1
|
Emadi Andani M, Barbiani D, Bonetto M, Menegaldo R, Villa-Sánchez B, Fiorio M. Preserving the placebo effect after disclosure: A new perspective on non-deceptive placebos. Br J Psychol 2024; 115:437-453. [PMID: 38226695 DOI: 10.1111/bjop.12696] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2023] [Revised: 12/07/2023] [Accepted: 01/08/2024] [Indexed: 01/17/2024]
Abstract
The present study explores whether a particular style of placebo disclosure could serve as a tool to foster a renewed trust in one's own inherent resources and elicit a meaningful placebo effect. In a motor performance task, two placebo groups received inert transcutaneous electrical nerve stimulation (TENS) in each of four sessions along with information on its force-enhancing properties. Before the final session, one of the placebo groups was informed about the placebo, which was portrayed as a means to unleash an inherent potential. Along with force, we systematically monitored task-specific self-efficacy to test whether this variable would be differentially modulated in the two placebo groups. Compared to two control groups, placebo groups showed higher force and self-efficacy in the last session. No differences in self-efficacy were observed in the placebo groups even after revealing the placebo procedure, suggesting that the disclosure was effective in 'safeguarding' individuals' self-efficacy. These findings may have important implications, paving the way for the use of placebos that not only are ethically permissible but also support individuals' self-efficacy.
Collapse
Affiliation(s)
- Mehran Emadi Andani
- Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Verona, Italy
| | - Diletta Barbiani
- Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Verona, Italy
- Department of Psychology, Università Cattolica del Sacro Cuore, Milan, Italy
| | - Marco Bonetto
- Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Verona, Italy
| | - Rudy Menegaldo
- Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Verona, Italy
| | | | - Mirta Fiorio
- Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Verona, Italy
| |
Collapse
|
2
|
Bisio A, Panascì M, Ferrando V, Albergoni A, Ruggeri P, Faelli E. Warm-up plus verbal communications administered as placebo procedure during the training session improves running performance. PSYCHOLOGY OF SPORT AND EXERCISE 2024; 73:102633. [PMID: 38548005 DOI: 10.1016/j.psychsport.2024.102633] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2023] [Revised: 12/10/2023] [Accepted: 03/25/2024] [Indexed: 04/06/2024]
Abstract
The aim of this study was to investigate the effects on running performance of a within-session placebo procedure consisting of a conditioning treatment plus verbal communications. Twenty-six subjects were assigned to PLACEBO and CONTROL groups. Participants performed three sessions: Session 1-Cooper Test, Session 2-Baseline session and Session 3-Experimental session. During Session 2, participants performed a sprint-interval-training (SIT)-until-exhaustion preceded by a general warm-up, while in Session3 the SIT was preceded by a conditioning treatment (FIFA11+ warm-up), known to be effective in preventing injuries but not improving performance. Moreover, in Session3, only the PLACEBO group received verbal suggestions (before the warm-up) to influence participants' expectations about FIFA11+ effectiveness in improving performance, and deceptive feedback (during each SIT recovery bout) to increase the conditioning effect. To evaluate performance improvements, Running Time was chosen as a main outcome while to ensure participants reached exhaustion, physiological and metabolic responses were monitored. Total running distance (TRD) was also measured. Results showed that, Running Time and TRD significantly increased in the PLACEBO group whilst no differences in the CONTROL group were observed thus, suggesting the effectiveness of the within-session-placebo procedure in improving running performance. These findings shed a new light on the interaction between cognitive domain and performance, thus encouraging coaches to adopt this innovative method during the training protocol to enhance athletes' performance. Moreover, this placebo procedure, not requiring additional time, tools or resources, could represent a more ecological approach that can be easily adopted in the field.
Collapse
Affiliation(s)
- Ambra Bisio
- Section of Human Physiology, Department of Experimental Medicine, Università Degli Studi di Genova, 16132, Genoa, Italy; Centro Polifunzionale di Scienze Motorie, Università Degli Studi di Genova, 16132, Genoa, Italy
| | - Marco Panascì
- Section of Human Physiology, Department of Experimental Medicine, Università Degli Studi di Genova, 16132, Genoa, Italy; Centro Polifunzionale di Scienze Motorie, Università Degli Studi di Genova, 16132, Genoa, Italy
| | - Vittoria Ferrando
- Section of Human Physiology, Department of Experimental Medicine, Università Degli Studi di Genova, 16132, Genoa, Italy; Centro Polifunzionale di Scienze Motorie, Università Degli Studi di Genova, 16132, Genoa, Italy.
| | - Andrea Albergoni
- Centro Polifunzionale di Scienze Motorie, Università Degli Studi di Genova, 16132, Genoa, Italy; Department of Neuroscience, Rehabilitation, Ophthalmology, Genetics and Maternal Child Health, Università Degli Studi di Genova, 16132, Genoa, Italy
| | - Piero Ruggeri
- Section of Human Physiology, Department of Experimental Medicine, Università Degli Studi di Genova, 16132, Genoa, Italy; Centro Polifunzionale di Scienze Motorie, Università Degli Studi di Genova, 16132, Genoa, Italy
| | - Emanuela Faelli
- Section of Human Physiology, Department of Experimental Medicine, Università Degli Studi di Genova, 16132, Genoa, Italy; Centro Polifunzionale di Scienze Motorie, Università Degli Studi di Genova, 16132, Genoa, Italy
| |
Collapse
|
3
|
Pereira-Alves E, Machado-Pereira J, Monteiro A, Costa-Cordeiro R, Chandran V, Jurisica I, Prado E, Cameron LC. Caffeine Boosts Weight-Lifting Performance in Rats: A Pilot Study. Nutrients 2024; 16:2022. [PMID: 38999769 PMCID: PMC11243630 DOI: 10.3390/nu16132022] [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: 06/01/2024] [Revised: 06/20/2024] [Accepted: 06/25/2024] [Indexed: 07/14/2024] Open
Abstract
Caffeine is a well-described ergogenic aid used to enhance athletic performance. Using animal models can greatly increase our understanding of caffeine's mechanisms in performance. Here, we adapted an animal weight-lifting exercise model to demonstrate caffeine's ergogenic effect in rats. Male Wistar rats (315 ± 35 g) were randomly divided into two groups: one group received 5 mg·kg-1 of caffeine (0.5 mL; CEx; n = 5) and the other 0.9% NaCl (0.5 mL; PEx; n = 4) through an orogastric probe (gavage) one hour before exercise. Weight-lifting exercise sessions were performed over three subsequent days, and the number of complete squats performed was counted. Analyses of the area under the curve in all three experiments showed that the CEx group responded more to stimuli, performing more squats (1.7-, 2.0-, and 1.6-fold; p < 0.05) than the control group did. These three days' data were analyzed to better understand the cumulative effect of this exercise, and a hyperbolic curve was fitted to these data. Data fitting from the caffeine-supplemented group, CEx, also showed larger Smax and Kd (2.3-fold and 1.6-fold, respectively) than the PEx group did. Our study demonstrated an acute ergogenic effect of caffeine in an animal weight-lifting exercise model for the first time, suggesting potential avenues for future research.
