The Benefits od Resistance Training While Pregnant
I have trained close to 200 pregnant women over the last 17 years. I believed so strongly in the potential for women to optimize their health and wellness during pregnancy that I left a promising job training athletes to open the first fitness studio in Montreal to specialize in prenatal and postnatal fitness. This was back in 2008 when there was little to no research on safety or program design. It was an uphill battle against the norms of rest or low exertion but things have come a long way in the last two decades.
Data almost always counts more than ‘anecdata’ and so I will start with a bit of a study review before I talk about my personal experience. Data is a tricky thing to turn into real life training protocols so I do want to include both the science along with my observations. So first let’s look at what the nerds say…
* you can scroll down to the conclusion to get the gist of things but the “ my observations from the studio” section is worth the 2 minute read.
In a 2024 research review looking at the benefits and safety of weight training with pregnant women, the authors concluded that resistance training is “safe, beneficial and effective form of exercise for pregnant women to increase fitness and improve pregnancy outcomes…” Noting that the addition of aerobic exercise could enhance the benefit as well…
Resistance training, alone or together with aerobic exercise, can improve maternal symptoms of pregnancy, mediate the effects of gestational diabetes and obesity on maternal and fetal health, and improve labor and delivery outcomes for both mother and fetus. Resistance training during pregnancy can also improve fetal development and infant health from childhood well into adulthood.
We need more research to have strong quantitative conclusions on these benefits but as you will see the vast majority of research points towards advantages to both mother and baby.
A small control trial from 2017 looking at the effects of regular exercise on cholesterol and triglyceride levels during pregnancy found some interesting results. 50 Latina women were split into two groups, one that did three 60 minute workouts each week which comprised of both cardiovascular and resistance training. The other group maintained their regular activity level. What they found:
- significantly lower levels of LDL and triglycerides in the active group.
- less delivery issues (moderate postpartum hemorrhage) in the active group
- fewer complications in newborns in the active group – less issues with blood oxygen levels (cyanosis) and less respiratory distress.
Obviously we need a larger trial with a more expansive demographic to make any strong conclusions but the results do match other small control trials and epidemiological data.
While I am focusing on strength training here there is some interesting research looking at aerobic fitness level and labor duration. This observational study used maximum oxygen uptake levels to measure aerobic capacity in women who had spontaneous deliveries. They saw that higher aerobic fitness was correlated with shorter labor times. Though there are a number of factors that could impede the benefits of aerobic fitness on labor duration this is definitely something many of my clients would want to know about. No one wants a longer than necessary delivery and so I try and include one to two endurance workouts each week (depending on how often the person is training). These are focused on maintaining or improving aerobic capacity as blood volume increases. Not V02 max training, just simple aerobic/endurance workouts.
A 2006 literature review on exercise in the prevention of maternal-fetal disease also had promising findings –
- women who were the most active have the lowest incidence of gestational diabetes.
- prevention of gestational diabetes lowers the probability of type 2 diabetes in both mother and child.
- women who exercise have a lower incidence of pre-eclampsia.
- 4 mechanisms have been observed that may explain the above benefit: 1 – exercise in early pregnancy enhances placental growth and blood flow, 2 – exercise reduces oxidative stress, 3 – exercise reduces inflammation, 4 – exercise appears to correct disease related endothelial
- Exercise may combat reproductive issues due to obesity
Obesity and pregnancy
Women who are obese prior to pregnancy have increased risk of polycystic ovarian syndrome (PCOS), menstrual irregularity and infertility. Obesity may also be responsible for the increased risk of spontaneous abortion rates in women with PCOS. It is also found that fertility treatments are less effective for women who are significantly overweight,
During pregnancy women who are overweight or obese have an increasing (as weight goes up) risk of pre-eclampsia and gestational diabetes. overweight women tend to give birth to larger babies even when pre-eclampsia and gestational diabetes are not a factor. There is an increased risk of neonatal intensive care, caesarian section and instrument delivery.
