scholarly journals Phase Angle Is a Marker of Muscle Quantity and Strength in Overweight/Obese Former Athletes

2021 ◽  
Vol 18 (12) ◽  
pp. 6649
Author(s):  
Catarina N. Matias ◽  
Francesco Campa ◽  
Catarina L. Nunes ◽  
Rubén Francisco ◽  
Filipe Jesus ◽  
...  
Keyword(s):  
Skeletal Muscle ◽  
Muscle Mass ◽  
Aerobic Capacity ◽  
Skeletal Muscle Mass ◽  
Isometric Strength ◽  
Upper Body ◽  
Lower Body ◽  
Maximal Aerobic Capacity ◽  
Former Athletes ◽  
Body Strength

Background: An increasing body of evidence indicates that the phase angle (PhA) can be applied as a marker of nutritional status, disease prognosis, and mortality probability. Still, it is not known whether PhA can be used as an indicator of muscular quantity and strength and maximal aerobic capacity in overweight/obese former highly active individuals, an understudied population. This study aimed to analyze the association between PhA with skeletal muscle mass, maximal isometric strength, and maximal aerobic capacity through VO2max, in overweight/obese and inactive former athletes. Methods: Cross-sectional information of 94 (62 males) former adult athletes (age: 43.1 ± 9.4 years old; body mass index: 31.4 ± 4.8 kg/m2) taking part in a weight-loss clinical trial was analyzed. Total fat and fat-free mass were determined by dual-energy X-ray absorptiometry, while skeletal muscle mass was predicted from appendicular lean soft tissue. Values for upper- and lower-body maximal isometric strength were assessed by handgrip and leg press dynamometry. VO2max was determined by indirect calorimetry through a graded exercise test performed on a treadmill. Results: PhA was associated with skeletal muscle mass (r = 0.564, p < 0.001), upper-body strength (r = 0.556, p < 0.001), lower-body strength (r = 0.422, p < 0.001), and VO2max (r = 0.328, p = 0.013). These relationships remained significant for skeletal muscle mass (β = 2.158, p = 0.001), maximal isometric strength (upper-body: β = 2.846, p = 0.012; low-er-body: β = 24.209, p = 0.041) after adjusting for age, sex, and fat mass but not for VO2max (β = −0.163, p = 0.098). Conclusion: Our findings indicated that former athletes with higher values of PhA exhibited greater muscle mass and strength, despite sex, age, and body composition, which suggests that this simple raw BI parameter can be utilized as an indicator of muscle quantity and functionality in overweight/obese former athletes.

Role of central circulatory factors in the fat-free mass-maximal aerobic capacity relation across age

1998 ◽  
Vol 275 (4) ◽  
pp. H1178-H1182 ◽  
Author(s):  
Brian E. Hunt ◽  
Kevin P. Davy ◽  
Pamela P. Jones ◽  
Christopher A. DeSouza ◽  
Rachael E. Van Pelt ◽  
...  
Keyword(s):  
Skeletal Muscle ◽  
Oxygen Consumption ◽  
Stroke Volume ◽  
Muscle Mass ◽  
Blood Volume ◽  
Aerobic Capacity ◽  
Skeletal Muscle Mass ◽  
Maximal Oxygen Consumption ◽  
Fat Free Mass ◽  
Maximal Aerobic Capacity

Fat-free mass (FFM) (primarily skeletal muscle mass) is related to maximal aerobic capacity among healthy humans across the adult age range. The basis for this physiological association is assumed to be a direct relation between skeletal muscle mass and its capacity to consume oxygen. We tested the alternative hypothesis that FFM exerts its influence on maximal aerobic capacity in part via an association with central circulatory function. To do so, we analyzed data from 103 healthy sedentary adults aged 18–75 yr. FFM was strongly and positively related to maximal oxygen consumption ( r = 0.80, P < 0.001). FFM was also strongly and positively related to supine resting levels of blood volume ( r = 0.79, P < 0.001) and stroke volume ( r = 0.75, P < 0.001). Statistically controlling for the collective influences of blood volume and stroke volume abolished the tight relation between FFM and maximal oxygen consumption ( r = 0.12, not significant). These results indicate that 1) FFM may be an important physiological determinant of blood volume and stroke volume among healthy sedentary adult humans of varying age; and 2) this relation between FFM and central circulatory function appears to represent the primary physiological basis for the strong association between FFM and maximal aerobic capacity in this population. Our findings suggest that sarcopenia (loss of skeletal muscle mass with aging) may contribute to the age-related decline in maximal aerobic capacity primarily via reductions in blood volume and stroke volume rather than a direct effect on the oxygen-consuming potential of muscle per se.

