the requirements of resolution 196/96 of the National Health Council of Brazil and was approved by the UDESC Ethics Committee on Human Research under protocol 03/2010.

Upon agreeing to participate in the study, each elderly volunteer signed two copies of an informed consent form, with one copy remaining in the volunteer's possession and the other in the researcher's.


The study sample consisted of 39 elderly women (aged 60 or older): eleven were sedentary (SG) and 28 were physically active (AG). The physical exercise programs in which the AG participated included: cardio-strength training (23; 85.7%), swimming (02; 10.7%), dance (02; 10.7%) and strength training (01; 2.6%).

Regarding sociodemographic data, most of the elderly women in this study were either married (22; 56.4%) or widows (13; 33.7%), completed high school (13; 33.7%) or did not complete middle school (11; 28.2%) and were currently retired (21; 53.8%).

Table 1 compares risk factors and pelvic floor muscle weakening between AG and SG. The groups shared similar characteristics except for age (p=0.040), which was higher in AG. Among anthropometric factors, AG had a higher mean body mass index (BMI) and waist circumference (WC), although not significantly so (p=0.158 and p=0.149, respectively).

Regarding the association between UI symptoms and physical activity (Table 2), 56.4% of the volunteers complained of incontinence, with SUI being the most common type (51.3%). The presence of UUI was reported by 28.2% of the sample and was significantly associated with both AG and SG (χ2=5.25; p=0.022), having a greater tendency in SG (54.5%) (residual adjustment >2.0). Although the presence of MUI was not significant in either group, SG (55.6%) had a higher tendency toward this type of urinary loss. Furthermore, only one AG volunteer reported urine loss during physical exercise.

Regarding the physical examination, no association was observed between categorical variables and the AG and SG groups. However, the high frequency of bladder prolapse (82.4%) and awareness of pelvic floor muscle contraction (78.1%) among women in the AG (Table 3) stand out among the results. Regarding the PERFECT scheme (Strength, Endurance, Repetition, Speed), higher medians for all variables were found in AG, suggesting that pelvic floor function was better in this group. Repetition of sustained contractions (Repetitions) and fast contractions (Speed) was significantly different between AG and SG (U=70.0; p=0.008 and U=81.0; p=0.022, respectively).

The perineometry results indicated that AG fast-twitch fiber function was significantly higher than SG, with medians of 22 and 6.5, respectively (U=70.5; p=0.008). This was also true for slow-twitch fiber function, with a median of 10 in the AG and 2 in the SG (U=91.0; p=0.050).


The age factor, especially in women, tends to be an important cause of urinary problems and involves changes such as a decrease in collagen fibers3, decreased bladder storage capacity and low post-menopause levels of estrogen29. The patient's obstetric and gynecological history can also contribute to the weakening of these muscles30. The occurrence of UI in this study was higher (56.4%) than the values found in a recent study by Smith et al.31, where the prevalence was 29.5% among women aged 60 or older. The high prevalence of UI found in this study could be due to the fact that most of the women interested in participating had a prior urinary incontinence problem and thus were concerned about pelvic floor muscle function. This kind of bias can occur in studies whose sample consists of volunteers. However, when dealing with an elderly population, there are few alternatives when developing a study involving a gynecological examination.

Regarding the types of urinary incontinence, most elderly women reported SUI (50.1%), while 28.2% had UUI and 23.1% MUI. Barros, Lucena and Anselmo1 and Mourão et al.3 explain that the female lower urinary tract shows changes due to estrogen deficiency such as decreased pelvic floor muscle contraction force, which can cause involuntary loss of urine during effort. Furthermore, structural changes to the detrusor muscle that occur during the aging process, such as the development of fibrosis and hypersensitivity to norepinephrine, result in reduced bladder capacity and involuntary contractions32, which cause urinary urgency symptoms and/or UUI.

Regarding physical activity, the results indicated that AG had a higher incidence of urinary incontinence (63.6%), which does not agree with the literature. Smith et al.31 found an association between physical exercise and lower UI rates and encouraged moderate-intensity exercise in order to promote urinary continence. Kikuchi et al.33 found that, compared to those with low physical activity levels, older adults with high physical activity levels had a lower prevalence of UI, which indicates that physical exercise can prevent the occurrence of urinary incontinence.

Regarding the type of UI, SG showed a tendency towards urgency symptoms (p=0.022). In a cross-sectional study, Song et al.34 observed that women who exercised at least once a week were less likely to have UUI. Townsend et al.7 also found lower rates of UUI in women with higher levels of physical activity (OR=0.53; 95% CI=0.31 - 0.90). These results demonstrate that urinary urgency symptoms may also be reduced by regular physical exercise.

Regarding urine loss during exercise, only one volunteer registered such a complaint. Nygaard et al.35 and Bø13 claim that professional sports is an additional risk for developing UI, especially when high-impact activities are involved. It is believed that the recreational nature of the senior cardiovascular workout, in which the majority (85.7%) participated, may explain the low incidence of urinary incontinence during physical exercise.