Interestingly, a 2009 study suggests that resistance training while pregnant, even for moms-to-be who were overweight or obese during pregnancy reduced the incidence of high birth weights of the baby. The mothers weight did not have to change significantly for the effects of resistance training to benefit the baby.
Another study showed that resistance training performed 3-5 times per week showed correlations with increased fetal length and more lean body mass than the control group. In some research looking to see if there were any long term benefits for children who’s mothers engaged in vigorous exercise during pregnancy they found that these children had heightened attentiveness and discipline and were cognitively more advanced by age 5 than the control group. They concluded that increased blood volume, cardiac output, placental functioning and nutrient delivery were likely behind the benefits
As mentioned above this is new research, predominantly small studies but the results are significant and the mechanisms seem to line up with the results so we will have to keep our eyes on the field and see if repeated studies have similar findings.
Easier Labour
Exercise has been shown to reduce the incidence of a number of complications during labour, with resistance training having a significant benefit. Several studies (1, 2, 3, 4, 5, 6) have described decreased labour times, shorter hospitalization, and a reduced incidence of C-section, abdominal and vaginal operative deliveries.
In the last 17 years of training pregnant women I can vouch that it appears that the women who have trained consistently and vigorously during their pregnancy seem to have easier deliveries and postnatal recovery times in general. This isn’t some kind of guarantee , there are many factors at play. One of them seems to be duration of training. The clients of mine who have been with me prior to pregnancy seem to be easier off during labour. But again not every time. Age plays a role, the position of the baby plays a role, umbilical issues play a role, etc.
My observation from our studio
And now lets see what this nerd says…
The majority of studies looking at preventing or managing prenatal weight have used a mix of diet and aerobic exercise. But we know that exercise only has a minimal effect on weight management. The things that move the needle the most is calorie restriction and non exercise related activity. Exercise absolutely counts for energy expenditure but I think what we will see as the research continues is that a mix of both aerobic and resistance training is necessary or optimal while everyday activities outside of the workouts count much more.
quick side note –
A well designed strength program can assisst those who may have trouble moving around throughout the day. Asking someone to just be more active who has not been so for some time or struggles with joint pain or stability needs specific help to get there.
Weight management is only one aspect of the health benefits during pregnancy. If Aerobic and resistance training are going to both lead to minimal weight shifts we then need to determine what other benefits arise from both. That said, my clients who optimize their diet during pregnancy have not only had enjoyable pregnancies but they have improved their own health markers and weight profile. I want to emphasize that losing weight during pregnancy by managing calories is a serious endeavour. You need to make sure you are eating enough. This is easily accomplished with tracking but you need to be consistent. This isn’t the time to mess around with a low calorie diet all willy nilly. I do not recommend this. Just remember that adding moderate to vigorous exercise to your life will extend benefits to you and the baby regardless of weight loss.
A better approach would be to try and manage weight as soon as you start trying to get pregnant or even better – about a year before you think you might want to start. Not everyone knows that far ahead of time but if you do, it’s something to consider.
As mentioned above, there are studies that correlate decreased labor times and developmental advantages with aerobic fitness so we should make sure this is part of an exercise regimen. I don’t think anyone, pregnant or not, male or female, should choose aerobic over resistance training or vice versa. Both are equally important for health and longevity. But from my experience the benefits that strength and stability training have for overall pregnancy satisfaction, prevention of pelvic floor and back pain which leads to better sleep and ability to recover postpartum is what makes it a priority for my clients. If time is a factor I would prioritize resistance training or if there is a personal preference towards strength training I am happy to indulge and focus on the many benefits it has. If someone prefers aerobic fitness then that also works. Always make the most time for the thing that will keep the person happy and engaged…and then just slip in some weighted lunges…oops!
Hip mobility and shoulder/postural strength and stability are two major factors you won’t find in the research. The posture changes quickly as the belly expands outwards and this can have delterious effects both during pregnancy and afterwards while feeding. Mitigating these issues is a major focus in our studio and specific resistance training is what we use to do so.