scholarly journals Skeletal muscle mass and the reduction ofV˙o 2 max in trained older subjects

1997 ◽  
Vol 82 (5) ◽  
pp. 1411-1415 ◽  
Author(s):  
David N. Proctor ◽  
Michael J. Joyner
Keyword(s):  
Skeletal Muscle ◽  
Older Women ◽  
Muscle Mass ◽  
Aerobic Capacity ◽  
Skeletal Muscle Mass ◽  
Muscle Blood Flow ◽  
Older Men ◽  
Analysis Of Covariance ◽  
Active Muscle ◽  
Older Subjects

Proctor, David N., and Michael J. Joyner. Skeletal muscle mass and the reduction ofV˙o 2 max in trained older subjects. J. Appl. Physiol.82(5): 1411–1415, 1997.—The role of skeletal muscle mass in the age-associated decline in maximal O2 uptake (V˙o 2 max) is poorly defined because of confounding changes in muscle oxidative capacity and in body fat and the difficulty of quantifying active muscle mass during exercise. We attempted to clarify these issues by examining the relationship between several indexes of muscle mass, as estimated by using dual-energy X-ray absorptiometry and treadmillV˙o 2 max in 32 chronically endurance-trained subjects from four groups ( n = 8/group): young men (20–30 yr), older men (56–72 yr), young women (19–31 yr), and older women (51–72 yr).V˙o 2 max per kilogram body mass was 26 and 22% lower in the older men (45.9 vs. 62.0 ml ⋅ kg−1 ⋅ min−1) and older women (40.0 vs. 51.5 ml ⋅ kg−1 ⋅ min−1). These age differences were reduced to 14 and 13%, respectively, whenV˙o 2 max was expressed per kilogram of appendicular muscle. When appropriately adjusted for age and gender differences in appendicular muscle mass by analysis of covariance, whole bodyV˙o 2 max was 0.50 ± 0.09 l/min less ( P < 0.001) in the older subjects. This effect was similar in both genders. These findings suggest that the reducedV˙o 2 max seen in highly trained older men and women relative to their younger counterparts is due, in part, to a reduced aerobic capacity per kilogram of active muscle independent of age-associated changes in body composition, i.e., replacement of muscle tissue by fat. Because skeletal muscle adaptations to endurance training can be well maintained in older subjects, the reduced aerobic capacity per kilogram of muscle likely results from age-associated reductions in maximal O2 delivery (cardiac output and/or muscle blood flow).

Relationships between balance and physical fitness variables in firefighter recruits

Work ◽  
2021 ◽  
Vol 68 (3) ◽  
pp. 667-677
Author(s):  
Rudi A. Marciniak ◽  
Kyle T. Ebersole ◽  
David J. Cornell
Keyword(s):  
Aerobic Capacity ◽  
Dynamic Balance ◽  
Pearson Correlation ◽  
Fat Free Mass ◽  
Upper Body ◽  
Future Research ◽  
Lower Body ◽  
Body Strength ◽  
Balance Ability ◽  
Lower Body Strength

BACKGROUND: Research has suggested that balance ability contributes to musculoskeletal injury (MSKI) rates in firefighters. Though the Y-Balance Test (YBT) can predict injury, it is unclear what physical measures inform YBT performance in firefighters. Thus, there is a lack of knowledge regarding best practice for improving balance in firefighters. OBJECTIVE: To evaluate the relationship between the YBT and fitness measures, including body composition, aerobic capacity, functional total-body power, upper and lower-body strength, and movement efficiency, among firefighters. METHODS: Dynamic balance (YBT), body mass index (BMI), body-fat percentage (BF%), fat free mass (FFM), aerobic capacity (VO2max), stair climb (SC), upper (1RMbench) and lower-body (1RMsquat) strength, and Fusionetics™ Movement Efficiency Screen (ME) measures were collected among 35 firefighter recruits. Pearson correlation coefficients were used to examine relationships between YBT and the performance measures. RESULTS: Dynamic balance ability in firefighter recruits is significantly (p < 0.05) related to BMI, lower-body strength, and movement quality, but not with aerobic capacity, stair climb performance, and upper body strength. CONCLUSIONS: Greater YBT performance in firefighter recruits is associated with lower BMI, greater functional movement, and greater lower-body strength. Future research is warranted to incorporate these elements into balance training programs for firefighter recruits.

