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Philippe AG, Goncalves A, Korchi K, Deshayes M. Exergaming in augmented reality is tailor-made for aerobic training and enjoyment among healthy young adults. Front Public Health 2024; 12:1307382. [PMID: 38469269 PMCID: PMC10925726 DOI: 10.3389/fpubh.2024.1307382] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2023] [Accepted: 02/14/2024] [Indexed: 03/13/2024] Open
Abstract
In recent years, the use of exergaming for physical activity practice has gain in popularity but few is known about the use of augmented reality for physical activity, particularly at moderate to vigorous intensities. The present study examined the use of an exergame in augmented reality for aerobic training in healthy young adults. In a within-subject design, 18 participants (19.8 ± 1.4 years of age) have performed two physical activity sessions playing dodgeball. Indeed, they realized a classical dodgeball session and an exergaming session with an augmented reality version of dodgeball game. Physical loads and intensities were measured with accelerometers, RPE and heart sensors. Enjoyment experienced during the sessions was measured with the short version of the physical activity enjoyment scale questionnaire. Results revealed that both physical load and intensity were appropriate for aerobic training in the two conditions (i.e., classical and exergame in augmented reality) although values were significantly higher in the classical condition. Enjoyment was high in the two conditions with a higher significant value in the classical condition compared to the exergame in augmented reality condition. Put together, these results indicate that an aerobic state can be attained through both physical gameplay and its augmented reality equivalent and was associated to a high level of enjoyment among healthy young adults.
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Goncalves A, Deshayes M, Gisclard B, Philippe AG, Bernal C, Krawczyk S, Korchi K, Nogrette M, Charbonnier E. Exploring the Health Effectiveness of a Physical Activity Program Co-Constructed with Students after the COVID-19 Pandemic. Nutrients 2023; 15:2913. [PMID: 37447238 DOI: 10.3390/nu15132913] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Accepted: 06/22/2023] [Indexed: 07/15/2023] Open
Abstract
BACKGROUND University students have low levels of physical activity and high levels of sedentary behaviors that were exacerbated by the COVID-19 pandemic. Even before the pandemic, there was poor uptake of university sports activities. Therefore, it is essential to develop and test innovative programs to increase students' motivation to engage in physical activity in order to prevent any future deterioration in their general health. OBJECTIVE This exploratory study was conducted to test the effectiveness of a physical activity program that was co-constructed with students. METHODS First, a workshop drawing on social design methodologies and the fundamentals of physical activity programs was conducted to assess students' needs and desires in terms of physical activity. Second, the effectiveness of a program co-constructed with students on the basis of this workshop was assessed on physical and mental health parameters. The results showed that the workshop outcomes allowed the physical activity program to be tailored to meet students' expectations (e.g., session duration and type of activities). This innovative physical activity program was found to improve body image, autonomous motivation, and certain physical parameters. At the end of the 8-week program, the adherence rate was 89%, and 83% of the final respondents expressed a wish to re-enroll for the following semester. CONCLUSIONS Involving students and considering their wishes, needs, and objectives could facilitate the development of attractive and innovative programs.
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Affiliation(s)
| | | | | | | | | | | | - Karim Korchi
- University of Nîmes, APSY-V, CEDEX 1, F-30021 Nîmes, France
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Charbonnier E, Le Vigouroux S, Puechlong C, Montalescot L, Goncalves A, Baussard L, Gisclard B, Philippe AG, Lespiau F. The Effect of Intervention Approaches of Emotion Regulation and Learning Strategies on Students' Learning and Mental Health. Inquiry 2023; 60:469580231159962. [PMID: 36998220 PMCID: PMC10068999 DOI: 10.1177/00469580231159962] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 04/01/2023]
Abstract
University students are a vulnerable population, and many recent studies show that anxiety, depressive symptoms, and academic burnout have been on the increase since the beginning of the COVID-19 pandemic. These findings point to a need for interventions to reduce these difficulties. The purpose of the present study was to assess the effects of 2 formats of an innovative program on students' mental health (anxiety, depressive symptoms, and academic burnout), intolerance of uncertainty, learned helplessness, and learning. Our sample was composed of 105 university students, recruited on a voluntary basis. They were divided into 3 groups: online intervention group (n = 36), face-to-face intervention group (n = 32), and control group (n = 37). The following variables were measured through online questionnaires: anxiety and depressive symptoms, academic burnout, intolerance of uncertainty, learned helplessness, perceived social support, learning strategies, and beliefs. There were 2 assessments 10 weeks apart (ie, before and after the program in the case of the 2 intervention groups). We performed nonparametric analyses to run comparisons between the 2 assessment timepoints in each group. Results showed that participants in the 2 intervention groups had lower levels of learned helplessness and intolerance of uncertainty at the end of the program. Furthermore, participants in the face-to-face group reported higher levels of perceived social support, academic self-efficacy, and help-seeking strategies. The present study highlighted the benefits of our innovative program, especially its face-to-face format.Clinical Trial - ID: NCT04978194.
