Can Exercise Prevent Memory Loss?

My son was watching me go through my Prezi slides for my talk on running next Wednesday when I came across an interesting article on the last page of the Business Times (below).

BT 301021

The author, a medical doctor was writing on preventing memory loss, about how when we find ourselves forgetful, we should not pass it off as aging.

He goes on to talk about how high blood pressure increases in mid life and this appears to be an important risk factor for developing dementia later in life.

There also seems to be a detrimental effect on our health if resting heart rate (HR) is high. The author quoted a Prevention Regimen for Effectively Avoiding Second Strokes (PRoFESS) study, where those with a prior stroke who had a higher resting HR than 67 beats per minute had an accelerated cognitive decline.

So a high HR may be considered as a risk factor for cognitive decline and dementia.

Wow, straight away I thought that this definitely serves as a huge incentive to keep exercising and keep my blood pressure and resting HR low.

So here's good reason for you to attend my Zoom talk on running next Wednesday (3/11/21) so you can keep exercising to prevent memory loss and cognitive decline.

Here is the link to register.

Running Faster May Not Cause Shin Splints

Frequent site of shin pain/ stress fracture

We runners have always been told to train and don't strain. Running too fast, too often, can be a sure recipe for injury. That's why we always have an easy day for recovery after a hard session, to reduce our risk of injury. No runner wants to hear that they have a stress fracture or a small crack in their bones caused by overuse.

We think that when we run faster, we put more strain and load through our muscles and bones. So chances of a muscular or bone stress injury should be higher when we run faster.  We all assume that running slower (or slowly) causes less strain on our legs than running fast.

According to newly published research, fast paced running does not put any more pressure on your tibial (shin bone) which is a common area for shin splints and stress fractures than slow easy runs.

Runners in that study were asked to run at their own selected pace of slow, moderate and fast (but not all out). Reflective sensors were attached to their hips, knees and feet while they ran over force plates that measured impact (load) with each step.

I was really surprised to read that the slow paced runs (and not the fast runs) resulted in the most strain. Running at 'normal' or moderate pace for these runners caused less cumulative load than running the same distance at fast and slower speed.

The authors concluded that running fast does not necessarily cause more load on your tibial (shin bone) than slow running. Well, no excuse not run intervals once a week then if you're training for a race.

However, it may be too early to use this information to change our training habits as fatigue definitely does affect load when we run. Personally, I do feel I need an easy day of training to recover after a hard bike, run or weights session. Even when I was competing, it's usually 2 hard days of training back to back with a easy day (or total rest day) after. That way you won't have to worry about getting injured. Until an an accident strikes ......

Reference

Hunter J, Garcia GK, Shim JK et al (2019). Fast Running Does Not Contribute More Cumulative Load Than Slow Running. Med Sci Sp Ex. 51(6): 1178-1185. DOI: 10.1249/MSS.0000000000001888

Sports Solutions Turns 12

The picture above was taken just outside the clinic when we started at Amoy Street in 2009. So that means our clinic turns 12 today!

We moved to Holland Village in 2014 after my bike accident in 2013 so I didn't have to cycle to the clinic. That was the main reason we moved (now you know).

We are most grateful to everyone on our team and patients that have stood by and supported us all this while. We will continue to do our best to update, improve and progress for our patients. Thank you from the bottom of our hearts.

Ultrasound Or Ultra Bullshit?

When I was doing postgraduate studies in Adelaide back in 2003, I was fortunate to have David Butler as one of our tutors teaching Pain Sciences. He also introduced us to the term 'ultra bullshit' when it came to what he thought about the effectiveness of using ultrasound to treat patients. Especially those patients with chronic pain.

For those of you using therapeutic ultrasound, please do not be offended. I'm not suggesting that you cannot, should not or better not be using it, I'm just saying that we almost never use ultrasound in our clinics to treat patients.

However, I've been receiving therapeutic ultrasound almost daily since my T4 spine fracture last month. Why the sudden change? There have been studies showing that pulsed ultrasound can accelerate bone union by up to a week. I'm up for anything that helps my fracture heal better and faster!

Therapeutic ultrasound appears to effectively heat tissues (muscles, connective tissues etc) but research has not established the ideal temperatures for tissue benefit or tissue damage. Current research also suggests that therapeutic ultrasound will not help pain reduction, delayed onset of muscle soreness (DOMS) or iontophoresis (deliver medicine under the skin), BUT it does appear to facilitate fracture healing. That previous sentence you read was 'a sight for my sore eyes'!

So my beloved wife has been helping daily with my ultrasound regime, although she does delegate the tasks occasionally to my boys as she says it's terribly boring holding on to the ultrasound device.

Looking forward to my next MRI to see how my fracture has healed.

