Journal of Applied Physiology
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J Appl Physiol (October 26, 2006). doi:10.1152/japplphysiol.00274.2006
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Submitted on March 2, 2006
Accepted on October 23, 2006

Intensity and Muscle specific fascicle behavior during human drop jumps

Filipa Sousa1, Masaki Ishikawa2*, Paulo J Vilas-Boas3, and Paavo V. Komi2

1 University of Jyvaskyla, Neuromuscular Research Center, Department of Biology of Physical Activity, Jyvaskyla, Finland; University of Porto, Laboratory of Biomechanics,Faculty of Sports, Porto, Portugal
2 University of Jyvaskyla, Neuromuscular Research Center, Department of Biology of Physical Activity, Jyvaskyla, Finland
3 University of Porto, Laboratory of Biomechanics,Faculty of Sports, Porto, Portugal

* To whom correspondence should be addressed. E-mail: masaki{at}sport.jyu.fi.

The present study was designed to examine fascicle-tendon interaction in the synergistic medial gastrocnemius (MG) and soleus (SOL) muscles during drop jumps (DJ) performed from different drop heights (DH). Eight subjects performed unilateral DJ with maximal rebounds on a sledge apparatus from different DH. During the exercises, fascicle lengths (using ultrasonography) and electromyographic activities were recorded. The results showed that the fascicles of the MG and SOL muscles behaved differently during the contact phase, but the whole muscle-tendon unit (MTU) and its tendinous tissue lengthened prior to shortening in both muscles. The SOL fascicles also lengthened prior to shortening during the ground contact in all conditions. During the braking phase, the SOL activation increased with increasing DH. However, the amplitude of SOL fascicle lengthening was not dependent upon DH during the same phase. In the MG muscle, the fascicles primarily shortened during the braking phase in the lower DH condition. However, in the higher DH conditions, the MG fascicles either behaved isometrically or were lengthened during the braking phase. These results suggest that the fascicles of synergistic muscles (MG and SOL) can behave differently during DJ, and that with increasing DH, there may be specific length change patterns of the fascicles of MG but not of SOL.




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