Lower limit of body fat in healthy active men

We examined body composition changes in 55 normal young men during an 8-wk Army combat leadership training course involving strenuous exercise and low energy intake, with an estimated energy deficit of 5.0 +/- 2.0 MJ/day and a resultant 15.7 +/- 3.1% weight loss. Percent body fat (BF) measured by dual-energy X-ray absorptiometry (DEXA) averaged 14.3% (range 6–26%) and 5.8 +/- 1.8% (range 4–11%) at the beginning and end of the course, respectively. Men who achieved a minimum percent BF (4–6%) by 6 wk demonstrated only small additional total and subcutaneous fat losses in the final 2 wk and sacrificed increasingly larger proportions of fat-free mass. Percent BF estimated from skinfold thicknesses reflected relative changes in fat mass, although actual percent BF was overestimated. Instead of reaching a plateau after fat stores were substantially depleted, abdominal, hip, and thigh girths continued to decline with body weight loss. Final percent BF for the leanest men was similar to that observed after a 25% body weight reduction in the 1950 Minnesota study (5.2% by underwater weighting), and height-corrected final fat mass was the same (1.0 +/- 0.2 vs. 0.9 +/- 0.7 kg fat/m2), suggesting that these values represent a minimal body fat content in healthy men and that weight loss subsequent to achieving this level is contributed from the fat-free mass. Our results suggest that 4–6% BF or approximately 2.5 kg fat represents the lower limit for healthy men, as assessed by DEXA or by underwater weighing.

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Resistive training increases fat-free mass and maintains RMR despite weight loss in postmenopausal women

Journal of Applied Physiology ◽

10.1152/jappl.1995.79.3.818 ◽

1995 ◽

Vol 79 (3) ◽

pp. 818-823 ◽

Cited By ~ 100

Author(s):

A. S. Ryan ◽

R. E. Pratley ◽

D. Elahi ◽

A. P. Goldberg

Keyword(s):

Weight Loss ◽

Body Weight ◽

Postmenopausal Women ◽

Body Fat ◽

Fat Mass ◽

Management Program ◽

Fat Free Mass ◽

Percent Body Fat ◽

Plasma Norepinephrine ◽

Resistive Training

Percent body fat increases with age and is often accompanied by a loss in muscle mass, strength, and energy expenditure. The effects of 16 wk of resistive training (RT) alone or with weight loss (RTWL) on strength (isokinetic dynamometer), body composition (dual-energy X-ray absorptiometry), resting metabolic rate (RMR) (indirect calorimetry), and sympathetic nervous system activity (catecholamines) were examined in 15 postmenopausal women (50–69 yr). RT resulted in significant improvements in upper and lower body strength in both groups (P < 0.01). The nonobese women in the RT group (n = 8) did not change their body weight or fat mass with training. In the obese RTWL group (n = 7), body weight, fat mass, and percent body fat were significantly decreased (P < 0.001). Fat-free mass and RMR significantly increased with training in both groups combined (P < 0.05). There were no significant changes in resting arterialized plasma norepinephrine or epinephrine levels in either group with training. RT increases strength with and without weight loss. Furthermore, RT and RTWL increase fat-free mass and RMR and decrease percent fat in postmenopausal women. Thus, RT may be a valuable component of an integrated weight management program in postmenopausal women.

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The Influence of Age, Sex and Body Mass Index on the Effectiveness of Brisk Walking for Obesity Management in Adults: A Systematic Review and Meta-Analysis

Journal of Physical Activity and Health ◽

10.1123/jpah.2016-0064 ◽

2017 ◽

Vol 14 (5) ◽

pp. 389-407 ◽

Cited By ~ 5

Author(s):

Leon Mabire ◽

Ramakrishnan Mani ◽

Lizhou Liu ◽

Hilda Mulligan ◽

David Baxter

Keyword(s):

