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Janse van Mantgem MR, Soors D'Ancona ML, Meyjes M, Van Den Berg LH, Steenhagen E, Kok A, Van Eijk RPA. A comparison between bioelectrical impedance analysis and air-displacement plethysmography in assessing fat-free mass in patients with motor neurone diseases: a cross-sectional study. Amyotroph Lateral Scler Frontotemporal Degener 2024; 25:326-335. [PMID: 38265049 DOI: 10.1080/21678421.2023.2300963] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2023] [Accepted: 12/20/2023] [Indexed: 01/25/2024]
Abstract
AIM To determine the validity of bioelectrical impedance analysis (BIA) in quantifying fat-free mass (FFM) compared to air-displacement plethysmography (ADP) in patients with a motor neurone disease (MND). METHODS FFM of 140 patients diagnosed with MND was determined by ADP using the BodPod (i.e. the gold standard), and by BIA using the whole-body Bodystat. FFM values were translated to predicted resting energy expenditure (REE); the actual REE was measured using indirect calorimetry, resulting in a metabolic index. Validity of the BIA compared to the ADP was assessed using Bland-Altman analysis and Pearson's r. To assess the clinical relevance of differences, we evaluated changes in metabolic index and in individualized protein demand. RESULTS Despite the high correlation between ADP and BIA (r = 0.93), averaged across patients, the assessed mean fat-free mass was 51.7 kg (± 0.9) using ADP and 54.2 kg (± 1.0) using BIA. Hence, BIA overestimated fat-free mass by 2.5 kg (95% CI 1.8-3.2, p < 0.001). Clinically, an increased metabolic index would be more often underdiagnosed in patients with MND using BIA (31.4% according to BIA versus 44.2% according to ADP, p = 0.048). A clinically relevant overestimation of ≥ 15 g in protein demand was observed for 4 (2.9%) patients using BIA. CONCLUSIONS BIA systematically overestimates FFM in patients with MND. Although the differences are limited with ADP, underscoring the utility of BIA for research, overestimation of fat-free mass may have consequences for clinical decision-making, especially when interest lies in determining the metabolic index.
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Affiliation(s)
- Mark R Janse van Mantgem
- Department of Neurology, UMC Utrecht Brain Centre, University Medical Centre Utrecht, Utrecht, The Netherlands
| | - Maaike L Soors D'Ancona
- Department of Neurology, UMC Utrecht Brain Centre, University Medical Centre Utrecht, Utrecht, The Netherlands
- Department of Dietetics, University Medical Centre Utrecht, Utrecht, The Netherlands, and
| | - Myrte Meyjes
- Department of Neurology, UMC Utrecht Brain Centre, University Medical Centre Utrecht, Utrecht, The Netherlands
| | - Leonard H Van Den Berg
- Department of Dietetics, University Medical Centre Utrecht, Utrecht, The Netherlands, and
| | - Elles Steenhagen
- Department of Dietetics, University Medical Centre Utrecht, Utrecht, The Netherlands, and
| | - Annemieke Kok
- Department of Dietetics, University Medical Centre Utrecht, Utrecht, The Netherlands, and
| | - Ruben P A Van Eijk
- Department of Dietetics, University Medical Centre Utrecht, Utrecht, The Netherlands, and
- Biostatistics & Research Support, Julius Centre for Health Sciences and Primary Care, University Medical Centre Utrecht, Utrecht, The Netherlands
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Giovanelli L, Biganzoli G, Spataro A, Malacarne M, Bernardelli G, Spada R, Pagani M, Biganzoli E, Lucini D. Body composition assessment in a large cohort of Olympic athletes with different training loads: possible reference values for fat mass and fat-free mass domains. Acta Diabetol 2024; 61:361-372. [PMID: 37945991 PMCID: PMC10948543 DOI: 10.1007/s00592-023-02203-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/05/2023] [Accepted: 10/12/2023] [Indexed: 11/12/2023]
Abstract
AIMS To assess body composition by means of BOD POD in the large cohort of Italian Olympic athletes of many sport disciplines (studied at the same time), and to provide possible reference values for body composition in elite athletes. METHODS 1556 elite athletes, who took part in the selection procedure for the 2016 Rio Olympic Games for the National Italian Olympic Committee (CONI), were retrospectively studied. Body composition was determined using air plethysmography-based BOD POD. RESULTS We observed that Fat Mass (FM) and Fat-free Mass (FFM) should be considered as two mutually independent domains in elite athletes. By performing Principal Component Analysis, we defined two independent main domains (respectively, representing FM and FFM), which presented different trends according to gender and static or dynamic exercise load. Lastly, we reported possible reference values for FM index and FFM index, respectively, representing the largest contributors to FM domain and FFM domain, and calculated as FM or FFM (kg)/height (m2). CONCLUSIONS Our findings might provide a basis to optimize the practical approach to body composition in athletes, highlighting the importance of considering indicators of fat mass and lean mass "simultaneously" and not specularly, according to different sport disciplines as well. Moreover, these data might contribute to standardize reference values for body composition in elite athletes, with a view to potentially helping to monitor and guide training regimens, prevent related detrimental practices and plan cardiometabolic prevention and rehabilitation programs.
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Affiliation(s)
| | - Giacomo Biganzoli
- Medical Statistics Unit, Department of Biomedical and Clinical Sciences L. Sacco, "Luigi Sacco" University Hospital, University of Milan, Milan, Italy
| | | | | | - Giuseppina Bernardelli
- DISCCO Department, University of Milan, Milan, Italy
- Exercise Medicine Unit, Istituto Auxologico Italiano, IRCCS, Milan, Italy
| | | | - Massimo Pagani
- Exercise Medicine Unit, Istituto Auxologico Italiano, IRCCS, Milan, Italy
| | - Elia Biganzoli
- Medical Statistics Unit, Department of Biomedical and Clinical Sciences L. Sacco, "Luigi Sacco" University Hospital, University of Milan, Milan, Italy
| | - Daniela Lucini
- BIOMETRA Department, University of Milan, Milan, Italy.
