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In a number of recent posts and videos on my youtube channel I have been mentioning the potential benefits of isometric (and eccentric and plyometric muscular actions - these two in particular). However, in the process of writing an article for Athletics Weekly on cross-country conditioning I found some interesting research on the role of isometric activity for these athletes.
The full article will be out Thursday 20th Sep, but here's a taste and some of the unused material. It will show that this often-negelacted aspect of sports conditioning - isometric training - can play an important role. As indicated I will be looking to introduce more isometric and eccentric weight training into my training group's activities this preparation period. It seems to be able to offer numerous benefits.
Sports scientists studied the incidence of injury in cross-county runners and have noted that performing specific strengthening exercises can reduce the on-set of injury across a season.
One survey looked at knee and shin muscle injury in high school athletes.
The team wanted to see specifically whether the cross-country runners’ hip and knee muscle strength influenced whether they sustained injury. They specifically measured isometric hip and knee power.
An isometric muscular action in a “non-movement” one - muscles work against each other, or a resistance, but with no actual movement takes place. Examples of isometric exercises that would strengthen the knee muscles would include 1: using a leg press machine to press the weight away and then bringing it back so that the knee angle is around 90 degrees, whilst then holding the weight in that position for a given time, for example 8 seconds and 2: a wall squat, held perhaps for 20 seconds.
Note: Isometric strength is very specific to the angle at which force is applied so in order to fully develop it different angles of application should be used.
Returning to the study sixty-eight cross-country runners (47 girls, 21 boys) were involved and they were monitored across the entire 2014 season.
It was discovered that:
During the season, three (4.4%) runners experienced knee pain and 13 (19.1%) shin injury. More specifically, it was discovered that hip strength was related to knee injury, with the isometrically weaker cross-country runners being significantly more predisposed to injury in this area.
However, when it came to shin injury the team noted that hip and knee muscle strength was not significantly associated with injury.
Perhaps this can be explained by the fact that shin injuries are less dependent on specific strength (although this can be of benefit) and are often likely the result of exposure to too high mileages or running on different surfaces too soon. Avoidance of these types of injuries is therefore very reflexive of training load, rest and recovery season demands and session planning. The requirements of a full-on cross-county programme may therefore have been the main reason for the runners sustaining shin pain.
Hopefully this info will show how training different muscular actions in this case isometric, can aid injury avoidance. Look out for more on this subject and eccentric activity in future posts and videos.