scholarly journals Circulatory microRNAs are not effective biomarkers of muscle size and function in middle-aged men

2019 ◽  
Vol 316 (2) ◽  
pp. C293-C298 ◽  
Author(s):  
Randall F. D’Souza ◽  
Nina Zeng ◽  
Sally D. Poppitt ◽  
David Cameron-Smith ◽  
Cameron J. Mitchell
Keyword(s):  
Lean Mass ◽  
Knee Extension ◽  
Muscle Size ◽  
Whole Body ◽  
Regulatory Function ◽  
Middle Aged ◽  
Cross Sectional ◽  
Total Body ◽  
And Function ◽  
Body Lean Mass

Loss of muscle size and strength with aging is a major cause of morbidity. Although muscle size and strength are measured by imaging or fiber cross-sectional staining and exercise testing, respectively, the development of circulatory biomarkers for these phenotypes would greatly simplify identification of muscle function deficits. MicroRNAs (miRNAs) are short noncoding RNAs that regulate gene translation and, thereby, contribute to muscle phenotype. To assess circulatory miRNAs (c-miRNAs) applicability as potential biomarkers of muscular phenotypes, fasting plasma and muscle samples were obtained from 50 middle-aged healthy men [mean  (SD); age: 48.8 yr (SD 4.5); BMI: 26.6 kg/m2 (SD 3.3)]. RT-PCR of 38 miRNAs with known regulatory function within skeletal muscle identified four c-miRNAs (miR-221, miR-451a, miR-361, and miR-146a) related to either total body lean mass, leg lean mass, and 50% thigh cross-sectional area (CSA), but not strength. There was no relationship with the expression of these miRNAs in muscle. Six miRNAs within muscle were correlated with whole body lean mass, leg lean mass, and isometric knee extension torque (miR-133a and miR-146a), and 50% thigh CSA (miR-486, miR-208b, miR-133b, and miR-208a). Only miR-23b demonstrated a relationship between tissue and circulatory expression; however, only 10% of the variance was explained. miR-146a in both plasma and muscle was related to phenotype; however, no relationship between plasma and muscle expression was evident. A different subset of miRNAs correlated to muscle phenotype in muscle compared with plasma samples, suggesting that c-miRNA biomarkers of muscle phenotype are likely unrelated to muscle expression in healthy individuals.

scholarly journals Examining Bone, Muscle and Fat in Middle-Aged Long-Term Endurance Runners: A Cross-Sectional Study

2020 ◽  
Vol 9 (2) ◽  
pp. 522
Author(s):  
Ulrike H. Mitchell ◽  
Bruce Bailey ◽  
Patrick J. Owen
Keyword(s):  
Exercise Training ◽  
Aerobic Exercise ◽  
Fat Mass ◽  
Lean Mass ◽  
Aerobic Exercise Training ◽  
Middle Aged ◽  
Cross Sectional ◽  
Endurance Runners ◽  
Total Body

Aerobic exercise training has many known cardiovascular benefits that may promote healthy aging. It is not known if long-term aerobic exercise training is also associated with structural benefits (e.g., lower fat mass, higher areal bone mineral density (BMD) and greater muscle mass). We evaluated these parameters in middle-aged long-term endurance runners compared to sex-, age-, height-, and weight-matched non-running controls. Total and regional lean and fat mass and areal BMD were assessed by dual-energy X-ray absorptiometry. Sagittal magnetic resonance images captured the cross-sectional area and thickness of the lumbar multifidus. Runners (n = 10; all male) had a mean (standard deviation; SD) age of 49 (4) years, height of 178.9 (4.9) cm, weight of 67.8 (5.8) kg, body mass index (BMI) of 21.4 (1.4) kg/m2 and had been running 82.6 (27.9) km/week for 23 (13) years. Controls (n = 9) had a mean (SD) age of 51 (5) years, height of 176.0 (5.1) cm, weight of 72.8 (7.1) kg, and BMI of 23.7 (2.1) kg/m2. BMI was greater in controls (p = 0.010). When compared to controls on average, runners had a 10 percentage-point greater total body lean mass than controls (p = 0.001) and 14% greater trunk lean mass (p = 0.010), as well as less total body (8.6 kg; p < 0.001), arm (58%; p = 0.002), leg (52%; p < 0.001), trunk (73%; p < 0.001), android (91%; p < 0.001), and gynoid fat mass (64%; p < 0.001). No differences were observed between groups for BMD outcomes or multifidus size. These results underscore the benefits of endurance running to body composition that carry over to middle-age.

