Sunday, November 27, 2022

Will Marathon Running Hurt Your Back?

A patient who came in earlier this week asked if I still did any running. He had signed up for the Singapore marathon early next month and was worried that he may hurt his back taking part. He wanted my views since he had heard about my compression fracture (pictured below) as he had the occasional back ache.

Spot my compression fracture at L1?
I shared with him what I did and showed him the evidence that running definitely did help my low back pain. Of course I am not running as fast nor as long as when I used to race. I hardly run more than 7 km at a go now. Mainly due to a lack of time rather than an inability to.

I also shared with him other evidence of how researchers studied a group of runners who had never attempted a marathon before. 

28 runners (14 males, 14 females) with an average age of 30 signed up for their first marathon and were recruited by researchers. They went for a high resolution MRI screening 16 weeks before (time period 1) the race and another 2 weeks after the race (time period 2). 

The scans were subsequently assessed by senior musculoskeletal radiologists. At time period 1, 61 percent (17 out of the 28) of the runners had disc degeneration at mainly L4-L5 and L5-S1 levels. However, none of them had any back pain nor other symptoms.

Subsequently, the subjects underwent a 16 week training program. 21 out of the 28 runners completed both the 500 miles (800km) training and the race. The other 7 did not complete the training nor started the race. None of them dropped out due to spine related issues.

During time period 2, the researchers found no progression (or worsening) in those who had the disc degeneration in the second MRI. In fact, there was a regression in 2 out of 8 patients with bone marrow oedema in their sacroiliac joints (SIJ). Meaning their scans improved!

The only 'blemish' was one participant who had a small increase in the size of a subcondral cyst. However, this participant remained pain free.

Still thinking about doing that first marathon? Well, you know that running will not wear out your knees nor worsen your back. In fact your joints and connective tissues love movement. Movement lubricates your joints and hydates your connective tissues. So go run that marathon!


Horga LM, Henckel J, Fotiadou A et al (2021). What Happens To The Lower Lumbar Spine After Marathon Running: A 3.0T MRI Study Of 21 First-time Marathoners. Skeletal Radiol. 51: 971-980. DOI: 10.1007/s00256-021-03906-5.

My L1 is 'collapsed' compared to above and below

X-ray of my back 2 weeks after my first accident above.

Sunday, November 20, 2022

Is Yoga Helpful For Low Back Pain?

Please let me be clear, I have nothing against anyone doing yoga or any yoga instructors. I'm just sharing what I read from a published Cochrane review.

This latest Cochrane review that was just published 2 days ago, evaluated whether yoga was beneficial or harmful for treatment of non specific low back pain. Review articles from the Cochrane Database of Systematic Reviews are highly respected and trusted.

The review wanted to find out if yoga helps improve function (getting dressed, walking or housework), quality of life and pain associated with low back pain. Medical databases searched for randomized controlled trials of yoga compared to sham (fake) yoga, no treatment, any other treatment and yoga added to other treatment.

Altogether 21 trials with 2223 participants (mostly women in their 40's or 50's) were found. 10 trials from USA, 5 from India, 2 form UK and 1 each from Crotia, Germany, Sweden and Turkey.

10 studies compared yoga to no exercise control group which received usual education and were put on a waiting list for yoga. 6 studies compared yoga to back-focused exercise or similar core exercise programs.  5 studies compared yoga, no exercise and qigong.

At 3 months, there was low to moderate evidence that yoga was slightly better than no exercise in improving back function and pain, although the difference were not sufficiently important to the person with low back pain

There was low quality evidence for better clinical improvement with yoga while there was moderate quality evidence for a slight improvement in both physical (able to be active) and mental (emotional problems) quality of life.  Evidence was of very low quality for helping depression. In addition there was moderate quality evidence that there was little or no difference between yoga and other types of exercise in improving back function and pain.

Increased low back pain was the most commonly reported 'harmful' reaction and there were no reported cases of serious side effects. There was low quality evidence that the risk of harm was higher with yoga than no exercise and back-focused exercise.

No studies comparing yoga to sham yoga were found, so there is no evidence how yoga would affect low back pain if people did not know they were doing yoga. All the participants knew they were doing yoga and this may influence their interpretation of whether their back pain has changed.

There you have it, quite different from what you have been told, heard or read. Our goal is to help patients confidently take up different movement, postures, physical activity, social and work engagement so you can can a healthy and pain free life.

There are free educational resources to support these processes if you do have low back pain and have not seen us in our clinics.

You can watch this Youtube video or visit this site for more details. This will help reduce stress and build self sufficiency for you to better self manage your LBP and make better informed choices about your care.

Our spine is strong, robust and adaptable. A campaign to change this may encounter resistance even in the physiotherapy and ergonomic professions as their business model may not be in line with what we now know to be best practice for managing low back pain.

So here's my take, whether it's yogapilatesstationary cycling or any exercise, it is your choice, as long as you keep doing it consistently, it will help your low back pain. Find an exercise you enjoy and keep at it. 


