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Differences In Skeletal Muscle Contractile Properties Among Power And Endurance Elite Athletes

Differences In Skeletal Muscle Contractile Properties Among Power And Endurance Elite Athletes

Author Block: Irineu Loturco1, Hamilton Roschel2, Carlos Ugrinowitsch2, Cristiano Laurino 3, Saulo Gil1, Ronaldo Kobal1, Valmor Tricoli2. 1Pão de Açúcar Group - Nucleus of High Performance in Sports, São Paulo, Brazil. 2University of São Paulo, São Paulo, Brazil. 3BM&F - Bovespa Track & Field Club, São Paulo, Brazil.

Measurements of muscle belly responses to electrical stimuli using a displacement sensor provide valuable information about the skeletal muscle contractile properties. In this regard, it has been proposed that muscle contraction time (Tc) could be used as an accurate non-invasive predictor of fiber type composition. Additionally, the muscle radial displacement (Dm) is considered as a reliable measurement of muscle stiffness. Thus, it is conceivable that power and endurance elite athletes present significant differences between these skeletal muscle mechanical properties. PURPOSE: The purpose of this study was to evaluate if there are significant differences in muscle contractile properties among power and endurance elite athletes. METHODS: Thirty-four elite male track and field athletes were divided into two different groups: power athletes (PA) (sprinters and jumpers; n=18; age: 26 ± 3, 8 years; height: 179 ± 6, 8 cm; weight: 77, 8 ± 8, 2kg) and endurance athletes (EA) (endurance runners and triathletes; n=16; 26, 4 ± 7, 2 years; height: 168 ± 9, 2 cm; weight: 61 ± 12, 2 kg). Dm and Tc were measured in both the rectus femoris (RF) and the biceps femoris (BF) muscles from the dominant leg, using a Tensiomyographer device (TMG Measurement System, TMG-BMC Ltd., Ljubljana, Slovenia). Unpaired t-tests were used to compare the differences between the groups. Statistical significance was set at P :

Author Disclosure Information: I. Loturco: None.
Category (Complete): 103. Fitness Assessment, Exercise Training, and Performance of Athletes and Healthy People - Sport Science
Keyword (Complete): skeletal muscle ; contraction time ; tensiomyography
Unlabeled/ Investigational Products (Complete):

: No
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06/05/13 Oasis, The Online Abstract Submission System

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Control/Tracking Number: 13-SA-3625-ACSM Activity: Scientific Abstract
Current Date/Time: 5/6/2013 3:24:59 PM 

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