Collapse
Affiliation(s)
- Emanuel Pereira-Alves
- Lorraine Protein Biochemistry Group, Graduate Program in Neurology, Gaffrée e Guinle University Hospital, Rio de Janeiro 20270-004, RJ, Brazil; (E.P.-A.); (J.M.-P.); (R.C.-C.)
| | - Julia Machado-Pereira
- Lorraine Protein Biochemistry Group, Graduate Program in Neurology, Gaffrée e Guinle University Hospital, Rio de Janeiro 20270-004, RJ, Brazil; (E.P.-A.); (J.M.-P.); (R.C.-C.)
| | - Anibal Monteiro
- Laboratory of Protein Biochemistry, The Federal University of the State of Rio de Janeiro, Rio de Janeiro 20290-250, RJ, Brazil;
- Institute of Biological and Health Sciences, Federal University of Mato Grosso, Barra do Garças 78605-091, MG, Brazil
| | - Roberto Costa-Cordeiro
- Lorraine Protein Biochemistry Group, Graduate Program in Neurology, Gaffrée e Guinle University Hospital, Rio de Janeiro 20270-004, RJ, Brazil; (E.P.-A.); (J.M.-P.); (R.C.-C.)
| | - Vinod Chandran
- Arthritis Program, Schroeder Arthritis Institute, Krembil Research Institute, University Health Network, Toronto, ON M5T 0S8, Canada;
- Division of Rheumatology, Department of Medicine, Institute of Medical Science, Department of Laboratory Medicine and Pathobiology, Faculty of Medicine, University of Toronto, Toronto, ON M5T 0S8, Canada
| | - Igor Jurisica
- Osteoarthritis Research Program, Division of Orthopedic Surgery, Schroeder Arthritis Institute and Data Science Discovery Centre for Chronic Diseases, Krembil Research Institute, University Health Network, Toronto, ON M5T 0S8, Canada;
- Departments of Medical Biophysics and Computer Science and Faculty of Dentistry, University of Toronto, Toronto, ON M5G IL7, Canada
- Institute of Neuroimmunology, Slovak Academy of Sciences, 845 10 Bratislava, Slovakia
| | - Eduardo Prado
- Lorraine Protein Biochemistry Group, Graduate Program in Neurology, Gaffrée e Guinle University Hospital, Rio de Janeiro 20270-004, RJ, Brazil; (E.P.-A.); (J.M.-P.); (R.C.-C.)
- Laboratory for Research in Physical Exercise and Metabolism, Federal University of Alagoas, Maceió 57072-900, AL, Brazil
| | - L. C. Cameron
- Lorraine Protein Biochemistry Group, Graduate Program in Neurology, Gaffrée e Guinle University Hospital, Rio de Janeiro 20270-004, RJ, Brazil; (E.P.-A.); (J.M.-P.); (R.C.-C.)
- Arthritis Program, Schroeder Arthritis Institute, Krembil Research Institute, University Health Network, Toronto, ON M5T 0S8, Canada;
| |
Collapse
|
4
|
Ortiz-Sánchez D, Bravo-Sánchez A, Ramírez-delaCruz M, Abián P, Abián-Vicén J. Placebo Effect of Caffeine on Physiological Parameters and Physical Performance. Nutrients 2024; 16:1405. [PMID: 38794643 PMCID: PMC11123970 DOI: 10.3390/nu16101405] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2024] [Revised: 05/03/2024] [Accepted: 05/04/2024] [Indexed: 05/26/2024] Open
Abstract
This study aimed to analyse the placebo effect associated with a high dose of caffeine (9 mg/kg) on heart rate and its variability and on strength tests. METHODS 18 participants experienced in strength training (19.7 ± 2.3 years; 72.2 ± 15.0 kg; 169.6 ± 9.0 cm) performed two days of trials (caffeine-informed/placebo-ingested (placebo) and non-ingested (control)). Firstly, heart rate and its variability were measured while participants lay down for 15 min. After that, bench press and squat tests were performed at 3 different loads (50%, 75% and 90% of 1RM). Perception of performance, effort and side effects were also evaluated. RESULTS no differences were found in the vast majority of strength variables analysed. Resting heart rate decreased in the placebo trial (60.39 ± 10.18 bpm control vs. 57.56 ± 9.50 bpm placebo, p = 0.040), and mean RR increased (1020.1 ± 172.9 ms control vs. 1071.5 ± 185.7 ms placebo, p = 0.032). Heart rate variability and perception of performance and effort were similar between conditions (p > 0.05 in all cases). Side effects such as activeness and nervousness were reported while consuming the placebo. CONCLUSIONS the placebo effect did not modify performance in the majority of the strength test variables, HRV and perception of performance and effort. However, resting heart rate was reduced, mean RR increased, and some side effects appeared in the placebo trial.
Collapse
Affiliation(s)
- David Ortiz-Sánchez
- Performance and Sport Rehabilitation Laboratory (DEPORSALUD), Faculty of Sports Sciences, University of Castilla-La Mancha, Avenida Carlos III s/n, 45071 Toledo, Spain; (D.O.-S.); (A.B.-S.); (M.R.-d.); (P.A.)
| | - Alfredo Bravo-Sánchez
- Performance and Sport Rehabilitation Laboratory (DEPORSALUD), Faculty of Sports Sciences, University of Castilla-La Mancha, Avenida Carlos III s/n, 45071 Toledo, Spain; (D.O.-S.); (A.B.-S.); (M.R.-d.); (P.A.)
- Faculty of Health Sciences, Universidad Francisco de Vitoria, 28223 Pozuelo de Alarcón, Spain
| | - María Ramírez-delaCruz
- Performance and Sport Rehabilitation Laboratory (DEPORSALUD), Faculty of Sports Sciences, University of Castilla-La Mancha, Avenida Carlos III s/n, 45071 Toledo, Spain; (D.O.-S.); (A.B.-S.); (M.R.-d.); (P.A.)
| | - Pablo Abián
- Performance and Sport Rehabilitation Laboratory (DEPORSALUD), Faculty of Sports Sciences, University of Castilla-La Mancha, Avenida Carlos III s/n, 45071 Toledo, Spain; (D.O.-S.); (A.B.-S.); (M.R.-d.); (P.A.)