scholarly journals Efficacy of Creatine Supplementation Combined with Resistance Training on Muscle Strength and Muscle Mass in Older Females: A Systematic Review and Meta-Analysis

Nutrients ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 3757
Author(s):  
Ellem Eduarda Pinheiro dos Santos ◽  
Rodrigo Cappato de de Araújo ◽  
Darren G. Candow ◽  
Scott C. Forbes ◽  
Jaddy Antunes Guijo ◽  
...  
Keyword(s):  
Resistance Training ◽  
Muscle Strength ◽  
Muscle Mass ◽  
Creatine Supplementation ◽  
Upper Body ◽  
Lower Body ◽  
Level Of Evidence ◽  
Age Related ◽  
Body Strength ◽  
Lower Body Strength

Sarcopenia refers to the age-related loss of muscle strength and muscle mass, which is associated with a reduced quality of life, particularly in older females. Resistance training (RT) is well established to be an effective intervention to counter indices of sarcopenia. Accumulating research indicates that the addition of creatine supplementation (Cr) to RT augments gains in muscle strength and muscle mass, compared to RT alone. However, some evidence indicates that sex differences may alter the effectiveness of Cr. Therefore, we systematically reviewed randomized controlled trials (RCTs) investigating the efficacy of Cr + RT on measures of upper- and lower-body strength and muscle mass in older females. A systematic literature search was performed in nine electronic databases. Ten RCTs (N = 211 participants) were included the review. Overall, Cr significantly increased measures of upper-body strength (7 studies, n = 142, p = 0.04), with no effect on lower-body strength or measures of muscle mass. Sub-analyses revealed that both upper-body (4 studies, n = 97, p = 0.05) and lower-body strength (4 studies, n = 100, p = 0.03) were increased by Cr, compared to placebo in studies ≥ 24 weeks in duration. In conclusion, older females supplementing with Cr experience significant gains in muscle strength, especially when RT lasts for at least 24 weeks in duration. However, given the level of evidence, future high-quality studies are needed to confirm these findings.

Androgenic and estrogenic regulation of skeletal muscle mass and atrophy signaling in male mice

2013 ◽  
Author(s):  
Naeyer Helene De ◽  
Inge Everaert ◽  
Spaey Annelies De ◽  
Jean-Marc Kaufman ◽  
Youri Taes ◽  
...  
Keyword(s):  
Skeletal Muscle ◽  
Muscle Mass ◽  
Skeletal Muscle Mass ◽  
Male Mice ◽  
Estrogenic Regulation

The BMI and skeletal muscle mass as a risk factor of carotid atherosclerosis in patients with type 2 diabetes

2018 ◽  
Author(s):  
Se-Hwa Kim ◽  
Soo-Kyung Kim ◽  
Young-Ju Choi ◽  
Seok-Won Park ◽  
Eun-Jig Lee ◽  
...  
Keyword(s):  
Type 2 Diabetes ◽  
Skeletal Muscle ◽  
Risk Factor ◽  
Muscle Mass ◽  
Skeletal Muscle Mass ◽  
Carotid Atherosclerosis

771-P: Protein Intake at Breakfast Contributes to Maintenance of Skeletal Muscle Mass in Japanese Elderly Patients with Type 2 Diabetes

Diabetes ◽  
2019 ◽  
Vol 68 (Supplement 1) ◽  
pp. 771-P
Author(s):  
SODAI KUBOTA ◽  
HITOSHI KUWATA ◽  
SAKI OKAMOTO ◽  
DAISUKE YABE ◽  
KENTA MUROTANI ◽  
...  
Keyword(s):  
Type 2 Diabetes ◽  
Skeletal Muscle ◽  
Elderly Patients ◽  
Muscle Mass ◽  
Protein Intake ◽  
Skeletal Muscle Mass ◽  
P Protein ◽  
Japanese Elderly
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