- Exercise Medicine Unit, Istituto Auxologico Italiano, IRCCS, Milan, Italy.
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Kranen SH, Oliveira RS, Bond B, Williams CA, Barker AR. The utility of the reperfusion rate of tissue oxygen saturation as a measure of vascular endothelial function in adolescents: reliability, validity and sensitivity. Front Physiol 2023; 14:1163474. [PMID: 37781222 PMCID: PMC10533909 DOI: 10.3389/fphys.2023.1163474] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2023] [Accepted: 08/17/2023] [Indexed: 10/03/2023] Open
Abstract
Introduction: The near-infrared spectroscopy (NIRS)-derived reperfusion rate of tissue oxygen saturation (slope 2 StO2) may provide a surrogate measure of vascular function, however, this has yet to be examined in a paediatric population. This study investigated in adolescents: 1) the between-day reliability of NIRS-derived measurements; 2) the relationship between slope 2 StO2 and macro- (flow-mediated dilation, FMD) and microvascular (peak reactive hyperaemia, PRH) function; and 3) the effect of high-intensity interval exercise (HIIE) on slope 2 StO2, FMD, and PRH. Methods: Nineteen boys (13.3 ± 0.5 y) visited the laboratory on two occasions, separated by ∼ 1 week. On visit 1, participants underwent simultaneous assessment of brachial artery FMD and slope 2 StO2 and PRH on the internal face of the forearm. On visit 2, participants completed a bout of HIIE with slope 2 StO2, FMD and PRH measured pre-, immediately post- and 1.5 h post-exercise. Results: Slope 2 StO2 showed no mean bias (p = 0.18) and an intraclass correlation coefficient of 0.67 (p = 0.003) between visits. No significant correlation between slope 2 StO2 and FMD or PRH was observed on visit 1 (r = -0.04, p = 0.89 and r = -0.30, p = 0.23, respectively) or visit 2 pre-exercise (r = -0.28, p = 0.25 and r = -0.31, p = 0.20, respectively). Compared to pre-exercise, FMD decreased immediately post-exercise (p < 0.001) and then increased 1.5 h post-exercise (p < 0.001). No significant change was detected for slope 2 StO2 (p = 0.30) or PRH (p = 0.55) following HIIE. Conclusion: In adolescents, slope 2 StO2 can be measured reliably, however, it is not correlated with FMD or PRH and does not follow the acute time course of changes in FMD post-exercise. Hence, the use of slope 2 StO2 as a surrogate measure of vascular function in youth must be refuted.
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Affiliation(s)
- Sascha H. Kranen
- Children’s Health and Exercise Research Centre, Public Health and Sports Sciences, University of Exeter Medical School, Faculty of Health and Life Sciences, University of Exeter, Exeter, United Kingdom
| | - Ricardo S. Oliveira
- Children’s Health and Exercise Research Centre, Public Health and Sports Sciences, University of Exeter Medical School, Faculty of Health and Life Sciences, University of Exeter, Exeter, United Kingdom
- Department of Physical Education, Federal University of Rio Grande do Norte, Natal, Brazil
| | - Bert Bond
- Children’s Health and Exercise Research Centre, Public Health and Sports Sciences, University of Exeter Medical School, Faculty of Health and Life Sciences, University of Exeter, Exeter, United Kingdom
| | - Craig A. Williams
- Children’s Health and Exercise Research Centre, Public Health and Sports Sciences, University of Exeter Medical School, Faculty of Health and Life Sciences, University of Exeter, Exeter, United Kingdom
| | - Alan R. Barker
- Children’s Health and Exercise Research Centre, Public Health and Sports Sciences, University of Exeter Medical School, Faculty of Health and Life Sciences, University of Exeter, Exeter, United Kingdom
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Chen F, Wu L, Chen Y, Wang J, Liu J, Huang G, Hou D, Liao Z, Zhang T, Xie X, Liu G. A comparison of bioelectrical impedance analysis and air displacement plethysmography to assess body composition in children. Front Public Health 2023; 11:1164556. [PMID: 37469700 PMCID: PMC10352489 DOI: 10.3389/fpubh.2023.1164556] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2023] [Accepted: 06/13/2023] [Indexed: 07/21/2023] Open
Abstract
Background Accurate assessment of body composition (BC) is important to investigate the development of childhood obesity. A bioelectrical impedance analysis (BIA) device is portable and inexpensive compared with air displacement plethysmography (ADP) for the assessment of BC and is widely used in children. However, studies of the effectiveness of BIA are few and present different results, especially in pediatric populations. The aim of this study was to evaluate the agreement between BIA and ADP for estimating BC. Methods The BC of 981 Chinese children (3-5 years) was measured using the BIA device (SeeHigher BAS-H, China) and ADP (BOD POD). Results Our results showed that BIA underestimated fat mass (FM) and overestimated fat-free mass (FFM) in normal weight children (P < 0.05), but the opposite trend was shown in children with obesity (P < 0.05). The agreement between FM and FFM measured by the two methods was strong (CCC > 0.80). The linear regression equation of 5-year-old children was constructed. Conclusion The SeeHigher BAS-H multi-frequency BIA device is a valid device to evaluate BC in Chinese preschool children compared with ADP (BOD POD), especially in 5-year-old children or children with obesity. Further research is needed to standardize the assessment of BC in children.