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Deshayes M, Palermo A, Korchi K, Philippe AG. Influence of negative stereotype on physical activity level among older adults during a training session. Front Sports Act Living 2022; 4:998724. [PMID: 36506719 PMCID: PMC9732565 DOI: 10.3389/fspor.2022.998724] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2022] [Accepted: 11/09/2022] [Indexed: 11/27/2022] Open
Abstract
The present research examined the effect of a negative stereotype induction on older adults' physical activity level, measured objectively and subjectively. Twenty older adults (18 women and two men; Mage = 67.4, SDage = 4.4) were assigned to a control condition, a neutral condition and a negative stereotype condition during three separate visits (i.e., within-subject design). In each physical activity session, participants performed the same training. Objective physical activity level was the time spent at moderate to vigorous intensity measured by accelerometry and subjective physical activity level was measured with the RPE-session method. Inactivity time was also objectively assessed. Results revealed no effect of the different conditions on objective physical activity level, but subjective physical activity level and inactivity time were lower in the neutral condition and in the negative stereotype condition compared to the control condition. It was suggested that when a negative stereotype is induced, participants perceived the task as less intense compared to the control condition, which result in less inactivity time, suggesting that the negative stereotype had a positive influence on physical activity. Another interesting result was that effects were similar in the negative stereotype condition and in the neutral condition, revealing that the neutral condition might not be a control condition. While these results are not in line with the stereotype threat literature, they echo previous recent studies also showing a positive effect of a negative stereotype induction, calling into question the stereotype threat theory.
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Goncalves A, Bernal C, Korchi K, Nogrette M, Deshayes M, Philippe AG, Gisclard B, Charbonnier E. Promoting Physical Activity Among University Students During the COVID-19 Pandemic: Protocol for a Randomized Controlled Trial. JMIR Res Protoc 2022; 11:e36429. [PMID: 35700019 PMCID: PMC9202516 DOI: 10.2196/36429] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2022] [Revised: 04/12/2022] [Accepted: 04/26/2022] [Indexed: 12/21/2022] Open
Abstract
Background Since the beginning of the COVID-19 pandemic, sanitary context and e-learning have greatly modified student lifestyles and led to deteriorations in their mental health. An increase in anxiety and depressive symptoms and sedentary behaviors, reduction in physical activity, and a stronger tendency to move toward unhealthy diet have been demonstrated. This finding highlights the need for innovative interventions to promote healthy lifestyle among students. Objective This research protocol aims to evaluate the effects of an intervention program on the lifestyle and psychological state of students. Methods Students from University of Nîmes were recruited and randomly assigned to 1 of 2 following conditions: an intervention group and a control group. Participants in the intervention group were engaged in an 8-week physical activity program. Prior to the start of the program, design-based innovative workshops were conducted with participants to ensure that the program was co-constructed by the users and met their specific needs. Students in the control group did not receive any intervention. For each group, measures of physical activity, sedentary time, anthropometric data, sleep, physical condition, and psychological variables (eg, anxiety, depression, motivation, body appreciation, perceived control, well-being) were conducted at baseline and 9 weeks later. Results A total of 110 participants were initially included. Reporting of the results is projected for the spring of 2022. Conclusions It is anticipated that this innovative intervention co-constructed by pairs will promote a healthier lifestyle and psychological health in students. There is every reason to believe that a mobilized co-construction approach is a promising strategy to limit unhealthy habits and promote physical activity while increasing motivation. The development and evaluation of interventions to address the specific needs of university students is essential and could be transferred to other vulnerable populations such as people with chronic diseases or older people. Trial Registration ClinicalTrials.gov NCT05019482; https://clinicaltrials.gov/ct2/show/NCT05019482 International Registered Report Identifier (IRRID) DERR1-10.2196/36429