There are a number of other things we tend to address depending on the individual, all of which are not included as specific benefits cited through research but can fall under the improved mood and sleep categories. This is because the increased strength and fitness lowers discomfort and upregulates hormones that allow for better moods and sleep!
The studies do a great job in defining safety and measuring the short term benefits of blood markers and disease reduction during pregnancy and delivery. But they miss out on what women need right after delivery, which is a strong, agile and stable body. They also often need postnatal abdominal recovery. Though the science is out on whether you can prevent diastasis recti (the thinning of the abdominal wall) through exercise, this is something that I have witnessed in the studio. I am the first to admit that this is anecdotal and not science.
We don’t focus solely on abdominal strengthening, we also work on diaphragmatic breathing to make a mind body connection during relaxation phase. Doing these types of exercises during a workout is great but we have a system that we try and employ with our clients that helps them engage with activation and relaxation throughout the day. Again, this is not hard science. I have simply been trying to address an issue with some ideas that make sense on a biological level. We are trying to plug the gaps in awareness that may lead to a weakening or an overuse issue.
There is a case that academics occasionally miss the mark when compared to professional trainers. It’s true that lab settings are not the same as real life and we need to take this into consideration when employing results found in studies. It is also true that not all trainers are created equal but good ones that actually train people in person (not instagram online trainers) usually have long records of trial and error and have found what works. They also pay close attention to the research and recognize what is useful vs what is a tiny “significant” result in a study that makes no difference in the real world.
A well rounded exercise program will increase mobility, stability, endurance and strength – all of which carry over nicely into life as a new parent. Aerobic exercise has clear benefits and it should very much be part of the regimen. I think it is important to note that the people who come to me that prioritize running or cycling tend to have the worst overall physical assessments (other than cardiovascular ability). This is not universal but it is common. So if this sounds like you, I implore you to try and include more resistance training. Pregnancy is a great time to try and get good general fitness, it will make the time even more enjoyable and the benefits will be very clear when you are trying to soothe a baby for hours or reaching down low to pick up a floppy infant and yet again when you’re wrangling a toddler.
Conslusions
The research may still be growing but there are some real takeaways that are important for the public, for doctors and for trainers –
- aerobic and strength exercise is not just safe but should be encouraged.
- both can can help lower maternal cholesterol levels during pregnancy.
- both have been seen in multiple studies to reduce labor duration.
- both can reduce the incidence of gestational diabetes and pre-ecamplsia and the reduction of gestational diabetes carries over to lower risk in type 2 diabetes for both the mother and infant as they age.
- strength training has been linked to better physical and cognitive development for the fetus that continue after birth up until the age of 5 (latest it has been followed up so far).
- some studies suggest that women who strength train have lower risks of C-sections and other delivery complications.
- mothers who exercise during pregnancy have babies born with less blood oxygen and respiratory issues.
There are very specific situations where exercise may be discouraged for pregnant women. Your doctors will let you know when you need to slow down or stop. But outside of extenuating circumstances the biggest takeaway here is that vigorous exercise is completely safe.
There are some small studies that suggest certain powerlifting movements are also safe. I still err on the side of caution when it comes to power training. While the exercises may be deemed safe for the ultra trained individual, I think introducing these movements shortly before or during pregnancy can be problematic. These exercises take a lot of coordination and body awareness. During pregnancy the body is changing at a more rapid rate than at any part of your life and subtle differences in center of gravity, joint mobility and breathing disturbances can affect peoples ability to perform explosive movements with precision. So this is out for me and honestly I think it is an unnecessary risk even for well trained powerlifters. It’s not so much about a risk to the baby or the pregnancy in general but more as a risk of injury to the mom. An injury can sideline you from all activity for the remainder of the pregnancy and then make being a new mom so much harder than it needs to be. You can take a 10-12 month break, its going to be fine.
If you or anyone you know needs some help designing a well rounded program that will optimize for many of the benefits listed above please fee free to contact me for help. We do online consultations as well as our in person training for those who live in the Montreal area.
