Twelve-week exercise training and the quality of life in menopausal women – clinical trial

Introduction

Between 40 and 58 years of age women experience menopause; the average age is 51 years [1]. The most frequent symptoms during menopause are hot flushes, night sweats, vaginal dryness, depression, irritability and sleep disorders [2-4]. Women living in a rural area suffer from more severe menopausal symptoms, particularly musculoskeletal, vasomotor and sexual, compared to urban women [5-7]. The menopause transition was associated in a prospective study with decreased health functioning in women who report menopausal symptoms [8, 9]. About 80-96% of women experience mild to severe physical or physiological menopause-related complaints per year when approaching menopause, which is caused by a decline in level of oestrogen [5, 10, 11]. Menopause is also related to reduction of muscle strength, increased cardiovascular diseases, stroke and osteoporosis [12]. Several studies have shown that regular exercise significantly reduced menopausal symptoms and improved well-being [4, 13-16]. Physically active menopausal-aged women experience fewer problems with insomnia, fewer vasomotor symptoms and better mood [4, 17, 18]. Resistance exercise may reduce the decline in muscle strength in middle-aged women [19]. A positive alteration of aerobic and resistance exercises to the blood lipid profile was associated with a reduced risk of coronary heart disease in postmenopausal women, which is widely cited [13]. Although menopause is a normal aging process, the hormonal changes in this period of life may lead to many physical, physiological and social changes deteriorating the quality of life (QoL). Health-related quality of life in middle-life women is usually lower than in middle-aged men, young adults and elderly women [10, 17, 20, 21]. The overall well-being and study of quality of life in mid-aged women has become a major public health concern in the world [5].
Menopausal-aged women usually report a low physical activity level and a sedentary lifestyle which may deteriorate their health and the quality of life. There is evidence that regular physical activity may decrease menopausal symptoms and improve the physical self-worth and QoL in middle-life women. In other words, physical activity may have direct and indirect effects on the quality of life in menopausal-aged women [11, 13, 22]. The impact of a specific exercise on the QoL in middle-aged women has not been directly tested, particularly in women from rural areas, who may experience more severe menopausal symptoms [7]. In most studies PA level was evaluated by questionnaires or a different kind of training was implemented.
The purpose of our study was to investigate the influence of 12-week training on the QoL in menopausal-aged women living in a rural area.

Material and methods

Participants

Participants were recruited by means of advertisements in a local newspaper and posters. The study was conducted in Silesia in Poland between February and March 2014. Subjects were 80 volunteer women aged 40-65 years; the average age was 51 ±3.82. Physically inactive women were randomized to 12 weeks of exercise (n = 40) or usual activity (n = 40). The exercising group (n = 40) was compared to the control group (n = 40). All participants provided written informed consent and they were informed by the researcher that they could withdraw from the study any time. Information about the study was provided to all the subjects by the physiotherapist.
The inclusion criteria were age between 40 and 65, a lack of regular physical exercises, a lack of contraindications to perform physical exercises, and the ability to provide written informed consent.
The exclusion criterion was contraindication to physical activity. Participants were excluded from the study if they had omitted exercise or if the questions were incomplete. The study was approved by the Ethics Committee of the Medical University in Poland.

Study design

There were a total of 80 participants. Subjects were divided into two groups: 40 were randomized to the 12-week exercise group and 40 to the non-exercise group who were asked to maintain their usual level of physical activity. Participants were randomized to either the exercising group or the non-exercising group. Random number generation between 0 and 1 was used. Forty random participants were given the number 0 and 40 the number 1. After randomization exercising women participated in training sessions 3 times a week. Each 60-minute exercise session included warming-up exercises, walking, stretching, strengthening exercises with an elastic band and cooling down exercises. After 12 weeks all participants were asked to fill out a questionnaire.
Anthropometric data such as body mass and body height were measured by the researcher.
Sociodemographic information was obtained regarding age, educational level, and place of living.

Health-related quality of life (SF36)

At the time of enrolment the quality of life was evaluated using the 36-item Short Form Health Survey (SF36), which measures 8 domains of health: physical functioning, physical role limitations, bodily pain, general health, vitality, social functioning, emotional role limitations and mental health. Scoring generates a total score regarding mental health and physical health. Higher scores indicate a better quality of life.

Data analysis

The data were collected and analyzed by the computer software MS Excel and the statistical analyses were performed using Statistica software version 10. Descriptive data were reported as mean and standard deviation (SD) for quantitative variables and percentage for qualitative variables. The differences between the data before and after exercising and between the exercising and control group were tested using the t-test. P values < 0.05 were considered statistically significant.