Body Mass Index ◽

Body Weight ◽

Waist Circumference ◽

Body Fat ◽

Fat Mass ◽

Fat Free Mass ◽

Body Fat Percentage ◽

Brisk Walking ◽

Obesity Management ◽

Fat Percentage

Background:Brisk walking is the most popular activity for obesity management for adults. We aimed to identify whether participant age, sex and body mass index (BMI) influenced the effectiveness of brisk walking.Methods:A search of 9 databases was conducted for randomized controlled trials (RCTs). Two investigators selected RCTs reporting on change in body weight, BMI, waist circumference, fat mass, fat-free mass, and body fat percentage following a brisk walking intervention in obese adults.Results:Of the 5072 studies screened, 22 met the eligibility criteria. The pooled mean differences were: weight loss, –2.13 kg; BMI, –0.96 kg/m2; waist circumference, –2.83 cm; fat mass, –2.59 kg; fat-free mass, 0.29 kg; and body fat percentage, –1.38%. Meta-regression of baseline BMI showed no effect on changes.Conclusions:Brisk walking can create a clinically significant reduction in body weight, BMI, waist circumference, and fat mass for obese men and women aged under 50 years. Obese women aged over 50 years can achieve modest losses, but gains in fat-free mass reduce overall change in body weight. Further research is required for men aged over 50 years and on the influence of BMI for all ages and sexes.

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Effects of Ad Libitum Low Carbohydrate Versus Low Fat Diets on Body Weight and Fat Mass

Current Developments in Nutrition ◽

10.1093/cdn/nzaa049_051 ◽

2020 ◽

Vol 4 (Supplement_2) ◽

pp. 658-658

Author(s):

Alex Schick ◽

James Boring ◽

Amber Courville ◽

Isabelle Gallagher ◽

Juen Guo ◽

...

Keyword(s):

Weight Loss ◽

Body Weight ◽

Body Fat ◽

Fat Mass ◽

Kidney Diseases ◽

Primary Study ◽

Low Fat ◽

Fat Loss ◽

Low Carbohydrate ◽

Ad Libitum

Abstract Objectives To describe the effects of ad libitum low-fat (LF) and low-carbohydrate (LC) diets on body weight and fat mass. Methods Sixteen adults without diabetes spent 29 continuous days residing at the Metabolic Clinical Research Unit of the NIH Clinical Center where they were fed ad libitum either an animal-based, LC diet (75% fat, 10% carbohydrates, 15% protein) or a plant-based, LF diet (75% carbohydrates, 10% fat, 15% protein). Participants were randomly assigned to one diet for the first phase of the study (14 days), after which they were switched to the other diet for the remainder of the study. Participants were given three meals daily and were provided with additional snacks amounting to 200% of their daily energy requirements as determined by their resting energy expenditure multiplied by 1.6. Subjects were told that this was not a weight loss study and were not informed about the primary study aim. They were instructed to eat as much or as little as they desired. Total body weight and fat mass were measured using a calibrated scale and dual-energy X-ray absorptiometry, respectively. Subjects were blinded to their data and wore loose-fitting scrubs to avoid any feedback regarding changes in the fit of their clothing. Results Subjects included 7 women and 9 men, with an age of (mean ± SE) 29 ± 1.7 years and BMI of 27.5 ± 1.5 at baseline. Participants lost weight on both diets, with the LC diet resulting in 1.34 ± 0.31 kg of weight loss (P = 0.0006) and the LF diet resulting in 1.09 ± 0.31 kg of weight loss (P = 0.003) which was not significantly different from the LC diet (P = 0.58). However, participants lost 0.6 ± 0.17 kg of body fat on the LF diet (P = 0.002) but the LC diet did not result in significant body fat loss (0.04 ± 0.17 kg; P = 0.8) and the difference in body fat loss between the diets was statistically significant (P = 0.03). Conclusions While participants lost similar amounts of weight on both diets, only the LF diet led to significant body fat loss. Early weight loss with a LC diet does not necessarily reflect a similar state of negative energy balance as compared with a LF diet. Funding Sources Intramural Research Program of the National Institutes of Diabetes and Digestive and Kidney Diseases.

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Effects of weight loss using supplementation with Lactobacillus strains on body fat and medium-chain acylcarnitines in overweight individuals

Food & Function ◽

10.1039/c6fo00993j ◽

2017 ◽

Vol 8 (1) ◽

pp. 250-261 ◽

Cited By ~ 15

Author(s):

Minkyung Kim ◽

Minjoo Kim ◽

Miso Kang ◽

Hye Jin Yoo ◽

Min Sun Kim ◽

...

