scholarly journals The relationship between the mean muscle fibre area and the muscle cross-sectional area of the thigh in subjects with large differences in thigh girth

1981 ◽  
Vol 113 (4) ◽  
pp. 537-539 ◽  
Author(s):  
P. SCHANTZ ◽  
E. RANDALL FOX ◽  
P. NORGREN ◽  
A. TYDÉN
Keyword(s):  
Muscle Fibre ◽  
Cross Sectional Area ◽  
Sectional Area ◽  
Cross Sectional ◽  
Fibre Area ◽  
The Mean ◽  
Muscle Cross Sectional Area ◽  
The Relationship

The relationship between passive stiffness and muscle power output: Influence of muscle cross-sectional area normalization

2013 ◽  
Vol 49 (1) ◽  
pp. 69-75 ◽  
Author(s):  
Ty B. Palmer ◽  
Nathaniel D.M. Jenkins ◽  
Brennan J. Thompson ◽  
Douglas B. Smith ◽  
Joel T. Cramer
Keyword(s):  
Power Output ◽  
Muscle Power ◽  
Cross Sectional Area ◽  
Sectional Area ◽  
Passive Stiffness ◽  
Cross Sectional ◽  
Muscle Cross Sectional Area ◽  
The Relationship ◽  
Muscle Power Output

Adaptations in muscle fibre characteristics induced by physical activity in pigs

1998 ◽  
Vol 66 (3) ◽  
pp. 733-740 ◽  
Author(s):  
J. S. Petersen ◽  
P. Henckel ◽  
N. Oksbjerg ◽  
M. T. Sørensen
Keyword(s):  
Physical Activity ◽  
Spontaneous Activity ◽  
Muscle Fibre ◽  
Cross Sectional Area ◽  
Muscle Fibre Types ◽  
Sectional Area ◽  
Cross Sectional ◽  
Individual Housing ◽  
The Mean ◽  
Fast Twitch

AbstractThe influence of regular exercise training and physical activity on distribution of muscle fibre types, fibre cross-sectional areas and the number of adjacent capillaries per fibre type and per fibre (capillarization) was studied in five muscles from 48 female and 48 entire male pigs. In the growth interval from 30 to 100 kg, the pigs were subjected to one of three treatments: individual housing in pens of 2·5 m2 (treatment C), individual housing and treadmill training for 15 minlday at a speed of 4 kmlh, 5 days/week for a period of 70 days (treatment T), and housing in large pens (36 m2, 40 pigs per pen) allowing for spontaneous physical activity (treatment F). In m. longissimus dorsi, treatment F increased the ratio of fast-twitch oxidative (FTa-) to fast twitch glycolytic (FTb-) fibres, elevated the mean fibre cross-sectional area and the number of capillaries per fibre. In m. biceps femoris (BF) from female pigs, the only adaptation found was a marked training-induced (treatment T) increase in the cross-sectional area of the slow-twitch (ST-) fibres. In m. semitendinosus and BF from male pigs, treatments T and F increased the ratio of FTa- to FTb-fibres. Both training and spontaneous activity increased the proportion of ST-fibres in m. trapezius thoracis (0·48 in treatment C, 0·53 in T and 0·52 in F). Conversely in m. psoas major, treatment F increased the proportion of FTa-fibres (0·15 in C and 0·19 in F) at the expense of ST- and intermediate FTc-fibres. Spontaneous activity induced ST-fibre hypertrophy in the five muscles. For several muscles, the mean fibre cross-sectional area was significantly higher in female than in male pigs.

Gender- and height-related limits of muscle strength in world weightlifting champions

2000 ◽  
Vol 89 (3) ◽  
pp. 1061-1064 ◽  
Author(s):  
Lincoln E. Ford ◽  
Alvin J. Detterline ◽  
Kevin K. Ho ◽  
Wenyuan Cao
Keyword(s):  
Muscle Strength ◽  
Body Mass ◽  
Common Factor ◽  
Body Height ◽  
Cross Sectional Area ◽  
Sectional Area ◽  
Cross Sectional ◽  
Muscle Cross Sectional Area ◽  
The Relationship ◽  
Contractile Tissue

To assess factors that limit human muscle strength and growth, we examined the relationship between performance and body dimensions in the world weightlifting champions of 1993–1997. Weight lifted varied almost exactly with height squared (Ht2.16), suggesting that muscle mass scaled almost exactly with height cubed (Ht3.16) and that muscle cross-sectional area was closely correlated with body height, possibly because height and the numbers of muscle fibers in cross section are determined by a common factor during maturation. Further height limitations of muscle strength were shown by only one male champion ≥183 cm and no female champions ≥175 cm. The ratio of weight lifted to mean body cross-sectional area was approximately constant for body-weight classes ≤83 kg for men and ≤64 kg for women and decreased abruptly for higher weight classes. These findings suggest a nearly constant fraction of body mass devoted to muscle in lighter lifters and a lesser fraction in heavier lifters. Analysis also suggests that contractile tissue comprises ∼30% less body mass in female champions.

scholarly journals Is there a correlation between upper lumbar disc herniation and multifidus muscle degeneration? A retrospective study of MRI morphology

2021 ◽  
Vol 22 (1) ◽  
Author(s):  
Chong Liu ◽  
Jiang Xue ◽  
Jingjing Liu ◽  
Gang Ma ◽  
Abu Moro ◽  
...  
Keyword(s):  
Lumbar Disc Herniation ◽  
Lumbar Disc ◽  
Fatty Infiltration ◽  
Cross Sectional Area ◽  
Sectional Area ◽  
Muscle Degeneration ◽  
Multifidus Muscle ◽  
Cross Sectional ◽  
Upper Lumbar Disc Herniation ◽  
Muscle Cross Sectional Area

Abstract Background The purpose of the study is to investigate the correlation between upper lumbar disc herniation (ULDH) and multifidus muscle degeneration via the comparison of width, the cross-sectional area and degree of fatty infiltration of the lumbar multifidus muscle. Methods Using the axial T2-weighted images of magnetic resonance imaging as an assessment tool, we retrospectively investigated 132 patients with ULDH and 132 healthy individuals. The total muscle cross-sectional area (TMCSA) and the pure muscle cross-sectional area (PMCSA) of the multifidus muscle at the L1/2, L2/3, and L3/4 intervertebral disc levels were measured respectively, and in the meantime, the average multifidus muscle width (AMMW) and degree of fatty infiltration of bilateral multifidus muscle were evaluated. The resulting data were analyzed to determine the presence/absence of statistical significance between the study and control groups. Multivariate logistical regression analyses were used to evaluate the correlation between ULDH and multifidus degeneration. Results The results of the analysis of the two groups showed that there were statistically significant differences (p < 0.05) between TMCSA, PMCSA, AMMW and degree of fatty infiltration. The multivariate logistic regression analysis indicated that the TMCSA, PMCSA, AMMW and the degree of fatty infiltration of multifidus muscle were correlated with ULDH, and the differences were statistically significant (P < 0.05). Conclusions A correlation could exist between multifidus muscles degeneration and ULDH, that may be a process of mutual influence and interaction. Lumbar muscle strengthening training could prevent and improve muscle atrophy and degeneration.

Sign in / Sign up

Export Citation Format

Share Document