Reference

Eberman L, Schumacher H, Niemann AJ et al (2013). Research Evidence For Therapeutic Ultrasound Effectiveness. Int J Ath Trg. 18(4): 20-22. DOI: 10.1123/ijatt.18.4.20. * Thanks to Byron who got me the article.

The Intricacies Of Our Thoracic Spine

Vertebral body of thoracic spine

Since my accident, I've been researching and reading so I know how to best treat the thoracic spine when it's someone else who's hurt their thoracic spine and ribcage. So this week's post is to share what I've been reading up on the anatomy, structure and function of our thoracic spine.  Also by writing it here, I can always send this link to patients who want to know more. 

Cancellous bone

The vertebral body is not a solid block of bone. In fact, it is just a shell of dense cortical bone (outer surface of bone) surrounding cancellous bone (pictured above). This shell is not strong enough for lengthwise compression and it collapses like a cardboard box with too heavy loads (see picture below).

It is reinforced by vertical struts between the top and bottom surfaces. A strut acts like a solid, but narrow block of bone. As long as it is kept straight, it can sustain immense longitudinal loads.

Vertical struts straining under load (b)

However, struts tend to bend or bow when longitudinal forces are too strong, although a box with vertical struts is still stronger than an empty box.

Stronger with horizontal cross-beams

When cross-beams that are connected are introduced to the struts, the strength of that box is further enhanced. So, when a load is applied, this cross-beams hold the struts in place to prevent them from deforming and preventing the box from collapsing. 

Our vertebral bodies follow this internal architecture described above. The struts and cross-beams are formed by thin rods of bone called vertical (VT) and transverse trabeculae (TT). This trabeculae provides weight bearing strength and resilience to the vertebral body.

Any load applied to the vertebral body is first borne by the vertical trabeculae. When the load is too much, the horizontal trabeculae picks up the slack. Hence the load is sustained by a combination of vertical pressure and transverse tension in the trabeculae.

The advantage of this design (when it is not a solid block of bone) is that a strong but lightweight load bearing structure is constructed with minimal use of bone.

Another benefit is that the space between the trabeculae is used as channels for the blood supply and venous drainage for the vertebral body. Under some conditions, it allows for haemopoiesis (making new red blood cells) and this helps with transmitting load and absorbing force.

So how did my T4 fracture when it is supposed to be strong and resilient? Well, it wasn't just a simple fall, I was rear ended by a motorbike.

References

Bogduk N and Twomey LT (1987). Clinical Anatomy Of The Lumbar Spine. Longman Group UK.

Oliver J and Middleditch A (1991). Functional Anatomy Of The Spine. Butterworth-Heinemann Ltd.

Running With Ankle Weights

Picture by Megan

This week's post is requested by one of our blog's readers who asked about the benefits of running with ankle weights. This reader started using ankle weights when Covid-19 caused gyms to close last year and thought that by strapping on ankle weights, it would be like adding strength training while out walking or running.

Strangely enough, I've noticed a couple of ladies who run pass my home (now that I'm stuck at home mostly after my accident) with ankle or wrist weights too. I suppose once you're aware of them, you start looking out or noticing them.

Let's get into it. We shall start with the benefits first. Running with the ankle weight makes (some of) your leg muscles work harder since the extra weight makes it heavier to walk or run.  Over time, (some of) your muscles get stronger. For instance, if you were running with the ankle weights, it would work your hip flexors more than your hip extensors as the former have to work harder to lift your leg off the ground to prepare for the next foot strike. 

When you take the extra weight off, it makes it easier to run, you can run faster or you may find it easier to run longer distances. The heart and lungs work harder too and over time, your cardiovascular endurance improves. I found a study in 2016 which supports this (Yaacob et al, 2016).

Now for the not so good part of running with ankle weights. Your gait definitely changes when you run with them. There is now added load on your joints, especially your knees, hips, ankles and lower back. This can lead to improper or faulty technique, which may create muscle imbalances and cause injury.

What's worse is if your muscles cannot handle the extra weight, this added load gets transferred to your bones, joints and the articular cartilage. So the risk of carrying a heavier load may outweigh the potential improved performance for runners.

My take? If you have been using them and have no issues or injuries, you can probably carry on. However, if you're a new runner then I will suggest other ways to add training load to improve so as to minimize your chance of getting injured.

Would I run with ankle weights? Most probably not. The closest I came to using something similar was a weight vest. I did this way back in 2000 and 2001 when I was training for the Oxfam 100 km Trailwalker event and I used to walk (not run) up and down the steps in the spectator stands at the old National Stadium to get stronger. 

Reference

Yaacob NM, Yaacob NA, Ismail AA et al (2016). Dumbbells And Ankle-wrist Weight Training Leads To Changes In Body Composition And Anthropometric Parameters With Potential Cardiovascular Disease Risk Reduction. J Taibah Uni Med Sci. 11(5): 439-447. DOI: 10.1016/j.jtumed.2016.06.005