scholarly journals SARCOPENIA ACCORDING TO BRAZILIAN AND EWGSOP 2 CUTOFFS: DATA FROM SARCOS

2019 ◽  
Vol 3 (Supplement_1) ◽  
pp. S898-S898
Author(s):  
Julia M Menezes ◽  
Angela T Paes ◽  
Alberto Frisoli
Keyword(s):  
Muscle Strength ◽  
Lean Mass ◽  
Diagnostic Errors ◽  
Dominant Hand ◽  
Cross Sectional ◽  
Total Body Lean Mass ◽  
Cutoff Points ◽  
The Mean ◽  
Total Body ◽  
Body Lean Mass

Abstract Cutoff values for lean mass and muscle strength are still controversial in the diagnosis of sarcopenia. The use of European, American and Asian consensus outside these regions may lead to important diagnostic errors. We hypothesized that there are significant differences between the cutoff points from Brazil and Europe in older people. This is a cross-sectional analyses of 502 older adults from SARCOS study, conducted at São Paulo - Brazil. All subjects underwent DXA analyses of total body. Lean mass was obtained from appendicular lean mass by height2 and muscle strength by dynamometer of dominant hand. The Brazilian cutoff points were based on 25th percentile by gender. The European ones were from EWGSOP 2. Agreement was assessed by the Kappa coefficient. The mean age was 78.39 ± 7.08 years old and 277 (55.18%) individuals were women. Among the ethnic groups, 339 (67.53%) were caucasian, 145 (28.88%) afrodescendants and 18 (3.59%) asians. The Brazilian cutoffs for muscle strength were 26 kg for men and 16 kg for women (equivalent to EWGSOP2); while those for lean mass were significantly lower, 6.56 kg/m2 vs. 5.56 kg/m2, respectively. The prevalence by EWGSOP 2 was higher than that obtained by the Brazilian cutoff points (20.32% vs 14.14%, p &lt;0.001), even though these criteria presented Kappa = 0.792; p &lt;0.001. Considering these disparities, 6 out of 100 subjects are considered sarcopenic by European criteria and not by the Brazilian cutoffs. There are significant differences in sarcopenia cutoffs between Brazil and Europe, and this cause important diagnostic variations.

scholarly journals Measures Derived from Panoramic Ultrasonography and Animal-Based Protein Intake Are Related to Muscular Performance in Middle-Aged Adults

2021 ◽  
Vol 10 (5) ◽  
pp. 988
Author(s):  
Nathaniel R. Johnson ◽  
Christopher J. Kotarsky ◽  
Kyle J. Hackney ◽  
Kara A. Trautman ◽  
Nathan D. Dicks ◽  
...  
Keyword(s):  
Protein Intake ◽  
Handgrip Strength ◽  
Muscle Size ◽  
Dietary Intakes ◽  
Lower Body ◽  
Linear Regression Models ◽  
Middle Aged ◽  
Cross Sectional ◽  
Muscular Performance ◽  
Middle Aged Adults

Ultrasonography advantageously measures skeletal muscle size and quality, but some muscles may be too large to capture with standardized brightness mode (B-mode) imaging. Panoramic ultrasonography can capture more complete images and may more accurately measure muscle size. We investigated measurements made using panoramic compared to B-mode ultrasonography images of the rectus femoris with muscular performance. Concurrently, protein intake plays an important role in preventing sarcopenia; therefore, we also sought to investigate the association between animal-based protein intake (ABPI) and muscular performance. Ninety-one middle-aged adults were recruited. Muscle cross-sectional area (CSA) and thickness were obtained using B-mode and panoramic ultrasound and analyzed with Image J software. Muscular performance was assessed using isokinetic dynamometry, a 30-s chair test, and handgrip strength. Three-day food diaries estimated dietary intakes. Linear regression models determined relationships between measures from ultrasonography and muscular performance. Mixed linear models were used to evaluate the association between ABPI and muscular performance. Muscle CSA from panoramic ultrasonography and ABPI were positively associated with lower-body strength (β ± S.E.; CSA, 42.622 ± 20.024, p = 0.005; ABPI, 65.874 ± 19.855, p = 0.001), lower-body endurance (β ± S.E.; CSA, 595 ± 200.221, p = 0.001; ABPI, 549.944 ± 232.478, p = 0.020), and handgrip strength (β ± S.E.; CSA, 6.966 ± 3.328, p = 0.004; ABPI, 0.349 ± 0.171, p = 0.045). Panoramic ultrasound shows promise as a method for assessing sarcopenia. ABPI is related to better muscular performance.