- Faculty of Humanities and Social Sciences, Comillas Pontifical University, Calle. Alberto Aguilera 23, 28049 Madrid, Spain
| | - Javier Abián-Vicén
- Performance and Sport Rehabilitation Laboratory (DEPORSALUD), Faculty of Sports Sciences, University of Castilla-La Mancha, Avenida Carlos III s/n, 45071 Toledo, Spain; (D.O.-S.); (A.B.-S.); (M.R.-d.); (P.A.)
| |
Collapse
|
5
|
Valero F, González-Mohíno F, Salinero JJ. Belief That Caffeine Ingestion Improves Performance in a 6-Minute Time Trial Test without Affecting Pacing Strategy. Nutrients 2024; 16:327. [PMID: 38276565 PMCID: PMC10819016 DOI: 10.3390/nu16020327] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2023] [Revised: 01/18/2024] [Accepted: 01/19/2024] [Indexed: 01/27/2024] Open
Abstract
This study aimed to analyze the placebo effect associated with caffeine ingestion on running performance. METHODS Thirteen recreationally trained males in long-distance running (age: 38.5 ± 11.9 years, 11.0 ± 8.8 years of running experience) performed a 6 min time trial test in each experimental condition (caffeine-informed/placebo ingested (placebo) and non-ingested (control)) separated by 7 days. The total distance covered was measured, and partial times of each 400 m were used to analyze the pacing strategy. Heart rate and kinematic variables were recorded for each split. In addition, the rate of perceived exertion and prevalence of caffeine side effects was measured using questionnaires. RESULTS Placebo ingestion improved running performance in the 6 min time trial test (1668 ± 139 m placebo vs. 1642 ± 158 m control, t = 2.49; p = 0.03; moderate ES = 0.69), while pacing, heart rate, RPE, and kinematic variables were similar between conditions (p > 0.05 in all cases). Minor side effects were reported. CONCLUSIONS Beliefs of caffeine ingestion can improve running performance at speeds around maximal aerobic speed in recreationally trained runners without affecting pacing strategy so this "nutritional" strategy could be useful in competition scenarios. As a practical application, recreationally trained runners could improve ≈5 s in 1500 m or mile competitions.
Collapse
Affiliation(s)
- Fernando Valero
- Sport Training Lab, Faculty of Sport Sciences, University of Castilla-La Mancha, 45071 Toledo, Spain; (F.V.); (F.G.-M.)
| | - Fernando González-Mohíno
- Sport Training Lab, Faculty of Sport Sciences, University of Castilla-La Mancha, 45071 Toledo, Spain; (F.V.); (F.G.-M.)
- Facultad de Ciencias de la Vida y de la Naturaleza, Universidad Nebrija, 28248 Madrid, Spain
| | - Juan José Salinero
- Sport Training Lab, Faculty of Sport Sciences, University of Castilla-La Mancha, 45071 Toledo, Spain; (F.V.); (F.G.-M.)
| |
Collapse
|
6
|
Lowery LM, Anderson DE, Scanlon KF, Stack A, Escalante G, Campbell SC, Kerksick CM, Nelson MT, Ziegenfuss TN, VanDusseldorp TA, Kalman DS, Campbell BI, Kreider RB, Antonio J. International society of sports nutrition position stand: coffee and sports performance. J Int Soc Sports Nutr 2023; 20:2237952. [PMID: 37498180 PMCID: PMC10375938 DOI: 10.1080/15502783.2023.2237952] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2023] [Accepted: 07/11/2023] [Indexed: 07/28/2023] Open
Abstract
Based on review and critical analysis of the literature regarding the contents and physiological effects of coffee related to physical and cognitive performance conducted by experts in the field and selected members of the International Society of Sports Nutrition (ISSN), the following conclusions represent the official Position of the Society:(1) Coffee is a complex matrix of hundreds of compounds. These are consumed with broad variability based upon serving size, bean type (e.g. common Arabica vs. Robusta), and brew method (water temperature, roasting method, grind size, time, and equipment).(2) Coffee's constituents, including but not limited to caffeine, have neuromuscular, antioxidant, endocrine, cognitive, and metabolic (e.g. glucose disposal and vasodilation) effects that impact exercise performance and recovery.(3) Coffee's physiologic effects are influenced by dose, timing, habituation to a small degree (to coffee or caffeine), nutrigenetics, and potentially by gut microbiota differences, sex, and training status.(4) Coffee and/or its components improve performance across a temporal range of activities from reaction time, through brief power exercises, and into the aerobic time frame in most but not all studies. These broad and varied effects have been demonstrated in men (mostly) and in women, with effects that can differ from caffeine ingestion, per se. More research is needed.(5) Optimal dosing and timing are approximately two to four cups (approximately 473-946 ml or 16-32 oz.) of typical hot-brewed or reconstituted instant coffee (depending on individual sensitivity and body size), providing a caffeine equivalent of 3-6 mg/kg (among other components such as chlorogenic acids at approximately 100-400 mg per cup) 60 min prior to exercise.(6) Coffee has a history of controversy regarding side effects but is generally considered safe and beneficial for healthy, exercising individuals in the dose range above.(7) Coffee can serve as a vehicle for other dietary supplements, and it can interact with nutrients in other foods.(8) A dearth of literature exists examining coffee-specific ergogenic and recovery effects, as well as variability in the operational definition of "coffee," making conclusions more challenging than when examining caffeine in its many other forms of delivery (capsules, energy drinks, "pre-workout" powders, gum, etc.).
