Why are my muscles sore after exercise? Hint: it’s nothing to do with lactic acid
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As many of us hit the gym or go for a run to recover from the silly season, you might notice a bit of extra muscle soreness.
This is especially true if it has been a while between workouts.
A common misunderstanding is that such soreness is due to lactic acid build-up in the muscles.
Research, however, shows lactic acid has nothing to do with it. The truth is far more interesting, but also a bit more complex.
It’s not lactic acid
We’ve known for decades that lactic acid has nothing to do with muscle soreness after exercise.
In fact, as one of us (Robert Andrew Robergs) has long argued, cells produce lactate, not lactic acid. This process actually opposes not causes the build-up of acid in the muscles and bloodstream.
Unfortunately, historical inertia means people still use the term “lactic acid” in relation to exercise.
Lactate doesn’t cause major problems for the muscles you use when you exercise. You’d probably be worse off without it due to other benefits to your working muscles.
Lactate isn’t the reason you’re sore a few days after upping your weights or exercising after a long break.
So, if it’s not lactic acid and it’s not lactate, what is causing all that muscle soreness?
Muscle pain during and after exercise
When you exercise, a lot of chemical reactions occur in your muscle cells. All these chemical reactions accumulate products and by-products which cause water to enter into the cells.
That causes the pressure inside and between muscle cells to increase.
This pressure, combined with the movement of molecules from the muscle cells can stimulate nerve endings and cause discomfort during exercise.
The pain and discomfort you sometimes feel hours to days after an unfamiliar type or amount of exercise has a different list of causes.
If you exercise beyond your usual level or routine, you can cause microscopic damage to your muscles and their connections to tendons.
Such damage causes the release of ions and other molecules from the muscles, causing localised swelling and stimulation of nerve endings.
This is sometimes known as “delayed onset muscle soreness” or DOMS.
While the damage occurs during the exercise, the resulting response to the injury builds over the next one to two days (longer if the damage is severe). This can sometimes cause pain and difficulty with normal movement.
The upshot
Research is clear; the discomfort from delayed onset muscle soreness has nothing to do with lactate or lactic acid.
The good news, though, is that your muscles adapt rapidly to the activity that would initially cause delayed onset muscle soreness.
So, assuming you don’t wait too long (more than roughly two weeks) before being active again, the next time you do the same activity there will be much less damage and discomfort.
If you have an exercise goal (such as doing a particular hike or completing a half-marathon), ensure it is realistic and that you can work up to it by training over several months.
Such training will gradually build the muscle adaptations necessary to prevent delayed onset muscle soreness. And being less wrecked by exercise makes it more enjoyable and more easy to stick to a routine or habit.
Finally, remove “lactic acid” from your exercise vocabulary. Its supposed role in muscle soreness is a myth that’s hung around far too long already.
Robert Andrew Robergs, Associate Professor – Exercise Physiology, Queensland University of Technology and Samuel L. Torrens, PhD Candidate, Queensland University of Technology
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Red Light, Go!
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Casting Yourself In A Healthier Light
In Tuesday’s newsletter, we asked you for your opinion of red light therapy (henceforth: RLT), and got the above-depicted, below-described, set of responses:
- About 51% said “I have no idea whether light therapy works or not”
- About 24% said “Red light therapy is a valuable skin rejuvenation therapy”
- About 23% said “I have not previously heard of red light therapy”
- One (1) person said: “Red light therapy is a scam to sell shiny gadgets”
A number of subscribers wrote with personal anecdotes of using red light therapy to beneficial effect, for example:
❝My husband used red light therapy after surgery on his hand. It did seem to speed healing of the incision and there is very minimal scarring. I would like to know if the red light really helped or if he was just lucky❞
~ 10almonds subscriber
And one wrote to report having observed mixed results amongst friends, per:
❝Some people it works, others I’ve seen it breaks them out❞
~ 10almonds subscriber
So, what does the science say?
RLT rejuvenates skin, insofar as it reduces wrinkles and fine lines: True or False?
True! This one’s pretty clear-cut, so we’ll just give one example study of many, which found:
❝The treated subjects experienced significantly improved skin complexion and skin feeling, profilometrically assessed skin roughness, and ultrasonographically measured collagen density.
The blinded clinical evaluation of photographs confirmed significant improvement in the intervention groups compared with the control❞
~ Dr. Alexander Wunsch & Dr. Karsten Matuschka
RLT helps speed up healing of wounds: True or False?