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Charbonnier E, Trémolière B, Baussard L, Goncalves A, Lespiau F, Philippe AG, Le Vigouroux S. Effects of an online self-help intervention on university students' mental health during COVID-19: A non-randomized controlled pilot study. Comput Hum Behav Rep 2022; 5:100175. [PMID: 35169655 PMCID: PMC8830176 DOI: 10.1016/j.chbr.2022.100175] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2021] [Revised: 01/20/2022] [Accepted: 02/08/2022] [Indexed: 01/25/2023] Open
Abstract
The COVID-19 pandemic has had a major impact on university students, particulary on their mental health. However, little is yet known about how to prevent and/or reduce this impact. Prior to COVID-19, some studies have shown that online stress management programs were successful enough to improve students' mental health and stress adjustment strategies, suggesting that these interventions should be further developed during the pandemic. Our study explored the effects on mental health of an online program that targeted stress management and learning. A total of 347 university students were initially recruited to take part in a non-randomized controlled study. After dropout, our final sample consisted of 114 participants, divided into two groups: an intervention group (participants who took part in the program) and the control group (participants who did not participate in the program). The variables measured were: anxiety and depressive symptoms, academic burnout, learned helplessness, and coping strategies. Means comparisons between baseline (T0) and an assessment at 8 weeks (T1) revealed reductions in anxiety symptoms and learned helplessness in the intervention group, but not in the control group. Our pilot study reports promising effects of an online program on students' psychological state.
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Affiliation(s)
- Elodie Charbonnier
- Corresponding author. Université de Nîmes – Site Vauban Elodie Charbonnier, 5 Rue du Docteur Georges Salan, CS 13019, 30021, Nîmes, France
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Roumanille R, Vernus B, Brioche T, Descossy V, Van Ba CT, Campredon S, Philippe AG, Delobel P, Bertrand-Gaday C, Chopard A, Bonnieu A, Py G, Fança-Berthon P. Acute and chronic effects of Rhaponticum carthamoides and Rhodiola rosea extracts supplementation coupled to resistance exercise on muscle protein synthesis and mechanical power in rats. J Int Soc Sports Nutr 2020; 17:58. [PMID: 33198764 PMCID: PMC7670727 DOI: 10.1186/s12970-020-00390-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Accepted: 11/04/2020] [Indexed: 12/19/2022] Open
Abstract
BACKGROUND Owing to its strength-building and adaptogenic properties, Rhaponticum carthamoides (Rha) has been commonly used by elite Soviet and Russian athletes. Rhodiola rosea (Rho) is known to reduce physical and mental fatigue and improve endurance performance. However, the association of these two nutritional supplements with resistance exercise performance has never been tested. Resistance exercise is still the best way to stimulate protein synthesis and induce chronic muscle adaptations. The aim of this study was to investigate the acute and chronic effects of resistance exercise coupled with Rha and Rho supplementation on protein synthesis, muscle phenotype, and physical performance. METHODS For the acute study, fifty-six rats were assigned to either a trained control group or one of the groups treated with specific doses of Rha and/or Rho. Each rats performed a single bout of climbing resistance exercise. The supplements were administered immediately after exercise by oral gavage. Protein synthesis was measured via puromycin incorporation. For the chronic study, forty rats were assigned to either the control group or one of the groups treated with doses adjusted from the acute study results. The rats were trained five times per week for 4 weeks with the same bout of climbing resistance exercise with additionals loads. Rha + Rho supplement was administered immediately after each training by oral gavage. RESULTS The findings of the acute study indicated that Rha and Rha + Rho supplementation after resistance exercise stimulated protein synthesis more than resistance exercise alone (p < 0.05). After 4 weeks of training, the mean power performance was increased in the Rha + Rho and Rha-alone groups (p < 0.05) without any significant supplementation effect on muscle weight or fiber cross-sectional area. A tendency towards an increase in type I/ type II fiber ratio was observed in Rha/Rho-treated groups compared to that in the trained control group. CONCLUSION Rhodiola and Rhaponticum supplementation after resistance exercise could synergistically improve protein synthesis, muscle phenotype and physical performance.