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Affiliation(s)
- Fangfang Chen
- Department of Epidemiology, Capital Institute of Pediatrics, Beijing, China
| | - Lijun Wu
- Department of Epidemiology, Capital Institute of Pediatrics, Beijing, China
| | - Yiren Chen
- Department of Epidemiology, Capital Institute of Pediatrics, Beijing, China
| | - Jing Wang
- Tianjin Women's and Children's Health Center, Tianjin, China
| | - Junting Liu
- Department of Epidemiology, Capital Institute of Pediatrics, Beijing, China
| | - Guimin Huang
- Department of Epidemiology, Capital Institute of Pediatrics, Beijing, China
| | - Dongqing Hou
- Department of Epidemiology, Capital Institute of Pediatrics, Beijing, China
| | - Zijun Liao
- Department of Epidemiology, Capital Institute of Pediatrics, Beijing, China
| | - Ting Zhang
- Department of Epidemiology, Capital Institute of Pediatrics, Beijing, China
| | - Xianghui Xie
- Department of Epidemiology, Capital Institute of Pediatrics, Beijing, China
| | - Gongshu Liu
- Tianjin Women's and Children's Health Center, Tianjin, China
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Kranen SH, Oliveira RS, Bond B, Williams CA, Barker AR. The effect of 4 weeks of high-intensity interval training and 2 weeks of detraining on cardiovascular disease risk factors in male adolescents. Exp Physiol 2023; 108:595-606. [PMID: 36855259 PMCID: PMC10103894 DOI: 10.1113/ep090340] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2022] [Accepted: 01/31/2023] [Indexed: 03/02/2023]
Abstract
NEW FINDINGS What is the central question of this study? What is the effect of 4 weeks of high-intensity interval training (HIIT) and 2 weeks of detraining on vascular function and traditional cardiovascular disease (CVD) risk factors in male adolescents? What is the main finding and its importance? Four weeks of HIIT improved macrovascular function in adolescents. However, this training period did not measurably change microvascular function, body composition or blood biomarkers. Following 2 weeks of detraining, the improvement in flow-mediated dilatation (FMD) was lost. This highlights the importance of the continuation of regular exercise for the primary prevention of CVD. ABSTRACT High-intensity interval training (HIIT) represents an effective method to improve cardiometabolic health in adolescents. This study aimed to investigate the effect of 4 weeks of HIIT followed by 2 weeks of detraining on vascular function and traditional cardiovascular disease (CVD) risk factors in adolescent boys. Nineteen male adolescents (13.3 ± 0.5 years) were randomly allocated to either a training (TRAIN, n = 10) or control (CON, n = 9) group. Participants in TRAIN completed 4 weeks of HIIT running with three sessions per week. Macro- (flow-mediated dilatation, FMD) and microvascular (peak reactive hyperaemia, PRH) function, body composition (fat mass, fat free mass, body fat percentage) and blood biomarkers (glucose, insulin, total cholesterol, high- and low-density lipoprotein, triacylglycerol) were assessed pre-, 48 h post- and 2 weeks post-training for TRAIN and at equivalent time points for CON. Following training, FMD was significantly greater in TRAIN compared to CON (9.88 ± 2.40% and 8.64 ± 2.70%, respectively; P = 0.036) but this difference was lost 2 weeks after training cessation (8.22 ± 2.47% and 8.61 ± 1.99%, respectively; P = 0.062). No differences were detected between groups for PRH (P = 0.821), body composition (all P > 0.14) or blood biomarkers (all P > 0.18). In conclusion, 4 weeks of HIIT improved macrovascular function; however, this training period did not measurably change microvascular function, body composition or blood biomarkers. The reversal of the FMD improvement 2 weeks post-training highlights the importance of the continuation of regular exercise for the primary prevention of CVD.
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Affiliation(s)
- Sascha H. Kranen
- Children's Health and Exercise Research Centre, Public Health and Sports SciencesUniversity of Exeter Medical School, Faculty of Health and Life Sciences, University of ExeterExeterUK
| | - Ricardo S. Oliveira
- Children's Health and Exercise Research Centre, Public Health and Sports SciencesUniversity of Exeter Medical School, Faculty of Health and Life Sciences, University of ExeterExeterUK
- Department of Physical EducationFederal University of Rio Grande do NorteNatalBrazil
| | - Bert Bond
- Children's Health and Exercise Research Centre, Public Health and Sports SciencesUniversity of Exeter Medical School, Faculty of Health and Life Sciences, University of ExeterExeterUK
| | - Craig A. Williams
- Children's Health and Exercise Research Centre, Public Health and Sports SciencesUniversity of Exeter Medical School, Faculty of Health and Life Sciences, University of ExeterExeterUK
| | - Alan R. Barker
- Children's Health and Exercise Research Centre, Public Health and Sports SciencesUniversity of Exeter Medical School, Faculty of Health and Life Sciences, University of ExeterExeterUK
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Abstract
PURPOSE This study aimed to review traditional and new perspectives in the interpretation of the development of youth cardiorespiratory fitness (CRF). METHODS We analyzed data from (i) the literature which for 80 yr has been traditionally based on interpretations of peak oxygen uptake (V˙O2) in ratio with body mass (BM) and (ii) recent multilevel allometric models founded on 994 (475 from girls) determinations of 10- to 16-yr-olds' peak V˙O2 with measures of age, maturity status, and morphological covariates (BM and fat-free mass), and from 10 to 13 yr, 110 peak V˙O2 determinations of maximum cardiovascular covariates (stroke volume, cardiac output, and arteriovenous oxygen difference). RESULTS The application of ratio scaling of physiological variables requires satisfying specific statistical assumptions that are seldom met. In direct conflict with the ratio-scaled data interpretation of CRF, multilevel allometric modeling shows that with BM controlled, peak V˙O2 increases with age but the effect is smaller in girls than boys. Maturity status exerts a positive effect on peak V˙O2, in addition to those of age and BM. Changes in maximum cardiovascular covariates contribute to explaining the development of CRF, but fat-free mass (as a surrogate for active muscle mass) is the most powerful single influence. With age, maturity status, morphological covariates, and maximum cardiovascular covariates controlled, there remains an unexplained ~4% to ~9% sex difference in peak V˙O2. CONCLUSIONS The traditional interpretation of peak V˙O2 in ratio with BM is fallacious and leads to spurious correlations with other health-related variables. Studies of the development of CRF require analyses of sex-specific, concurrent changes in age- and maturation-driven morphological and maximum cardiovascular covariates. Multilevel allometric modeling provides a rigorous, flexible, and sensitive method of data analysis.