True! There is less science for this than the above claim, but the studies that have been done are quite compelling, for example this NASA technology study found that…
❝LED produced improvement of greater than 40% in musculoskeletal training injuries in Navy SEAL team members, and decreased wound healing time in crew members aboard a U.S. Naval submarine.❞
Read more: Effect of NASA light-emitting diode irradiation on wound healing
RLT’s benefits are only skin-deep: True or False?
False, probably, but we’d love to see more science for this, to be sure.
However, it does look like wavelengths in the near-infrared spectrum reduce the abnormal tau protein and neurofibrillary tangles associated with Alzheimer’s disease, resulting in increased blood flow to the brain, and a decrease in neuroinflammation:
Therapeutic Potential of Photobiomodulation In Alzheimer’s Disease: A Systematic Review
Would you like to try RLT for yourself?
There are some contraindications, for example:
- if you have photosensitivity (for obvious reasons)
- if you have Lupus (mostly because of the above)
- if you have hyperthyroidism (because if you use RLT to your neck as well as face, it may help stimulate thyroid function, which in your case is not what you want)
As ever, please check with your own doctor if you’re not completely sure; we can’t cover all bases here, and cannot speak for your individual circumstances.
For most people though, it’s very safe, and if you’d like to try it, here’s an example product on Amazon, and by all means do read reviews and shop around for the ideal device for you
Take care! 😎
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Is chocolate milk a good recovery drink after a workout? A dietitian reviews the evidence
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Whether you enjoy chocolate milk regularly, as a weekend treat, or as an occasional dose of childhood nostalgia, it probably wouldn’t be the first option you think of for post-workout recovery.
Unless you’re on TikTok, perhaps. According to many people on the social media platform, chocolate milk is not only delicious, but it offers benefits comparable to sports drinks after a workout.
So is there any evidence to support this? Let’s take a look.
eldar nurkovic/Shutterstock Rehydrating after a workout is important
Water accounts for somewhere between 50% and 60% of our body weight. Water has many important functions in the body, including helping to keep our body at the right temperature through sweating.
We lose water naturally from our bodies when we sweat, as well as through our breathing and when we go to the toilet. So it’s important to stay hydrated to replenish the water we lose.
When we don’t, we become dehydrated, which can put a strain on our bodies. Signs and symptoms of dehydration can range from thirst and dizziness to low blood pressure and confusion.
Athletes, because of their higher levels of exertion, lose more water through sweating and from respiration (when their breathing rate gets faster). If they’re training or competing in hot or humid environments they will sweat even more.
Dehydration impacts athletes’ performance and like for all of us, can affect their health.
So finding ways to ensure athletes rehydrate quickly during and after they train or compete is important. Fortunately, sports scientists and dietitians have done research looking at the composition of different fluids to understand which ones rehydrate athletes most effectively.
The beverage hydration index
The best hydrating drinks are those the body retains the most of once they’ve been consumed. By doing studies where they give people different drinks in standardised conditions, scientists have been able to determine how various options stack up.
To this end, they’ve developed something called the beverage hydration index, which measures to what degree different fluids hydrate a person compared to still water.
According to this index beverages with similar fluid retention to still water include sparkling water, sports drinks, cola, diet cola, tea, coffee, and beer below 4% alcohol. That said, alcohol is probably best avoided when recovering from exercise.
Beverages with superior fluid retention to still water include milk (both full-fat and skim), soy milk, orange juice and oral rehydration solutions.
This body of research indicates that when it comes to rehydration after exercise, unflavoured milk (full fat, skim or soy) is better than sports drinks.
But what about chocolate milk?
A small study looked at the effects of chocolate milk compared to plain milk on rehydration and exercise performance in futsal players (futsal is similar to soccer but played on a court indoors). The researchers found no difference in rehydration between the two. There’s no other published research to my knowledge looking at how chocolate milk compares to regular milk for rehydration during or after exercise.
But rehydration isn’t the only thing athletes look for in sports drinks. In the same study, drinking chocolate milk after play (referred to as the recovery period) increased the time it took for the futsal players to become exhausted in further exercise (a shuttle run test) four hours later.
This was also shown in a review of several clinical trials. The analysis found that, compared to different placebos (such as water) or other drinks containing fat, protein and carbohydrates, chocolate milk lengthened the time to exhaustion during exercise.
What’s in chocolate milk?
Milk contains protein, carbohydrates and electrolytes, each of which can affect hydration, performance, or both.
