1
|
W Constantini N, Alves E, L Mountjoy M, E Ackerman K. Relative energy deficiency in military (RED-M). BMJ Mil Health 2024; 170:191-192. [PMID: 36702526 DOI: 10.1136/military-2022-002341] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/15/2023] [Indexed: 01/27/2023]
Affiliation(s)
- Naama W Constantini
- Orthopaedics, Heidi Rothberg Sport Medicine Center, Jerusalem, Israel
- Cardiology, Shaare Zedek Medical Center, Jerusalem, Israel
| | - E Alves
- Medicina Física e de Reabilitação, Centro Hospitalar Universitário de Lisboa Norte EPE, Lisboa, Portugal
| | - M L Mountjoy
- Family Medicine, McMaster University Michael G DeGroote School of Medicine, Hamilton, Ontario, Canada
- International Olympic Committee Games Group, Lausanne, Switzerland
| | - K E Ackerman
- Wu Tsai Female Athlete Program, Boston, Massachusetts, USA
- Sports Medicine, Boston Children's Hospital, Boston, Massachusetts, USA
| |
Collapse
|
2
|
Charlot K, Coca M, Colin P, Tavard B, Bourrilhon C. Evaluation of the efficacy of a light ration adapted to cold weather during a 20-day expedition in Greenland. Physiol Behav 2024; 277:114497. [PMID: 38364985 DOI: 10.1016/j.physbeh.2024.114497] [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: 11/14/2023] [Revised: 01/08/2024] [Accepted: 02/13/2024] [Indexed: 02/18/2024]
Abstract
INTRODUCTION Limiting body mass loss during military expeditions/training in the cold by providing rations containing easy-to-use, highly palatable, and familiar foods is feasible, but the bulk/weight is too high to be realistically used in a military context. We carried out an analysis of lighter rations adapted to cold weather (1,011 g, 15.7 MJ/3750 kcal) during a 20-day expedition in Greenland. METHODS Ten French soldiers daily reported all foods and beverages consumed, the reasons they did not consume certain foods, the palatability of each consumed food, the timing of intake, and the sensation of hunger using a diary. RESULTS Although energy intake increased in the 3rd week (vs 1st week; p = 0.015), it was insufficient to prevent the loss of body mass (-4.2 ± 1.9 kg, p = 0.002). More extensive analyses showed that 1) energy intake increased only during dinner (p = 0.024) and that hunger levels continued to increase before dinner (p = 0.029), 2) palatability increased during the 3rd week (vs 1st week) especially for savory day foods (p< 0.001), and 3) lack of hunger and lack of appeal (33 % each) were the main reasons for not consuming certain items. CONCLUSION Soldiers placed in total autonomy during a 20-day expedition in the cold and provided rations that were slightly undersized but adapted for cold conditions, surprisingly, remained picky, leading to large losses of body mass. Our results suggest a margin for improvement to stimulate spontaneous food intake. For example, more energy-dense and savory foods during the day and the replacement of certain disliked items.
Collapse
Affiliation(s)
- Keyne Charlot
- Unité de Physiologie des Exercices et Activités en Conditions Extrêmes, Département Environnements Opérationnels, Institut de Recherche Biomédicale des Armées, 1 place Général Valérie André, 91223 Brétigny Cedex, France; LBEPS, Univ Evry, IRBA, Université Paris Saclay, 91025 Evry, France.
| | - Maxime Coca
- Unité de Physiologie des Exercices et Activités en Conditions Extrêmes, Département Environnements Opérationnels, Institut de Recherche Biomédicale des Armées, 1 place Général Valérie André, 91223 Brétigny Cedex, France; LBEPS, Univ Evry, IRBA, Université Paris Saclay, 91025 Evry, France
| | - Philippe Colin
- Unité de Physiologie des Exercices et Activités en Conditions Extrêmes, Département Environnements Opérationnels, Institut de Recherche Biomédicale des Armées, 1 place Général Valérie André, 91223 Brétigny Cedex, France; LBEPS, Univ Evry, IRBA, Université Paris Saclay, 91025 Evry, France
| | - Blandine Tavard
- Centre Interarmées du Soutien « Equipements Commissariat », Service du commissariat des armées, 78120 Rambouillet, France
| | - Cyprien Bourrilhon
- Unité de Physiologie des Exercices et Activités en Conditions Extrêmes, Département Environnements Opérationnels, Institut de Recherche Biomédicale des Armées, 1 place Général Valérie André, 91223 Brétigny Cedex, France; LBEPS, Univ Evry, IRBA, Université Paris Saclay, 91025 Evry, France
| |
Collapse
|
3
|
Cortez FM, Nunes CL, Sardinha LB, Silva AM, Teixeira VH. The BREAK study protocol: Effects of intermittent energy restriction on adaptive thermogenesis during weight loss and its maintenance. PLoS One 2023; 18:e0294131. [PMID: 37956119 PMCID: PMC10642783 DOI: 10.1371/journal.pone.0294131] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Accepted: 10/18/2023] [Indexed: 11/15/2023] Open
