Physical Activity and Pregnancy

Original Editor - Mariam Hashem

Top Contributors - Candace Goh  
One Page Owner - Nicole Hills as part of the One Page Project

Introduction[edit | edit source]

Physical activity is considered safe and beneficial for pregnant women without contraindications to exercise. Pregnancy can be seen as a great time for lifestyle modifications. Moderate intensity exercises are proven to be beneficial for both mother and fetus in most pregnancies with the necessary modifications.[1]

Exercise improves the health and wellbeing of both the mother and infant during pregnancy and in the postpartum period. Pregnancy and the postpartum period are viewed as “teachable moments” where women are motivated to change their habits to improve the health of their babies and themselves. [2] This unique period of time provides an opportunity for health care professionals, specifically physiotherapists, to educate women on the importance of adopting healthy lifestyle interventions, which includes exercise. [2]

Current recommendations[edit | edit source]

In women, physical activity during pregnancy and the postpartum period confers benefits for the following maternal and fetal health outcomes:

Reduced risk of pre-eclampsia, gestational hypertension, gestational diabetes, excessive gestational weight gain, delivery complications and postpartum depression and no increase in risk of stillbirth, newborn complications or adverse effects on birth weight.

The following recommendations are from the WHO 2020 guideline - all pregnant and postpartum women (without contraindications) should:

  • Undertake regular physical activity throughout pregnancy and post partum;
  • Do at least 150 min of moderate-intensity aerobic physical activity throughout the week for substantial health benefits;
  • Incorporate a variety of aerobic and muscle-strengthening activities. Adding gentle stretching may also be beneficial.

In addition:

  • Women who, before pregnancy, habitually engaged in vigorous-intensity aerobic activity or who were physically active can continue these activities during pregnancy and the postpartum period.
  • If pregnant and postpartum women are not currently meeting these recommendations, doing some physical activity will bring health benefits. They should start with small amounts of physical activity and gradually increase frequency, intensity and duration over time. Pelvic floor muscle training (Kegel's exercise) may be performed on a daily basis to reduce the risk of urinary incontinence.
  • Pregnant and postpartum women should limit the amount of time spent being sedentary. Replacing sedentary time with physical activity of any intensity (including light intensity) provides health benefits.[3]

Additional on safety considerations when undertaking physical activity for pregnant women are:

  • Avoid physical activity during excessive heat, especially with high humidity;
  • Stay hydrated by drinking water before, during and after physical activity;
  • Avoid participating in activities which involve physical contact, pose a high risk of falling or might limit oxygenation (such as activities at high altitude, when not normally living at altitude);
  • Avoid activities in supine position after the first trimester of pregnancy;
  • Pregnant women considering athletic competition or exercising significantly above the recommended guidelines should seek supervision from a specialist healthcare provider;
  • Pregnant women should be informed by their healthcare provider of the danger signs for when to stop, or limit physical activity and to consult a qualified healthcare provider immediately if they occur.[3]

Contraindications[edit | edit source]

During pregnancy women who present with absolute contraindications to exercise may continue with their usual daily activities but should avoid moderate and vigorous activities.[4] Women with relative contraindications should discuss their potential participation in these activities with their obstetric care provider prior to beginning or continuing with their exercise programs.[4]

Absolute contraindications[edit | edit source]

  • Ruptured membranes
  • Premature labour
  • Unexplained PV bleeding
  • Placenta praevia after 28 weeks
  • Pre-eclampsia
  • Incompetent cervix
  • Intrauterine growth restriction
  • Higher-order multiple pregnancy (e.g., twins, triplets etc.)
  • Uncontrolled high blood pressure, type 1 or type 2 diabetes or thyroid disease
  • Other serious cardiovascular, respiratory or systemic disorders[4]

Relative contraindications[edit | edit source]

  • Recurrent pregnancy loss
  • Gestational hypertension
  • A history of spontaneous preterm birth
  • Mild/moderate cardiovascular or respiratory disease
  • Symptomatic anaemia
  • Malnutrition
  • Eating disorder
  • Twin pregnancy after the 28th week
  • Other significant medical conditions[4]

Prenatal exercise safety[edit | edit source]

Physiotherapists should educate pregnant women on specific safety precautions during exercise, activities to avoid, and when to consult their healthcare provider.[4]