scholarly journals Serum betaine is inversely associated with low lean mass mainly in men in a Chinese middle-aged and elderly community-dwelling population

2016 ◽  
Vol 115 (12) ◽  
pp. 2181-2188 ◽  
Author(s):  
Bi-xia Huang ◽  
Ying-ying Zhu ◽  
Xu-ying Tan ◽  
Qiu-ye Lan ◽  
Chun-lei Li ◽  
...  
Keyword(s):  
Lean Mass ◽  
Community Dwelling ◽  
The Body ◽  
Muscle Performance ◽  
Whole Body ◽  
Composition Analysis ◽  
Human Beings ◽  
Middle Aged ◽  
Chinese Adults ◽  
Skeletal Muscle Index

AbstractPrevious studies have demonstrated that betaine supplements increase lean body mass in livestock and improve muscle performance in human beings, but evidence for its effect on human lean mass is limited. Our study assessed the association of circulating betaine with lean mass and its composition in Chinese adults. A community-based study was conducted on 1996 Guangzhou residents (weight/mass: 1381/615) aged 50–75 years between 2008 and 2010. An interviewer-administered questionnaire was used to collect general baseline information. Fasting serum betaine was assessed using HPLC-MS. A total of 1590 participants completed the body composition analysis performed using dual-energy X-ray absorptiometry during a mean of 3·2 years of follow-up. After adjustment for age, regression analyses demonstrated a positive association of serum betaine with percentage of lean mass (LM%) of the entire body, trunk and limbs in men (all P<0·05) and LM% of the trunk in women (P=0·016). Each sd increase in serum betaine was associated with increases in LM% of 0·609 (whole body), 0·811 (trunk), 0·422 (limbs), 0·632 (arms) and 0·346 (legs) in men and 0·350 (trunk) in women. Multiple logistic regression analysis revealed that the prevalence of lower LM% decreased by 17 % (whole body) and 14 % (trunk) in women and 23 % (whole body), 28 % (trunk), 22 % (arms) and 26 % (percentage skeletal muscle index) in men with each sd increment in serum betaine. Elevated circulating betaine was associated with a higher LM% and lower prevalence of lower LM% in middle-aged and elderly Chinese adults, particularly men.

scholarly journals Association between Blood Pressure and Obesity Indices in Medical Students

2020 ◽  
Author(s):  
Shalini Gandhi ◽  
Jitender Sorout ◽  
Rohit Raina ◽  
Abhay Raina ◽  
Urvashi Miglani ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Medical Students ◽  
Cross Sectional Study ◽  
Whole Body ◽  
Poor Correlation ◽  
Cross Sectional ◽  
Study Results ◽  
Measuring Tape ◽  
Total Body ◽  
Obesity Indices

Introduction: Obesity is strongly associated with other metabolic disorders including Hypertension (HTN), diabetes and Cardiovascular Diseases (CVD). High Blood Pressure (BP) is ranked as the third most important risk factor for attributable burden of disease in South Asia. Aim: The aim of present was to study the association between BP and obesity indices in medical student’s population. Materials and Methods: A cross sectional study was conducted on a group of 100 healthy young medical students. BP, pulse and Hb O2% was measured by using sphygmomanometer, pulse oximeter. Obesity indices were measured by using weighing machine, stadiometer, measuring tape and impedance based Body Composition Analyser (BCA). Results: There was poor correlation of Systolic Blood Pressure (SBP) and Diastolic Blood Pressure (DBP) with Total Body Fat (TF) and the association was not significant. SBP and DBP were mildly correlated with BMI. Whole body Visceral Fat (VF) correlation of SBP was moderate and significant. DBP was correlated with whole body VF and correlation was significant. But the whole body, trunk, leg Skin Fat (SF) and Muscle Fat (MF) were not having significant correlation with SBP and DBP. Finger to heart distance was positively correlated with SBP (p<0.05). Also, O2%, chest and hip size were positively correlated with SBP (p<0.05). Only whole body VF and Waist Hip Ratio (WHR) were significantly (p<0.05) affected SBP. None of the other parameters affected DBP. Conclusion: The present study results found that Body Mass Index (BMI), VF and WHR had significant correlation with systolic and SBP and DBP. VF and WHR were significant predictors of SBP.