Wieland LS, Skoetz N, Pilkington K et al (2022). Yoga For Chronic Non-specific Low Back Pain. Cochrane Database of Systematic Reviews. Issue 11. Art. No : CD010671. DOI: 10.1002/1465.CD010671

Sunday, November 13, 2022

Should You Be Taking Creatine?

I remember friends talking about creatine making them 'fly' while racing, back in the late 1990's, when I was still competing. Now, it seems that taking creatine is in vogue again after a few patients asked for my opinion about whether creatine is performance enhancing.

Creatine use back in the 90's was popular because it actually did what was claimed on the container (unlike many other supplements). It definitely changed how sports nutrition was viewed.

Creatine is a natural compound in our body produced from amino acids. It is also found in red meat and some fish. In our muscles, it is called phosphocreatine (or free creatine) where it is necessary for enabling movement and exercise. Phosphocreatine is responsible for quickly restoring ATP levels in muscles, which functions as the 'energy currency' for cells. 

ATP is broken down (or used) when our muscles contract during exercise and other activities. Phosphocreatine provides a qiuck pool of energy to allow quick restoration of ATP, which is fuel especially for high intensity exercise. Since creatine exist only in small amounts in the body, it is enough to fuel about 10 seconds of intense effort or all out sprint. Hence this is the 'free creatine' energy we all have in our bodies when needed for that 10 seconds worth of intense exercise.

Note that the body can also produce ATP from carbohydrates and fat, but it is a relatively slow process.

How creatine works is that it is able to produce strength gains because it enhances the short term, high intensity energy pathway in muscles called the phospho-creatine (PC) system. 

If the PC system is enhanced, it allows our muscle fibers to contract vigorously for longer periods allowing more intense loading and fatigue for the muscles. After the muscles break down, it produces greater repair and growth stimulus with adequate rest and nutrition This ultimately results in greater strength gains.

Taking creatine supplements can increase creatine stores in the body by up to 30 percent. Many types of creatine are available, the cheapest and most researched being creatine monohydrate. Bear in mind that the pricier creatine hydrochloride and ethyl ester have not been proven to be superior.

Many people who take creatine start with a loading phase of 20-30 grams per day (for up to 7 days) to saturate stores quickly, leading to a rapid increase in muscle stores of creatine. Subsequently, they take 3-5 grams daily to maintain levels.

Those who choose not to load will consume 3-5 grams daily. Research shows this is just as effective and it will take up to a month to maximise stores this way before it has an effect. 

A known side effect of consuming creatine is weight gain since creatine causes water retention in your muscles. This weight gain varies between 1-3 kg and not everyone who takes creatine experiences it. It can also cause mild stomach discomfort when large doses are taken. Long term supplementation with high doses have been investigated and shown to be safe in healthy subjects (Kreider et al, 2017).

Creatine supplementation is extremely popular with sprinters, strength and power athletes, especially when their events last for less than 30 seconds. It increases muscle mass and strength during weight training as well as improving performance during competition. 

Since body weight is not as important in sprints, weight and power lifting, athletes from these sports can benefit as increases in performance more than compensates for the increase in body weight.

Those who participate in sports like soccer, basketball or hockey when intermittent short bursts of high intensity sprints and jumps are required will benefit with creatine supplementation. Specific tests where power output and speed are improved have been shown in athletes in such sports (Ramirez- Campillo et al, 2016).

What about endurance sports? In ultra events, the need for high intensity surges or bursts are less frequent, so as exercise duration increases, benefits of creatine reduces. Research on endurance sports are mixed though most show no benefit. An increase in body weight from consuming creatine may increase energy requirements and require greater power output.  

I was asked why I took creatine supplements since research does not show much support when I used to race triathlons. I mainly raced the Olympic distance (1.5km swim, 40km bike, 10 km run) triathlons where fellow competitiors may surge on the climbs during the bike or run section to breakaway or get a gap. As such, we do need to respond to such high intensity surges otherwise the race may be over if you get dropped

This was the main reason I thought taking creatine may help, since I needed to be able to sprint intermittently during my event, especially up slopes or near the end of a race. Studies that investigate cycling using stationary bikes where slight increases in body weight may not affect performances show benefits from taking creatine. This may occur in similar scenarios that I mentioned in a climb during a race or a sprint finish where there is a need for higher power output or speed (Murphy et al, 2005). 

At these times, phosphocreatine contribute heaps to energy production, so an increase in creatine stores may be helpful. Bear in mind that the increase in body weight that sometime accompanies creatine supplementation is sufficient to cancel out the benefits. Especially in a hilly or longer race.

Utimately I stopped taking creatine supplements after 3 months because I did put on 1-2 kg of body weight. In addition I was not sure if it helped my ability to sprint and close gaps. I naturally have a good amount of Type IIa and IIb fast twitch muscle fibers already so the weight gain was not justified.

If you, like my patients, have heard good results about creatine and want to try it, bear in mind the scenarios that I mentioned.