Abstract
BACKGROUND Adaptive thermogenesis, defined as the decrease in the energy expenditure components beyond what can be predicted by changes in body mass stores, has been studied as a possible barrier to weight loss and weight maintenance. Intermittent energy restriction (IER), using energy balance refeeds, has been pointed out as a viable strategy to reduce adaptive thermogenesis and improve weight loss efficiency (greater weight loss per unit of energy deficit), as an alternative to a continuous energy restriction (CER). Following a randomized clinical trial design, the BREAK Study aims to compare the effects of IER versus CER on body composition and in adaptive thermogenesis, and understand whether participants will successfully maintain their weight loss after 12 months. METHODS Seventy-four women with obesity and inactive (20-45 y) will be randomized to 16 weeks of CER or IER (8x2 weeks of energy restriction interspersed with 7x1 week in energy balance). Both groups will start with 2 weeks in energy balance before energy restriction, followed by 16 weeks in energy restriction, then 8 weeks in energy balance and finally a 12-month weight maintenance phase. Primary outcomes are changes in fat-mass and adaptive thermogenesis after weight loss and weight maintenance. Secondary outcomes include weight loss, fat-free mass preservation, alterations in energy expenditure components, and changes in hormones (thyroid function, insulin, leptin, and cortisol). DISCUSSION We anticipate that The BREAK Study will allow us to better understand adaptive thermogenesis during weight loss and weight maintenance, in women with obesity. These findings will enable evidence-based decisions for obesity treatment. TRIAL REGISTRATION ClinicalTrials.gov: NCT05184361.
Collapse
Affiliation(s)
- Filipa M Cortez
- Faculty of Nutrition and Food Sciences, University of Porto, Porto, Portugal
| | - Catarina L Nunes
- Exercise and Health Laboratory, CIPER, Faculty of Human Kinetics, University of Lisbon, Cruz-Quebrada, Portugal
| | - Luís B Sardinha
- Exercise and Health Laboratory, CIPER, Faculty of Human Kinetics, University of Lisbon, Cruz-Quebrada, Portugal
| | - Analiza M Silva
- Exercise and Health Laboratory, CIPER, Faculty of Human Kinetics, University of Lisbon, Cruz-Quebrada, Portugal
| | - Vítor H Teixeira
- Faculty of Nutrition and Food Sciences, University of Porto, Porto, Portugal
- Research Centre of Physical Activity, Health and Leisure, CIAFEL, Faculty of Sport Sciences, University of Porto, Porto, Portugal
- Laboratory for Integrative and Translational Research in Population Health, ITR, Porto, Portugal
- Futebol Clube do Porto, Porto, Portugal
| |
Collapse
|
4
|
Taylor HL, Garabello G, Pugh J, Morton J, Langan-Evans C, Louis J, Borgersen R, Areta JL. Patterns of energy availability of free-living athletes display day-to-day variability that is not reflected in laboratory-based protocols: Insights from elite male road cyclists. J Sports Sci 2022; 40:1849-1856. [PMID: 36062921 DOI: 10.1080/02640414.2022.2115676] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Abstract
The physiological effects of low energy availability (EA) have been studied using a homogenous daily EA pattern in laboratory settings. However, whether this daily EA pattern represents those of free-living athletes and is therefore ecologically valid is unknown. To investigate this, we assessed daily exercise energy expenditure, energy intake and EA in 10 free-living elite male road cyclists (20 min Mean Maximal Power: 5.27 ± 0.25 W · kg-1) during 7 consecutive days of late pre-season training. Energy intake was measured using the remote-food photography method and exercise energy expenditure estimated from cycling crank-based power-metres. Seven-day mean ± SD energy intake and exercise energy expenditure was 57.9 ± 10.4 and 38.4 ± 8.6 kcal · kg FFM-1 · day-1, respectively. EA was 19.5 ± 9.1 kcal · kg FFM-1 · day-1. Within-participants correlation between daily energy intake and exercise energy expenditure was .62 (95% CI: .43 - .75; P < .001), and .60 (95% CI: .41 - .74; P < .001) between carbohydrate intake and exercise energy expenditure. However, energy intake only partially compensated for exercise energy expenditure, increasing 210 kcal · day-1 per 1000 kcal · day-1 increase in expenditure. EA patterns displayed marked day-to-day fluctuation (range: -22 to 76 kcal · kg FFM-1 · day-1). The validity of research using homogenous low EA patterns therefore requires further investigation.
