Effects of jump training on passive mechanical stress and stiffness in rabbit skeletal muscle: role of collagen

Ducomps, Christophe; Mauriège, Pascale; Darche, B.; Combes, Sylvie; Lebas, François; Doutreloux, Jean-Paul

doi:10.1046/j.1365-201x.2003.01109.x

Cited by 63 publications

(67 citation statements)

References 37 publications

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“…The greater redness index of meat in rabbits reared in large pen compared to those reared in small pen and caged rabbits can be attributed to enhance of locomotory behaviour. Indeed, it has been shown previously that physical activity increased oxidative energy metabolism and enhanced the proportion of type I and of type IIA fibres rich in mitochondria and myoglobin when compared to sedentary animals (Ducomps et al, 2003;Gondret et al, 2009). As observed in the PCA plot (Figure 1) in our experiment, increased redness was related to low ultimate pH in LL and in BF.…”

Section: Discussionsupporting

confidence: 68%

Influence of cage or pen housing on carcass traits and meat quality of rabbit

Combes

Postollec²,

Cauquil

et al. 2010

Animal

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at a similar stock density of 15 rabbits/m 2 were compared (n 5 30 per group). Pens contained an elevated platform. Slaughter weight (SW; P , 0.01) and cold carcass weight ( P , 0.05) decreased in the order of Cage , Small pen , Large pen groups. SW and cold carcass weight were 7% lower in rabbits housed in large pens than in cages. Dressing out and meat-to-bone ratio were not influenced by the housing system. Percentage of fat deposits was highest in caged rabbits (10.15 point for scapular fat and 10.26 point for perirenal fat compared to rabbits reared in large pens P , 0.05). Rabbits housed in large pens had a bigger proportion of hind part (11 point), and meat colour was shifted towards greater a* values ( P , 0.01) compared to caged rabbits. Water holding capacity and shear test parameters in longissimus lumborum muscle, lipid content and shear test parameters of abductor cruralis cranialis, biceps femoris and semitendinosus muscles were not affected by the housing system. Tibia and femur bone moment of inertia increased in the order of Cage , Small pen , Large pen groups ( P , 0.05), whereas elastic modulus, which is a measure of intrinsic stiffness, was highest in caged rabbits. This study showed that large pen housing altered carcass traits independently and increased meat redness and fracture resistance of tibia and femur.Keywords: rabbits, housing conditions, meat quality, carcass quality ImplicationsThis manuscript aims to describe the effect of alternative housing conditions on rabbit carcass and meat quality with emphasis on enhancing exercise. Using a wide range of physico-chemical measurements and a principal component analysis, this paper provides new information and insight on the relationships between meat and carcass traits as affected by housing conditions: carcass parameters, meat colour and bone properties are affected independently. It demonstrates that rearing rabbits in large pens could be an alternative housing system, which would satisfy consumer demand for 'ethical qualities' of meat, but probably without perception of higher sensorial quality.

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Section: Discussionsupporting

confidence: 68%

Influence of cage or pen housing on carcass traits and meat quality of rabbit

Combes

Postollec²,

Cauquil

et al. 2010

Animal

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“…MacDougall et al 21) have shown that the proportion of intramuscular connective tissue in the biceps brachii did not differ between bodybuilders and control subjects. In contrast, Ducompus et al 9) have shown in rabbits that highintensity exercise training induced a significant increase in intramuscular collagen concentration in the extensor digitorum longus and rectus femoris, but not in the semimembranosus proprius. Taken together, it is likely that the effects of training and its associated muscle CSA on the proportion of connective tissue are dependent on the muscles examined.…”

Section: Discussionmentioning

confidence: 93%

“…Such compositional variabilities can modulate the passive material properties of muscle. Additionally, a previous study has shown in rabbits that high-intensity exercise training induced a significant increase in intramuscular collagen concentration 9) , leading to an increase in the passive material properties of a muscle, since the passive material properties of a muscle can be influenced by the collagenous connective tissues within the muscle 10,11) . Thus, it is reasonable to assume that the passive material properties of muscle differ among individuals, and that muscle with greater CSA (i.e., hypertrophied muscle) is stiffer.…”

Section: Introductionmentioning

confidence: 99%

No association between passive material property and cross-sectional area in human hamstring