Are Collagen Supplements Worth Your Money?
I’ll get to the current science but first I feel like its necessary to point out the complexity of a free market that involves both scientific research and product development with regards to health.
I think we need to be weary of broadly criticizing studies simply based on who funds them. I stand by this statement despite examples of data fudging because we actually need industry funding, it is the ideal way things work as long as it is done well.
If you want to release a product, you should be responsible or at least partially responsible for proving that it works in the ways you advertise it. At the very least you should prove that it is harmless but I believe we should be aiming higher. We should also want third party, neutral institutions to research compounds and compound blends that exist in the market. It is important to have multiple sources of gatekeeping when it comes to health information and product development, be they medications or supplements. Testing is very expensive which is why its preferable that industry pays for it but neutrality is also important which is why government led programs have historically been responsible for it. As of late the general public has had diminishing trust in these organizations. People want neutral testing but they often poopoo the institutions that do it best. So what do we do about it?
A good ground rule for trusting results is to defer to the conclusions of multiple specialists or multiple institutions Are studies being repeated in different countries by different organizations? If yes, then we are approximating truth as best we can. The chances of negligence or corruption across the globe is virtually zero. The practice of empirical research has its own guard rails that will often catch the wrong doers, though it does take time.
We have this exact scenario for collagen supplements and despit emy first statement the results point toward industry funded studies being biased. The only studies that suggest a benefit for skin health are ones performed by companies that sell the product while independent institutional studies show no benefit. This brand new meta analysis looking at the effects of collagen on skin aging reviewed 23 randomized control trials. They found that collagen supplements improved skin hydration, elasticity and wrinkles. But in a subgroup review looking at funding sources, they found that the control trials with funding from pharmaceutical companies showed significant benefits while the ones who had independent funding did not. When separating high quality studies from lower quality studies they found similar results, with the lower quality studies being the ones that showed significant benefit.
Occasionally, outlier studies that show a large benefit can skew the over all results of a meta analysis or study review. Sometimes it is because of a larger study group or a stronger effect result. But if these outlier studies are of poorer quality then they will skew the average result in a way that creates the wrong “consensus”. This is why a sensitivity analysis as they did in the above review can be helpful in pointing out the more general picture.
As far as collagen having potential benefits for connective tissue synthesis, some of the best labs in the world have found little to no evidence for this.
In 2022 a narrative review outlined a clear benefit of protein supplementation on muscle synthesis yet no data has shown a link between dietary protein intake and connective tissue building. Up until this point, most studies looked at ingestion of essential amino acids through whey or dairy based supplementation. It was theorized that collagen supplements might stimulate connective tissue synthesis because of its high content of certain amino acids or through some sort of stimulatory mechanism of specific peptides.
But then in 2023 this study from Luc Van Loon et.al. showed that neither whey protein nor collagen supplements increased muscle connective tissue synthesis post exercise.
It’s fair to say that we need more studies to fully disprove any positive action on connective tissue from collagen supplementation. A couple other studies do exist showing a small potential benefit from doses of 15g/day. But there may be a funding bias and considering that the Van Loon study used 30g doses as compared to an equal dose of whey protein and a placebo group I am not convinced that we will see positive results when the study is well designed
My take on this is that so far it looks like it is a waste of money. I’m agnostic in that I am willing to change my mind but I don’t understand the mechanism by which consuming collagen would help build it. If you currently take a collagen supplement and feel like it is helping you then go for it. I would reassess that the brand you use is third party tested for safety but once that is determined these supplements seem to be harmless even at high doses.
Though the harm that might exist is that the placebo effect of a supplement or a procedure like acupuncture might get in the way of finding something that actually will help you in the long term. Placebo is not always a benign tool for relief.
Be kind to each other,
Joey
Sourdough Sardine Toast
This is a classic recipe used in my nutrition plans. If you want to become obsessed with sardines this is how you start!