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Affiliation(s)
- Neil Armstrong
- Children's Health and Exercise Research Centre, University of Exeter, Exeter, UNITED KINGDOM
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Sex-related differences in accumulated O 2 deficit incurred by high-intensity rowing exercise during childhood and adolescence. Eur J Appl Physiol 2021; 121:1641-1651. [PMID: 33660088 DOI: 10.1007/s00421-021-04636-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2020] [Accepted: 02/08/2021] [Indexed: 10/22/2022]
Abstract
PURPOSE The aims of the present study were to determine during childhood and adolescence (i) the effect of sex on non-oxidative energy production, quantified by the accumulated oxygen deficit (AOD), and (ii) the influence of AOD on high-intensity performance. METHODS Thirty-nine boys and 35 girls aged 10-17 years performed a 60 s all-out test on a rowing ergometer to determine AOD and mean power output (MPO). Multiplicative allometric modelling was used to assess the concurrent effects of lean body mass (LBM) and age on AOD. RESULTS AOD significantly increased with age in both sexes (p < 0.001) with boys exhibiting significantly higher AOD than girls from the age of 14 years (10-11.9 yr: 1.9 vs 1.9 L, 12-13.9 yr: 2.4 vs 2.7 L, 14-15.9 yr: 2.8 vs 4.6 L and 16-17.9 yr: 2.9 vs 5.2 L, in girls and boys respectively, p < 0.001). However, a sex difference was no longer significant when AOD was analysed using an allometric model including age and LBM (p = 0.885). Finally, significant correlations were found between AOD and MPO in boys and girls but with lower evidence in girls (r2 = 0.41 vs. 0.89). CONCLUSION Non-oxidative energy production increased more extensively in boys than girls from the age of 14 years. Age and LBM accounted for the sexual differentiation of AOD during childhood and adolescence. In addition, AOD was found to be a determinant factor of high-intensity performance, more particularly in boys.
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Martinho DV, Baptista R, Teixeira AS, Duarte JP, Valente-Dos-Santos J, Coelho-E-Silva MJ, Santos AMC, Armstrong N. Allometric Scaling of Force-velocity Test Output Among Pre-pubertal Basketball Players. Int J Sports Med 2021; 42:994-1003. [PMID: 33621996 DOI: 10.1055/a-1327-2727] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Basketball is characterized by high-intensity episodes predominantly reliant on anaerobic metabolism. The force-velocity test enables individual determination of an optimal braking force and emerged as appropriate to estimate optimal peak power. It has rarely been used in youth basketball. This study aimed to examine the contribution of body size, composition, and biological maturation to interindividual variation in force-velocity test output among pre-pubertal basketball players. The sample consisted of 64 male participants (8.4-12.3 years). Stature, sitting height, body mass and two skinfolds were measured, and leg length estimated. Fat-free mass and lower limb volume were estimated from anthropometry. Age at peak height velocity was predicted from maturity offset. Optimal peak power was correlated with all body size descriptors (correlation: 0.541-0.700). Simple allometric models explained 30-47% of inter-individual variance, with fat-free mass being the best predictor of performance. Whole-body fat-free mass (as a surrogate for active muscle mass) plus the indicator of maturation emerged as the best proportional allometric model (53% explained variance). Even at pre-pubertal ages, the interpretation of the force-velocity test requires assessing the metabolically active component of body mass.
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Affiliation(s)
- Diogo V Martinho
- University of Coimbra, FCDEF, Coimbra, Portugal.,University of Coimbra, CIDAF (uid/dtp/04213/2020), Coimbra, Portugal
| | | | - Anderson S Teixeira
- Research Group for Development of Football and Futsal / Physical Effort Laboratory, Federal University of Santa Catarina, Florianopolis, Brazil
| | - Joao P Duarte
- University of Coimbra, FCDEF, Coimbra, Portugal.,University of Coimbra, CIDAF (uid/dtp/04213/2020), Coimbra, Portugal
| | - Joao Valente-Dos-Santos
- University of Coimbra, CIDAF (uid/dtp/04213/2020), Coimbra, Portugal.,Lusófona University, Faculty of Physical Education and Sport, Lisbon, Portugal
| | - Manuel J Coelho-E-Silva
- University of Coimbra, FCDEF, Coimbra, Portugal.,University of Coimbra, CIDAF (uid/dtp/04213/2020), Coimbra, Portugal
| | | | - Neil Armstrong
- Children's Health and Exercise Research Centre, University of Exeter, Exeter, United Kingdom of Great Britain and Northern Ireland
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Armstrong N, Welsman J. Influence of sex-specific concurrent changes in age, maturity status, and morphological covariates on the development of peak ventilatory variables in 10-17-year-olds. Eur J Appl Physiol 2020; 121:783-792. [PMID: 33289062 PMCID: PMC7892727 DOI: 10.1007/s00421-020-04569-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Accepted: 11/21/2020] [Indexed: 11/30/2022]
Abstract
Purposes (i) To investigate the influence of concurrent changes in age, maturity status, stature, body mass, and skinfold thicknesses on the development of peak ventilatory variables in 10–17-year-olds; and, (ii) to evaluate the interpretation of paediatric norm tables of peak ventilatory variables. Methods Multiplicative multilevel modelling which allows both the number of observations per individual and the temporal spacing of the observations to vary was used to analyze the expired ventilation (peak \documentclass[12pt]{minimal}
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\begin{document}$${\dot{\mathrm{V}}}_{\mathrm{E}}$$\end{document}V˙E) and tidal volume (peak VT) at peak oxygen uptake of 420 (217 boys) 10–17-year-olds. Models were founded on 1053 (550 from boys) determinations of peak ventilatory variables supported by anthropometric measures and maturity status. Results In sex-specific, multiplicative allometric models, concurrent changes in body mass and skinfold thicknesses (as a surrogate of FFM) and age were significant (p < 0.05) explanatory variables of the development of peak \documentclass[12pt]{minimal}
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\begin{document}$${\dot{\mathrm{V}}}_{\mathrm{E}}$$\end{document}V˙E, once these covariates had been controlled for stature had no additional, significant (p > 0.05) effect on peak \documentclass[12pt]{minimal}
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\begin{document}$${\dot{\mathrm{V}}}_{\mathrm{E}}$$\end{document}V˙E. Concurrent changes in age, stature, body mass, and skinfold thicknesses were significant (p < 0.05) explanatory variables of the development of peak VT. Maturity status had no additional, significant (p > 0.05) effect on either peak \documentclass[12pt]{minimal}
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\begin{document}$${\dot{\mathrm{V}}}_{\mathrm{E}}$$\end{document}V˙E or peak VT once age and morphological covariates had been controlled for. Conclusions Elucidation of the sex-specific development of peak \documentclass[12pt]{minimal}
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\begin{document}$${\dot{\mathrm{V}}}_{\mathrm{E}}$$\end{document}V˙E requires studies which address concurrent changes in body mass, skinfold thicknesses, and age. Stature is an additional explanatory variable in the development of peak VT, in both sexes. Paediatric norms based solely on age or stature or body mass are untenable.