Collapse
Affiliation(s)
- Lonnie M Lowery
- Walsh University, Department of Exercise Science, North Canton, OH, USA
- Nutrition, Exercise and Wellness Associates, Cuyahoga Falls, USA
| | - Dawn E Anderson
- Indiana Institute of Technology, Department of Biological and Physical Sciences, Fort Wayne, USA
| | - Kelsey F Scanlon
- Walsh University, Department of Exercise Science, North Canton, OH, USA
| | - Abigail Stack
- University of Mount Union, Department of Exercise, Nutrition, and Sport Science Alliance, USA
| | | | - Sara C Campbell
- The State University of New Jersey, Department of Kinesiology and Health, Rutgers, New Brunswick, USA
| | - Chad M Kerksick
- Lindenwood University, Exercise and Performance Nutrition Laboratory, St. Charles, USA
| | | | | | - Trisha A VanDusseldorp
- Bonafide Health, LLC p/b JDS Therapeutics, Harrison, USA
- Jacksonville University, Department of Health and Exercise Sciences, Jacksonville, USA
| | - Douglas S Kalman
- Nova Southeastern University, Department of Nutrition, College of Osteopathic Medicine, Fort Lauderdale, USA
| | - Bill I Campbell
- University of South Florida, Performance & Physique Enhancement Laboratory, Tampa, USA
| | - Richard B Kreider
- Texas A&M University, Exercise & Sport Nutrition Lab, Department of Kinesiology and Sports Management, College Station, USA
| | - Jose Antonio
- Nova Southeastern University, Department of Health and Human Performance, Davie, USA
| |
Collapse
|
7
|
Taheri Karami G, Hemmatinafar M, Koushkie Jahromi M, Nemati J, Niknam A. Repeated mouth rinsing of coffee improves the specific-endurance performance and jump performance of young male futsal players. J Int Soc Sports Nutr 2023; 20:2214108. [PMID: 37190757 DOI: 10.1080/15502783.2023.2214108] [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: 05/17/2023] Open
Abstract
BACKGROUND Mouth-rinsing with ergogenic solutions such as carbohydrate and caffeinated drinks has been considered among athletes as a practical nutritional strategy. Therefore, this study aimed to determine the effect of repeated coffee mouth-rinsing (CMR) doses on specific performances of futsal players. METHOD Twenty-four male futsal players randomly participated in this randomized, double-blind, and crossover design study. During the intervention, participants were randomly placed in four different conditions including 1. low-dose CMR (LDC, n = 6, ~60 mg caffeine); 2. high-dose CMR (HDC, n = 6, ~125 mg caffeine); 3. decaffeinated CMR (PLA, n = 6, ~10 mg caffeine); and 4. no CMR (CON, n = 6). Vertical jump height was measured at baseline, baseline after CMR (baseline-CMR), immediately after the intermittent futsal endurance test (FIET) (IA-FIET), 5 min after the FIET (5"A-FIET) and 10 min after the FIET (10"A-FIET). Perceived fatigue was also measured by visual analogue scale (VAS) at baseline, IA-FIET, 5"A-FIET, and 10"A-FIET. CMR was also performed at baseline, during FIET (Repeated between levels), and 10'A-FIET. The collected data were analyzed (with SPSS software) by one- and two-way repeated measure ANOVA and Bonferroni post hoc test at P < 0.05 level. RESULTS The findings of the present study illustrated that the perceived fatigue in IA-FIET increased significantly compared to the baseline which was accompanied by a significant decrease in 5"A-FIET and 10"A-FIET compared to IA-FIET (P < 0.05), and no significant difference was observed between conditions in the baseline, IA-FIET, 5"A-FIET, and 10"A-FIET (P > 0.05). However, HDC and LDC rose significantly the distance covered in FIET compared to CON and PLA (P < 0.05). In addition, HDC increased the FIET performance more than LDC (P < 0.05). Although there was no difference between any of the conditions at baseline (P > 0.05), baseline-CMR increased significantly the vertical jump height (P < 0.05). At IA-FIET, vertical jump height decreased to baseline levels in CMR conditions but increased in 5"A-FIET, which remained constant until 10"A-FIET (P < 0.05). In addition, vertical jump height in HDC and LDC conditions was significantly higher than CON in IA-FIET, 5"A-FIET, and 10"A-FIET. CONCLUSION This study showed that repeated CMR with low and high doses is a useful strategy to improve specific futsal performance. However, higher dose CMR appears to have more profound effects on performance improvement than lower doses.
Collapse
Affiliation(s)
- Ghasem Taheri Karami
- Department of Sport Science, Faculty of Education and Psychology, Shiraz University, Shiraz, Iran
| | - Mohammad Hemmatinafar
- Department of Sport Science, Faculty of Education and Psychology, Shiraz University, Shiraz, Iran
| | - Maryam Koushkie Jahromi
- Department of Sport Science, Faculty of Education and Psychology, Shiraz University, Shiraz, Iran
| | | | - Alireza Niknam
- Department of Sport Science, Faculty of Education and Psychology, Shiraz University, Shiraz, Iran
| |
Collapse
|
8
|
Nemati J, Hemmatinafar M, Niknam A, Nikahd M, Zeighami N, Imanian B, Safari K, Jahaniboushehri N, Suzuki K. Effects of Different Doses of Caffeine Supplementation on Collegiate Male Volleyball Players' Specific Performance and Skills: A Randomized, Double-Blind, Placebo-Controlled, Crossover Study. Nutrients 2023; 15:4049. [PMID: 37764832 PMCID: PMC10536286 DOI: 10.3390/nu15184049] [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: 08/21/2023] [Revised: 09/08/2023] [Accepted: 09/15/2023] [Indexed: 09/29/2023] Open
Abstract
BACKGROUND The improvement of performance and skill indices of volleyball players can affect their success rate. Therefore, the present study aimed to evaluate the effects of acute caffeine supplementation of varied doses on collegiate volleyball players' specific performance and skills. METHOD This research was a randomized, double-blind, crossover design study in which 15 male volleyball players aged 18 to 25 years participated voluntarily. Participants were randomly placed in three different conditions, including 3 mg of caffeine per kilogram of body weight (C3), 6 mg of caffeine per kilogram of body weight (C6), and a placebo (PLA) with a one-week wash-out period between exercise trials. The supplement was taken 60 min before each exercise session. Ball throwing, hand movement speed, agility, Sargent's jump and handgrip, and attacking and serving skill tests were measured and analyzed to check the performance and skill of the volleyball players. RESULTS This study showed a significant increase in agility test in C6 compared with the PLA condition (p = 0.02). Additionally, there was a significant improvement in Sargent's jump in C6 compared with PLA (p = 0.00) and C6 compared with the C3 condition (p = 0.00). Also, attacking skill significantly increased in C3 compared with PLA (p = 0.00) and C6 compared with the PLA condition (p = 0.00). In addition, there was a significant increase in serving skill for C6 compared with PLA (p = 0.00) and C3 (p = 0.00). However, there were no significant differences in hand movement speed (p = 0.06), left handgrip (p = 0.85), right handgrip (p = 0.47), or medicine ball throwing (p = 0.22) between the three conditions. CONCLUSIONS In conclusion, the findings of the current study suggested that a higher dose of caffeine compared with a lower dose may be more effective in movements requiring lower-body explosive power and the ability to change direction. Also, according to the findings, it seems that caffeine can lead to the improvement of complex skills, such as serving and attacking in volleyball.