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Affiliation(s)
- Rémi Roumanille
- DMEM, Université Montpellier, INRAE, INRA UMR 866 - 2 place Pierre Viala, Bat. 22, 34060, Montpellier, France.
| | - Barbara Vernus
- DMEM, Université Montpellier, INRAE, INRA UMR 866 - 2 place Pierre Viala, Bat. 22, 34060, Montpellier, France
| | - Thomas Brioche
- DMEM, Université Montpellier, INRAE, INRA UMR 866 - 2 place Pierre Viala, Bat. 22, 34060, Montpellier, France
| | - Vincent Descossy
- DMEM, Université Montpellier, INRAE, INRA UMR 866 - 2 place Pierre Viala, Bat. 22, 34060, Montpellier, France
| | - Christophe Tran Van Ba
- DMEM, Université Montpellier, INRAE, INRA UMR 866 - 2 place Pierre Viala, Bat. 22, 34060, Montpellier, France
| | - Sarah Campredon
- DMEM, Université Montpellier, INRAE, INRA UMR 866 - 2 place Pierre Viala, Bat. 22, 34060, Montpellier, France
| | - Antony G Philippe
- DMEM, Université Montpellier, INRAE, INRA UMR 866 - 2 place Pierre Viala, Bat. 22, 34060, Montpellier, France.,Université de Nîmes, Laboratoire CHROME, Nîmes, France
| | - Pierre Delobel
- DMEM, Université Montpellier, INRAE, INRA UMR 866 - 2 place Pierre Viala, Bat. 22, 34060, Montpellier, France
| | - Christelle Bertrand-Gaday
- DMEM, Université Montpellier, INRAE, INRA UMR 866 - 2 place Pierre Viala, Bat. 22, 34060, Montpellier, France
| | - Angèle Chopard
- DMEM, Université Montpellier, INRAE, INRA UMR 866 - 2 place Pierre Viala, Bat. 22, 34060, Montpellier, France
| | - Anne Bonnieu
- DMEM, Université Montpellier, INRAE, INRA UMR 866 - 2 place Pierre Viala, Bat. 22, 34060, Montpellier, France
| | - Guillaume Py
- DMEM, Université Montpellier, INRAE, INRA UMR 866 - 2 place Pierre Viala, Bat. 22, 34060, Montpellier, France
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Philippe AG, Lionne C, Sanchez AMJ, Pagano AF, Candau R. Increase in muscle power is associated with myofibrillar ATPase adaptations during resistance training. Exp Physiol 2019; 104:1274-1285. [DOI: 10.1113/ep087071] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2018] [Accepted: 06/04/2019] [Indexed: 12/17/2022]
Affiliation(s)
- Antony G. Philippe
- Université de Montpellier INRA UMR866 Dynamique Musculaire et Métabolisme F‐34060 Montpellier France
| | - Corinne Lionne
- Centre de Biochimie Structurale CNRS UMR 5048 – UM – INSERM U 1054 Montpellier France
| | - Anthony M. J. Sanchez
- Laboratoire Européen Performance Santé AltitudeEA4604, University of Perpignan Via DomitiaFaculty of Sports Sciences Font‐Romeu France
| | - Allan F. Pagano
- Université de Montpellier INRA UMR866 Dynamique Musculaire et Métabolisme F‐34060 Montpellier France
| | - Robin Candau
- Université de Montpellier INRA UMR866 Dynamique Musculaire et Métabolisme F‐34060 Montpellier France
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Philippe AG, Borrani F, Sanchez AM, Py G, Candau R. Modelling performance and skeletal muscle adaptations with exponential growth functions during resistance training. J Sports Sci 2018; 37:254-261. [PMID: 29972090 DOI: 10.1080/02640414.2018.1494909] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
System theory is classically applied to describe and to predict the effects of training load on performance. The classic models are structured by impulse-type transfer functions, nevertheless, most biological adaptations display exponential growth kinetics. The aim of this study was to propose an extension of the model structure taking into account the exponential nature of skeletal muscle adaptations by using a genetic algorithm. Thus, the conventional impulse-type model was applied in 15 resistance trained rodents and compared with exponential growth-type models. Even if we obtained a significant correlation between actual and modelled performances for all the models, our data indicated that an exponential model is associated with more suitable parameters values, especially the time constants that correspond to the positive response to training. Moreover, positive adaptations predicted with an exponential component showed a strong correlation with the main structural adaptations examined in skeletal muscles, i.e. hypertrophy (R2 = 0.87, 0.96 and 0.99, for type 1, 2A and 2X cross-sectional area fibers, respectively) and changes in fiber-type composition (R2 = 0.81 and 0.79, for type 1 and 2A fibers, respectively). Thus, an exponential model succeeds to describe both performance variations with relevant time constants and physiological adaptations that take place during resistance training.
