Although modelling studies showed some active lengthening of the contractile (muscular) element during the mid-swing phase of high-speed running, we argue that the increasing distance between the attachment points should not be interpreted as an eccentric action of the CE due to the effects of muscle slack.
#Bochs service series
Later in the swing phase, the contractile element (CE) maintains a near isometric action while the series elastic (tendinous) element first stretches as the knee extends, and then recoils causing the swing leg to forcefully retract prior to ground contact.
However, animal and modelling studies in humans show that the increasing distance between musculotendinous attachment points during forward swing is primarily due to passive lengthening associated with the take-up of muscle slack. It is widely assumed that there is an eccentric hamstring muscle fibre action during the swing phase of high-speed running. Movement analysis, deriving the cause of injuries and prescribing exercise for greater efficiency in performance or rehabilitation are just some of the many applications possible. A solid understanding of this framework developed by Frans Bosch is pivotal when applying these ideas in practice. Through the study of areas such as dynamic systems theory and the field of motor learning, we can begin to understand movement better than previously thought, and develop a building block approach that helps us navigate through even the most chaotic open skill environments. FBS delivers services for coaches, players & therapists that aim to make sense of the many variables at play in optimizing transfer and human movement. Frans Bosch has been a significant worldwide contributor and authority in this area, and Frans Bosch Systems (FBS) has been set up to bring this knowledge to sports and rehab professionals.
One of the key issues in athletic performance and rehabilitation is the ambiguous nature of transfer understanding how training carries over to competition.
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