Collapse
Affiliation(s)
- Javad Nemati
- Department of Sport Science, Faculty of Education and Psychology, Shiraz University, Shiraz 71345, Iran
| | - Mohammad Hemmatinafar
- Department of Sport Science, Faculty of Education and Psychology, Shiraz University, Shiraz 71345, Iran
| | - Alireza Niknam
- Department of Sport Science, Faculty of Education and Psychology, Shiraz University, Shiraz 71345, Iran
| | - Mohammad Nikahd
- Department of Sport Science, Faculty of Education and Psychology, Shiraz University, Shiraz 71345, Iran
| | - Narjes Zeighami
- Department of Sport Science, Faculty of Education and Psychology, Shiraz University, Shiraz 71345, Iran
| | - Babak Imanian
- Department of Sport Science, Faculty of Education and Psychology, Shiraz University, Shiraz 71345, Iran
| | - Kousar Safari
- Department of Sport Science, Faculty of Education and Psychology, Shiraz University, Shiraz 71345, Iran
| | - Nima Jahaniboushehri
- Department of Sport Science, Faculty of Education and Psychology, Shiraz University, Shiraz 71345, Iran
| | - Katsuhiko Suzuki
- Faculty of Sport Sciences, Waseda University, 2-579-15 Mikajima, Tokorozawa 359-1192, Japan
| |
Collapse
|
9
|
Villa-Sánchez B, Gandolfi M, Emadi Andani M, Valè N, Rossettini G, Polesana F, Menaspà Z, Smania N, Tinazzi M, Fiorio M. Placebo effect on gait: a way to reduce the dual-task cost in older adults. Exp Brain Res 2023; 241:1501-1511. [PMID: 37085646 DOI: 10.1007/s00221-023-06620-x] [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: 11/30/2022] [Accepted: 04/15/2023] [Indexed: 04/23/2023]
Abstract
The ability to perform two tasks simultaneously is essential for daily activities. In older adults, this ability is markedly reduced, as evidenced by the dual-task cost on gait. Preliminary evidences indicate that the dual-task cost can be influenced by different types of manipulations. Here, we explored the effectiveness of a new approach to reduce the dual-task cost, based on the placebo effect, a psychobiological phenomenon whereby a positive outcome follows the administration of an inert device thought to be effective. Thirty-five healthy older adults were asked to walk on a sensorized carpet (single-task condition) and to walk while counting backward (dual-task condition) in two sessions (pre-test and post-test). A placebo group, randomly selected, underwent sham transcranial direct current stimulation over the supraorbital areas between sessions, along with information about its positive effects on concentration and attention. A control group did not receive any intervention between sessions. The dual-task cost was significantly reduced in the placebo group at the post-test session compared to the pre-test for several gait parameters (Cohen's d > 1.43). At the post-test session, the dual-task cost was also lower in the placebo group than in the control group (d > 0.73). Cognitive (number of subtractions and number of errors) and subjective (perceived mental fatigability) variables remained stable across sessions. The reduced dual-task cost in the placebo group could indicate the ability to re-establish the allocation of attentional resources between tasks. These findings could contribute to the development of cognitive strategies that leverage positive expectations to boost motor control in older adults.
Collapse
Affiliation(s)
- Bernardo Villa-Sánchez
- Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Via Casorati 43, 37131, Verona, Italy.
- Center for Mind/Brain Sciences (CIMeC), University of Trento, Corso Bettini, 31, 38068, Rovereto, Italy.
| | - Marialuisa Gandolfi
- Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Via Casorati 43, 37131, Verona, Italy
- Neuromotor and Cognitive Rehabilitation Research Center (CRRNC), University of Verona, Verona, Italy
| | - Mehran Emadi Andani
- Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Via Casorati 43, 37131, Verona, Italy
| | - Nicola Valè
- Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Via Casorati 43, 37131, Verona, Italy
- Neuromotor and Cognitive Rehabilitation Research Center (CRRNC), University of Verona, Verona, Italy
| | - Giacomo Rossettini
- Department of Neuroscience, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health, University of Genova, Genoa, Italy
| | - Federico Polesana
- Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Via Casorati 43, 37131, Verona, Italy
| | - Zoe Menaspà
- Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Via Casorati 43, 37131, Verona, Italy
- Neuromotor and Cognitive Rehabilitation Research Center (CRRNC), University of Verona, Verona, Italy
| | - Nicola Smania
- Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Via Casorati 43, 37131, Verona, Italy
- Neuromotor and Cognitive Rehabilitation Research Center (CRRNC), University of Verona, Verona, Italy
| | - Michele Tinazzi
- Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Via Casorati 43, 37131, Verona, Italy
| | - Mirta Fiorio
- Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Via Casorati 43, 37131, Verona, Italy.
| |
Collapse
|
10
|
Nasser N, Zorgati H, Chtourou H, Guimard A. Cold water immersion after a soccer match: Does the placebo effect occur? Front Physiol 2023; 14:1062398. [PMID: 36895634 PMCID: PMC9988943 DOI: 10.3389/fphys.2023.1062398] [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: 10/05/2022] [Accepted: 02/10/2023] [Indexed: 02/25/2023] Open
Abstract
Although cold water immersion (CWI) is one of the most widely used post-exercise strategies to accelerate recovery processes, the benefits of CWI may be associated with placebo effects. This study aimed to compare the effects of CWI and placebo interventions on time course of recovery after the Loughborough Intermittent Shuttle Test (LIST). In a randomized, counterbalanced, crossover study, twelve semi-professional soccer players (age 21.1 ± 2.2 years, body mass 72.4 ± 5.9 kg, height 174.9 ± 4.6 cm, V ˙ O2max 56.1 ± 2.3 mL/min/kg) completed the LIST followed by CWI (15 min at 11°C), placebo (recovery Pla beverage), and passive recovery (Rest) over three different weeks. Creatine kinase (CK), C-reactive protein (CRP), uric acid (UA), delayed onset muscle soreness (DOMS), squat jump (SJ), countermovement jump (CMJ), 10-m sprint (10 mS), 20-m sprint (20 mS) and repeated sprint ability (RSA) were assessed at baseline and 24 and 48 h after the LIST. Compared to baseline, CK concentration was higher at 24 h in all conditions (p < 0.01), while CRP was higher at 24 h only in CWI and Rest conditions (p < 0.01). UA was higher for Rest condition at 24 and 48 h compared to Pla and CWI conditions (p < 0.001). DOMS score was higher for Rest condition at 24 h compared to CWI and Pla conditions (p = 0.001), and only to Pla condition at 48 h (p = 0.017). SJ and CMJ performances decreased significantly after the LIST in Rest condition (24 h: -7.24%, p = 0.001 and -5.45%, p = 0.003 respectively; 48 h: -9.19%, p < 0.001 and -5.70% p = 0.002 respectively) but not in CWI and Pla conditions. 10 mS and RSA performance were lower for Pla at 24 h compared to CWI and Rest conditions (p < 0.05), while no significant change was observed for 20 mS time. These data suggests that CWI and Pla intervention were more effective than the Rest conditions in recovery kinetics of muscle damage markers and physical performance. Furthermore, the effectiveness of CWI would be explained, at least in part, by the placebo effect.