scholarly journals Cardiorespiratory Fitness May Influence Metabolic Inflexibility During Exercise in Obese Persons

2019 ◽  
Vol 104 (12) ◽  
pp. 5780-5790 ◽  
Author(s):  
Francisco J Amaro-Gahete ◽  
Guillermo Sanchez-Delgado ◽  
Ignacio Ara ◽  
Jonatan R. Ruiz
Keyword(s):  
Cardiorespiratory Fitness ◽  
Lean Mass ◽  
Normal Weight ◽  
Whole Body ◽  
Graded Exercise ◽  
Obese Subjects ◽  
Maximal Fat Oxidation ◽  
Metabolic Inflexibility ◽  
Overweight Subjects ◽  
Body Lean Mass

Abstract Context We examined whether obese individuals have a reduced maximal fat oxidation (MFO) and the intensity that elicit MFO (Fatmax) compared with normal weight and overweight persons, taking into account their level of cardiorespiratory fitness. Methods The study subjects were 138 sedentary adults (87 women) aged 30.1 ± 13.6 years. Based on their body mass index, subjects were categorized as being of normal weight (n = 66), overweight (n = 48), or obese (n = 24). MFO and Fatmax were determined for all subjects by indirect calorimetry, using a walking graded exercise test. MFO was expressed in absolute terms (g/min) and relative to whole-body lean mass (mg/kgleanmass/min). Cardiorespiratory fitness was assessed via a maximal treadmill test. Results No differences in absolute MFO and Fatmax values were seen between the obese, normal weight, and overweight subjects (all P > 0.2), although after adjusting for cardiorespiratory fitness, the obese subjects returned significantly higher values than did their normal weight and overweight counterparts (all P < 0.03). However, when expressed with respect to lean mass, the MFO of the normal weight subjects was significantly greater than that of the overweight and obese subjects, independent of age, sex, or cardiorespiratory fitness. Conclusions Obese individuals have higher absolute MFO values when cardiorespiratory fitness is taken into account, but when expressed with respect to lean mass, normal weight individuals show a greater capacity to oxidize fat during exercise per unit of metabolically active tissue independent of age, sex, or cardiorespiratory fitness. These findings suggest that obese individuals may suffer from metabolic inflexibility during exercise.

Total body skeletal muscle and adipose tissue volumes: estimation from a single abdominal cross-sectional image

2004 ◽  
Vol 97 (6) ◽  
pp. 2333-2338 ◽  
Author(s):  
Wei Shen ◽  
Mark Punyanitya ◽  
ZiMian Wang ◽  
Dympna Gallagher ◽  
Marie-Pierre St.-Onge ◽  
...  
Keyword(s):  
Skeletal Muscle ◽  
Body Mass Index ◽  
Adipose Tissue ◽  
Magnetic Resonance ◽  
Body Mass ◽  
Whole Body ◽  
Intervertebral Space ◽  
Cross Sectional ◽  
Abdominal Image ◽  
Total Body

A single abdominal cross-sectional computerized axial tomography and magnetic resonance image is often obtained in studies examining adipose tissue (AT) distribution. An abdominal image might also provide additional useful information on total body skeletal muscle (SM) and AT volumes with related physiological insights. We therefore investigated the relationships between abdominal SM and AT areas from single images and total body component volumes in a large and diverse sample of healthy adult subjects. Total body SM and AT volumes were derived by whole body multislice magnetic resonance imaging in 123 men [age (mean ± SD) of 41.6 ± 15.8 yr; body mass index of 25.9 ± 3.4 kg/m2] and 205 women (age of 47.8 ± 18.7 yr; body mass index of 26.7 ± 5.6 kg/m2). Single abdominal SM and AT slice areas were highly correlated with total body SM ( r = 0.71–0.92; r = 0.90 at L4–L5 intervertebral space) and AT ( r = 0.84–0.96; r = 0.94 at L4–L5 intervertebral space) volumes, respectively. R2 increased by only 5.7–6.1% for SM and 2.7–4.4% for AT with the inclusion of subject sex, age, ethnicity, scanning position, body mass index, and waist circumference in the model. The developed SM and AT models were validated in an additional 49 subjects. To achieve equivalent power to a study measuring total body SM or AT volumes, a study using a single abdominal image would require 17–24% more subjects for SM and 6–12% more subjects for AT. Measurement of a single abdominal image can thus provide estimates of total body SM and AT for group studies of healthy adults.

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