Safety precautions (see above)

Adverse reactions to exercise

Women should be advised to stop exercising and consult their healthcare provider immediately if any of the following occur:

  • persistent excessive shortness of breath that does not resolve with rest
  • severe chest pain
  • regular and painful uterine contractions
  • vaginal bleeding
  • persistent loss of fluid from the vagina indicating the rupture of the membranes
  • persistent dizziness or faintness that does not resolve on rest[4]
  • decreased fetal movement
  • muscle weakness affecting balance
  • calf pain or swelling[5]

Benefits of physical activity during pregnancy[edit | edit source]

Exercise and weight management[edit | edit source]


Weight gain during pregnancy is known as gestational weight gain (GWG). Women who begin pregnancy:

  • underweight should be expected to gain 12.5-18kg over the course of their pregnancy
  • normal weight should gain between 11.5-16kg
  • overweight should gain 7-11.5 kg and
  • obese should gain between 5-9 kg[6].

A high percentage of women exceed the recommended weight.[7] Excessive GWG is associated with a high risk of developing gestational diabetes mellitus (GDM), hypertension[8], having a cesarean delivery and postpartum weight retention.[9] Regular physical activity during pregnancy can reduce GWG by an average of 6.8 pounds compared to women who do not exercise regularly.[10] A recent randomized control trial (RCT) suggests behavioural-lifestyle intervention supported by a smartphone app among pregnant women improved dietary, physical activity, and motivation outcomes[11].

[12][13]

Exercise and cardiac and respiratory fitness[edit | edit source]

Pregnancy is accompanied by many cardiac and respiratory changes that begin during the fifth week of gestation and last until about a year after delivery[14], Cardiac output and blood volume increase up to 50%.[15] [16] Tidal volume and oxygen consumption (VO2) also increases to supply the oxygen requirements of the fetus.
   

[17]

Exercise and psychological well-being[edit | edit source]

Pregnancy can also be a time of major emotional changes. Many women suffer alterations in mood and even prenatal depression. Recent studies have estimated the prevalence of depression during pregnancy to be between 10% and 20%[18][19].

Women who keep fit during pregnancy are more relaxed and cope better with the emotional and physiological strains of pregnancy. This is attributed to a number of positive effects from exercise such as weight management, better body image and self-esteem, improved sleep, and increased energy levels.

Exercise is also proven to be effective in treating antenatal depression[20].

[21]

Low back pain[edit | edit source]

Pregnant women may develop an increase in lumbar lordosis, which has been shown to contribute to the prevalence (50%) of low back pain in pregnant women.[5] A general whole-body exercise program and lumbar stabilisation exercises can help to reduce the intensity of back pain.[22][23]

[24]

Labour outcomes[edit | edit source]

Pregnant women who maintain a regular exercise routine may experience less pain and shorter labour.[25] This is attributed to the exercise effect on inducing metabolic and hormonal changes that may impact uterine contractility and endurance.[26] Exercise during pregnancy has also been associated with reduced risk for Cesarean birth.[27]

Urinary incontinence  [edit | edit source]

Pelvic floor strengthening exercises during pregnancy are helpful in prevention and reducing the symptoms of urinary incontinence.[28]

Diastasis recti abdominis[edit | edit source]

There is no evidence to support the need to treat or prevent diastasis recti abdominis during pregnancy.[29]

Exercise recommendations[edit | edit source]

Swimming in pregnancy.jpeg

American College of Obstetricians and Gynecologists recommends reviewing the overall health, obstetric, and medical risks before prescribing an exercise program to a woman who is pregnant. In the absence of contraindications, a pregnant woman should be encouraged to engage in regular, moderate-intensity physical activity.[5]

Pregnant women are encouraged to spend 30 minutes or more of moderate-intensity physical activity on most, and preferably all days of the week. Moderate-intensity physical activity is defined as an activity with an energy requirement of 3-5 metabolic equivalents (METS). For most healthy adults, this is equivalent to brisk walking at 2-5 mph or a self-reported rating of 12-13 (somewhat hard) on the Borg scale of perceived exertion. After the 13th week of pregnancy, about (300 kcal) per day are required to meet the metabolic needs of pregnancy. this energy requirement is increased further when daily energy expenditure is increased through exercise, especially with weight-bearing exercises, such as walking. Proper hydration and subjective feelings of heat stress are very important. The supine position should be avoided as much as possible during rest and exercise after the first trimester, as it can obstruct venous return. Motionless (static) standing should be avoided as it is associated with a significant decrease in cardiac output.[5]