Keyword(s):

Weight Loss ◽

Body Weight ◽

Body Fat ◽

Subcutaneous Fat ◽

The Body ◽

Body Fat Percentage ◽

Body Fat Mass ◽

Fat Percentage ◽

Probiotic Supplementation ◽

Percentage Body Fat

Probiotic supplementation increased the levels of C8:1, C14:1, C10, and C12:1 acylcarnitines, and these increases were correlated with a decrease in the body weight, body fat percentage, body fat mass and L1 subcutaneous fat area.

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The Influence of Sport Nutrition Knowledge on Body Composition and Perceptions of Dietary Requirements in Collegiate Athletes

10.20944/preprints202105.0505.v1 ◽

2021 ◽

Author(s):

Andrew Jagim ◽

Jennifer B. Fields ◽

Meghan Magee ◽

Chad Kerksick ◽

Joel Luedke ◽

...

Keyword(s):

Body Composition ◽

Body Weight ◽

Body Mass ◽

Body Fat ◽

Fat Mass ◽

Collegiate Athletes ◽

Nutrition Knowledge ◽

Fat Free Mass ◽

Sport Nutrition ◽

Division Iii

Sport nutrition knowledge has been shown to influence dietary habits of athletes. The purpose of the current study was to examine relationships between sport nutrition knowledge and body composition and examine potential predictors of body weight goal in collegiate athletes. Participants included National Collegiate Athletic Association Division III women (n=42, height: 169.9 ± 6.9 cm; body mass: 67.1 ± 8.6 kg; fat-free mass: 51.3 ± 6.6 kg; body fat %: 24.2 ± 5.3%) and men (n=25, height: 180.8 ± 7.2 cm; body mass: 89.2 ± 20.5 kg; fat-free mass: 75.9 ± 12.2 kg; body fat %: 13.5 ± 8.9%) athletes. Body composition was assessed via air displacement plethysmography. Athletes completed a validated questionnaire designed to assess sport nutrition knowledge and were asked questions about their perceived dietary energy and macronutrient requirements, as well as their body weight goal (i.e. lose, maintain, gain weight). Athletes answered 47.98 ± 11.29 % of questions correctly on the nutrition questionnaire with no differences observed between sexes (men: 49.52 ± 11.76% vs. women: 47.03 ± 11.04%; p=0.40). An inverse relationship between sport nutrition knowledge scores and body fat percentage (r = -0.330; p=0.008), and fat mass (r = -.268; p=0.032) was observed for all athletes. Fat mass (β = 0.224), BF % (β = 0.217), and BMI (β = 0.421) were all significant (p&lt;0.05) predictors of body weight goal in women. All athletes significantly (p&lt;0.001) underestimated daily energy (-1,360 ± 610.2 kcal/d), carbohydrate (-301.6 ± 149.2 g/d), and fat (-41.4 ± 34.5 g/d) requirements. Division III collegiate athletes have a low level of sport nutrition knowledge, which was associated with a higher BF %. Women athletes with a higher body weight, BF % and BMI were more likely to select weight loss as a body weight goal. Athletes also significantly underestimated their energy and carbohydrate requirements based upon the demands of their sport, independent of sex.

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Walking at speeds close to the preferred transition speed as an approach to obesity treatment

Srpski arhiv za celokupno lekarstvo ◽

10.2298/sarh1202058i ◽

2012 ◽

Vol 140 (1-2) ◽

pp. 58-64 ◽

Cited By ~ 4

Author(s):

Dusko Ilic ◽

Vladimir Ilic ◽

Vladimir Mrdakovic ◽

Nenad Filipovic

Keyword(s):