Collapse
Affiliation(s)
- Harry L Taylor
- Research Institute for Sport & Exercise Sciences (RISES), Liverpool John Moores University, Liverpool, UK
| | - Giacomo Garabello
- Research Institute for Sport & Exercise Sciences (RISES), Liverpool John Moores University, Liverpool, UK
| | - Jamie Pugh
- Research Institute for Sport & Exercise Sciences (RISES), Liverpool John Moores University, Liverpool, UK
| | - James Morton
- Research Institute for Sport & Exercise Sciences (RISES), Liverpool John Moores University, Liverpool, UK
| | - Carl Langan-Evans
- Research Institute for Sport & Exercise Sciences (RISES), Liverpool John Moores University, Liverpool, UK
| | - Julien Louis
- Research Institute for Sport & Exercise Sciences (RISES), Liverpool John Moores University, Liverpool, UK
| | | | - Jose L Areta
- Research Institute for Sport & Exercise Sciences (RISES), Liverpool John Moores University, Liverpool, UK
| |
Collapse
|
5
|
Millet J, Siracusa J, Tardo-Dino PE, Thivel D, Koulmann N, Malgoyre A, Charlot K. Effects of Acute Heat and Cold Exposures at Rest or during Exercise on Subsequent Energy Intake: A Systematic Review and Meta-Analysis. Nutrients 2021; 13:nu13103424. [PMID: 34684424 PMCID: PMC8538265 DOI: 10.3390/nu13103424] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Revised: 09/25/2021] [Accepted: 09/27/2021] [Indexed: 02/06/2023] Open
Abstract
The objective of this meta-analysis was to assess the effect of acute heat/cold exposure on subsequent energy intake (EI) in adults. We searched the following sources for publications on this topic: PubMed, Ovid Medline, Science Direct and SPORTDiscus. The eligibility criteria for study selection were: randomized controlled trials performed in adults (169 men and 30 women; 20–52 years old) comparing EI at one or more meals taken ad libitum, during and/or after exposure to heat/cold and thermoneutral conditions. One of several exercise sessions could be realized before or during thermal exposures. Two of the thirteen studies included examined the effect of heat (one during exercise and one during exercise and at rest), eight investigated the effect of cold (six during exercise and two at rest), and three the effect of both heat and cold (two during exercise and one at rest). The meta-analysis revealed a small increase in EI in cold conditions (g = 0.44; p = 0.019) and a small decrease in hot conditions (g = −0.39, p = 0.022) for exposure during both rest and exercise. Exposures to heat and cold altered EI in opposite ways, with heat decreasing EI and cold increasing it. The effect of exercise remains unclear.
Collapse
Affiliation(s)
- Juliette Millet
- Département Environnements Opérationnels, Institut de Recherche Biomédicale des Armées, Unité de Physiologie des Exercices et Activités en Conditions Extrêmes, 91223 Bretigny-Sur-Orge, France; (J.M.); (J.S.); (P.-E.T.-D.); (N.K.); (A.M.)
- LBEPS, Univ Evry, IRBA, Université Paris Saclay, 91025 Evry, France
| | - Julien Siracusa
- Département Environnements Opérationnels, Institut de Recherche Biomédicale des Armées, Unité de Physiologie des Exercices et Activités en Conditions Extrêmes, 91223 Bretigny-Sur-Orge, France; (J.M.); (J.S.); (P.-E.T.-D.); (N.K.); (A.M.)
- LBEPS, Univ Evry, IRBA, Université Paris Saclay, 91025 Evry, France
| | - Pierre-Emmanuel Tardo-Dino
- Département Environnements Opérationnels, Institut de Recherche Biomédicale des Armées, Unité de Physiologie des Exercices et Activités en Conditions Extrêmes, 91223 Bretigny-Sur-Orge, France; (J.M.); (J.S.); (P.-E.T.-D.); (N.K.); (A.M.)
- LBEPS, Univ Evry, IRBA, Université Paris Saclay, 91025 Evry, France
| | - David Thivel
- Laboratory AME2P, University of Clermont Auvergne, 63170 Aubière, France;
| | - Nathalie Koulmann
- Département Environnements Opérationnels, Institut de Recherche Biomédicale des Armées, Unité de Physiologie des Exercices et Activités en Conditions Extrêmes, 91223 Bretigny-Sur-Orge, France; (J.M.); (J.S.); (P.-E.T.-D.); (N.K.); (A.M.)
- LBEPS, Univ Evry, IRBA, Université Paris Saclay, 91025 Evry, France
- Ecole du Val-de-Grâce, 1, Place Alphonse Laveran, 75230 Paris, France
| | - Alexandra Malgoyre
- Département Environnements Opérationnels, Institut de Recherche Biomédicale des Armées, Unité de Physiologie des Exercices et Activités en Conditions Extrêmes, 91223 Bretigny-Sur-Orge, France; (J.M.); (J.S.); (P.-E.T.-D.); (N.K.); (A.M.)
- LBEPS, Univ Evry, IRBA, Université Paris Saclay, 91025 Evry, France
| | - Keyne Charlot
- Département Environnements Opérationnels, Institut de Recherche Biomédicale des Armées, Unité de Physiologie des Exercices et Activités en Conditions Extrêmes, 91223 Bretigny-Sur-Orge, France; (J.M.); (J.S.); (P.-E.T.-D.); (N.K.); (A.M.)
- LBEPS, Univ Evry, IRBA, Université Paris Saclay, 91025 Evry, France
- Correspondence: ; Tel.: +33-(1)78-65-13-03
| |
Collapse
|