175 THE EFFECT OF CONCENTRIC RESISTANCE TRAINING ON THE CROSS-SECTIONAL AREA OF THE QUADRICEPS FEMORIS

1994 ◽  
Vol 26 (Supplement) ◽  
pp. S31
Author(s):  
D. J. Housh ◽  
TJ. Housh ◽  
J. P. Weir ◽  
L. L Weir ◽  
G. O. Johnson
Keyword(s):  
Resistance Training ◽  
Quadriceps Femoris ◽  
Cross Sectional Area ◽  
Sectional Area ◽  
Cross Sectional ◽  
The Cross

scholarly journals Effects of high- and low-velocity resistance training on the contractile properties of skeletal muscle fibers from young and older humans

2011 ◽  
Vol 111 (4) ◽  
pp. 1021-1030 ◽  
Author(s):  
Dennis R. Claflin ◽  
Lisa M. Larkin ◽  
Paul S. Cederna ◽  
Jeffrey F. Horowitz ◽  
Neil B. Alexander ◽  
...  
Keyword(s):  
Skeletal Muscle ◽  
Resistance Training ◽  
Cross Sectional Area ◽  
Contractile Properties ◽  
Sectional Area ◽  
Low Velocity ◽  
Cross Sectional ◽  
Men And Women ◽  
The Cross

A two-arm, prospective, randomized, controlled trial study was conducted to investigate the effects of movement velocity during progressive resistance training (PRT) on the size and contractile properties of individual fibers from human vastus lateralis muscles. The effects of age and sex were examined by a design that included 63 subjects organized into four groups: young (20–30 yr) men and women, and older (65–80 yr) men and women. In each group, one-half of the subjects underwent a traditional PRT protocol that involved shortening contractions at low velocities against high loads, while the other half performed a modified PRT protocol that involved contractions at 3.5 times higher velocity against reduced loads. Muscles were sampled by needle biopsy before and after the 14-wk PRT program, and functional tests were performed on permeabilized individual fiber segments isolated from the biopsies. We tested the hypothesis that, compared with low-velocity PRT, high-velocity PRT results in a greater increase in the cross-sectional area, force, and power of type 2 fibers. Both types of PRT increased the cross-sectional area, force, and power of type 2 fibers by 8–12%, independent of the sex or age of the subject. Contrary to our hypothesis, the velocity at which the PRT was performed did not affect the fiber-level outcomes substantially. We conclude that, compared with low-velocity PRT, resistance training performed at velocities up to 3.5 times higher against reduced loads is equally effective for eliciting an adaptive response in type 2 fibers from human skeletal muscle.

Effects of Unilateral Concentric-Only Dynamic Constant External Resistance Training on Quadriceps Femoris Cross-Sectional Area

1998 ◽  
Vol 12 (3) ◽  
pp. 185-191 ◽  
Author(s):  
Dona J. Housh ◽  
Terry J. Housh ◽  
Joseph P. Weir ◽  
Loree L. Weir ◽  
Tammy K. Evetovich ◽  
...  
Keyword(s):  
Resistance Training ◽  
Quadriceps Femoris ◽  
Cross Sectional Area ◽  
Sectional Area ◽  
External Resistance ◽  
Cross Sectional

Concentric isokinetic resistance training and quadriceps femoris cross-sectional area

1996 ◽  
Vol 6 (2) ◽  
pp. 101-108 ◽  
Author(s):  
Dona J. Housh ◽  
Terry J. Housh ◽  
Joseph P. Weir ◽  
Loree L. Weir ◽  
Patrick E. Donlin ◽  
...  
Keyword(s):  
Resistance Training ◽  
Quadriceps Femoris ◽  
Cross Sectional Area ◽  
Sectional Area ◽  
Cross Sectional

Effects of Unilateral Eccentric-Only Dynamic Constant External Resistance Training on Quadriceps Femoris Cross-Sectional Area

1998 ◽  
Vol 12 (3) ◽  
pp. 192-198
Author(s):  
Dona J. Housh ◽  
Terry J. Housh ◽  
Joseph P. Weir ◽  
Loree L. Weir ◽  
Tammy K. Evetovich ◽  
...  
Keyword(s):  
Resistance Training ◽  
Quadriceps Femoris ◽  
Cross Sectional Area ◽  
Sectional Area ◽  
External Resistance ◽  
Cross Sectional

scholarly journals Quadriceps femoris cross-sectional area and specific leg strength: relationship between different muscles and squat variations

PeerJ ◽  
2021 ◽  
Vol 9 ◽  
pp. e12435
Author(s):  
Filip Kojic ◽  
Saša Ðurić ◽  
Igor Ranisavljev ◽  
Stanimir Stojiljkovic ◽  
Vladimir Ilic
Keyword(s):  
Muscle Mass ◽  
External Load ◽  
Quadriceps Femoris ◽  
Cross Sectional Area ◽  
Sectional Area ◽  
Cross Sectional ◽  
Leg Muscle ◽  
The Cross ◽  
Deep Squat ◽  
Quadriceps Femoris Muscles