Hirata

Miyamoto‐Mikami

Kimura

et al. 2017

JPFSM

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The passive material properties of a muscle, as evaluated by shear or Young's modulus, can vary depending on the muscle cross-sectional area (CSA), since intramuscular compositions such as adipose tissue and connective tissue change with muscle hypertrophy and atrophy. However, the relationship remains unclear between the passive material properties and CSA of a muscle. Therefore, we examined whether passive muscle shear modulus is related to muscle CSA in the human hamstring. The shear modulus and anatomical CSA of the biceps femoris, semitendinosus, and semimembranosus were measured in 71 healthy young males with the hip flexed at 70° and knee fully extended. The shear modulus of each muscle was measured using ultrasound shear wave elastography. Muscle CSA was assessed using panoramic ultrasound imaging. There were individual differences in muscle shear modulus as well as muscle CSA. The coefficients of variation (CVs) of muscle shear modulus were 41.4% (range: 8.8 -54.3 kPa), 33.0% (range: 8.4 -57.3 kPa), and 41.1% (range: 18.2 -107.1 kPa) for the biceps femoris, semitendinosus, and semimembranosus, respectively. There were no significant correlations between shear modulus and CSA in each or overall hamstring muscle (absolute r < 0.113). The present findings indicate that, although the passive material property of muscle is not the same among individuals, it is substantially independent of the muscle CSA, at least in the hamstring.

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“…The EMD changes during training are mainly attributed to changes in the tendon structure, but it should be noted that tendon stiffness is always increased during any physical activity, both during endurance (Buchanan and Marsh 2001) and isometric training (Kubo et al 2000. Furthermore, EMD changes correlate very closely with muscle MTC and especially with the active SEC fraction during training (Pousson et al 1991;Ducomps et al 2003, Malisoux et al 2006.…”

Section: Influence Of Simulated Microgravity On Mechanical Propertiesmentioning

confidence: 99%

“…Endurance training resulted in an increase in the SEC stiffness in the soleus muscle of rats, associated with an increase in type I fibres (Goubel and Marini 1987). Both jump and endurance training also appear to increase both collagen concentration (Kovanen et al 1980;Ducomps et al 2003) and muscle passive stiffness. The soleus rat muscles submitted to plyometric training had more fast twitch fibres and a lower SEC stiffness than controls (Watt et al 1982;Pousson et al 1991;Almeida-Silveira et al 1994).…”

Section: Influence Of Simulated Microgravity On Mechanical Propertiesmentioning

confidence: 99%

Influence of Simulated Microgravity on Mechanical Properties in the Human Triceps Surae Muscle in vivo

Koryak

2015

Central European Journal of Sport Sciences and Medicine

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Abstract. Purpose. The aim of the study was to investigate the effects of a simulated microgravity on the mechanical properties of the human triceps surae (TS) and to assess the effectiveness of physical training (PT) in preventing detrimental effects. Methods. Eight women (aged 26-36 years) underwent 120-d of Bed rest (BR): four underwent Bed rest only (BR group) and four performed PT during this period (BRPT group). The training sessions were conducted for 60 min each day for 6 days a week for 14 weeks, and 30-40 min twice a day for 2 weeks under the experiment conditions. PT was performed over a 4-d cycle: 3-d of training and 1-d of rest. The maximal voluntary contraction (MVC), and isometric twitch contraction (P t ), and electrically evoked tetanic tension at 150 impulses × s -1 (Р о ), time-to-peak tension (TPT) of the twitch were determined. The difference between Р о and MVC expressed as a percentage of Р о and referred to a force deficiency (Р d ). The MTS was determined according to the electromechanical delay (EMD) value during the explosive voluntary contraction. Surface electrodes sensed electromyographic (EMG) activity in the soleus muscle. Electromechanical delay (EMD) was the time interval between the change in EMG and movement muscle force production. Results. In the BR group, Р t , MVC, and Р о had decreased by 12, 36, 24%, respectively, but Р d had increased by 39%. TPT of the twitch had increased by 14%. The rate of increase of voluntary contractions reduced, but in the electrically evoked contraction no changes were observed. The EMD had increased by 27%. In the BREx group, МVС, Р t , and Р о decreased by 3%, and 14%, and 9%, respectively. TPT had decreased by 4%. The P d had decreased significantly by 10%. The rate of rise increase of electrically evoked tetanic did not change significantly, but the rate of rise in isometric voluntary tension development was increased. The EMD had decreased by 12%. Conclusion. Unloading decreased function and EMD muscle and, although the PT did attenuate these effects, they did not completely prevent them. It is suggested that the total loading volume (mainly its intensity) was not sufficient to completely prevent alterations in tendon mechanical properties

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Effects of jump training on passive mechanical stress and stiffness in rabbit skeletal muscle: role of collagen

Cited by 63 publications

References 37 publications

Influence of cage or pen housing on carcass traits and meat quality of rabbit

Influence of cage or pen housing on carcass traits and meat quality of rabbit

No association between passive material property and cross-sectional area in human hamstring

Influence of Simulated Microgravity on Mechanical Properties in the Human Triceps Surae Muscle in vivo

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