Kreider B, Kalman DS, Antonio J (2017). International Society Of Sports Nutrition Position Stand: Safety And Efficacy Of Creatine Supplementation In Exercise, Sport, And Medicine. J Int Soc Sp Nutr. 14:18. DOI: 10.1186/s12970-017-0173-z

Murphy AJ, Watsford ML, Coutts AJ et al (2005). Effects Of Creatine Supplementation On Aerobic Power And Cardiovascular Structure And Function. J Sci Med Sp. 8(3): 305-313. DOI: 10.1016/s1440-2440(05)80041-6.

Ramirez-Campillo R, Gonzalez-Jurado R, Martinez C et al (2016). Effects Of Plyometric Training And Creatine Supplementation On Maximal-intensity Exercise And Endurance In Female Soccer Players. J Sp Med Sci. 19(8): 682-687. DOI: 10.1016/j.jsams.2015.005. DOI: 10.1016/j.jsams.2015.10.005

Sunday, November 6, 2022

Only Some Runners Ran Faster Using Carbon Plated Shoes

Alphafly (L) and Vaporfly from
Ever since Kipchoge ran a sub-2 hour marathon in the carbon plated Nike Alphafly in 2019, every single of my patients who participate in running races want to race in a pair too. Back then, those super shoes were really hard to get a hold of, for almost a year. If you did get your hands on a pair, they cost a bomb too.

Now that these super shoes are more easily available (since many other brands other than Nike also make carbon plated shoes), is it worth splurging on them? Especially if you're trying to clock a personal best timing in your next race.

How does the original Nike super shoe (the Vaporfly) work? There are 2 novel components to this question. First, the super thick cushioned midsole Nike calls ZoomX. This new foam is super light, 31 millimeters high at the heel, which is 50 percent thicker than comparable shoes without being heavier. You can squish it and it springs back to shape quickly. This means it returns all the energy you applied to squish it. 

Next is the curved carbon fiber plate inside the midsole (pictured above). It is thought that the carbon fiber plate(s) acts like a spring, bending as your foot lands and then catapulting you forward as it springs back into position. This helps running economy (reduces energy expenditure) so you can run faster.

Ever since Nike launched their Vaporfly in 2017, which has since been updated a few times, there have been calls and debates to have the shoe disallowed in competition. Opposers have labelled the shoe as technical 'doping'. When subsequent studies showed that these Nike shoes gave up to a 4 percent advantage (Barnes and Kilding, 2019), other runners were obviously upset

Especially after two Nike sponsored runners in the United States used the prototype version at the 2016 Olympic trials (women's 1st and 3rd places) and qualified for the Olympics.

Shalaya Kipp felt that the prototype Vaporfly's kept her training partner, Kara Goucher (4th place), off the Olympic team after signing up with Skechers. She left Nike in 2014 beacause of the infamous Alberto Salazar "Oregon project". Had Goucher stayed with Nike, she may have qualified for her third Olympics in 2016. At the actual 2016 Olympics, the top 3 male finishers all wore the same Nike prototype shoe.

In fact Nike scored a major coup when they offered all other runners who qualified in the 2020 USA marathon Olympic trials a pair of the Alphafly's to level the playing field.

Before you buy a pair of carbon plated shoes, consider the following study. It was published just last month looking at 96 runners using 2 different prototypes of carbon plated  shoes. The shoes differed only by the forefoot bending stiffness. The runners were first assessed for their VO2 max and maximum aerobic speed. Running economy and stride kinematics were also recorded during the trials. 

The researchers did not find any significant difference in running economy between the 2 different shoe stiffness for the group as a whole. Some runners' running economy improved when the carbon fiber plate was stiffer while in other runners, their running economy deteriorated. To be more specific, the faster runners took advantage of the increased stiffness (carbon fiber plates) while the slower runners did not.

The authors emphasized the importance of individual response to using carbon fiber plates to enhance running performance is runner specific. 

For now, the carbon plates remain street legal for us mortal runners in competition. If you do get them, remember to break them in with a few runs instead of just saving them for race day. The midsole thickness definitely makes your foot more unstable especially when going around sharp corners or while making a u-turn in an out and back route.


BarnesKR and Kilding AE(2019). A Randomized Crossover Study Investigating The Running Economy Of Highly-Trained Male And Female Distance Runners In Marathon Racing Shoes Versus Track Spikes. Sports Med. 49(2): 331-342. DOI: 10.1007/s40279-018-1012-3.

Beck ON, Golyski PR and Sawiki GS (2020). Adder Carbon Fiber To Shoe Soles May Not Improve Running Economy: A Muscle-level Explanation. Sci Rep. 10: 17154. DOI: 10.1038/s41598-020-74097-7

Chollet M, Michlet S, Horvais N et al (2022). Individual Physiological Responses To Changes In Shoe Bending Stiffness: A Cluster Analysis Study On 96 Runners. Eur J Appl Physiol. DOI: 10.1007/s00421-022-05060-9