Background The aim was to determine the relationship between the cross-sectional area of the quadriceps femoris and strength performance in the deep and parallel barbell squat. Methods The sample included 16 university students (seven female, 24.1 ± 1.7 years). Muscle strength was expressed as external load, including the one-repetition maximum and the body mass segments involved (calculated according to Dempster’s method). The cross-sectional area of the quadriceps femoris muscles was determined using ultrasound, while leg muscle mass was measured using the Bioelectrical Impedance method. Results The cross-sectional areas of the three vastii muscles and leg muscle mass showed moderate to strong correlation with external load in both squat types (r = 0.509–0.873). However, partial correlation (cross-sectional area of quadriceps femoris muscles were controlled) showed significant association only between leg muscle mass and deep squat (r = 0.64, p < 0.05). The cross-sectional area of the vastus lateralis showed a slightly higher correlation with external load in the parallel than in the deep squat (r = 0.67, p < 0.01 vs. r = 0.59, p < 0.05). The regression analysis extracted the vastus medialis cross-sectional area as the most important factor in manifesting strength (parallel squat: R2 = 0.569; deep squat: R2 = 0.499, both p < 0.01). The obtained results suggest that parallel squat strength depends mainly on the cross-sectional area of the vastii muscles, while it seems that the performance in the deep squat requires an additional engagement of the hip and back extensor muscle groups.

scholarly journals Muscles adaptation to aging and training: architectural changes – a randomised trial

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Adrien J. Létocart ◽  
Franck Mabesoone ◽  
Fabrice Charleux ◽  
Christian Couppé ◽  
René B. Svensson ◽  
...  
Keyword(s):  
Resistance Training ◽  
Young Men ◽  
Cross Sectional Area ◽  
Muscle Volume ◽  
Triceps Surae ◽  
Moderate Intensity ◽  
Training Volume ◽  
Sectional Area ◽  
Cross Sectional ◽  
Repetition Maximum

Abstract Background To investigate how anatomical cross-sectional area and volume of quadriceps and triceps surae muscles were affected by ageing, and by resistance training in older and younger men, in vivo. Methods The old participants were randomly assigned to moderate (O55, n = 13) or high-load (O80, n = 14) resistance training intervention (12 weeks; 3 times/week) corresponding to 55% or 80% of one repetition maximum, respectively. Young men (Y55, n = 11) were assigned to the moderate-intensity strengthening exercise program. Each group received the exact same training volume on triceps surae and quadriceps group (Reps x Sets x Intensity). The fitting polynomial regression equations for each of anatomical cross-sectional area-muscle length curves were used to calculate muscle volume (contractile content) before and after 12 weeks using magnetic resonance imaging scans. Results Only Rectus femoris and medial gastrocnemius muscle showed a higher relative anatomical cross-sectional area in the young than the elderly on the proximal end. The old group displayed a higher absolute volume of non-contractile material than young men in triceps surae (+ 96%). After training, Y55, O55 and O80 showed an increase in total quadriceps (+ 4.3%; + 6.7%; 4.2% respectively) and triceps surae (+ 2.8%; + 7.5%; 4.3% respectively) volume. O55 demonstrated a greater increase on average gains compared to Y55, while no difference between O55 and O80 was observed. Conclusions Muscle loss with aging is region-specific for some muscles and uniform for others. Equivalent strength training volume at moderate or high intensities increased muscle volume with no differences in muscle volume gains for old men. These data suggest that physical exercise at moderate intensity (55 to 60% of one repetition maximum) can reverse the aging related loss of muscle mass. Trial registration NCT03079180 in ClinicalTrials.gov. Registration date: March 14, 2017.

scholarly journals Atrophy patterns in isolated subscapularis lesions

2021 ◽  
Vol 22 (1) ◽  
Author(s):  
Gernot Seppel ◽  
Andreas Voss ◽  
Daniel J. H. Henderson ◽  
Simone Waldt ◽  
Bernhard Haller ◽  
...  
Keyword(s):  
Muscle Atrophy ◽  
Area Ratio ◽  
Cross Sectional Area ◽  
Control Group ◽  
Sectional Area ◽  
Cross Sectional ◽  
Subscapularis Muscle ◽  
Mri Scans ◽  
The Mean ◽  
The Cross

Abstract Background While supraspinatus atrophy can be described according to the system of Zanetti or Thomazeau there is still a lack of characterization of isolated subscapularis muscle atrophy. The aim of this study was to describe patterns of muscle atrophy following repair of isolated subscapularis (SSC) tendon. Methods Forty-nine control shoulder MRI scans, without rotator cuff pathology, atrophy or fatty infiltration, were prospectively evaluated and subscapularis diameters as well as cross sectional areas (complete and upper half) were assessed in a standardized oblique sagittal plane. Calculation of the ratio between the upper half of the cross sectional area (CSA) and the total CSA was performed. Eleven MRI scans of patients with subscapularis atrophy following isolated subscapularis tendon tears were analysed and cross sectional area ratio (upper half /total) determined. To guarantee reliable measurement of the CSA and its ratio, bony landmarks were also defined. All parameters were statistically compared for inter-rater reliability, reproducibility and capacity to quantify subscapularis atrophy. Results The mean age in the control group was 49.7 years (± 15.0). The mean cross sectional area (CSA) was 2367.0 mm2 (± 741.4) for the complete subscapularis muscle and 1048.2 mm2 (± 313.3) for the upper half, giving a mean ratio of 0.446 (± 0.046). In the subscapularis repair group the mean age was 56.7 years (± 9.3). With a mean cross sectional area of 1554.7 mm2 (± 419.9) for the complete and of 422.9 mm2 (± 173.6) for the upper half of the subscapularis muscle, giving a mean CSA ratio of 0.269 (± 0.065) which was seen to be significantly lower than that of the control group (p < 0.05). Conclusion Analysis of typical atrophy patterns of the subscapularis muscle demonstrates that the CSA ratio represents a reliable and reproducible assessment tool in quantifying subscapularis atrophy. We propose the classification of subscapularis atrophy as Stage I (mild atrophy) in case of reduction of the cross sectional area ratio < 0.4, Stage II (moderate atrophy) in case of < 0.35 and Stage III (severe atrophy) if < 0.3.

Sign in / Sign up

Export Citation Format

Share Document