Collapse
Affiliation(s)
- Nidhal Nasser
- Activité Physique, Sport et Santé, UR18JS01, Observatoire National du Sport, Tunis, Tunisie.,Institut Supérieur du Sport et de l'Education Physique de Sfax, Université de Sfax, Sfax, Tunisie
| | - Houssem Zorgati
- Activité Physique, Sport et Santé, UR18JS01, Observatoire National du Sport, Tunis, Tunisie.,Institut Supérieur du Sport et de l'Education Physique de Gafsa, Université de Gafsa, Gafsa, Tunisie
| | - Hamdi Chtourou
- Activité Physique, Sport et Santé, UR18JS01, Observatoire National du Sport, Tunis, Tunisie.,Institut Supérieur du Sport et de l'Education Physique de Sfax, Université de Sfax, Sfax, Tunisie
| | - Alexandre Guimard
- Université Sorbonne Paris Nord, Hypoxie et Poumon, H&P, INSERM, UMR 1272, Bobigny, France.,Département STAPS, Université Sorbonne Paris Nord, Bobigny, France
| |
Collapse
|
11
|
Choi JI, Lee YL, Lee SY. Efficacy and safety of fermented Prunus mume vinegar on fatigue improvement in adults with unexplained fatigue: A randomized controlled trial. Front Nutr 2022; 9:990418. [PMID: 36438753 PMCID: PMC9682036 DOI: 10.3389/fnut.2022.990418] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2022] [Accepted: 10/19/2022] [Indexed: 11/11/2022] Open
Abstract
Background The accumulation of fatigue leads to reduced physical, emotional, psychological, and social functions. Objectives Fermented Prunus mume vinegar (PV) improves fatigue in animals; however, studies in humans have not been conducted. We aimed to examine the effects and safety of consuming fermented PV for 8 weeks on fatigue indices in adults with unexplained fatigue while considering the placebo effect. Methods A randomized, double-blind, placebo-controlled trial was conducted in adults of >19 years, who were diagnosed with unexplained fatigue for at least 1 month. Eighty participants were randomly assigned to receive daily 70 mL of fermented PV (2.56 mg/g, chlorogenic acid, and 15.3 mg/g, citric acid) or a placebo for 8 weeks. At baseline and 4 and 8 weeks after treatment, the participants were visited for blood tests (liver enzyme, glucose, creatinine, lactate, malondialdehyde [MDA], and creatine kinase [CK]) and questionnaires (Fatigue Severity Scale [FSS], fatigue visual analog scale [VAS], Beck Depression Inventory [BDI], the Korean version of the Brief Encounter Psychosocial Instrument [BEPSI-K], EQ-5D-3L, and EQ-VAS]). Results Fermented PV supplementation for 8 weeks did not remarkably improve the fatigue indices when compared to placebo. Additionally, differences in fatigue VAS, BDI, BEPSI-K, EQ-5D-3L, EQ-VAS, lactate, CK, and MDA concentrations between the groups were not observed. However, FSS had positively correlated with fatigue VAS, BDI, and BEPSI-K, whereas it was negatively correlated with EQ-5D-3L and EQ-VAS at the baseline and 8 weeks. None of the participants reported adverse events. Conclusion The efficacy of fermented PV did not exceed the efficacy of placebo in adults with unexplained fatigue. Clinical trial registration [ClinicalTrials.gov], identifier [NCT04319692].
Collapse
Affiliation(s)
- Jung In Choi
- Family Medicine Clinic and Biomedical Research Institute, Pusan National University Yangsan Hospital, Yangsan, South Korea
| | - Ye Li Lee
- Integrated Research Institute for Natural Ingredients and Functional Foods, Yangsan, South Korea
| | - Sang Yeoup Lee
- Family Medicine Clinic and Biomedical Research Institute, Pusan National University Yangsan Hospital, Yangsan, South Korea
- Integrated Research Institute for Natural Ingredients and Functional Foods, Yangsan, South Korea
- Department of Medical Education, Pusan National University School of Medicine, Yangsan, South Korea
| |
Collapse
|
12
|
Fiorio M, Braga M, Marotta A, Villa-Sánchez B, Edwards MJ, Tinazzi M, Barbiani D. Functional neurological disorder and placebo and nocebo effects: shared mechanisms. Nat Rev Neurol 2022; 18:624-635. [PMID: 36075980 DOI: 10.1038/s41582-022-00711-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/04/2022] [Indexed: 11/09/2022]
Abstract
Functional neurological disorder (FND) is characterized by neurological symptoms that cannot be explained by a structural neurological cause. Among the different aetiological models that have been proposed for FND, of note is the Bayesian predictive coding model, which posits that perception relies on top-down cortical predictions (priors) to infer the source of incoming sensory information. This model can also apply to non-pathological experiences, such as placebo and nocebo effects, wherein sensory information is shaped by prior expectations and learning. To date, most studies of the relationship between placebo and nocebo effects and FND have focused on the use of placebos for diagnosis and treatment of FND. Here, we propose that this relationship might go beyond diagnosis and therapy. We develop a framework in which shared cognitive, personality and neuroanatomical factors justify the consideration of a deeper link between FND and placebo and nocebo effects. This new perspective might offer guidance for clarification of the pathogenesis of FND and for the identification of potential biomarkers and therapeutic targets.
Collapse
Affiliation(s)
- Mirta Fiorio
- Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Verona, Italy.
| | - Miriam Braga
- Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Verona, Italy
| | - Angela Marotta
- Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Verona, Italy
| | | | - Mark J Edwards
- Institute of Molecular and Clinical Sciences, St George's University of London, London, UK
| | - Michele Tinazzi
- Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Verona, Italy
| | - Diletta Barbiani
- Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Verona, Italy
| |
Collapse
|
13
|
Ahmadzad-Asl M, Davoudi F, Mohamadi S, Hadi F, Nejadghaderi SA, Mirbehbahani SH, Jabbarinejad R, Saneh S, Arshadi M, Naserbakht M, Sinyor M, Kabir A, Shamshiri A. Systematic review and meta-analysis of the placebo effect in panic disorder: Implications for research and clinical practice. Aust N Z J Psychiatry 2022; 56:1130-1141. [PMID: 34996304 DOI: 10.1177/00048674211068793] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
OBJECTIVE This review aimed to measure the degree of placebo response in panic disorder. DATA SOURCES We searched major databases up to 31 January 2021, for randomized pharmacotherapy trials published in English. STUDY SELECTION A total of 43 studies met inclusion criteria to be in the analysis (with 174 separate outcome measurements). DATA EXTRACTION Changes in outcome measures from baseline in the placebo group were used to estimate modified Cohen's d effect size. RESULTS A total of 43 trials (2392 subjects, 174 outcomes using 27 rating scales) were included in the meta-analysis. Overall placebo effect size was 0.57 (95% confidence interval = [0.50, 0.64]), heterogeneity (I2: 96.3%). Higher placebo effect size was observed among clinician-rated scales compared to patient reports (0.75 vs 0.35) and among general symptom and anxiety scales compared to panic symptoms and depression scales (0.92 and 0.64 vs 0.56 and 0.54, respectively). There was an upward trend in effect size over the publication period (r = 0.02, p = 0.002) that was only significant among clinician-rated scales (r = 0.02, p = 0.011). There was no significant publication bias, Egger's test (p = 0.08). CONCLUSION We observed a substantial placebo effect size in panic disorder. This effect was more prominent for some aspects of panic disorder psychopathology than for others and was correlated with the source of the assessment and publication year. This finding has implications both for research design, to address the heterogeneity and diversity in placebo responses, and for clinical practice to ensure optimal quality of care. SYSTEMATIC REVIEW REGISTRATION NUMBER PROSPERO, CRD42019125979.
