What does using a foam roller actually do?
Muscles are surrounded by a soft tissue known as fascia. It is thought that this tissue can influence flexibility and joint range of movement. Research suggests that using a foam roller is a form of “Self Myofascial Release” and that it makes the fascia more flexible and breaks down scar tissue and adhesions.
Which one should I buy?
McDonald et al used a roller with a hollow but solid PVC core surrounded by a layer of neoprene foam and had very positive results. Miller and Rockey (2006) used the more traditional roller composed entirely of foam and found rolling made no significant difference to hamstring flexibility. Curran, Fiore and Crisco (2008) compared these 2 types, the Multilevel Rigid Roller and Bio-Foam Roller and found “significantly higher pressure and isolated contact area” with the Multilevel Rigid Roller.
In short, it appears the hollow but solid core design is more effective than the traditional foam roller as it appears to place higher pressure on the fascia. It can be expensive though
How long should I use it for?
McDonald et al got good results from using the roller for just 2 minutes in the form of 2 x 1 minute sessions separated by a rest period of 30 seconds. Other research suggests between 1 and 5 minutes on each muscle group or working until a sensation of release is felt.
The guidance from the research on this is far less clear. In fact, as with many things, there is a lack of in depth research in this area. Most studies seem to focus on the acute effects of using a foam roller rather than long term useage. Miller and Rockey (2006) used the foam roller 3 times per week over 8 weeks but offered no justification in the research as to why. This can hardly be used as guidance considering they also didn’t report any beneficial effects!
What’s the technique?
McDonald et al describe the technique nicely in their article. There are a host of videos on YouTube to look at if you want specific ideas for certain muscles but this is the technique used in McDonald et al’s research;
- Place as much of your body mass as possible on the foam roller (within pain limits).
- Begin at the proximal part of the muscle (the part closest to the body) and roll down the length of the muscle using short kneading like motions.
- One you’ve covered the length of the muscle quickly return to the start position moving the roller in once fluid motion.
- Roll the length of the muscle 3-4 times within each 1 minute session.
Other studies used similar techniques with fairly similar time frames, however what’s more important is what works for you. If you have a technique you find effective for your needs then stick with it. There is also the technique of finding a sore area and holding the pressure on this area for 30-60 seconds or until you feel it release. This can be beneficial but is often very sore!
Conditions its used for
Gastrocnemius and Soleus (calf muscles)
Plantar Fascia itself – using a pedi roller or cold can
Patellofemoral Pain (runners knee)
ITB and TFL (Tensor Fasciae Latae – muscle on the outside of the thigh – roughly where your pocket is)
ITB itself – be cautious when using the foam roller directly over the tender area, work into this gradually. It’s often best to work above the area first.
Medial Tibial Stress Syndrome “Shin Splints”
You’ll see a few areas come up regularly so a programme of rolling calf, quads, ITB and hamstrings will cover most things and could be used for injury prevention as well as treatment.
Does using the roller impair muscle performance?
One of the key findings of McDonald et al was that the roller increased flexibility without reducing muscle performance. Other studies have reported similar findings. As a result some have recommended it as a part of a warm to improve flexibility. However, none of these studied have demonstrated improved running performance or reduced injury rate as a direct result of using a foam roller.
How does it compare to static stretching?
Static stretching used to be a huge part of an athlete’s regime but in recent years research has suggested it may be detrimental to performance and it’s now not recommended prior to sport. It still has a role in improving and maintaining flexibility and I continue to recommend it as part of a cool down after sport or within a rehab programme.
To some degree tight, fairly inflexible tissues can be very effective – they help to transmit the impact of running into forward momentum more efficiently than loose flexible tissues. There tends to be a connection between strength and tissue tightness – tight tissues are often strong. The downside is when this tightness starts to cause pain, affects movement patterns or places structures under a greater tension (e.g. Calf tightness increases tension on the plantar fascia, ITB tightness affects movement of the knee cap, TFL tightness affects the ITB etc).
So like many things, it’s a balance – enough tightness to be effective with enough flexibility to move freely.
D’Amico and Morin compared stretching the hamstrings and using the foam roller in a pilot study, that, as far as I’m aware is yet to be published in a Journal. They concluded that using the roller increased range of movement as much as static stretching but that the foam roller improved isometric strength and jumping ability compared to static stretching (and the control group). They went on to conclude that Self Myofascial Release using a foam roller could be used to aid strength or power performance.
In theory then the foam roller could be used as part of a warm up as it appears to improve flexibility without impairing performance.
Limitations in the research
It’s worth noting that the research on foam rollers isn’t extensive. What is there is fairly limited and has a number of limitations. McDonald et al’s research only involved 11 subjects and all were male. D’Amico and Morin only had 13 subjects and neither studies examined direct the effect of using a foam roller on running performance. There have also been some conflicting studies, such as Miller and Rockey (2006) who found no change in hamstring flexibility after 8 weeks of foam rolling, 3 times per week and there is very little evidence on use of rolling for specific injuries. Clearly further research is needed, until then we can take some guidance from what evidence is available, while being aware of its limitations.