17th Annual ECSS-Congress, Bruges 2012

Abstract details

Abstract-ID: 1496
Session: [E-POS] E-Poster
Lecture room: E-Poster screens
Date & time: 24.06.2015 / -
Authors: Hiratsuka, K.1, Miyazaki, D.1, Shimojyu, S.1, Okada, M.1, Simunic, B.2, Djordjevics, S.2, Tsunoda, N.3
Institution: 1: Kokushikan University (Tokyo, Japan) 2: University of Primorska (Koper, Slovenia) 3: Graduate of sport system, Kokushikan University (Tokyo, Japan)
Department: Physical Education
Country: Japan
Abstract text Introduction It is well known that structural and functional characteristics of the lower limb muscle was affected by specific training mode. Especially, in muscle fiber properties, sprinter has exceed fast twitch fibers, muscle contraction velocity of sprinter was higher than long distance runners. However, contractile property and size of the belly in thigh muscle were not cleared. Therefore, the purpose of this study was to clarify the muscle structure and contractile properties of the thigh muscle in sprinters and long distance runners. Methods Subjects were 20 sprinters (SP; aged20.31.9yrs, height171.44.8cm and weight62.85.4kg), 14 long distance runners (LDR; aged19.61.0yrs, height170.74.6cm and weight55.73.8kg) and 9 collegiate students of physical education (CON; aged20.71.3yrs, height176.53.7cm and weight72.613.5kg ) as control group. Muscle belly in Rectus femoris (RF), Vastus medialis (VM), Vastus lateralis (VL) and Biceps femoris (BF) were measured by ultrasonic scanning method. Contractile response of the muscle belly was recorded by TMG method. The displacement sensor was positions at the surface of the belly in each muscles. Single twitch stimuli with two surface electrodes were used to obtain the dynamic response. Three contractile parameters of delay time (Td), contraction time (Tc) and maximal displacement of the muscle belly (Dm) were analyzed by TMG method. Results Muscle thickness of RF, VM and VL were not significant difference among the groups. Whereas, Thickness of the BF in LDR showed significant lower values that SP and CON groups. In SP, the Td of the muscle belly twitch response of RF (22.92.6ms),VM (19.71.7ms) and BF (22.12.0ms) were significant lower than that of LDR and CON groups. Td of LDR was observed highest values in VL (22.61.9ms). Tc value of RF in SP (25.34.9ms) was lower than that of LDR (29.43.2ms). Also, same tendency was observed in VM (21.82.8ms) and BF (27.610.4ms). Dm of muscle belly of each muscles were not differed among the groups. Discussion In this study, it is cleared that muscle thickness as a structural characteristics was significant differed between SP and LDR in BF. Whereas, Td and Tc as a contractile properties of muscle belly except for VL in thigh were significant shorter in SP than other groups. From these results, it was considered that contraction parameters using TMG method may evaluate the muscle contractile properties due to athletic training modes. Reference Dahmane R, Djordjevics S, Smerdu V. (2006). Med Bio Eng Comput, 44(11), 999-1006. Valencic V, Knez N. (1997). Artificial Organs, 21(3), 204-242.
Topic: Biomechanics
Keyword I: contractile properties
Keyword II: sprinters
Keyword III: long distance runners