Bernardes et al.36 indicate that a pelvic floor with deficient or inadequate muscle function is an important etiological factor in UI. According to Bø and Sherburn37, pelvic floor muscle function is defined as the ability to perform a correct contraction, i.e., tightening around the pelvic opening and moving the pelvic floor internally. As shown in this study, physical activity appears to contribute to better perineal function among elderly women. Bø13 suggests that a reflex contraction of the pelvic floor muscles occurs simultaneously with an increase in abdominal pressure during exercise. Ree, Nygaard and Bø9 affirm that physical exercise can increase the volume of the pelvic floor muscles, making them capable of contracting during increased intra-abdominal pressure.

A study by Stach-Lempinen et al.38 evaluated 82 women with UI using the Oxford scale, which is a subjective measure of perineal contractility. The authors found an association between physical activity level and pelvic muscle contraction, with 43.5% of the more active women reaching a good contraction level, compared to 27% among the less active. In the present study, all variables related to perineal contraction functionality were also higher among active elderly women. Moreover, a classic study by Bø and Finckenhagen39 pointed out that the maximum average power of perineal contraction among healthy women was 19.7±3.2 cm H2O. This value is similar to that found during fast fiber measurement in AG (Md=22.0 cm H2O).

Furthermore, with regard to perineal muscle function, it was observed that the slow fiber-related variables in both the PERFECT scheme (Endurance and Repetitions) and in perineometry had lower medians than fast fiber-related variables in both groups. According to Danforth et al.40, advancing age determines the natural aging of muscle fibers, including hypotrophy or replacement with adipocytes, which can effectively contribute to weakness in the pelvic floor and the UI process.

As noted in this study, the occurrence of UI, even with an intact pelvic floor, is commonly observed in clinical practice. Souza et al.41 recommend caution about exclusively attributing UI etiology to inappropriate urethral support or atrophy of pelvic floor muscles. In this context, Figueiredo et al.42 report that women with the same degree of perineal muscle function may report different UI symptoms. Thus, it is important to consider that there are multiple risk factors associated with the failure of pelvic floor muscles41.

Considering the above-mentioned observations, the high prevalence of urinary incontinence in AG could be seen as a product of age and the higher mean anthropometric variables in this group. According to Delancey43, maximum urethral closure pressure and periurethral fiber quantities decrease with advancing age. Townsend et al.44 and Krause et al.45 have observed that high BMI and waist circumference increase the risk of developing SUI due to increased intra-abdominal pressure and other effects on urethral structures. Thus, centrally distributed adipose tissue can cause a chronic elevation in intra-abdominal pressure and, consequently, in intravesical pressure, which leads to tension in the urethral support structures and increased risk of SUI, even when there is full muscle function of pelvic floor45.

The results indicate that physically active elderly women show better pelvic floor muscle function than their sedentary counterparts. Thus, encouraging physical activity for the elderly population is important since, in addition to its other benefits, it also improves pelvic floor functionality. Physical activity can also collaborate substantially to weight control, which is UI risk factor46. The results also suggest that specific pelvic floor contraction exercises should be incorporated into physical activity routines because they lead to improved automatic contractions in the pelvic floor during times of increased intra-abdominal pressure.

Both the small sample and the difference in group size can be considered study limitations. Nevertheless, this research is of great importance since pelvic floor functionality has been studied at a national level only in young, physically active women and has been neglected in the elderly female population, which is constantly growing.

We suggest that future studies invest in controlling the sample size for more homogeneous groups and involve a blinded evaluator. Greater control of the type of physical activity in which the volunteers participate may also be useful, as well as assessing the time that volunteers have participated (AG) or not participated in these activities (SG). Moreover, other anthropometric measurement methods such as skinfolds and bioelectrical impedance can be included. Other risk factors could also be controlled, since many of them are involved in pelvic floor weakening and UI symptoms in elderly women.

Received: 07/28/2010

Revised: 01/13/2011

Accepted: 03/22/2011

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Appendix 1

  • Correspondence to:

    Janeisa Franck Virtuoso
    Rua Pascoal Simone, 348, Coqueiros
    CEP 88080-350, Florianópolis, SC, Brasil
  • Publication Dates

    • Publication in this collection
      19 Aug 2011
    • Date of issue
      Aug 2011


    • Reviewed
      13 Jan 2011
    • Received
      28 July 2010
    • Accepted
      22 Mar 2011
    Associação Brasileira de Pesquisa e Pós-Graduação em Fisioterapia Rod. Washington Luís, Km 235, Caixa Postal 676, CEP 13565-905 - São Carlos, SP - Brasil, Tel./Fax: 55 16 3351 8755 - São Carlos - SP - Brazil