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Kraemer RR, Kraemer BR. The effects of peripheral hormone responses to exercise on adult hippocampal neurogenesis. Front Endocrinol (Lausanne) 2023; 14:1202349. [PMID: 38084331 PMCID: PMC10710532 DOI: 10.3389/fendo.2023.1202349] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/08/2023] [Accepted: 11/02/2023] [Indexed: 12/18/2023] Open
Abstract
Over the last decade, a considerable amount of new data have revealed the beneficial effects of exercise on hippocampal neurogenesis and the maintenance or improvement of cognitive function. Investigations with animal models, as well as human studies, have yielded novel understanding of the mechanisms through which endocrine signaling can stimulate neurogenesis, as well as the effects of exercise on acute and/or chronic levels of these circulating hormones. Considering the effects of aging on the decline of specific endocrine factors that affect brain health, insights in this area of research are particularly important. In this review, we discuss how different forms of exercise influence the peripheral production of specific endocrine factors, with particular emphasis on brain-derived neurotrophic factor, growth hormone, insulin-like growth factor-1, ghrelin, estrogen, testosterone, irisin, vascular endothelial growth factor, erythropoietin, and cortisol. We also describe mechanisms through which these endocrine responses to exercise induce cellular changes that increase hippocampal neurogenesis and improve cognitive function.
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Affiliation(s)
- Robert R. Kraemer
- Department of Kinesiology and Health Studies, Southeastern Louisiana University, Hammond, LA, United States
| | - Bradley R. Kraemer
- Department of Biological Sciences, University of Alabama in Huntsville, Huntsville, AL, United States
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Ouerghi N, Feki M, Bragazzi NL, Knechtle B, Hill L, Nikolaidis PT, Bouassida A. Ghrelin Response to Acute and Chronic Exercise: Insights and Implications from a Systematic Review of the Literature. Sports Med 2021; 51:2389-2410. [PMID: 34374968 PMCID: PMC8514378 DOI: 10.1007/s40279-021-01518-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/05/2021] [Indexed: 12/15/2022]
Abstract
BACKGROUND Ghrelin is a peptide hormone predominantly produced by the stomach. It exerts a wide range of functions including stimulating growth hormone release and regulating appetite, food intake, and glucose and lipid metabolism. Since physical exercise affects all these aspects, a particular interest is accorded to the relationship between ghrelin and exercise. This systematic review aimed to summarize the current available data on the topic for a better understanding of the relationship. METHODS An extensive computerized search was performed in the PubMed and SPORTDiscus databases for retrieving relevant articles. The search contained the following keywords: ghrelin, appetite-related peptides, gastrointestinal peptides, gastrointestinal hormones, exercise, acute exercise, chronic exercise, training, and physical activity. Studies investigating the effects of acute/chronic exercise on circulating forms of ghrelin were included. RESULTS The initial search identified 840 articles. After screening, 80 articles were included. Despite a heterogeneity of studies and a variability of the findings, the review suggests that acute exercise suppresses acyl ghrelin production regardless of the participants and the exercise characteristics. Long- and very long-term exercise training programs mostly resulted in increased total and des-acyl ghrelin production. The increase is more noticeable in overweight/obese individuals, and is most likely due to weight loss resulting from the training program. CONCLUSION The review suggests that exercise may impact ghrelin production. While the precise mechanisms are unclear, the effects are likely due to blood flow redistribution and weight loss for acute and chronic exercise, respectively. These changes are expected to be metabolically beneficial. Further research is needed for a better understanding of the relationship between ghrelin and exercise.
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Affiliation(s)
- Nejmeddine Ouerghi
- High Institute of Sport and Physical Education of Kef, UR13JS01, University of Jendouba, 7100, Kef, Tunisia.,Faculty of Medicine of Tunis, Rabta Hospital, LR99ES11, University of Tunis El Manar, 1007, Tunis, Tunisia
| | - Moncef Feki
- Faculty of Medicine of Tunis, Rabta Hospital, LR99ES11, University of Tunis El Manar, 1007, Tunis, Tunisia
| | - Nicola Luigi Bragazzi
- Postgraduate School of Public Health, Department of Health Sciences (DISSAL), University of Genoa, 16132, Genoa, Italy
| | - Beat Knechtle
- Medbase St. Gallen Am Vadianplatz, Vadianstrasse 26, 9001, St. Gallen, Switzerland. .,Institute of Primary Care, University of Zurich, Zurich, Switzerland.
| | - Lee Hill
- Division of Gastroenterology and Nutrition, Department of Pediatrics, McMaster University, Hamilton, L8S 4L8, Canada
| | | | - Anissa Bouassida
- High Institute of Sport and Physical Education of Kef, UR13JS01, University of Jendouba, 7100, Kef, Tunisia
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Levinson CA, Vanzhula IA, Smith TW, Stice E. Group and longitudinal intra-individual networks of eating disorder symptoms in adolescents and young adults at-risk for an eating disorder. Behav Res Ther 2020; 135:103731. [PMID: 33010651 PMCID: PMC7688499 DOI: 10.1016/j.brat.2020.103731] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2019] [Revised: 09/04/2020] [Accepted: 09/16/2020] [Indexed: 12/19/2022]
Abstract
Several studies have identified risk factors that predict future onset of eating disorders (ED) in adolescence, however, it is currently unknown how specific ED symptom dynamics operate both across time and within individuals. Advances in network methodologies allow for the study of how dynamic symptoms interrelate and predict each other within-persons and across time. In the current study, we used longitudinal group-level (N = 1272) (addressing symptom interrelations across people and across time; between-subjects, contemporaneous, and temporal networks) and intra-individual (symptom interrelations within each person and across time; contemporaneous and temporal networks) network analyses (subset n = 50) in prospective 48-month interview data in at-risk adolescents and young adults. We computed between-subject networks (how symptoms are associated on average, for group sample only), contemporaneous networks (how symptoms are associated at one time point, accounting for previous time points), and temporal networks (examining how symptoms predict each other across time). We replicated prior network results which suggest that overvaluation of weight and shape are central in at-risk adolescents and young adults. We found that individual networks (n = 1 networks) were highly variable across individuals. Overall, our results show how both group-level and longitudinal intra-individual network analysis can inform our understanding of how EDs develop in adolescence and point to the importance of conceptualizing development on an individual level of analysis.
