Today we have another special guest contributing to Perpetual Growth. Tapping into the collective knowledge of experts in the field is an excellent resource when attempting to understand the scientific matters of exercise and fitness. We are lucky enough today to introduce Ian who will outline the importance of understanding post workout pain and the resulting impact on our musculature and central nervous systems.
“Hey Ian, thanks for joining us here at PERPETUAL GROWTH, can you please provide a little background information about yourself and your current studies?“
Ian is a registered physiotherapist with the College of Physiotherapists of Ontario. Ian is currently a PhD student at Queen’s University in Kingston, Ontario, where his research focuses on the role of neck strengthening and motor control of the head and neck in paediatric populations. Ian completed his BSc in Honours Kinesiology at the University of Waterloo in 2008. He recently completed his Master of Science in Physical Therapy degree in 2010 from Queen’s University. Ian is a member of both the Canadian and Ontario Physiotherapy Associations, and currently sits on the executive board for the Paediatric Division of the Canadian Physiotherapy Association. Ian’s extra-curricular interests lie in competitive hockey, weight training, golf, hiking, wakeboarding, and snowboarding.
“Sounds very interesting Ian, you are definitely well on your way to an established career in the field of physiotherapy or Kinesiology.” Without further ado DOMS with IAN!
Resistance training is a deliberate action we undertake with the intent of becoming bigger, stronger

Muscle Fibre
and faster or to lose weight. However, some people may or may not know that when we perform resistance training, we are intentionally causing calculated amounts of damage to our muscles. This tissue damage is essential to making gains in size, speed and strength. Our bodies recognize and remember the type of stress that was placed on it, and automatically begins to adapt itself to resist these specific stresses in the future. These adaptations can include, but are not limited to: increases in muscle fibre size, increases in motor output signals from our brains, increases in bone mass, etc.
As a physiotherapist, prescribing exercises is a big part of my treatment philosophy. Prescribing exercises, shifts the control back into the patient’s hands, they are now responsible for a significant portion of their treatment plan. It also serves to show the patient that they have all the tools to actually fix themselves through carefully prescribed therapeutic exercise. However, one of the most common complaints I received from patients when they came back to see me a few days later, was “the exercises felt pretty good, I had no problem completing them, but today I am even more sore than I was before! I thought these exercises were supposed to help. What is going on??”
This phenomenon of muscle pain and tenderness days after the completion of an exercise routine is referred to as “delayed onset muscles soreness” or “DOMS”. It is characterized by marked muscle tenderness and stiffness beginning 12-48 hours after exercising and usually last for 5-7 days depending on the amount of tissue

DOMS at work
damage (I quickly learned that I needed to warn patients of the risk of DOMS before starting the exercise programme…). You are most likely experiencing DOMS because you have stressed your body in a way in which it is not use to performing on a daily basis. This is a good thing, as you will make bigger gains this way! The main movement that results in the greatest amount of tissue damage is from the eccentric phase of your muscles contraction. The eccentric phase is when there is lengthening of the muscle fibres against resistance. Concentric phase is when the muscle shortens against a resistance. Let’s use a squat as an example. When you are lowering the weight in a controlled manner, your quads are becoming longer – this is the eccentric phase of the muscle contractions. Once you are at the bottom of the movement, you start to extend your hips and knees and rise, your quads are becoming shorter – you are now in the concentric phase of a contraction.
Since eccentric contractions work to forcefully lengthen the muscle, cross-bridges of muscles fibres are torn apart to a greater degree than during a concentric contraction. This is both good and bad (but mostly good). The good part is that this micro-tearing of the muscle fibres is integral to our bodies laying down new proteins, collagen and bone that will increase the size and strength of tissues. The bad part is that is can sometimes be uncomfortable.
DOMS is a complex phenomenon which is still relatively poorly understood. There is no consensus in the scientific literature regarding the mechanism that causes the associated pain with DOMS. It is likely that there are a number of mechanisms that contribute to the delayed pain response after a strenuous workout. The resultant pain is likely a combination of structural micro-damage of muscles or connective tissues and inflammation. Fortunately, or unfortunately (depending on how you look at it…) it doesn’t matter whether you are the guy pushing the most weight in the gym or you are well into your golden years and just starting a walking programme, it appears that no one is immune to the effects of DOMS. Anytime you perform a new exercise, sport or task around the house or yard, you can expect to feel the effect afterwards. Nor is there a way to effectively decrease the effects or duration of DOMS post-exercise. Studies have looked at using ice, anti-inflammatory drugs, massage, stretching, further exercise, ultrasound, and electrotherapy. The results as to the best means of treating DOMS are equivocal.
Now I’m sure there are a number of people out there who have their own solution to DOMS after their workout routine. If it works for them, I say “all the power to them!” and encourage them to continue with whatever means they feel helps them.
The goal of this post was to introduce the topic of DOMS and to let people know that it is normal to feel excessive soreness after a workout. It should be noted however, that even though discomfort associated with DOMS is to be expected, there are certain symptoms that are indicative of a more serious injury. Any sudden onset of sharp pain during movement, any pain that lasts more than 1 week, unexplained bruising or swelling, any stinging, burning or loss of sensation anywhere on your body. These are NOT normal symptoms commonly associated with DOMS. If you experience any of these symptoms, cease all aggravating activities and seek medical attention. Any of these symptoms could be indicative of SIGNIFICANT structural damage to muscle, connective or neural tissue. 
Now, I am the first person to admit that DOMS is not the most pleasant experience one can have. That being said, it is not the worst thing either. So next time you feel stiff and sore following strenuous physical activity, take solace in the fact that although you may be sore today, you know that you reached a level of intensity that adequately stressed your body that will make you stronger tomorrow.
References
Cheung, K., Hume, P. A., & Maxwell, L. (2003). Delayed Onset Muscle Soreness: Treatment Strategies and Performance Factors. Sports Medicine , 33 (2), 145-64.
Connolly, D. A., Sayers, S. P., & McHugh, M. P. (2003). Treatment and Prevention of Delayed Onset Muscle Soreness. Journal of Strength and Conditioning Research , 17 (1), 197-208.
“Ian, great post and your scientific background information relating to DOMS is very informative. Anyone who consistently is looking for growth and improvement in the gym should be well aware of the delayed muscle soreness or “burn” often felt after an intense workout. Just remember DOMS is a good thing as it forces your muscles to grow and adapt to the new stressors place upon them. PERPETUAL GROWTH looks forward to additional blog topics from Ian again in the future.” Thanks Ian!!