Weight Loss ◽

Body Weight ◽

Fat Mass ◽

Repeated Measures ◽

Fat Free Mass ◽

Exercise Protocol ◽

Significant Group ◽

Functional Changes ◽

Transition Speed ◽

Preferred Transition Speed

Introduction. Increasing energy expenditure through certain exercise is an important component of effective interventions to enhance initial weight loss and prevent weight regain. Objective. The purpose of this study was to determine the effect of a 16-week weight loss exercise programme on morpho-functional changes in female adults and to examine the programme effects on two subpopulations with different levels of obesity. Methods. Fifty-six middle-aged women were divided into 2 groups according to their body mass index (BMI): 25-29.9 kg/m2 - overweight (OW) and ?30 kg/m2 - obese (OB). The exercise protocol included a walking technique based on hip rotation at horizontal plane at speeds close to the preferred transition speed (PTS). At the initiation of the study and after 16 weeks of the programme, anthropometric, morphological and cardiovascular parameters of all subjects were assessed. The main effects of Group (OW and OB) and Time and the interaction effect of Group by Time were tested by time repeated measures General Linear Model (mixed between-within subjects ANOVA). Results. Mean weight loss during the programme was 10.3 kg and 20.1 kg in OW and OB, respectively. The average fat mass (FM) loss was 9.4 kg in OW and 16.9 kg in OB. The Mixed ANOVA revealed a significant Group by Time interaction effects for waist circumference, body weight, body water, fat free mass, FM, %FM and BMI (p<0.05). Conclusion. The applied exercise protocol has proved as beneficial in the treatment of obesity, since it resulted in a significant weight loss and body composition changes. The reduction in body weight was achieved mainly on account of the loss of fat mass.

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The Influence of Sport Nutrition Knowledge on Body Composition and Perceptions of Dietary Requirements in Collegiate Athletes

Nutrients ◽

10.3390/nu13072239 ◽

2021 ◽

Vol 13 (7) ◽

pp. 2239

Author(s):

Andrew R. Jagim ◽

Jennifer B. Fields ◽

Meghan Magee ◽

Chad Kerksick ◽

Joel Luedke ◽

...

Keyword(s):

Body Composition ◽

Body Weight ◽

Body Mass ◽

Body Fat ◽

Fat Mass ◽

Collegiate Athletes ◽

Nutrition Knowledge ◽

Fat Free Mass ◽

Sport Nutrition ◽

Division Iii

Sport nutrition knowledge has been shown to influence dietary habits of athletes. The purpose of the current study was to examine relationships between sport nutrition knowledge and body composition and examine potential predictors of body weight goals in collegiate athletes. Participants included National Collegiate Athletic Association Division III women (n = 42, height: 169.9 ± 6.9 cm; body mass: 67.1 ± 8.6 kg; fat-free mass: 51.3 ± 6.6 kg; body fat per cent: 24.2 ± 5.3%) and men (n = 25, height: 180.8 ± 7.2 cm; body mass: 89.2 ± 20.5 kg; fat-free mass: 75.9 ± 12.2 kg; body fat per cent: 13.5 ± 8.9%) athletes. Body composition was assessed via air displacement plethysmography. Athletes completed a validated questionnaire designed to assess sport nutrition knowledge and were asked questions about their perceived dietary energy and macronutrient requirements, as well as their body weight goal (i.e., lose, maintain, gain weight). Athletes answered 47.98 ± 11.29% of questions correctly on the nutrition questionnaire with no differences observed between sexes (men: 49.52 ± 11.76% vs. women: 47.03 ± 11.04%; p = 0.40). An inverse relationship between sport nutrition knowledge scores and body fat percentage (BF%) (r = –0.330; p = 0.008), and fat mass (r = –.268; p = 0.032) was observed for all athletes. Fat mass (β = 0.224), BF% (β = 0.217), and body mass index (BMI) (β = 0.421) were all significant (p < 0.05) predictors of body weight goal in women. All athletes significantly (p < 0.001) underestimated daily energy (–1,360 ± 610.2 kcal/day), carbohydrate (–301.6 ± 149.2 grams/day [g/day]), and fat (–41.4 ± 34.5 g/day) requirements. Division III collegiate athletes have a low level of sport nutrition knowledge, which was associated with a higher BF%. Women athletes with a higher body weight, BF% and BMI were more likely to select weight loss as a body weight goal. Athletes also significantly underestimated their energy and carbohydrate requirements based upon the demands of their sport, independent of sex.