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Affiliation(s)
- Neil Armstrong
- Children's Health and Exercise Research Centre, University of Exeter, St Lukes Campus, Heavitree Road, Exeter, EX1 2LU, UK.
| | - Jo Welsman
- Children's Health and Exercise Research Centre, University of Exeter, St Lukes Campus, Heavitree Road, Exeter, EX1 2LU, UK
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Armstrong N, Welsman J. Multilevel allometric modelling of maximum cardiac output, maximum arteriovenous oxygen difference, and peak oxygen uptake in 11-13-year-olds. Eur J Appl Physiol 2020; 120:527-537. [PMID: 31925520 PMCID: PMC6989571 DOI: 10.1007/s00421-020-04300-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2019] [Accepted: 01/02/2020] [Indexed: 11/28/2022]
Abstract
PURPOSES To investigate longitudinally (1) the contribution of morphological covariates to explaining the development of maximum cardiac output ([Formula: see text] max) and maximum arteriovenous oxygen difference (a-vO2 diff max), (2) sex differences in [Formula: see text] max and a-vO2 diff max once age, maturity status, and morphological covariates have been controlled for, and, (3) the contribution of concurrent changes in morphological and cardiovascular covariates to explaining the sex-specific development of peak oxygen uptake ([Formula: see text]). METHODS Fifty-one (32 boys) 11-13-year-olds had their peak [Formula: see text], maximum heart rate (HR max), [Formula: see text] max, and a-vO2 diff max determined during treadmill running on three annual occasions. The data were analysed using multilevel allometric modelling. RESULTS There were no sex differences in HR max which was not significantly (p > 0.05) correlated with age, morphological variables, or peak [Formula: see text]. The best-fit models for [Formula: see text] max and a-vO2 diff max were with fat-free mass (FFM) as covariate with age, maturity status, and haemoglobin concentration not significant (p > 0.05). FFM was the dominant influence on the development of peak [Formula: see text]. With FFM controlled for, the introduction of either [Formula: see text] max or a-vO2 diff max to multilevel models of peak [Formula: see text] resulted in significant (p < 0.05) additional contributions to explaining the sex difference. CONCLUSIONS (1) With FFM controlled for, there were no sex differences in [Formula: see text] max or a-vO2 diff max, (2) FFM was the dominant influence on the development of peak [Formula: see text], and (3) with FFM and either [Formula: see text] max or a-vO2 diff max controlled for, there remained an unresolved sex difference of ~ 4% in peak [Formula: see text].
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Affiliation(s)
- Neil Armstrong
- Children’s Health and Exercise Research Centre, University of Exeter, St Lukes Campus, Heavitree Road, Exeter, EX1 2LU UK
| | - Jo Welsman
- Children’s Health and Exercise Research Centre, University of Exeter, St Lukes Campus, Heavitree Road, Exeter, EX1 2LU UK
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Armstrong N, Welsman J. Multilevel allometric modelling of maximal stroke volume and peak oxygen uptake in 11-13-year-olds. Eur J Appl Physiol 2019; 119:2629-2639. [PMID: 31624950 PMCID: PMC6858397 DOI: 10.1007/s00421-019-04241-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2019] [Accepted: 10/09/2019] [Indexed: 11/25/2022]
Abstract
PURPOSE To investigate (1) whether maximal stroke volume (SVmax) occurs at submaximal exercise intensities, (2) sex differences in SVmax once fat-free mass (FFM) has been controlled for, and, (3) the contribution of concurrent changes in FFM and SVmax to the sex-specific development of peak oxygen uptake [Formula: see text]. METHODS The peak [Formula: see text] s of 61 (34 boys) 11-12-year-olds were determined and their SV determined during treadmill running at 2.28 and 2.50 m s-1 using carbon dioxide rebreathing. The SVmax and peak [Formula: see text] of 51 (32 boys) students who volunteered to be tested treadmill running at 2.50 m s-1 on three annual occasions were investigated using multilevel allometric modelling. The models were founded on 111 (71 from boys) determinations of SVmax, FFM, and peak [Formula: see text]. RESULTS Progressive increases in treadmill running speed resulted in significant (p < 0.01) increases in [Formula: see text], but SV levelled-off with nonsignificant (p > 0.05) changes within ~ 2-3%. In the multilevel models, SVmax increased proportionally to FFM0.72 and with FFM controlled for, there were no significant (p > 0.05) sex differences. Peak [Formula: see text] increased with FFM but after adjusting for FFM0.98, a significant (p < 0.05) sex difference in peak [Formula: see text] remained. Introducing SVmax to the multilevel model revealed a significant (p < 0.05), but small additional effect of SVmax on peak [Formula: see text]. CONCLUSIONS Fat-free mass explained sex differences in SVmax, but with FFM controlled for, there was still a ~ 5% sex difference in peak [Formula: see text]. SVmax made a modest additional contribution to explain the development of peak [Formula: see text] but there remained an unresolved sex difference of ~ 4%.