Protein is important for building muscle, which is beneficial for performance. The electrolytes in milk (including sodium and potassium) help to replace electrolytes lost through sweating, so can also be good for performance, and aid hydration.
Compared to regular milk, chocolate milk contains added sugar. This provides extra carbohydrates, which are likewise beneficial for performance. Carbohydrates provide an immediate source of energy for athletes’ working muscles, where they’re stored as glycogen. This might contribute to the edge chocolate milk appears to have over plain milk in terms of athletic endurance.
The added sugar in chocolate milk provides extra carbohydrates. Brent Hofacker/Shutterstock Coffee-flavoured milk has an additional advantage. It contains caffeine, which can improve athletic performance by reducing the perceived effort that goes into exercise.
One study showed that a frappe-type drink prepared with filtered coffee, skim milk and sugar led to better muscle glycogen levels after exercise compared to plain milk with an equivalent amount of sugar added.
So what’s the verdict?
Evidence shows chocolate milk can rehydrate better than water or sports drinks after exercise. But there isn’t evidence to suggest it can rehydrate better than plain milk. Chocolate milk does appear to improve athletic endurance compared to plain milk though.
Ultimately, the best drink for athletes to consume to rehydrate is the one they’re most likely to drink.
While many TikTok trends are not based on evidence, it seems chocolate milk could actually be a good option for recovery from exercise. And it will be cheaper than specialised sports nutrition products. You can buy different brands from the supermarket or make your own at home with a drinking chocolate powder.
This doesn’t mean everyone should look to chocolate milk when they’re feeling thirsty. Chocolate milk does have more calories than plain milk and many other drinks because of the added sugar. For most of us, chocolate milk may be best enjoyed as an occasional treat.
Evangeline Mantzioris, Program Director of Nutrition and Food Sciences, Accredited Practising Dietitian, University of South Australia
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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What’s Missing from Medicine – by Dr. Saray Stancic
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Another from the ranks of “doctors who got a serious illness and it completely changed how they view the treatment of serious illness”, Dr. Stancic was diagnosed with multiple sclerosis, and wasn’t impressed with the treatments presented.
Taking an evidence-based lifestyle medicine approach, she was able to not only manage her illness sufficiently to resume her normal activities, but even when so far as to run a marathon, and today boasts a symptom-free, active life.
The subtitular six lifestyle changes are not too shocking, and include a plants-centric diet, good exercise, good sleep, stress management, avoidance of substance abuses, and a fostering of social connections, but the value here is in what she has to say about each, especially the ones that aren’t so self-explanatory and/or can even cause harm if done incorrectly (such as exercise, for example).
The style is on the academic end of pop-science, of the kind that has frequent data tables, lots of statistics, and an extensive bibliography, but is still very readable.
Bottom line: if you are faced with a chronic disease, or even just an increased risk of some chronic disease, or simply like to not take chances, then this is a high-value book for you.
Click here to check out What’s Missing From Medicine, and enjoy chronic good health!
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Tranquility by Tuesday?
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I Know How She Does It: How Successful Women Make The Most of Their Time
This is Laura Vanderkam, author of “Tranquility By Tuesday” (amongst other books). Her “thing” is spending more time on what’s important, and less on what isn’t. Sounds simple, but she’s made a career out of it, so condensed here for you are…
Laura’s 7 Keys To Productivity
Key One: Plan your weeks on Fridays
You don’t want your Monday morning to be a “James Bond intro” (where everything is already in action and you’re just along for the ride, trying to figure out what’s going on). So, take some time last thing each Friday, to plan ahead for the following week!
Key Two: Measure what matters
Whatever that means to you. Laura tracks her use of time in half-hour blocks, and likes keeping track of streaks. For her, that means running daily and keeping a log of it. She also keeps track of the books she reads. For someone else it could be music practice, or a Duolingo streak, or eating fruit each day.
On which note…
“Dr. Greger’s Daily Dozen” is simpler than most nutrition trackers (where you must search for everything you eat, or scan barcodes for all ingredients).
Instead, it keeps track of whether you are having certain key health-giving foods often enough to maintain good health.
We might feature his method in a future edition of 10almonds, but for now, check the app out for yourself here:
Get Dr. Greger’s Daily Dozen on iOS / Get Dr. Greger’s Daily Dozen on Android
Dr. Greger’s Daily Dozen @ Nutrition Facts
Key Three: Figure out 2–3 “anchor” events for the weekend
Otherwise, it can become a bit of a haze and on Monday you find yourself thinking “where did the weekend go?”. So, plan some stuff! It doesn’t have to be anything out-of-this-world, just something that you can look forward to in advance and remember afterwards. It could be a meal out with your family, or a session doing some gardening, or a romantic night in with your partner. Whatever makes your life “living” and not passing you by!
