https://www.commed.vcu.edu/Chronic_Disease/2012/cochranrvwrschbias.pdf

The Cochrane Collaboration's tool for assessing risk of bias in randomised trials

Charge, Sophie B. P., and Michael A. Rudnicki. Cellular and Molecular Regulation of Muscle Regeneration. Physiol Rev 84: 209–238, 2004; 10.1152/physrev.00019.2003.—Under normal circumstances, mamma...

Cellular and Molecular Regulation of Muscle Regeneration

Mammalian skeletal muscle comprises different fiber types, whose identity is first established during embryonic development by intrinsic myogenic control mechanisms and is later modulated by neural and hormonal factors. The relative proportion of the different fiber types varies strikingly between species, and in humans shows significant variability between individuals. Myosin heavy chain isoforms, whose complete inventory and expression pattern are now available, provide a useful marker for fiber types, both for the four major forms present in trunk and limb muscles and the minor forms present in head and neck muscles. However, muscle fiber diversity involves all functional muscle cell compartments, including membrane excitation, excitation-contraction coupling, contractile machinery, cytoskeleton scaffold, and energy supply systems. Variations within each compartment are limited by the need of matching fiber type properties between different compartments. Nerve activity is a major control mechanism of the fiber type profile, and multiple signaling pathways are implicated in activity-dependent changes of muscle fibers. The characterization of these pathways is raising increasing interest in clinical medicine, given the potentially beneficial effects of muscle fiber type switching in the prevention and treatment of metabolic diseases.

Fiber types in mammalian skeletal muscles.

This review aims to summarize the latest developments with regard to physical fitness and several health outcomes in young people. The literature reviewed suggests that (1) cardiorespiratory fitness levels are associated with total and abdominal adiposity; (2) both cardiorespiratory and muscular fitness are shown to be associated with established and emerging cardiovascular disease risk factors; (3) improvements in muscular fitness and speed/agility, rather than cardiorespiratory fitness, seem to have a positive effect on skeletal health; (4) both cardiorespiratory and muscular fitness enhancements are recommended in pediatric cancer patients/survivors in order to attenuate fatigue and improve their quality of life; and (5) improvements in cardiorespiratory fitness have positive effects on depression, anxiety, mood status and self-esteem, and seem also to be associated with a higher academic performance. In conclusion, health promotion policies and physical activity programs should be designed to improve cardiorespiratory fitness, but also two other physical fitness components such us muscular fitness and speed/agility. Schools may play an important role by identifying children with low physical fitness and by promoting positive health behaviors such as encouraging children to be active, with special emphasis on the intensity of the activity.

Physical fitness in childhood and adolescence: a powerful marker of health

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Biomechanics And Motor Control Of Human Movement

The anomalous distal musculotendinous junction of the fibularis brevis muscle has been hypothesized to contribute to the development of longitudinal fibularis brevis tendon tears. Specifically, the mass effect of the low-lying fibularis brevis muscle belly was thought to increase the pressure on the superior peroneal retinaculum and increase the probability of fibularis brevis tendon subluxation. A more recent examination of the fibularis brevis tendon junction found, contrary to this hypothesis, a statistically significant association between an anomalous proximal musculotendinous junction and the prevalence of longitudinal split tears. However, no rationale was offered. The present study examined the relationship between the musculotendinous junction and the prevalence of longitudinal fibularis brevis tendon tears. A total of 24 fibularis brevis tendon lengths were measured bilaterally in 12 human cadaveric specimens. The tendon lengths were assessed as the vertical distance from the most inferior aspect of the lateral malleolus to the most distal fibularis brevis musculotendinous extension. Only full-thickness tears were identified and included. The lengths of tendons with and without longitudinal tears were compared. Of the 24 tendons examined, 7 (29%) presented with full-thickness longitudinal tears from 4 cadavers (33%). The mean length for the tendons with tears was significantly longer (p < .001) than the mean length of those without tears (28.86 ± 3.02 mm versus 16.29 ± 7.30 mm). Our research concurs with the most recent findings, identifying a statistically significant association between an anomalous proximal muscle belly extension and longitudinal fibularis brevis tendon tears. Furthermore, we propose the hypothesis that a more proximal musculotendinous junction might predispose individuals to a lesser stabilizing effect of the muscle against the posterior lateral surface of the fibula, increasing the probability of anterolateral subluxation, attrition, and longitudinal tear development.