FITT Recommendations for Pregnancy

  • Frequency: 3 or more days a week for aerobic activities and 2-3 non-consecutive days per week for resistance activities.
  • Intensity: moderate-intensity (12-13 on the 6-20 Borg scale) for aerobic activities, resistance activities should be performed to the point of moderate fatigue (8-10 reps or 12-15 reps). Begin with low weights with multiple repetitions.
  • Time: 30 minutes of moderate-intensity aerobic activities, 2-3 sets of resistance exercises focusing on major muscle groups. (beginners should start with 1 set and progress as able)
  • Type: Exercises that use large muscle groups in a continuous rhythmic manner are beneficial and have not been associated with adverse effects eg aerobic exercises, walking, hiking, jogging/running, aerobic dance, swimming, cycling, rowing, cross country skiing, skating, dancing and rope skipping (extra caution should be taken with activities that increase the risk of falls).[30]

Physical activities effects on the fetus and the newborn[edit | edit source]

Exercise is not associated with birth weight reduction[31] and has been found to reduce the risk of preterm birth.[1]. Exercise can boost the neuro-behavioral profile and orientation level of the newborn; they are more alert and interested in their surroundings, and less demanding on their mothers. Also, babies of physically active pregnant women are lighter and leaner than offspring from nonphysically active pregnant women.[1]

A study that compared placental growth and morphometric measurements found faster placental growth rate, and greater scores on the morphometric indexes of placental function with exercising pregnant women.[32]

[33]

Resources[edit | edit source]

[34]

2019 Canadian guideline for physical activity during pregnancy[4]

American College of Obstetricians and Gynecologists committee opinion on physical activity and exercise during pregnancy and postpartum[35]

Exercise and pregnancy in recreational and elite athletes a 5 part series by Bø and colleagues (2016):

Summary of the international guidelines for physical activity after pregnancy[40]

The Motivate2Move website, created by Wales Deanery, has a useful page on Exercise During Pregnancy.

References[edit | edit source]