Key Four: Tackle the toughest work first
You’ve probably heard about “swallowing frogs”. If not, there are various versions, usually attributed to Mark Twain.
Here’s one:
“If it’s your job to eat a frog, it’s best to do it first thing in the morning. And if it’s your job to eat two frogs, it’s best to eat the biggest one first.”
Top Productivity App “ToDoist” has an option for this, by the way!
Laura’s key advice here is: get the hard stuff done now! Before you get distracted or tired and postpone it to tomorrow (and then lather rinse repeat, so it never gets done)
10almonds Tip:
“But what if something’s really important but not as pressing as some less important, but more urgent tasks?”
Simple!
Set a timer (we love the Pomodoro method, by the way) and do one burst of the important-but-not-urgent task first. Then you can get to the more urgent stuff.
Repeat each day until the important-but-not-urgent task is done!
The 10almonds Team
Key Five: Use bits of time well
If, like many of us, you’ve a neverending “to read” list, use the 5–10 minute breaks that get enforced upon us periodically through the day!
- Use those few minutes before a meeting/phonecall!
- Use the time you spend waiting for public transport or riding on it!
- Use the time you spent waiting for a family member to finish doing a thing!
All those 5–10 minute bits soon add up… You might as well spend that time reading something you know will add value to your life, rather than browsing social media, for example.
Key Six: Make very short daily to-do lists
By “short”, Laura considers this “under 10 items”. Do this as the last part of your working day, ready for tomorrow. Not at bedtime! Bedtime is for winding down, not winding up
Key Seven: Have a bedtime
Laura shoots for 10:30pm, but whatever works for you and your morning responsibilities. Your morning responsibilities aren’t tied to a specific time? Lucky you, but try to keep a bedtime anyway. Otherwise, your daily rhythm can end up sliding around the clock, especially if you work from home!
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Walking can prevent low back pain, a new study shows
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Do you suffer from low back pain that recurs regularly? If you do, you’re not alone. Roughly 70% of people who recover from an episode of low back pain will experience a new episode in the following year.
The recurrent nature of low back pain is a major contributor to the enormous burden low back pain places on individuals and the health-care system.
In our new study, published today in The Lancet, we found that a program combining walking and education can effectively reduce the recurrence of low back pain.
PeopleImages.com – Yuri A/Shutterstock The WalkBack trial
We randomly assigned 701 adults who had recently recovered from an episode of low back pain to receive an individualised walking program and education (intervention), or to a no treatment group (control).
Participants in the intervention group were guided by physiotherapists across six sessions, over a six-month period. In the first, third and fifth sessions, the physiotherapist helped each participant to develop a personalised and progressive walking program that was realistic and tailored to their specific needs and preferences.
The remaining sessions were short check-ins (typically less than 15 minutes) to monitor progress and troubleshoot any potential barriers to engagement with the walking program. Due to the COVID pandemic, most participants received the entire intervention via telehealth, using video consultations and phone calls.
Low back pain can be debilitating. Karolina Kaboompics/Pexels The program was designed to be manageable, with a target of five walks per week of roughly 30 minutes daily by the end of the six-month program. Participants were also encouraged to continue walking independently after the program.
Importantly, the walking program was combined with education provided by the physiotherapists during the six sessions. This education aimed to give people a better understanding of pain, reduce fear associated with exercise and movement, and give people the confidence to self-manage any minor recurrences if they occurred.
People in the control group received no preventative treatment or education. This reflects what typically occurs after people recover from an episode of low back pain and are discharged from care.
What the results showed
We monitored the participants monthly from the time they were enrolled in the study, for up to three years, to collect information about any new recurrences of low back pain they may have experienced. We also asked participants to report on any costs related to their back pain, including time off work and the use of health-care services.
The intervention reduced the risk of a recurrence of low back pain that limited daily activity by 28%, while the recurrence of low back pain leading participants to seek care from a health professional decreased by 43%.
Participants who received the intervention had a longer average period before they had a recurrence, with a median of 208 days pain-free, compared to 112 days in the control group.
In our study, regular walking appeared to help with low back pain. PeopleImages.com – Yuri A/Shutterstock Overall, we also found this intervention to be cost-effective. The biggest savings came from less work absenteeism and less health service use (such as physiotherapy and massage) among the intervention group.