Results

Eighty women were recruited to the study. After randomization 40 women were allocated to the exercising group and 40 to the non-exercising group. Two women from the exercising-group did not continue the exercise classes duo to loss of interest (5%). They both attended 1 week of training (Fig. 1). After 12 weeks women were asked to again fill out the questionnaire.
The mean age of all participants was 51 ±3.82. The baseline demographic characteristics of the study participants are shown in Table I. Most rural women had primary educational level (46.25%), were overweight (52.50%), were married (88.75%), unemployed (61.25%) and were nonsmokers (58.75%). None of the participants had a history of hormone therapy (HT).
Table II presents the mean scores for each domain in SF36 in both exercising and control groups before 12-week training. The mean scores in the exercising group were 46.09 (vitality – VT) and 67.88 (role limits – physical – RP) and in the control group 46.79 (role limits – emotional – RE) and 66.51 (RP). The differences between groups were small and statistically insignificant. In both groups the average scores in general health (GH), VT and RE were below the average (< 50).
Table III summarizes the mean changes in QoL (SF36) in the exercising and control group after 12 weeks of exercises in all SF36 subgroups. A positive change (non-significant) in all SF36 domains in the exercising group was observed (p > 0.05). In the control group the mean difference was –1.19 for RE (least change) and 0.96 for GH (most change). In the control group the average scores in four domains (PF –0.44, VT –0.71, SF –0.84, RE –1.19) declined. However, only in two domains was the difference between the exercising and control group statistically significant: vitality (p = 0.0046) and mental health (p = 0.0052).

Discussion

The purpose of this study was to investigate the influence of the 12-week training on the QoL in menopausal-aged rural women. According to the SF36 questionnaire the average quality of life is 50. The findings of our study showed that QoL of women in both groups was lower than average in three domains: General Health, Vitality and Role limits – emotional.
The benefits of regular physical activity are routinely cited. Most studies have shown that higher PA level was associated with higher QoL scores, especially for physical aspects [22, 23].
The results of many studies have indicated that habitual physical activity had a favourable influence on menopausal symptoms particularly in the social and psychological domains and thus the quality of life is improved [14-16, 24]. Skrzypulec et al. examined 336 menopausal women in Poland and found that a moderate level of physical activity significantly reduces menopausal complaints, particularly vasomotor symptoms [4]. An observational study indicated that physical activity was associated with better mental health, and less anxiety and stress during menopause [15]. The longitudinal Australian Study on Women’s Health showed that increased PH level was associated with decreased menopausal somatic symptoms [25]. These studies showed the positive influence of physical activity on some menopausal symptoms, which may suggest that the quality of life was also better. However, Moilanen et al. reported in their study that change in global quality of life is more associated with physical activity level than menopausal symptoms [11]. The findings of the present study showed that rural women after 12-week training reported significantly better quality of life in two domains (vitality and mental health) and the mean scores indicated that the level of their QoL was above the average, which is 50.
Another aspect worth mentioning is that general mental health was better in both groups than general physical health in rural women. Different factors must have influenced the quality of mental health in rural areas. Thus, other factors need to be analyzed to find out the reason for the improvement in mental health in the control group. This was in concordance with the findings of Sharma et al. and Martin et al. [5, 26]. Sharma et al. in their study assessed the QoL in urban and rural women and found that in both groups mental health was better than physical health, but women in the rural area had worse QoL [5]. Martin et al. reported that moderate physical activity level mostly improved the mean score of most SF36 [26]. In our study the mean score of each domain of SF36 in rural women was much lower than in other studies [26]. However, after 12-week training exercising women reported improvement