  1. 1.0 1.1 1.2 Katch V. Pregnancy And Physical Activity( 2017, February, 5). Retrieved from http://michigantoday.umich.edu/pregnancy-and-physical-activity/.
  2. 2.0 2.1 Smith GN, Pudwell J, Roddy M. The Maternal Health Clinic: a new window of opportunity for early heart disease risk screening and intervention for women with pregnancy complications. Journal of obstetrics and gynaecology Canada. 2013 Sep;35(9):831.
  3. 3.0 3.1 Bull FC, Al-Ansari SS, Biddle S, Borodulin K, Buman MP, Cardon G, Carty C, Chaput JP, Chastin S, Chou R, Dempsey PC. World Health Organization 2020 guidelines on physical activity and sedentary behaviour. British Journal of Sports Medicine. 2020 Dec 1;54(24):1451-62.Available from:https://bjsm.bmj.com/content/54/24/1451 (accessed 2.12.2020)
  4. 4.0 4.1 4.2 4.3 4.4 4.5 4.6 Mottola MF, Davenport MH, Ruchat SM, Davies GA, Poitras VJ, Gray CE, Garcia AJ, Barrowman N, Adamo KB, Duggan M, Barakat R. 2019 Canadian guideline for physical activity throughout pregnancy. Br J Sports Med. 2018 Nov 1;52(21):1339-46.
  5. 5.0 5.1 5.2 5.3 Artal R, O'toole M. Guidelines of the American College of Obstetricians and Gynecologists for exercise during pregnancy and the postpartum period. British journal of sports medicine. 2003 Feb 1;37(1):6-12.
  6. Barakat R, Perales M, Garatachea N, Ruiz JR, Lucia A. Exercise during pregnancy. A narrative review asking: what do we know?. Br J Sports Med. 2015 Jul 1:bjsports-2015.
  7. Davenport MH, Steinback CD, Mottola MF. Impact of pregnancy and obesity on cardiorespiratory responses during weight-bearing exercise. Respiratory physiology & neurobiology. 2009 Jul 31;167(3):341-7.
  8. Gaillard R, Durmuş B, Hofman A, Mackenbach JP, Steegers EA, Jaddoe VW. Risk factors and outcomes of maternal obesity and excessive weight gain during pregnancy. Obesity. 2013 May;21(5):1046-55.
  9. Hedderson MM, Gunderson EP, Ferrara A. Gestational weight gain and risk of gestational diabetes mellitus. Obstetrics and gynecology. 2010 Mar;115(3):597.
  10. Evenson KR, Savitz A, Huston SL. Leisure‐time physical activity among pregnant women in the US. Paediatric and perinatal epidemiology. 2004 Nov;18(6):400-7.
  11. Ainscough KM, O'Brien EC, Lindsay KL, Kennelly MA, O'Sullivan EJ, O'Brien OA, McCarthy M, De Vito G, McAuliffe FM. Nutrition, Behavior Change and Physical Activity Outcomes From the PEARS RCT—An mHealth-Supported, Lifestyle Intervention Among Pregnant Women With Overweight and Obesity. Frontiers in endocrinology. 2020 Feb 4;10:938.
  12. Program for Pregnancy and Postpartum Health.Diabetes during Pregnancy: how exercise can help! Published on Oct 15, 2018. https://www.youtube.com/watch?v=YETqZcB36pM
  13. Program for Pregnancy and Postpartum Health.Pregnancy and Hypertension: how exercise can help! on Oct 15, 2018. https://www.youtube.com/watch?v=cKOzIirZqAU
  14. James Ford Clapp III MD, Capeless E. Cardiovascular function before, during, and after the first and subsequent pregnancies. The American journal of cardiology. 1997 Dec 1;80(11):1469-73.
  15. Geva T, Mauer MB, Strikera L, Kirshon B, Pivarnik JM. Effects of physiologic load of pregnancy on left ventricular contractility and remodeling. American heart journal. 1997 Jan 1;133(1):53-9.
  16. Gilson GJ, Samaan S, Crawford MH, et al. Changes in hemodynamics, ventricular remodeling, and ventricular contractility during normal pregnancy: a longitudinal study. Obstet Gynecol 1997;89:957–62.
  17. Program for Pregnancy and Postpartum Health.Pregnancy and the Cardiovascular System Published on Oct 15, 2018. https://www.youtube.com/watch?v=RtQyy_K76QY
  18. Bennett HA, Einarson A, Taddio A, Koren G, Einarson TR. Prevalence of depression during pregnancy: systematic review. Obstetrics & Gynecology. 2004 Apr 1;103(4):698-709.
  19. Pearson RM, Carnegie RE, Cree C, et al. Prevalence of Prenatal Depression Symptoms Among 2 Generations of Pregnant MothersThe Avon Longitudinal Study of Parents and Children. JAMA Netw Open.2018;1(3)
  20. El-Rafie, M. M., Khafagy, G. M., & Gamal, M. G. (2016). Effect of aerobic exercise during pregnancy on antenatal depression. International journal of women's health8, 53-7. doi:10.2147/IJWH.S94112
  21. Program for Pregnancy and Postpartum Health. Pregnancy and Depression: how exercise can help! Published on Oct 15, 2018. https://www.youtube.com/watch?v=WsBQ2cuXU2Y
  22. Garshasbi A, Faghih Zadeh S. The effect of exercise on the intensity of low back pain in pregnant women. International Journal of Gynecology & Obstetrics. 2005 Mar 1;88(3):271-5.