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Methods and Magnitudes of Rapid Weight Loss in Judo Athletes Over Pre-Competition Periods

Human Movement ◽

10.1515/humo-2017-0014 ◽

2017 ◽

Vol 18 (2) ◽

Cited By ~ 2

Author(s):

Rafael Lima Kons ◽

Marina Saldanha Da Silva Athayde ◽

Bruno Follmer ◽

Daniele Detanico

Keyword(s):

Weight Loss ◽

Body Weight ◽

Body Fat ◽

Fluid Intake ◽

Fat Free Mass ◽

Rapid Weight Loss ◽

Southern Brazil ◽

Team Members ◽

Judo Athletes ◽

Anthropometric Assessment

AbstractThe study aimed to analyse the methods and magnitudes of rapid weight loss (RWL) in judo team members in distinct periods before the biggest state competition in Southern Brazil.Twelve male judo athletes took part in the study. The data collection was performed in three periods: (1) three months before the biggest state competition, (2) one week before the competition, (3) the day prior to the event. Anthropometric assessment and the Rapid Weight Loss Questionnaire were performed. Student’sThe main results showed that the majority of athletes reduced 7.1 ± 6.8 kg and started to lose weight to compete 13–16 years earlier. Increasing exercises (91.7%) and restricting fluid intake (41.7%) were the most frequent methods of weight loss. The judo coach/sensei was the person who most influenced the RWL procedure (58.3%). The athletes reduced 5% of their body weight (p < 0.01), 2.4% of their body fat (We conclude that RWL was a common and premature practice in the athletes in the study. The most common methods were increasing exercise volume and restricting fluid and food intake. The coach/sensei was the most influential person in this practice. The judo athletes presented decreases in body fat and fat-free mass during the period prior to the competition.

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A human study to evaluate toxic trace element detoxification, body fat reduction following four-week intake of the Wellnessup diet: a three-arm, randomized clinical trial

10.21203/rs.2.23045/v1 ◽

2020 ◽

Author(s):

Su-Jin Jung ◽

Woo-Lim Kim ◽

Byung-Hyun Park ◽

Seung-Ok Lee ◽

soowan chae

Keyword(s):

Weight Loss ◽

Trace Element ◽

Body Fat ◽

Fat Mass ◽

Fat Free Mass ◽

Control Group ◽

Body Fat Mass ◽

Restricted Diet ◽

Fat Reduction ◽

Toxic Trace Element

Abstract Background: Detox diet are known as a popular dieting strategies that helps toxins elimination and weight manage but there is very little clinical evidence. Methods: To evaluate the effects of 4 week intake of the Wellnessup diet (WD) on toxic trace element detoxification, body fat reduction, and safety parameters. Forty-five women with body mass index (BMI) of 23.5-30 kg/m 2 were recruited. Thirty of them were assigned 1:1 to the test group (WD, 15 subjects) and control group 1 (calorie-restricted diet, CRD, 15 subjects) in a single blind and randomized, and the remaining 15 subjects were assigned to control group 2 (maintaining regular diet, MRD). The primary outcome were toxic trace element levels in hair (29 types of heavy metals), and the secondary outcomes were changes in anthropometric and urinary organic acids. Results: The levels of four toxic trace elements in hair decreased in the WD group after the diet compared to before the diet. Ni, Rh, Sn, and Ga were significantly lower in the WD group than in the CRD or MRD group (p<0.05). A significant weight loss in both groups (WRD:-1.88±0.95kg; p<0.013, CRD:-3.22±0.48kg; p<0.01). The BMI, fat free mass and hip circumference (HC) of the CRD group were not only significantly decreased compared to the WD group but also Weight, BMI. Body fat mass, fat free mass, waist circumference, and HC were significantly decreased (p<0.05) compared to the MRD group, and the weight loss was a greater decrease was observed in the CRD group. No significant changes in any safety parameter were observed. Conclusions: Use of WD might have several beneficial effects and safety such as body fat reduction and improving some the element detoxification through caloric restriction but did not reducing body fat mass more than calorie-restricted diet.

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