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Affiliation(s)
- Antony G Philippe
- a INRA, UMR866 Dynamique Musculaire et Métabolisme , University of Montpellier , Montpellier , France
| | - Fabio Borrani
- b Institute of Sport Sciences of University of Lausanne (ISSUL), faculty of biology and medicine , University of Lausanne , Lausanne , Switzerland
| | - Anthony Mj Sanchez
- c Department of Sports Sciences, Laboratoire Européen Performance Santé Altitude, EA4604 , University of Perpignan Via Domitia , Font-Romeu , France
| | - Guillaume Py
- a INRA, UMR866 Dynamique Musculaire et Métabolisme , University of Montpellier , Montpellier , France
| | - Robin Candau
- a INRA, UMR866 Dynamique Musculaire et Métabolisme , University of Montpellier , Montpellier , France
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Agostinho MF, Philippe AG, Marcolino GS, Pereira ER, Busso T, Candau RB, Franchini E. Perceived training intensity and performance changes quantification in judo. J Strength Cond Res 2016; 29:1570-7. [PMID: 25436630 DOI: 10.1519/jsc.0000000000000777] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The objective of this study was to determine the methods of quantification for training and performance, which would be the most appropriate for modeling the responses to long-term training in cadet and junior judo athletes. For this, 10 young male judo athletes (15.9 ± 1.3 years, 64.9 ± 10.3 kg, and 170.8 ± 5.4 cm) competing at a regional/state level volunteered to take part in this study. Data were collected during a 2-year training period (i.e., 702 days) from January 2011 to December 2012. Their mean training volume was 6.52 ± 0.43 hours per week during the preparatory periods and 4.75 ± 0.49 hours per week during the competitive periods. They followed a training program prescribed by the same coach. The training load (TL) was quantified through the session rating of perceived exertion (RPE) and expressed in arbitrary unit (a.u.). Performance was quantified from 5 parameters and divided into 2 categories: performance in competition and performance in training. The evaluation of performance in competition was based on the number of points per level. Performance in training was assessed through 4 different tests. A physical test battery consisting of a standing long jump, 2 judo-specific tests that were the maximal number of dynamic chin-up holding the judogi, and the Special Judo Fitness Test was used. System modeling for describing training adaptations consisted of mathematically relating the TL of the training sessions (system input) to the change in performance (system output). The quality of the fit between TL and performance was similar, whether the TL was computed directly from RPE (R = 0.55 ± 0.18) or from the session RPE (R = 0.56 ± 0.18) and was significant in 8 athletes over 10, excluding the standing jump from the computation of the TL, leading to a simplest method. Thus, this study represents a first attempt to model TL effects on judo-specific performance and has shown that the best relationships between amounts of training and changes in performance were obtained when training amounts were quantified simply from RPE.
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Affiliation(s)
- Marcus F Agostinho
- 1Martial Arts and Combat Sports Research Group, School of Physical Education and Sport, University of São Paulo, São Paulo, Brazil; 2Barueri Recreation Association and Cotia Sports Secretary, Brazil; 3Faculty of Sports Sciences, UMR 866, University of Montpellier, Montpellier, France; and 4Laboratory of Physiology and Exercise, University of Saint-Etienne, Saint-Etienne, France
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Morquette P, Verdier D, Kadala A, Féthière J, Philippe AG, Robitaille R, Kolta A. An astrocyte-dependent mechanism for neuronal rhythmogenesis. Nat Neurosci 2015; 18:844-54. [PMID: 25938883 DOI: 10.1038/nn.4013] [Citation(s) in RCA: 103] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2015] [Accepted: 04/02/2015] [Indexed: 12/22/2022]
Abstract
Communication between neurons rests on their capacity to change their firing pattern to encode different messages. For several vital functions, such as respiration and mastication, neurons need to generate a rhythmic firing pattern. Here we show in the rat trigeminal sensori-motor circuit for mastication that this ability depends on regulation of the extracellular Ca(2+) concentration ([Ca(2+)]e) by astrocytes. In this circuit, astrocytes respond to sensory stimuli that induce neuronal rhythmic activity, and their blockade with a Ca(2+) chelator prevents neurons from generating a rhythmic bursting pattern. This ability is restored by adding S100β, an astrocytic Ca(2+)-binding protein, to the extracellular space, while application of an anti-S100β antibody prevents generation of rhythmic activity. These results indicate that astrocytes regulate a fundamental neuronal property: the capacity to change firing pattern. These findings may have broad implications for many other neural networks whose functions depend on the generation of rhythmic activity.