not only in physical aspects but also in mental health. Significant differences were observed only in vitality and mental health domains. This indicates that mental health may be improved by many different factors, but physical activity is an important factor influencing both physical and mental health. Martin et al. also observed significantly improved mental and physical health as a quality of life domain in women after exercises [26]. In their study exercising women participated in 3 or 4 training sessions each week for 6 months with training intensity at the heart rate associated with 50% of each woman’s peak VO2. Reed et al. found that inactive women aged 40-62 who attended 12 weeks of yoga classes improved their quality of life and experienced fewer hot flushes, better sleep quality and fewer depression symptoms [27].
Our study showed that it was very important to encourage women to increase their PA level to improve their quality of life. Elavsky et al. observed that physically active women in menopause had improved self-worth and quality of life [13]. Moilanen et al. found that women whose PA level was stable or decreased during menopause had worse QoL [11]. Kim et al. analyzed PA level and QoL in menopausal women and found that increased PA level was associated with fewer total psychosocial symptoms and physical symptoms [28]. Our study showed similar results. The average score of mental health in the exercising group increased by 0.98, social functioning increased by 2.3 and vitality was improved by 4.96. An increased endorphin level due to exercises positively influenced mental health, and the possibility to attend exercises in groups may have a positive impact on social functioning. Consistent with other studies on exercise in midlife women, we found that exercise improved the physical domain of the QoL as compared with usual activity [22, 27, 29, 30].
Interestingly, in our study in the control group the mean scores in four SF36 domains slightly increased and in four domains decreased.
The mean score of other SF36 domains decreased in the control group. Further analysis with other factors would explain QoL changes in group of women without exercises. However, Mishra et al. in their longitudinal study with 2-year follow-up found that QoL measured by SF36 declines, particularly general health and well-being [31]. Ueda assessed the impact of a 12-week educational and exercise programme on the QoL and menopausal symptoms in climacteric women [32]. The QoL of all participants was improved, although statistical significance was not reached.
The results of many studies have shown that women who gained weight during menopause were more likely to report deteriorated quality of life [11, 33, 34]. Dennerstein et al. reported that menopausal women whose body mass index (BMI) increased showed decreased self-reported health [33]. In the Study of Women’s Health Across the Nation (SWAN) the results showed that women with a higher body mass index during menopause reported more vasomotor symptoms and poorer quality of life [35]. This is consistent with the present study. Although the BMI was not considered as a factor influencing the QoL in this study, regular 12-week physical activity might have reduced body mass and could not lead to weight gain in women.
The main strength of our study is the SF36 Health Survey Questionnaire, which has 36 items assessing 8 specific QoL domains. Moreover, the influence of physical activity on QoL was assessed after 12 weeks of exercises performed with the same trainer in the same place, so there was no difference in exercises. Every woman performed the exercises in a controlled environment.
This is one of the few studies to have investigated the association between specific exercises and the quality of life in menopausal women using a validated instrument, the SF36, and a specific 12-week exercise programme. Our study revealed that 12 weeks of exercises was a sufficient period to significantly improve the QoL in menopausal-aged women. There may be many factors influencing the improvement of the general physical and mental quality of life. Endorphin improves well-being and the QoL. After 12-week training women may experience a reduction in body mass, increase in muscle mass and other positive changes in body mass composition, which may be slower during further training. Further studies are required to find out whether 12-week training is sufficient for women to change their life style for a longer time, to assess whether women exercise continuously and to assess the QoL in a 1-2-year follow-up study.