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Affiliation(s)
- Neil Armstrong
- Children’s Health and Exercise Research Centre, University of Exeter, St Lukes Campus, Heavitree Road, Exeter, EX1 2LU UK
| | - Jo Welsman
- Children’s Health and Exercise Research Centre, University of Exeter, St Lukes Campus, Heavitree Road, Exeter, EX1 2LU UK
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12
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Pineau JC, Bouslah M. Prediction of body fat in male athletes from ultrasound and anthropometric measurements versus DXA. J Sports Med Phys Fitness 2019; 60:251-256. [PMID: 31663316 DOI: 10.23736/s0022-4707.19.09985-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
BACKGROUND To compare the accuracy of body fat percentage (BF%) measured by an ultrasound portable device and anthropometric measurements with a Dual energy X-ray absorptiometry (DXA) as the reference technique in male athletes. METHODS A total of 100 athletes: 16 boxers, 4 rowers, 5 gymnasts, 6 base ball players, 19 judo players, 10 taekwondo players, 7 basket-ball players, 21 wrestlers, 6 cyclists on track and 6 karate expert aged from 18 to 30 years participated. All athletes were selected from the French National Institute of Sports and Physical Education. Ultrasound measurements were made with a sonographic US BOX at the mid-thigh level. We developed a multi -linear model of body fat estimation from ultrasound and anthropometric dimensions (height, weight, waist circumference) using the DXA reference method. A cross-validation study was then performed with this linear regression on 62 males athletes proportionally stratified across the sports. RESULTS The best accuracy of BF was obtained using a multi-linear model from ultrasonic and anthropometric measurements with a concordance correlation ρc=0.941. This model was then used to estimate BF on the 62 males athletes. The concordance correlation ρc=0.931 and SEE=1.60. The 95% limits of agreement for individual BF% were [-4.1;3.6%] with symmetrically distributed deviations. CONCLUSIONS Comparing to DXA, ultrasonic and anthropometric measurements are both accurate techniques to estimates BF%. Our results suggest that this regression model is practical to apply to different sports.
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Affiliation(s)
- Jean-Claude Pineau
- Faculty of Dental Surgery, Paris-Descartes University, Montrouge, France -
| | - Mustapha Bouslah
- Faculty of Dental Surgery, Paris-Descartes University, Montrouge, France
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13
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Armstrong N, Welsman J, Bloxham S. Development of 11- to 16-year-olds' short-term power output determined using both treadmill running and cycle ergometry. Eur J Appl Physiol 2019; 119:1565-1580. [PMID: 31028467 PMCID: PMC6570681 DOI: 10.1007/s00421-019-04146-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2019] [Accepted: 04/17/2019] [Indexed: 11/30/2022]
Abstract
PURPOSE To investigate the development of peak power output (PP) and mean power output (MP) during two different modes of exercise in relation to sex and concurrent changes in age, body mass, fat-free mass (FFM), maturity status and, in the case of MP, peak oxygen uptake ([Formula: see text]). METHODS PP and MP were determined cycling against a fixed braking force (Wingate anaerobic test) and running on a non-motorized treadmill. Peak [Formula: see text] was determined using cycle ergometry and treadmill running. 135 (63 girls) students initially aged 11-14 years were tested over 2 days on three annual occasions. The data were analysed using multiplicative allometric modelling which enables the effects of variables to be partitioned concurrently within an allometric framework. Multiplicative models were founded on 301 (138 from girls) determinations of PP and MP on each ergometer. RESULTS With body mass controlled for, both PP and MP increased with age but maturity status did not independently contribute to any of the multiplicative allometric models. Boys' PP and MP were significantly (p < 0.05) higher than girls' values on both ergometers. On both ergometers in both sexes, the most powerful morphological influence on PP and MP was FFM. Ergometer-specific peak [Formula: see text] had a significant (p < 0.05), additional effect in explaining the development of MP. CONCLUSIONS The development of short-term power output is sex specific but within sex multiplicative allometric models of running- and cycling-determined PP and MP were similar, suggesting that either mode of exercise can be used in future studies of short-term power output in youth.
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Affiliation(s)
- Neil Armstrong
- Children’s Health and Exercise Research Centre, University of Exeter, St Lukes Campus, Exeter, EX1 2LU UK
| | - Jo Welsman
- Children’s Health and Exercise Research Centre, University of Exeter, St Lukes Campus, Exeter, EX1 2LU UK
| | - Saul Bloxham
- School of Sport, Health and Well Being, Plymouth Marjon University, Derriford Road, Plymouth, PL6 8BH UK
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14
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Abstract
Purpose: To investigate peak oxygen uptake ( V˙O2 ) in relation to sex, age, body mass, fat-free mass (FFM), maturity, and overweight status. Methods: Multiplicative, allometric models of 10- to 18-year-olds were founded on 1057 determinations of peak V˙O2 supported by anthropometry and estimates of maturity status. Results: Baseline models with body mass controlled for showed age to exert a positive effect on peak V˙O2 , with negative estimates for age2, sex, and a sex-by-age interaction. Sex-specific models showed maturity status to have a positive effect on peak V˙O2 in addition to the effects of age and body mass. Introducing skinfold thicknesses to provide, with body mass, a surrogate for FFM explained maturity effects and yielded a significantly (P < .05) better statistical fit in all models compared with those based on FFM estimated from youth-specific skinfold equations. With girls only, the introduction of overweight, defined by body mass index, resulted in a small but significant (P < .05) negative effect, with an age-by-overweight status interaction. Conclusions: FFM has a powerful influence on peak V˙O2 in both sexes. Interpretation of the development of youth aerobic fitness and its application to health should reflect the sex- and maturity-associated variation in FFM.