Collapse
Affiliation(s)
- Masoud Ahmadzad-Asl
- Department of Psychiatry, Sunnybrook Health Sciences Centre, Toronto, ON, Canada.,Department of Psychiatry, University of Toronto, Toronto, ON, Canada
| | - Farnoush Davoudi
- Preventive Medicine and Public Health Research Center, Psychosocial Health Research Institute, Department of Community and Family Medicine, School of Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - Safoura Mohamadi
- Mental Health Research Center, Iran University of Medical Sciences, Tehran, Iran
| | - Fatemeh Hadi
- Mental Health Research Center, Iran University of Medical Sciences, Tehran, Iran
| | | | | | - Roxana Jabbarinejad
- Cognitive Neuroscience Laboratory, Brain Injury Research, Think+Speak Lab, Shirley Ryan Ability Lab, Northwestern University, Chicago, IL, USA
| | - Sadaf Saneh
- Mental Health Research Center, Iran University of Medical Sciences, Tehran, Iran
| | - Mahdi Arshadi
- Department of Psychiatry & Behavioral Sciences, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | - Morteza Naserbakht
- Mental Health Research Center, Iran University of Medical Sciences, Tehran, Iran
| | - Mark Sinyor
- Department of Psychiatry, Sunnybrook Health Sciences Centre, Toronto, ON, Canada.,Department of Psychiatry, University of Toronto, Toronto, ON, Canada
| | - Ali Kabir
- Education Development Center, Iran University of Medical Sciences, Tehran, Iran
| | - Ahmadreza Shamshiri
- Department of Epidemiology, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
| |
Collapse
|
14
|
Brietzke C, Cesario JCS, Hettinga FJ, Pires FO. The reward for placebos: mechanisms underpinning placebo-induced effects on motor performance. Eur J Appl Physiol 2022; 122:2321-2329. [PMID: 36006479 DOI: 10.1007/s00421-022-05029-8] [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: 06/27/2022] [Accepted: 08/16/2022] [Indexed: 11/29/2022]
Abstract
Different from the most popular thinking, the placebo effect is not a purely psychological phenomenon. A body of knowledge from multidisciplinary fields has shown that the expectation of a potential benefit when receiving a treatment induces a cascade of neurochemical-electrophysiological alterations in brain reward areas, including motor-related ones. Alterations in the dopamine, opioid, and glutamate metabolism are the neural representation converting reward-derived declarative forms into an attractive and wanted behavior, thereby changing the activation in reward subcortical and cortical structures involved in motor planning, motor execution, and emotional-cognitive attributes of decision-making. We propose that the expectation of receiving a treatment that is beneficial to motor performance triggers a cascade of activations in brain reward areas that travels from motor planning and motor command areas, passing through corticospinal pathways until driving the skeletal muscles, therefore facilitating the motor performance. Although alternative explanations cannot be totally ruled out, this mechanistic route is robust in explaining the results of placebo-induced effects on motor performance and could lead to novel insights and applications in the exercise sciences. Factors such as sex differences in reward-related mechanisms and aversion-induced nocebo effects should also be addressed.
Collapse
Affiliation(s)
- Cayque Brietzke
- Exercise Psychophysiology Research Group, School of Arts, Sciences and Humanities, University of São Paulo, São Paulo, Brazil.,Human Movement Science and Rehabilitation Program, Federal University of São Paulo, Santos, Brazil
| | - Julio Cesar Silva Cesario
- Exercise Psychophysiology Research Group, School of Arts, Sciences and Humanities, University of São Paulo, São Paulo, Brazil
| | | | - Flavio Oliveira Pires
- Exercise Psychophysiology Research Group, School of Arts, Sciences and Humanities, University of São Paulo, São Paulo, Brazil. .,Human Movement Science and Rehabilitation Program, Federal University of São Paulo, Santos, Brazil. .,Rehabilitation Sciences Program, Faculty of Medicine, University of São Paulo, São Paulo, Brazil.
| |
Collapse
|
15
|
Painelli VDS, Brietzke C, Franco-Alvarenga PE, Canestri R, Vinícius Í, Pires FO. A Narrative Review of Current Concerns and Future Perspectives of the Carbohydrate Mouth Rinse Effects on Exercise Performance. SAGE Open Med 2022; 10:20503121221098120. [PMID: 35615525 PMCID: PMC9125602 DOI: 10.1177/20503121221098120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2021] [Accepted: 04/13/2022] [Indexed: 11/16/2022] Open
Abstract
Previous systematic reviews have confirmed that carbohydrate (CHO) mouth rinse
may boost physical exercise performance, despite some methodological aspects
likely affecting its ergogenic effect. In this review, we discussed if the
exercise mode, pre-exercise fasting status, CHO solutions concentration, CHO
solutions temperature, mouth rinse duration, and CHO placebo effects may
potentially reduce the CHO mouth rinse ergogenic effect, suggesting possible
solutions to manage these potential confounders. The effectiveness of CHO mouth
rinse as a performance booster is apparently related to the origin of the
exercise-induced neuromuscular fatigue, as CHO mouth rinse unequivocally
potentiates endurance rather than sprint and strength exercises performance.
Furthermore, ergogenic effects have been greater in fasting than fed state,
somehow explaining the varied magnitude of the CHO mouth rinse effects in
exercise performance. In this regard, the CHO solution concentration and
temperature, as well as the mouth rinse duration, may have increased the
variability observed in CHO mouth rinse effects in fasting and fed state.
Finally, placebo effects have challenged the potential of the CHO mouth rinse as
an ergogenic aid. Therefore, we suggest that future studies should consider
methodological controls such as sample size and sample homogeneity, proper
familiarization with experimental procedures, and the use of alternative placebo
designs to provide unbiased evidence regarding the potential of the CHO mouth
rinse as an ergogenic aid.