  23. Elden H, Ladfors L, Olsen MF, Ostgaard HC, Hagberg H. Effects of acupuncture and stabilising exercises as adjunct to standard treatment in pregnant women with pelvic girdle pain: randomised single blind controlled trial. Bmj. 2005 Mar 31;330(7494):761.
  24. Program for Pregnancy and Postpartum Health. Pregnancy and Back Pain: how exercise can help! Published on Oct 15, 2018. https://www.youtube.com/watch?v=_DkzGWTZXBU
  25. Clapp III JF. The course of labor after endurance exercise during pregnancy. American journal of obstetrics and gynecology. 1990 Dec 1;163(6):1799-805.
  26. Salvesen KÅ, Stafne SN, Eggebø TM, Mørkved S. Does regular exercise in pregnancy influence duration of labor? A secondary analysis of a randomized controlled trial. Acta obstetricia et gynecologica Scandinavica. 2014 Jan 1;93(1):73-9.
  27. Tinloy J, Chuang CH, Zhu J, Pauli J, Kraschnewski JL, Kjerulff KH. Exercise during pregnancy and risk of late preterm birth, cesarean delivery, and hospitalizations. Women's Health Issues. 2014 Jan 1;24(1):e99-104.
  28. Mørkved S, Bø K. Effect of pelvic floor muscle training during pregnancy and after childbirth on prevention and treatment of urinary incontinence: a systematic review. Br J Sports Med. 2014 Feb 1;48(4):299-310.
  29. 29.0 29.1 Bø K, Artal R, Barakat R, Brown WJ, Davies GA, Dooley M, Evenson KR, Haakstad LA, Kayser B, Kinnunen TI, Larsen K. Exercise and pregnancy in recreational and elite athletes: 2016/2017 evidence summary from the IOC expert group meeting, Lausanne. Part 5. Recommendations for health professionals and active women. British journal of sports medicine. 2018 Sep 1;52(17):1080-5.
  30. American College of Sports Medicine. ACSM's guidelines for exercise testing and prescription 10th edition. Lippincott Williams & Wilkins; 2018.
  31. Nascimento SL, Surita FG, Cecatti JG. Physical exercise during pregnancy: a systematic review. Current Opinion in Obstetrics and Gynecology. 2012 Dec 1;24(6):387-94.
  32. Clapp III JF, Kim H, Burciu B, Lopez B. Beginning regular exercise in early pregnancy: effect on fetoplacental growth. American journal of obstetrics and gynecology. 2000 Dec 1;183(6):1484-8.
  33. Program for Pregnancy and Postpartum Health. Pregnancy and Exercise: the effect on your baby! Published on Oct 15, 2018. https://www.youtube.com/watch?v=iODWEAISuN4
  34. Program for Pregnancy and Postpartum Health. Baby steps for better health during pregnancy. Published on Oct 26, 2018. https://www.youtube.com/watch?v=_DkzGWTZXBU
  35. American College of Obstetricians and Gynecologists. Physical activity and exercise during pregnancy and the postpartum period. Committee Opinion No. 650. Obstet Gynecol. 2015;126(6):e135-142.
  36. Bø K, Artal R, Barakat R, Brown W, Davies GA, Dooley M, Evenson KR, Haakstad LA, Henriksson-Larsen K, Kayser B, Kinnunen TI. Exercise and pregnancy in recreational and elite athletes: 2016 evidence summary from the IOC expert group meeting, Lausanne. Part 1—exercise in women planning pregnancy and those who are pregnant. British Journal of Sports Medicine. 2016 May 1;50(10):571-89.
  37. Bø K, Artal R, Barakat R, Brown W, Dooley M, Evenson KR, Haakstad LA, Larsen K, Kayser B, Kinnunen TI, Mottola MF. Exercise and pregnancy in recreational and elite athletes: 2016 evidence summary from the IOC expert group meeting, Lausanne. Part 2—the effect of exercise on the fetus, labour and birth. British journal of sports medicine. 2016 Nov 1;50(21):1297-305.
  38. Bø K, Artal R, Barakat R, Brown WJ, Davies GA, Dooley M, Evenson KR, Haakstad LA, Kayser B, Kinnunen TI, Larsén K. Exercise and pregnancy in recreational and elite athletes: 2016/17 evidence summary from the IOC Expert Group Meeting, Lausanne. Part 3—exercise in the postpartum period. British journal of sports medicine. 2017 Nov 1;51(21):1516-25.
  39. Bø K, Artal R, Barakat R, Brown WJ, Davies GA, Dooley M, Evenson KR, Haakstad LA, Kayser B, Kinnunen TI, Larsén K. Exercise and pregnancy in recreational and elite athletes: 2016/17 evidence summary from the IOC expert group meeting, Lausanne. Part 4—Recommendations for future research. British journal of sports medicine. 2017 Dec 1;51(24):1724-6.
  40. Evenson KR, Mottola MF, Owe KM, Rousham EK, Brown WJ. Summary of international guidelines for physical activity following pregnancy. Obstetrical & gynecological survey. 2014 Jul;69(7):407.