Architectural and mechanical properties of the rat adductor longus: Response to weight-lifting training

Roy, Roland R.; Wilson, Roberta; Edgerton, V. Reggie

doi:10.1002/(sici)1097-0185(199702)247:2<170::aid-ar3>3.0.co;2-1

Cited by 32 publications

(27 citation statements)

References 34 publications

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“…Several types of motor unit fiber layout have been demonstrated within the series-fibered muscle belly (Trotter et al, 1995). Intriguingly, no one has yet described a motor unit made up of fibers aligned in series along the length of the muscle (Bodine et al, 1988;Lev-Tov et al, 1988;Bodine-Fowler et al, 1990;Ounjian et al, 1991;Eldred et al, 1993a;Smits et al, 1994;Roy et al, 1995Roy et al, , 1997Trotter et al, 1995). In support of this, our slow myosin wholemount immunostains show many examples of slow MHC-containing fibers that end midbelly in regions containing no other fibers of the same MHC profile (Fig.…”

Section: Discussionmentioning

confidence: 52%

Examination of intrafascicular muscle fiber terminations: Implications for tension delivery in series-fibered muscles

et al. 2000

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Section: Discussionmentioning

confidence: 52%

Examination of intrafascicular muscle fiber terminations: Implications for tension delivery in series-fibered muscles

et al. 2000

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“…Histologically, these pathological fiber changes bear a resemblance to those seen in muscular dystrophy and neurogenic atrophy or after strenuous muscle activity and all of these changes could be classified as degenerative (Silbermann et al, 1983; Kannus et al, 1998a, b). Longitudinal fiber splitting has been suggested as the mechanism responsible for strength training in animals (Roy et al, 1997). However, it is entirely unknown if some forms of these fibers can recover during the period of remobilization, and if so, to what extent.…”

Section: Discussionmentioning

confidence: 99%

Different frequency treadmill running in immobilization‐induced muscle atrophy and ankle joint contracture of rats

Sakakima

Yoshida

Sakae

et al. 2004

Scandinavian Med Sci Sports

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We investigated the effects of different frequencies of treadmill running on immobilization-induced soleus and gastrocnemius muscle atrophy and ankle joint contracture in rats using morphology and histochemistry. The right ankle joint of rat was immobilized for 2 weeks. Thereafter, the rats were randomly assigned to four groups for 6 weeks of exercise under different conditions: free cage activity and free remobilization (FR), once-a-week treadmill running (lowfrequency running program (LFR)), three-time-a-week running (middle-frequency running program (MFR)), and six-time-a-week running (high-frequency running program (HFR)) groups. Two weeks of immobilization significantly reduced the cross-sectional area of soleus type I (62%, Po0.05) and type II muscle fibers (66%, Po0.05), gastrocnemius type I (78%, Po0.05) and type II muscle fibers (68%, Po0.05), and the range of ankle joint movement (46%, Po0.05). Immobilization also increased the ratio of type II to total fiber numbers in the soleus (Po0.05), and gastrocnemius (Po0.05), and induced pathological changes in muscle fibers. Some of these changes could not be corrected by free remobilization; however, the LFR, MFR, and HFR groups clearly recovered toward normal levels with exercise frequency, the effect on muscle recovery being more beneficial in the MFR and HFR groups. In addition, the range of ankle joint contracture was improved in LFR, MFR, and HFR groups in comparison with that in the FR group. These findings indicate that treadmill running exercise improved the immobilization-induced muscle fiber histochemical alterations and the range of the ankle motion in rats. Running three times and six times a week was more beneficial for recovery of immobilization-induced muscle atrophy and joint contracture compared with no running or once-a-week running.

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“…These two factors are thought to account for the postnatal increase in total muscle mass [33]. This is also the case in "muscle fiber hypertrophy", such as that occurring after heavy resistance exercise [34][35][36][37][38][39] or in the compensatory enlarged muscle [40][41][42]. Therefore, satellite cells are considered "myoblast precursors" mainly working in the myofiber basal lamina cylinder.…”

Section: Primary Role Of Satellite Cellsmentioning

confidence: 99%

Plasticity and Physiological Role of Stem Cells Derived from Skeletal Muscle Interstitium: Contribution to Muscle Fiber Hyperplasia and Therapeutic Use

Tamaki

Uchiyama²,

Akatsuka³

2010

CPD

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Stem cells other than satellite cells that can give rise to primary myoblasts, which are able to form additional new fibers postnatally, are present in the interstitial spaces of skeletal muscle. These cells are sorted into CD34(+)/45(-) (Sk-34) and CD34(-)/45(-) (Sk-DN) cell fractions, and they are wholly (>99%) negative for Pax7 at initial isolation. Colony-forming units of these cells typically include non-adherent type myogenic cells, while satellite cells are known to be adherent in cell culture. In addition, both Pax7(-) and Pax7(+) cells are produced, depending on asymmetric cell division. A large number of myotubes are also formed in each colony, thus suggesting that putative Pax7(+) satellite cells also present in each colony. Interestingly, interstitial myogenic cells show basal lamina formation at early stages of myogenesis in response to various types of stimulation in compensatory enlarged muscle, a property that satellite cells do not possess in the parent fiber basal lamina cylinder. Basal lamina formation and production of satellite cells are essential before muscle fiber establishment in vivo. It is therefore likely that myogenic cells in skeletal muscle can be divided into two populations: 1) basal lamina-producing myogenic cells; and 2) basal lamina-non-producing myogenic cells. The latter population may be Pax7(+) satellite cells showing adherent capacity in cell culture, while the lamina-producing myogenic population derived from interstitial multipotent stem cells, which is predominant among Sk-34 and Sk-DN cells, plays a role in primary myoblast generation and shows non-adherent behavior in culture. Therefore, the physiological role of interstitial myogenic cells is as a source for new postnatal muscle fiber formation, and multinucleated muscle fibers (cells) are potentially formed clonally.

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Architectural and mechanical properties of the rat adductor longus: Response to weight-lifting training

Cited by 32 publications

References 34 publications

Examination of intrafascicular muscle fiber terminations: Implications for tension delivery in series-fibered muscles

Examination of intrafascicular muscle fiber terminations: Implications for tension delivery in series-fibered muscles

Different frequency treadmill running in immobilization‐induced muscle atrophy and ankle joint contracture of rats

Plasticity and Physiological Role of Stem Cells Derived from Skeletal Muscle Interstitium: Contribution to Muscle Fiber Hyperplasia and Therapeutic Use

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