This trial, like all studies, had some limitations to consider. Although we tried to recruit a wide sample, we found that most participants were female, aged between 43 and 66, and were generally well educated. This may limit the extent to which we can generalise our findings.
Also, in this trial, we used physiotherapists who were up-skilled in health coaching. So we don’t know whether the intervention would achieve the same impact if it were to be delivered by other clinicians.
Walking has multiple benefits
We’ve all heard the saying that “prevention is better than a cure” – and it’s true. But this approach has been largely neglected when it comes to low back pain. Almost all previous studies have focused on treating episodes of pain, not preventing future back pain.
A limited number of small studies have shown that exercise and education can help prevent low back pain. However, most of these studies focused on exercises that are not accessible to everyone due to factors such as high cost, complexity, and the need for supervision from health-care or fitness professionals.
On the other hand, walking is a free, accessible way to exercise, including for people in rural and remote areas with limited access to health care.
Walking has a variety of advantages. Cast Of Thousands/Shutterstock Walking also delivers many other health benefits, including better heart health, improved mood and sleep quality, and reduced risk of several chronic diseases.
While walking is not everyone’s favourite form of exercise, the intervention was well-received by most people in our study. Participants reported that the additional general health benefits contributed to their ongoing motivation to continue the walking program independently.
Why is walking helpful for low back pain?
We don’t know exactly why walking is effective for preventing back pain, but possible reasons could include the combination of gentle movements, loading and strengthening of the spinal structures and muscles. It also could be related to relaxation and stress relief, and the release of “feel-good” endorphins, which block pain signals between your body and brain – essentially turning down the dial on pain.
It’s possible that other accessible and low-cost forms of exercise, such as swimming, may also be effective in preventing back pain, but surprisingly, no studies have investigated this.
Preventing low back pain is not easy. But these findings give us hope that we are getting closer to a solution, one step at a time.
Tash Pocovi, Postdoctoral research fellow, Department of Health Sciences, Macquarie University; Christine Lin, Professor, Institute for Musculoskeletal Health, University of Sydney; Mark Hancock, Professor of Physiotherapy, Macquarie University; Petra Graham, Associate Professor, School of Mathematical and Physical Sciences, Macquarie University, and Simon French, Professor of Musculoskeletal Disorders, Macquarie University
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Goat Milk Greek Yogurt vs Almond Milk Greek Yogurt – Which is Healthier?
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Our Verdict
When comparing goat milk yogurt to almond milk yogurt, we picked the almond milk yogurt.
Why?
Surprised? Honestly, we were too!
Much as we love almonds, we were fully expecting to write about how they’re very close in nutritional value, but the dairy yogurt has more probiotics, but no, as it turns out when we looked into them, they’re quite comparable in that regard.
It’s easy to assume “goat milk yogurt is more natural and therefore healthier”, but in both cases, it was a case of taking a fermentable milk, and fermenting it (an ancient process). “But almond milk is a newfangled thing”, well, new-ish…
So what was the deciding factor?
In this case, the almond milk yogurt has about twice the protein per (same size) serving, compared to the goat milk; all the other macros are about the same, and the micronutrients are similar. Like many plant-based milks and yogurts, this one is fortified with calcium and vitamin D, so that wasn’t an issue either.
In short: the only meaningful difference was the protein, and the almond came out on top.
However!
The almond came out on top only because it is strained; this can be done (or not) with any kind of yogurt, be it from an animal or a plant.
In other words: if it had been different brands, the goat milk yogurt could have come out on top!
The take-away idea here is: always read labels, because as you’ve just seen, even we can get surprised sometimes!
seriously if you only remember one thing from this today, make it the above
Other thing worth mentioning: yogurts, and dairy products in general, are often made with common allergens (e.g. dairy, nuts, soy, etc). So if you are allergic or intolerant, obviously don’t choose the one to which you are allergic or intolerant.
That said… If you are lactose-intolerant, but not allergic, goat’s milk does have less lactose than cow’s milk. But of course, you know your limits better than we can in this regard.
Want to try some?
Amazon is not coming up with the goods for this one (or anything even similar, at time of writing), so we recommend trying your local supermarket (and reading labels, because products vary widely!)
What you’re looking for (be it animal- or plant-based):
- Live culture probiotic bacteria
- No added sugar
- Minimal additives in general
- Lastly, check out the amounts for protein, calcium, vitamin D, etc.
Enjoy!
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