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Armstrong N, Welsman J. Development of peak oxygen uptake from 11-16 years determined using both treadmill and cycle ergometry. Eur J Appl Physiol 2019; 119:801-812. [PMID: 30627827 PMCID: PMC6394694 DOI: 10.1007/s00421-019-04071-3] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2018] [Accepted: 01/03/2019] [Indexed: 11/12/2022]
Abstract
PURPOSES To investigate the development of peak oxygen uptake ([Formula: see text]) assessed on both a treadmill and a cycle ergometer in relation with sex and concurrent changes in age, body mass, fat-free mass (FFM), and maturity status and to evaluate currently proposed 'clinical red flags' or health-related cut-points for peak [Formula: see text]. METHODS Multiplicative multilevel modelling, which enables the effects of variables to be partitioned concurrently within an allometric framework, was used to analyze the peak [Formula: see text]s of 138 (72 boys) students initially aged 11-14 years and tested on three annual occasions. Models were founded on 640 (340 from boys) determinations of peak [Formula: see text], supported by anthropometric measures and maturity status. RESULTS Mean peak [Formula: see text]s were 11-14% higher on a treadmill. The data did not meet the statistical assumptions underpinning ratio scaling of peak [Formula: see text] with body mass. With body mass appropriately controlled for boys' peak [Formula: see text]s were higher than girls' values and the difference increased with age. The development of peak [Formula: see text] was sex-specific, but within sex models were similar on both ergometers with FFM the dominant anthropometric factor. CONCLUSIONS Data should not be pooled for analysis but data from either ergometer can be used independently to interpret the development of peak [Formula: see text] in youth. On both ergometers and in both sexes, FFM is the most powerful morphological influence on the development of peak [Formula: see text]. 'Clinical red flags' or health-related cut-points proposed without consideration of exercise mode and founded on peak [Formula: see text] in ratio with body mass are fallacious.
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Affiliation(s)
- Neil Armstrong
- Children’s Health and Exercise Research Centre, University of Exeter, St Lukes Campus, Heavitree Road, Exeter, EX1 2LU UK
| | - Jo Welsman
- Children’s Health and Exercise Research Centre, University of Exeter, St Lukes Campus, Heavitree Road, Exeter, EX1 2LU UK
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16
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Christensen P, Meinert Larsen T, Westerterp‐Plantenga M, Macdonald I, Martinez JA, Handjiev S, Poppitt S, Hansen S, Ritz C, Astrup A, Pastor‐Sanz L, Sandø‐Pedersen F, Pietiläinen KH, Sundvall J, Drummen M, Taylor MA, Navas‐Carretero S, Handjieva‐Darlenska T, Brodie S, Silvestre MP, Huttunen‐Lenz M, Brand‐Miller J, Fogelholm M, Raben A. Men and women respond differently to rapid weight loss: Metabolic outcomes of a multi-centre intervention study after a low-energy diet in 2500 overweight, individuals with pre-diabetes (PREVIEW). Diabetes Obes Metab 2018; 20:2840-2851. [PMID: 30088336 PMCID: PMC6282840 DOI: 10.1111/dom.13466] [Citation(s) in RCA: 117] [Impact Index Per Article: 19.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/08/2018] [Revised: 06/28/2018] [Accepted: 07/06/2018] [Indexed: 12/12/2022]
Abstract
AIMS The PREVIEW lifestyle intervention study (ClinicalTrials.gov Identifier: NCT01777893) is, to date, the largest, multinational study concerning prevention of type-2 diabetes. We hypothesized that the initial, fixed low-energy diet (LED) would induce different metabolic outcomes in men vs women. MATERIALS AND METHODS All participants followed a LED (3.4 MJ/810 kcal/daily) for 8 weeks (Cambridge Weight Plan). Participants were recruited from 8 sites in Europe, Australia and New Zealand. Those eligible for inclusion were overweight (BMI ≥ 25 kg/m2 ) individuals with pre-diabetes according to ADA-criteria. Outcomes of interest included changes in insulin resistance, fat mass (FM), fat-free mass (FFM) and metabolic syndrome Z-score. RESULTS In total, 2224 individuals (1504 women, 720 men) attended the baseline visit and 2020 (90.8%) completed the follow-up visit. Following the LED, weight loss was 16% greater in men than in women (11.8% vs 10.3%, respectively) but improvements in insulin resistance were similar. HOMA-IR decreased by 1.50 ± 0.15 in men and by 1.35 ± 0.15 in women (ns). After adjusting for differences in weight loss, men had larger reductions in metabolic syndrome Z-score, C-peptide, FM and heart rate, while women had larger reductions in HDL cholesterol, FFM, hip circumference and pulse pressure. Following the LED, 35% of participants of both genders had reverted to normo-glycaemia. CONCLUSIONS An 8-week LED induced different effects in women than in men. These findings are clinically important and suggest gender-specific changes after weight loss. It is important to investigate whether the greater decreases in FFM, hip circumference and HDL cholesterol in women after rapid weight loss compromise weight loss maintenance and future cardiovascular health.