Toast is a great way to double the protein intake in what would normally be a mediocre meal as a closed sandwich. Sardine toast is also new for many people and it is a hard sell at first but trust me, it is so good and if need be you can replace the sardines with other protein choices. Though not included here I have great options in my nutrition plans with marinated tofu, pulled chicken, chickpea mash and a spicy deer steak slices, all of which can be prepared beforehand and used over the course of about 4-5 days.
The Truth About Seed Oils
Nutrition science is difficult, the food matrix and the digestive and metabolic processes that engage with it are incredibly complex. Trust in science makes things even more complicated when money and politics can interfere and incentives can be questioned. Yet in the hopes of saving lives hundreds of thousands of researchers around the world dedicate their entire careers to understanding dietary mechanisms and the net effect they have on human health.
When you simultaneously demand proof while dismissing overwhelming evidence you are not a skeptic you are a denialist.
Is Organic Food Healthier and Safer?
According to a clinical report by the Committee of Nutrition, Council on Environmental Health and Academy of American Pediatrics –
current evidence does not support any meaningful nutritional benefits or deficits from eating organic compared with conventionally grown foods, and there are no well-powered human studies that directly demonstrate health benefits or disease protection as a result of consuming an organic diet.”
Myth-Busting Raw Milk
A frenzy of talk around food safety is currently buzzing around media outlets and across social media platforms. More awareness about the safety and nutrition of food should bolster our individual and communal health., right? Unfortunately many sources of information on food safety (wellness gurus, politicians and doctors with little to no nutrition, chemistry or policy background) seem to have agendas closer to deregulation and institutional distrust than they do on education and policy changes that make a difference. The guise often includes conspiracy to keep people sick for profit. Given the reality of free market, shareholder interest based capitalism, this is not hard to imagine. But imagining something does not make it real and deregulating our network of safeguards is a giant leap backwards in food safety. Increasing fear around food is particularly harmful to those who might struggle with health issues or those who are on a tight budget. Many of our Institutions have put in place processing practices to try and protect as many people as possible from food borne illnesses while increasing food availability. No one is saying that they are perfect or immune from corruption but these practices are still our best option in a globalized food market. An important example of such regulatory processes are the laws around pasteurization of milk and dairy products.
Longevity Centred Fitness Classes
We have been providing science based programs for Montrealers for over 16 years. We have helped athletes improve performance, women optimize health during pregnancy, people overcome injury and thrive with physical disabilities and have helped hundreds of others go through their health and fitness goals.
Is Aspartame Carcinogenic? No
We tend to lean into all or nothing statements, they appeal to our sense of simplicity ; “Good things always happen to me”, “I am never lucky”, “drugs are bad”. But the word drugs for example includes, marijuana, methamphetamine, metformin, Tylenol and psilocybin, Each compound being completely different and having wildly different affects on our bodies. In this small list alone we have the potential to relieve pain, alter consciousness, save a life or take one . Is there any real meaning in the statement “drugs are bad”?
Don’t believe the hype – How much muscle do you need for longevity.
You may have noticed the pendulum swinging with the new craze of huge protein consumption rates and big push to gain muscle mass. I came across one woman’s channel trying to convince every woman to bulk up – to go hard against the fear of it. Indeed I have had many women approach me over the past 2 decades for training and say that they don’t want to bulk up. And then you have loads of trainers, including myself that have for years tried to explain how hard it is to truly get bulky. But being aware that it’s difficult doesn’t mean you should or shouldn’t do it. It is not, though it would appear many would disagree with me, all good to get huge. There are consequences, amenorrhea being just one of them. But to get attention now, you have to sell the other end of the spectrum, now, instead of simply reassuring that bulkiness is not necessary and also very unlikely without massive changes and effort, we try and sell the bulk, be the bulk, Bulk Smash. Extremes sell but guess what, as always, the answer to most questions lies in the middle, close to our instincts and often less fun to talk about at a party.
Our Philosophy
Our philosophy page is often overlooked but it is important in knowing what you get when working with us. The following is more about who we are in general as trainers, researchers and individuals and less about what we are doing when designing training or nutrition programs. But it is that as well.