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Affiliation(s)
- Philippe Morquette
- Département de Neurosciences and Groupe de Recherche sur le Système Nerveux Central, Université de Montréal, Montréal, Québec, Canada
| | - Dorly Verdier
- Département de Neurosciences and Groupe de Recherche sur le Système Nerveux Central, Université de Montréal, Montréal, Québec, Canada
| | - Aklesso Kadala
- Département de Neurosciences and Groupe de Recherche sur le Système Nerveux Central, Université de Montréal, Montréal, Québec, Canada
| | - James Féthière
- Faculté de Pharmacie, Université de Montréal, Montréal, Québec, Canada
| | - Antony G Philippe
- 1] Faculté des Sciences du Sport, Université Montpellier 1, Montpellier, France. [2] Institut National de la Recherche Agronomique, UMR866 Dynamique Musculaire Et Métabolisme, Montpellier, France
| | - Richard Robitaille
- Département de Neurosciences and Groupe de Recherche sur le Système Nerveux Central, Université de Montréal, Montréal, Québec, Canada
| | - Arlette Kolta
- 1] Département de Neurosciences and Groupe de Recherche sur le Système Nerveux Central, Université de Montréal, Montréal, Québec, Canada. [2] Faculté de Médecine Dentaire and Réseau de Recherche en Santé Bucco-dentaire et Osseuse du Fonds de Recherche Québec-Santé, Université de Montréal, Montréal, Québec, Canada
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Py G, Ramonatxo C, Sirvent P, Sanchez AMJ, Philippe AG, Douillard A, Galbès O, Lionne C, Bonnieu A, Chopard A, Cazorla O, Lacampagne A, Candau RB. Chronic clenbuterol treatment compromises force production without directly altering skeletal muscle contractile machinery. J Physiol 2015; 593:2071-84. [PMID: 25656230 DOI: 10.1113/jphysiol.2014.287060] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2014] [Accepted: 01/27/2015] [Indexed: 01/30/2023] Open
Abstract
Clenbuterol is a β2 -adrenergic receptor agonist known to induce skeletal muscle hypertrophy and a slow-to-fast phenotypic shift. The aim of the present study was to test the effects of chronic clenbuterol treatment on contractile efficiency and explore the underlying mechanisms, i.e. the muscle contractile machinery and calcium-handling ability. Forty-three 6-week-old male Wistar rats were randomly allocated to one of six groups that were treated with either subcutaneous equimolar doses of clenbuterol (4 mg kg(-1) day(-1) ) or saline solution for 9, 14 or 21 days. In addition to the muscle hypertrophy, although an 89% increase in absolute maximal tetanic force (Po ) was noted, specific maximal tetanic force (sPo) was unchanged or even depressed in the slow twitch muscle of the clenbuterol-treated rats (P < 0.05). The fit of muscle contraction and relaxation force kinetics indicated that clenbuterol treatment significantly reduced the rate constant of force development and the slow and fast rate constants of relaxation in extensor digitorum longus muscle (P < 0.05), and only the fast rate constant of relaxation in soleus muscle (P < 0.05). Myofibrillar ATPase activity increased in both relaxed and activated conditions in soleus (P < 0.001), suggesting that the depressed specific tension was not due to the myosin head alteration itself. Moreover, action potential-elicited Ca(2+) transients in flexor digitorum brevis fibres (fast twitch fibres) from clenbuterol-treated animals demonstrated decreased amplitude after 14 days (-19%, P < 0.01) and 21 days (-25%, P < 0.01). In conclusion, we showed that chronic clenbuterol treatment reduces contractile efficiency, with altered contraction and relaxation kinetics, but without directly altering the contractile machinery. Lower Ca(2+) release during contraction could partially explain these deleterious effects.
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Affiliation(s)
- G Py
- Faculté des Sciences du Sport, Université Montpellier, 700 avenue du Pic Saint-Loup, F-34060, Montpellier, France; INRA, UMR866, Université Montpellier, 2 Place Viala, F-34060, Montpellier, France
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