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Affiliation(s)
- Pia Christensen
- Department of Nutrition, Exercise and SportsUniversity of CopenhagenCopenhagenDenmark
| | - Thomas Meinert Larsen
- Department of Nutrition, Exercise and SportsUniversity of CopenhagenCopenhagenDenmark
| | | | - Ian Macdonald
- MRC/ARUK Centre for Musculoskeletal Ageing Research, National Institute for Health Research (NIHR) Nottingham Biomedical Research CentreSchool of Life SciencesUniversity of Nottingham, NottinghamNG7 2UH, UK
| | - J. Alfredo Martinez
- Department of Nutrition, Food Science and Physiology, Center for Nutrition ResearchUniversity of NavarraPamplonaSpain
- CIBERObn, Obesity and NutritionInstituto de Salud Carlos IIIMadridSpain
- IMDEA AlimentaciónMadridSpain
| | - Svetoslav Handjiev
- Department of Pharmacology and ToxicologyMedical University of SofiaSofiaBulgaria
| | - Sally Poppitt
- Human Nutrition Unit, School of Biological SciencesUniversity of AucklandAucklandNew Zealand
| | - Sylvia Hansen
- Department of Exercise and Health SciencesUniversity of StuttgartStuttgartGermany
| | - Christian Ritz
- Department of Nutrition, Exercise and SportsUniversity of CopenhagenCopenhagenDenmark
| | - Arne Astrup
- Department of Nutrition, Exercise and SportsUniversity of CopenhagenCopenhagenDenmark
| | - Laura Pastor‐Sanz
- Department of Nutrition, Exercise and SportsUniversity of CopenhagenCopenhagenDenmark
| | - Finn Sandø‐Pedersen
- Department of Nutrition, Exercise and SportsUniversity of CopenhagenCopenhagenDenmark
| | - Kirsi H. Pietiläinen
- Obesity Research Unit, Research Program Unit, Diabetes and ObesityUniversity of HelsinkiHelsinkiFinland
- Obesity Center, Abdominal Center, EndocrinologyHelsinki University Hospital, University of HelsinkiHelsinkiFinland
| | - Jouko Sundvall
- National Institute for Health and Welfare THLHelsinkiFinland
| | - Mathijs Drummen
- Department of Nutrition and Movement Sciences, School for Nutrition and Translational Research in MetabolismMaastricht UniversityMaastrichtThe Netherlands
| | | | - Santiago Navas‐Carretero
- Department of Nutrition, Food Science and Physiology, Center for Nutrition ResearchUniversity of NavarraPamplonaSpain
- CIBERObn, Obesity and NutritionInstituto de Salud Carlos IIIMadridSpain
| | | | - Shannon Brodie
- Charles Perkins Centre and School of Life and Environmental BiosciencesUniversity of SydneySydneyAustralia
| | - Marta P. Silvestre
- Human Nutrition Unit, School of Biological SciencesUniversity of AucklandAucklandNew Zealand
| | - Maija Huttunen‐Lenz
- Department of Exercise and Health SciencesUniversity of StuttgartStuttgartGermany
| | - Jennie Brand‐Miller
- Charles Perkins Centre and School of Life and Environmental BiosciencesUniversity of SydneySydneyAustralia
| | - Mikael Fogelholm
- Department of Food and NutritionUniversity of HelsinkiHelsinkiFinland
| | - Anne Raben
- Department of Nutrition, Exercise and SportsUniversity of CopenhagenCopenhagenDenmark
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Fields JB, Merrigan JJ, White JB, Jones MT. Body Composition Variables by Sport and Sport-Position in Elite Collegiate Athletes. J Strength Cond Res 2018; 32:3153-3159. [DOI: 10.1519/jsc.0000000000002865] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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18
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Fields JB, Merrigan JJ, White JB, Jones MT. Seasonal and Longitudinal Changes in Body Composition by Sport-Position in NCAA Division I Basketball Athletes. Sports (Basel) 2018; 6:sports6030085. [PMID: 30135356 PMCID: PMC6162457 DOI: 10.3390/sports6030085] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2018] [Revised: 08/17/2018] [Accepted: 08/20/2018] [Indexed: 02/03/2023] Open
Abstract
The purpose of this study was to assess the body composition of male and female basketball athletes (n = 323) across season, year, and sport-position using air displacement plethysmography. An independent sample t-test assessed sport-position differences. An analysis of variance was used to assess within-subjects across season (pre-season, in-season, and off-season), and academic year (freshman, sophomore, and junior). For both men and women basketball (MBB, WBB) athletes, guards had the lowest body fat, fat mass, fat free mass, and body mass. No seasonal differences were observed in MBB, but following in-season play for WBB, a reduction of (p = 0.03) in fat free mass (FFM) was observed. Across years, MBB showed an increase in FFM from freshman to sophomore year, yet remained unchanged through junior year. For WBB across years, no differences occurred for body mass (BM), body fat (BF%), and fat mass (FM), yet FFM increased from sophomore to junior year (p = 0.009). Sport-position differences exist in MBB and WBB: Guards were found to be smaller and leaner than forwards. Due to the importance of body composition (BC) on athletic performance, along with seasonal and longitudinal shifts in BC, strength and conditioning practitioners should periodically assess athletes BC to ensure preservation of FFM. Training and nutrition programming can then be adjusted in response to changes in BC.
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Affiliation(s)
- Jennifer B Fields
- Frank Pettrone Center for Sports Performance, George Mason University, Fairfax, VA 22030, USA.
- Division of Health and Human Performance, George Mason University, Manassas, VA 20110, USA.
| | - Justin J Merrigan
- Frank Pettrone Center for Sports Performance, George Mason University, Fairfax, VA 22030, USA.
- Division of Health and Human Performance, George Mason University, Manassas, VA 20110, USA.
| | - Jason B White
- Frank Pettrone Center for Sports Performance, George Mason University, Fairfax, VA 22030, USA.
- Division of Health and Human Performance, George Mason University, Manassas, VA 20110, USA.
| | - Margaret T Jones
- Frank Pettrone Center for Sports Performance, George Mason University, Fairfax, VA 22030, USA.
- Division of Health and Human Performance, George Mason University, Manassas, VA 20110, USA.
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