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

Author(s):  
Dona J. Housh ◽  
Terry J. Housh ◽  
Joseph P Weir ◽  
Loree L. Weir ◽  
Tammy K. Evetovich ◽  
...  
1998 ◽  
Vol 12 (3) ◽  
pp. 185-191 ◽  
Author(s):  
Dona J. Housh ◽  
Terry J. Housh ◽  
Joseph P. Weir ◽  
Loree L. Weir ◽  
Tammy K. Evetovich ◽  
...  

1998 ◽  
Vol 12 (3) ◽  
pp. 192-198
Author(s):  
Dona J. Housh ◽  
Terry J. Housh ◽  
Joseph P. Weir ◽  
Loree L. Weir ◽  
Tammy K. Evetovich ◽  
...  

1996 ◽  
Vol 6 (2) ◽  
pp. 101-108 ◽  
Author(s):  
Dona J. Housh ◽  
Terry J. Housh ◽  
Joseph P. Weir ◽  
Loree L. Weir ◽  
Patrick E. Donlin ◽  
...  

1994 ◽  
Vol 26 (Supplement) ◽  
pp. S31
Author(s):  
D. J. Housh ◽  
TJ. Housh ◽  
J. P. Weir ◽  
L. L Weir ◽  
G. O. Johnson

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Adrien J. Létocart ◽  
Franck Mabesoone ◽  
Fabrice Charleux ◽  
Christian Couppé ◽  
René B. Svensson ◽  
...  

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.


2015 ◽  
Vol 116 (1) ◽  
pp. 49-56 ◽  
Author(s):  
Felipe Damas ◽  
Stuart M. Phillips ◽  
Manoel E. Lixandrão ◽  
Felipe C. Vechin ◽  
Cleiton A. Libardi ◽  
...  

2015 ◽  
Vol 84 (3) ◽  
pp. 297-303
Author(s):  
Milena Fantová ◽  
Martin Ptáček ◽  
Klára Michnová ◽  
Lenka Nohejlová ◽  
Jaromír Ducháček

Histochemical characteristics of muscle were evaluated in 12 German Heath lambs (6 males and 6 females). The lambs were slaughtered at the age of 150 days and samples of musculus longissimus lumborum et thoracis and quadriceps femoris were collected and measurements of fibre cross sectional area (µm2), diameter (µm2), and perimeter (µm2) were performed. Subsequently the fibre type distribution (%) was calculated. The dataset was evaluated using SAS 9.3. Significantly higher (P < 0.05) cross sectional area, diameter, and perimeter attributes were observed in females compared to males. Significant differences (P < 0.05 to 0.01) were observed in fibre type distribution between musculus longissimus lumborum et thoracis and quadriceps femoris muscle. The presented study describes evaluation of morphological formation of skeletal muscle tissue performed on a sheep breed of German origin. The results may be useful for meat scientists or meat industry due to close connection of these characteristics to meat quality.


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