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Affiliation(s)
- Cheri A Levinson
- University of Louisville, Department of Psychological & Brain Sciences, Louisville, USA.
| | - Irina A Vanzhula
- University of Louisville, Department of Psychological & Brain Sciences, Louisville, USA
| | - Tosha Woods Smith
- Center of Excellence for Eating Disorders, School of Medicine, University of North Carolina, Chapel Hill, USA
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Tremblay A, Dutheil F, Drapeau V, Metz L, Lesour B, Chapier R, Pereira B, Verney J, Baker JS, Vinet A, Walther G, Obert P, Courteix D, Thivel D. Long-term effects of high-intensity resistance and endurance exercise on plasma leptin and ghrelin in overweight individuals: the RESOLVE Study. Appl Physiol Nutr Metab 2019; 44:1172-1179. [PMID: 30875481 DOI: 10.1139/apnm-2019-0019] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The objective of this study was to evaluate the effects of high-intensity resistance and endurance exercise on body composition and plasma leptin and ghrelin concentrations in overweight individuals. One hundred participants were randomly assigned to 3 exercise interventions: high-resistance-low-aerobic exercise (Re), low-resistance-high-aerobic exercise (rE), low-resistance-low-aerobic exercise (re). Interventions began with 3 weeks of residential supervision (phase 1) after which participants had to manage the physical activity programs individually (phase 2). Body composition and plasma variables were measured at baseline and after phase 1 as well as after 3, 6, and 12 months. Significant decreases in body weight and fat were observed after phase 1 (p < 0.001) and continued at a lower rate for up to 3 months and then remained stable for the rest of the protocol. Once a body weight plateau was reached, body fat loss after the Re and rE conditions exceeded the fat loss observed in the re condition by 1.5-2 kg (p < 0.05). Leptin was significantly decreased after day 21 and month 3 (p < 0.001) and remained stable for the rest of the study. Ghrelin was significantly increased after day 21 and month 3 (p < 0.001) and returned to a level comparable to baseline between month 6 and 12 when body weight and fat had reached a plateau. In conclusion, this study reinforces the idea that an increase in exercise intensity may accentuate body fat loss before the occurrence of a body weight plateau. Resistance to further fat loss was accompanied by a decrease in plasma leptin and an increase in plasma ghrelin.
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Affiliation(s)
- Angelo Tremblay
- Institute of Nutrition and Functional Foods (INAF), Université Laval, Québec, QC G0A 4V0, Canada.,Department of Kinesiology, Université Laval, Québec, QC G0A 4V0, Canada
| | - Frédéric Dutheil
- CNRS, LaPSCo, Physiological and Psychosocial Stress, University Hospital of Clermont-Ferrand, CHU Clermont-Ferrand, Preventive and Occupational Medicine, WittyFit, Université Clermont Auvergne, 63000 Clermont-Ferrand, France.,Faculty of Health, School of Exercise Science, Australian Catholic University, Melbourne, VIC 3000, Australia
| | - Vicky Drapeau
- Institute of Nutrition and Functional Foods (INAF), Université Laval, Québec, QC G0A 4V0, Canada.,Department of Physical Education, Université Laval, Québec, QC G1V 0A6, Canada
| | - Lore Metz
- Clermont Auvergne University, EA 3533, Laboratory of the Metabolic Adaptations to Exercise under Physiological and Pathological Conditions (AME2P), 63000 Clermont-Ferrand, France.,CRNH-Auvergne, 63000 Clermont-Ferrand, France
| | - Bruno Lesour
- CHU G. Montpied, F-63000 Clermont-Ferrand, France
| | | | - Bruno Pereira
- Clermont-Ferrand University hospital, Biostatistics unit (DRCI), 63000 Clermont-Ferrand, France
| | - Julien Verney
- Clermont Auvergne University, EA 3533, Laboratory of the Metabolic Adaptations to Exercise under Physiological and Pathological Conditions (AME2P), 63000 Clermont-Ferrand, France.,CRNH-Auvergne, 63000 Clermont-Ferrand, France
| | - Julien S Baker
- Institute of Clinical Exercise and Health Sciences, School of Science and Sport, University of the West of Scotland, Hamilton, Lanarkshire G72 0BN, Scotland, UK
| | - Agnes Vinet
- Avignon University LAPEC EA4278, F-84000 Avignon, France
| | | | - Philippe Obert
- Institute of Nutrition and Functional Foods (INAF), Université Laval, Québec, QC G0A 4V0, Canada
| | - Daniel Courteix
- Clermont Auvergne University, EA 3533, Laboratory of the Metabolic Adaptations to Exercise under Physiological and Pathological Conditions (AME2P), 63000 Clermont-Ferrand, France.,CRNH-Auvergne, 63000 Clermont-Ferrand, France
| | - David Thivel
- Clermont Auvergne University, EA 3533, Laboratory of the Metabolic Adaptations to Exercise under Physiological and Pathological Conditions (AME2P), 63000 Clermont-Ferrand, France.,CRNH-Auvergne, 63000 Clermont-Ferrand, France
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