A Proximal Fibularis Brevis Muscle Is Associated with Longitudinal Split Tendons: A Cadaveric Study

The study's objective was to determine whether estradiol (E2) deficiency alters the functional relationship of muscle to bone and causes a differential increase in injury susceptibility. Ovariectomized 6-wk-old mice were administered E2 (40 micrograms. day-1. kg-1; n = 8) or the oil vehicle (n = 8) for 21 days. The anterior crural muscles of the left hindlimb were then stimulated to produce 150 maximal in vivo eccentric contractions. In vitro functional measurements were then made on the extensor digitorum longus (EDL) muscle and tibia from both the exercised and unexercised legs. The maximal isometric torque produced by the anterior crural muscles before the eccentric contraction protocol and the unexercised EDL maximal isometric tetanic force (P(0)) were higher in E2-treated mice by 18 and 14%, respectively (P < or = 0.03). Both ultimate load and stiffness for the unexercised tibia were higher by 16% in E2-treated mice (P < or = 0.03). The muscle-to-bone relationship of these measurements was unaffected by E2 status (P > or = 0.59). No evidence for increased injury susceptibility was found in either tissue from E2-deficient mice. In fact, the decrement in P(0) was only 36.9 +/- 3.8% in exercised EDL muscles from E2-deficient mice compared with 50.6 +/- 4.2% in exercised muscles from E2-treated mice (P = 0.03). Tibia stiffness was 3.9% higher in bones from exercised legs than in bones from unexercised legs (72.64 +/- 2.77 vs. 69.95 +/- 2.66 N/mm; P = 0.05) with ultimate load showing a similar trend (P = 0.07); no effect of E2 status was observed on these differences (P > or = 0.53). In conclusion, the functional relationship of bone to muscle and the susceptibility to injury in bone are not altered by the presence of E2 in ovariectomized mice; however, E2 does increase injury susceptibility in the EDL muscle.

Estradiol effect on anterior crural muscles: tibial bone relationship and susceptibility to injury.: 896

Fluid Replacement In The Heat: Effects Of Betaine

Time, graft, sex, geographic location, and isokinetic speed influence the degree of quadriceps weakness after anterior cruciate ligament reconstruction: a systematic review and meta-analysis

An estimated 70% of people will experience low back pain at some point in their lives, and recurrence rates
can be as high as 85%. Recent studies suggest that yoga – a widely practiced physical/mental discipline – may
relieve back pain and reduce functional disability. The objective of this study was to conduct a systematic review and
meta-analysis of the existing research on the effects of yoga on chronic low back pain and function. Our literature
search began April 2011 and continued through October 2011. Cochrane, PubMed, CINAHL, Embase, ProQuest
Dissertations and Theses, Google Scholar, and Clinicaltrials.gov databases were searched electronically. The search
terms used were: yoga AND back pain. A total of 58 relevant studies were originally identified through the database
searches. Of those, 45 were excluded on the basis of the title and/or review of the abstract. The 13 remaining studies
were fully evaluated via a careful review of the full text. On the basis of the inclusion and exclusion criteria, 6 studies
were excluded, leaving a total of 7 studies to be included in the meta-analyses of the impact of yoga on low back pain
and function. Effect sizes were calculated as the standardized mean difference and meta-analyses were completed
using a random-effects model. Overall, yoga was found to result in a medium, beneficial effect on chronic low back
pain [overall effect size (ES) = 0.58, p<0.001], indicating that subjects practicing yoga reported significantly less pain
than control subjects. Yoga subjects also reported significantly less functional disability after the intervention (overall
ES = 0.53, p<0.001). Moreover, the improvements in pain and function for yoga subjects remained statistically
significant 12-24 weeks after the end of the intervention (overall ES = 0.44-0.54, p≤0.002). In conclusion, yoga
practice can significantly reduce pain and increase functional ability in chronic low back pain patients.

/pdf/impact-of-yoga-on-low-back-pain-and-function-a-systematic-4xh3rlfuog.pdf

Gordon L. Warren

Papers

A Proximal Fibularis Brevis Muscle Is Associated with Longitudinal Split Tendons: A Cadaveric Study

Estradiol effect on anterior crural muscles: tibial bone relationship and susceptibility to injury.: 896

Fluid Replacement In The Heat: Effects Of Betaine

Time, graft, sex, geographic location, and isokinetic speed influence the degree of quadriceps weakness after anterior cruciate ligament reconstruction: a systematic review and meta-analysis

Impact of Yoga on Low Back Pain and Function: A Systematic Review and Meta-Analysis