Abstract
This study was designed to determine the regional differences of magnetic resonance (MR) measurements in the hamstrings [biceps femoris muscle long head (BFl) and short head (BFs), semimembranosus muscle (SM), and semitendinosus muscle (ST)] following eccentric knee-flexion exercise. Twelve male volunteers performed eccentric knee-flexion exercise. Maximum isometric torque, plasma creatine kinase (CK) activity, muscle soreness, and MR images of the hamstrings were measured before and immediately following exercise, and on the first, second, third and seventh days following the exercise. Cross-sectional areas (CSAs) and transverse relaxation times (T2s) of the hamstrings were measured from the T2-weightened MR imaging sequences of 30% (proximal), 50% (middle), and 70% (distal) areas of the thigh length. The CSA of the ST at proximal and middle regions had significantly increased on the third day, but no significant changes were found for the BFl or SM. Immediately following exercise, T2 values had increased significantly in the BFs, BFl, and ST. On the third day, T2 values of only ST increased significantly at proximal, middle and distal regions. Significant differences of T2 values between proximal and distal regions in the ST were found for the second, third and seventh days following the exercise. These results suggest that because of the anatomical characteristics of the muscles, the degrees of response following the exercise differed among the muscles and the regions of ST muscle.
| Original language | English |
|---|---|
| Pages (from-to) | 713-720 |
| Number of pages | 8 |
| Journal | European Journal of Applied Physiology |
| Volume | 101 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 2007 Dec |
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Keywords
- Cross-sectional area
- Magnetic resonance imaging
- Region-specific difference
- Transverse relaxation time
ASJC Scopus subject areas
- Public Health, Environmental and Occupational Health
- Physiology
- Orthopedics and Sports Medicine
- Physical Therapy, Sports Therapy and Rehabilitation
Cite this
Non-uniform changes in magnetic resonance measurements of the semitendinosus muscle following intensive eccentric exercise. / Kubota, Jun; Ono, Takashi; Araki, Megumi; Torii, Suguru; Okuwaki, Toru; Fukubayashi, Toru.
In: European Journal of Applied Physiology, Vol. 101, No. 6, 12.2007, p. 713-720.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Non-uniform changes in magnetic resonance measurements of the semitendinosus muscle following intensive eccentric exercise
AU - Kubota, Jun
AU - Ono, Takashi
AU - Araki, Megumi
AU - Torii, Suguru
AU - Okuwaki, Toru
AU - Fukubayashi, Toru
PY - 2007/12
Y1 - 2007/12
N2 - This study was designed to determine the regional differences of magnetic resonance (MR) measurements in the hamstrings [biceps femoris muscle long head (BFl) and short head (BFs), semimembranosus muscle (SM), and semitendinosus muscle (ST)] following eccentric knee-flexion exercise. Twelve male volunteers performed eccentric knee-flexion exercise. Maximum isometric torque, plasma creatine kinase (CK) activity, muscle soreness, and MR images of the hamstrings were measured before and immediately following exercise, and on the first, second, third and seventh days following the exercise. Cross-sectional areas (CSAs) and transverse relaxation times (T2s) of the hamstrings were measured from the T2-weightened MR imaging sequences of 30% (proximal), 50% (middle), and 70% (distal) areas of the thigh length. The CSA of the ST at proximal and middle regions had significantly increased on the third day, but no significant changes were found for the BFl or SM. Immediately following exercise, T2 values had increased significantly in the BFs, BFl, and ST. On the third day, T2 values of only ST increased significantly at proximal, middle and distal regions. Significant differences of T2 values between proximal and distal regions in the ST were found for the second, third and seventh days following the exercise. These results suggest that because of the anatomical characteristics of the muscles, the degrees of response following the exercise differed among the muscles and the regions of ST muscle.
AB - This study was designed to determine the regional differences of magnetic resonance (MR) measurements in the hamstrings [biceps femoris muscle long head (BFl) and short head (BFs), semimembranosus muscle (SM), and semitendinosus muscle (ST)] following eccentric knee-flexion exercise. Twelve male volunteers performed eccentric knee-flexion exercise. Maximum isometric torque, plasma creatine kinase (CK) activity, muscle soreness, and MR images of the hamstrings were measured before and immediately following exercise, and on the first, second, third and seventh days following the exercise. Cross-sectional areas (CSAs) and transverse relaxation times (T2s) of the hamstrings were measured from the T2-weightened MR imaging sequences of 30% (proximal), 50% (middle), and 70% (distal) areas of the thigh length. The CSA of the ST at proximal and middle regions had significantly increased on the third day, but no significant changes were found for the BFl or SM. Immediately following exercise, T2 values had increased significantly in the BFs, BFl, and ST. On the third day, T2 values of only ST increased significantly at proximal, middle and distal regions. Significant differences of T2 values between proximal and distal regions in the ST were found for the second, third and seventh days following the exercise. These results suggest that because of the anatomical characteristics of the muscles, the degrees of response following the exercise differed among the muscles and the regions of ST muscle.
KW - Cross-sectional area
KW - Magnetic resonance imaging
KW - Region-specific difference
KW - Transverse relaxation time
UR - http://www.scopus.com/inward/record.url?scp=35348999684&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=35348999684&partnerID=8YFLogxK
U2 - 10.1007/s00421-007-0549-x
DO - 10.1007/s00421-007-0549-x
M3 - Article
C2 - 17724609
AN - SCOPUS:35348999684
VL - 101
SP - 713
EP - 720
JO - European Journal of Applied Physiology
JF - European Journal of Applied Physiology
SN - 1439-6319
IS - 6
ER -