Conclusions

A 12-week period of exercise was significantly correlated with a positive change in vitality and mental health in rural women. Our study indicates that physical activity promotion should be implemented and sedentary women should consider modification of their lifestyle to include physical activity, as it leads to improvement of their quality of life.

Disclosure

This study was funded by MNiSW (grant number: KNW-1-045/N/4/0).
Authors report no conflict of interest.

References

1. Zapantis G, Santoro N. The menopausal transition: characteristics and management. Best Pract Res Clin Endocrinol Metab 2003; 17: 33-52.
2. Nisar N, Sohoo NA. Frequency of menopausal symptoms and their impact on the quality of life of women: a hospital based survey. J Pak Med Assoc 2009; 59: 752-756.
3. Ayers B, Forshaw M, Hunter MS. The impact of attitudes towards the menopause on women’s symptom experience: a systematic review. Maturitas 2010; 65: 28-36.
4. Skrzypulec V, Dabrowska J, Drosdzol A. The influence of physical activity level on climacteric symptoms in menopausal women. Climacteric 2010; 13: 355-361.
5. Sharma S, Mahajan N. Menopausal symptoms and its effect on quality of life in urban versus rural women: A cross-sectional study. J Midlife Health 2015; 6: 16-20.
6. Metintas S, Arýkan I, Kalyoncu C, Ozalp S. Menopause Rating Scale as a screening tool in rural Turkey. Rural Remote Health 2010; 10: 1230-1242.
7. Yohanis M, Tiro E, Irianta T. Women in the rural areas experience more severe menopause symptoms. Indone J Obstet Gynecol 2013; 37: 86-91.
8. Utian WH. Psychosocial and socioeconomic burden of vasomotor symptoms in menopause: a comprehensive review. Health Qual Life Outcomes 2005; 3: 47-58.
9. McVeigh C. Perimenopause: more than hot flushes and night sweats for some Australian women. J Obstet Gynecol Neonatal Nurs 2005; 34: 21-27.
10. Waidyasekera H, Wijewardena K, Lindmark G, Naessen T. Menopausal symptoms and quality of life during the menopausal transition in Sri Lankan women. Menopause 2009; 16: 164-170.
11. Moilanen JM, Aalto AM, Raitanen J, et al. Physical activity and change in quality of life during menopause – an 8-year follow-up study. Health Qual Life Outcomes 2012; 10: 8-17.
12. Dhillon HK, Singh HJ, Shuib R, et al. Prevalence of menopausal symptoms in women in Kelantan, Malaysia. Maturitas 2006; 54: 213-221.
13. Elavsky S. Physical activity, menopause, and quality of life: the role of affect and self-worth across time. Menopause 2009; 16: 265-271.
14. Slaven L, Lee C. Mood and symptom reporting among middle-aged women: the relationship between menopausal status, hormone replacement therapy, and exercise participation. Health Psychol 1997; 16: 203-208.
15. Nelson DB, Sammel MD, Freeman EW, et al. Effect of physical activity on menopausal symptoms among urban women. Med Sci Sports Exerc 2008; 40: 50-58.
16. Dennerstein L, Lehert P, Guthrie JR, Burger HG. Modeling women’s health during the menopausal transition: a longitudinal analysis. Menopause 2007; 14: 53-62.
17. Villaverde-Gutiérrez C, Araújo E, Cruz F, et al. Quality of life of rural menopausal women in response to a customized exercise programme. J Adv Nurs 2006; 54: 11-19.
18. McAndrew LM, Napolitano MA, Albrecht A, et al. When, why and for whom there is a relationship between physical activity and menopause symptoms. Maturitas 2009; 64: 119-125.
19. Dornemann TM, McMurray RG, Renner JB, Anderson JJ. Effects of high-intensity resistance exercise on bone mineral density and muscle strength of 40-50-year-old women. J Sports Med Phys Fitness 1997; 37: 246-251.
20. Javadivala Z, Kousha A, Allahverdipour H, et al. Modeling the relationship between physical activity and quality of life in menopausal-aged women: a cross-sectional study. J Res Health Sci 2013; 13: 168-175.
21. Danby FW. Management of menopause-related symptoms. Ann Intern Med 2005; 143: 845-846.
22. Wendel-Vos GC, Schuit AJ, Tijhuis MA, Kromhout D. Leisure time physical activity and health-related quality of life: cross-sectional and longitudinal associations. Qual Life Res 2004; 13: 667-677.
23. Spirduso WW, Cronin DL. Exercise dose-response effects on quality of life and independent living in older adults. Med Sci Sports Exerc 2001; 33: 598-608.
24. Ivarsson T, Spetz AC, Hammar M. Physical exercise and vasomotor symptoms in postmenopausal women. Maturitas 1998; 29: 139-146.
25. van Poppel MN, Brown WJ. It’s my hormones, doctor’– does physical activity help with menopausal symptoms? Menopause 2008; 15: 78-85.
26. Martin CK, Church TS, Thompson AM, et al. Exercise dose and quality of life: a randomized controlled trial. Arch Intern Med 2009; 169: 269-278.
27. Reed SD, Guthrie KA, Newton KM, et al. Menopausal quality of life: RCT of yoga, exercise, and omega-3 supplements. Am J Obstet Gynecol 2014; 210: 244-211.
28. Kim MJ, Cho J, Ahn Y, et al. Association between physical activity and menopausal symptoms in perimenopausal women. BMC Womens Health 2014; 14: 122-135.
29. Sternfeld B, Quesenberry CP Jr, Husson G. Habitual physical activity and menopausal symptoms: a case-control study. J Womens Health 1998; 1: 115-123.
30. Mirzaiinjmabadi K, Anderson D, Barnes M. The relationship between exercise, body mass index and menopausal symptoms in midlife Australian women. Int J Nurs Pract 2006; 12: 28-34.
31. Mishra GD, Brown WJ, Dobson AJ. Physical and mental health: changes during menopause transition. Qual Life Res 2003; 12: 405-412.
32. Ueda M. A 12-week structured education and exercise program improved climacteric symptoms in middle-aged women. J Physiol Anthropol Appl Human Sci 2014; 23: 143-148.
33. Dennerstein L, Dudley EC, Guthrie JR. Predictors of declining self-rated health during the transition to menopause. J Psychosom Res 2013; 54: 147-153.
34. Sammel MD, Grisso JA, Freeman EW, et al. Weight gain among women in the late reproductive years. Fam Pract 2003; 20: 401-409.
35. Thurston RC, Sowers MR, Chang Y, et al. Adiposity and reporting of vasomotor symptoms among midlife women: the study of women’s health across the nation. Am J Epidemiol 2008; 167: 78-85.