Collapse
Affiliation(s)
- Vitor de Salles Painelli
- Exercise Psychophysiology Research Group, School of Arts, Sciences and Humanities, University of São Paulo, São Paulo, Brazil
- Strength Training Study and Research Group, Institute of Health Sciences, Paulista University, São Paulo, Brazil
| | - Cayque Brietzke
- Exercise Psychophysiology Research Group, School of Arts, Sciences and Humanities, University of São Paulo, São Paulo, Brazil
- Human Movement Science and Rehabilitation Program, Federal University of São Paulo, Santos, Brazil
| | - Paulo Estevão Franco-Alvarenga
- Exercise Psychophysiology Research Group, School of Arts, Sciences and Humanities, University of São Paulo, São Paulo, Brazil
- Human Movement Science and Rehabilitation Program, Federal University of São Paulo, Santos, Brazil
| | - Raul Canestri
- Exercise Psychophysiology Research Group, School of Arts, Sciences and Humanities, University of São Paulo, São Paulo, Brazil
| | - Ítalo Vinícius
- Exercise Psychophysiology Research Group, School of Arts, Sciences and Humanities, University of São Paulo, São Paulo, Brazil
| | - Flávio Oliveira Pires
- Exercise Psychophysiology Research Group, School of Arts, Sciences and Humanities, University of São Paulo, São Paulo, Brazil
- Human Movement Science and Rehabilitation Program, Federal University of São Paulo, Santos, Brazil
| |
Collapse
|
16
|
Skvortsova A, Cohen Rodrigues T, de Buisonjé D, Kowatsch T, Santhanam P, Veldhuijzen DS, van Middendorp H, Evers A. Increasing the Effectiveness of a Physical Activity Smartphone Intervention With Positive Suggestions: Randomized Controlled Trial. J Med Internet Res 2022; 24:e32130. [PMID: 35230245 PMCID: PMC8924786 DOI: 10.2196/32130] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Revised: 09/29/2021] [Accepted: 12/07/2021] [Indexed: 01/19/2023] Open
Abstract
Background eHealth interventions have the potential to increase the physical activity of users. However, their effectiveness varies, and they often have only short-term effects. A possible way of enhancing their effectiveness is to increase the positive outcome expectations of users by giving them positive suggestions regarding the effectiveness of the intervention. It has been shown that when individuals have positive expectations regarding various types of interventions, they tend to benefit from these interventions more. Objective The main objective of this web-based study is to investigate whether positive suggestions can change the expectations of participants regarding the effectiveness of a smartphone physical activity intervention and subsequently enhance the number of steps the participants take during the intervention. In addition, we study whether suggestions affect perceived app effectiveness, engagement with the app, self-reported vitality, and fatigue of the participants. Methods This study involved a 21-day fully automated physical activity intervention aimed at helping participants to walk more steps. The intervention was delivered via a smartphone-based app that delivered specific tasks to participants (eg, setting activity goals or looking for social support) and recorded their daily step count. Participants were randomized to either a positive suggestions group (69/133, 51.9%) or a control group (64/133, 48.1%). Positive suggestions emphasizing the effectiveness of the intervention were implemented in a web-based flyer sent to the participants before the intervention. Suggestions were repeated on days 8 and 15 of the intervention via the app. Results Participants significantly increased their daily step count from baseline compared with 21 days of the intervention (t107=−8.62; P<.001) regardless of the suggestions. Participants in the positive suggestions group had more positive expectations regarding the app (B=−1.61, SE 0.47; P<.001) and higher expected engagement with the app (B=3.80, SE 0.63; P<.001) than the participants in the control group. No effects of suggestions on the step count (B=−22.05, SE 334.90; P=.95), perceived effectiveness of the app (B=0.78, SE 0.69; P=.26), engagement with the app (B=0.78, SE 0.75; P=.29), and vitality (B=0.01, SE 0.11; P=.95) were found. Positive suggestions decreased the fatigue of the participants during the 3 weeks of the intervention (B=0.11, SE 0.02; P<.001). Conclusions Although the suggestions did not affect the number of daily steps, they increased the positive expectations of the participants and decreased their fatigue. These results indicate that adding positive suggestions to eHealth physical activity interventions might be a promising way of influencing subjective but not objective outcomes of interventions. Future research should focus on finding ways of strengthening the suggestions, as they have the potential to boost the effectiveness of eHealth interventions. Trial Registration Open Science Framework 10.17605/OSF.IO/CWJES; https://osf.io/cwjes
Collapse
Affiliation(s)
- Aleksandrina Skvortsova
- Department of Psychology, McGill University, Montreal, QC, Canada.,Health, Medical and Neuropsychology, Faculty of Social and Behavioural Sciences, Leiden, Netherlands
| | - Talia Cohen Rodrigues
- Health, Medical and Neuropsychology, Faculty of Social and Behavioural Sciences, Leiden, Netherlands
| | - David de Buisonjé
- Health, Medical and Neuropsychology, Faculty of Social and Behavioural Sciences, Leiden, Netherlands
| | - Tobias Kowatsch
- Centre for Digital Health Interventions, Department of Management, Technology, and Economics, ETH Zurich, Zurich, Switzerland.,Centre for Digital Health Interventions, Institute of Technology Management, University of St.Gallen, St.Gallen, Switzerland
| | - Prabhakaran Santhanam
- Centre for Digital Health Interventions, Department of Management, Technology, and Economics, ETH Zurich, Zurich, Switzerland
| | - Dieuwke S Veldhuijzen
- Health, Medical and Neuropsychology, Faculty of Social and Behavioural Sciences, Leiden, Netherlands
| | - Henriët van Middendorp
- Health, Medical and Neuropsychology, Faculty of Social and Behavioural Sciences, Leiden, Netherlands
| | - Andrea Evers
- Health, Medical and Neuropsychology, Faculty of Social and Behavioural Sciences, Leiden, Netherlands.,Department of Psychiatry, Leiden University Medical Center, Leiden, Netherlands.,Medical Delta, Leiden University, Technical University Delft and Erasmus University, Leiden, Delft, Rotterdam, Netherlands
| |
Collapse
|
17
|
Delang N, Irwin C, Cox GR, McCartney D, Desbrow B. Belief in caffeine's ergogenic effect on cognitive function and endurance performance: A sham dose-response study. Hum Psychopharmacol 2021; 36:e2792. [PMID: 33939237 DOI: 10.1002/hup.2792] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/26/2021] [Accepted: 04/13/2021] [Indexed: 11/07/2022]
Abstract
This study aimed to determine if belief in caffeine's ergogenic potential influences choice reaction time (CRT) and/or running performance. Twenty-nine healthy individuals (23.7 ± 5 years, 16 males) completed two trials (one week apart). Before the trials, participants indicated their "belief" in caffeine's ergogenic effects and previous "experience" using caffeine for performance. On arrival, participants randomly received either sham "Low (100mg; LD)" or "High (300mg; HD)" dose caffeine capsules 30-min before commencing the CRT test, followed by a 10km run. Paired samples t-tests determined differences between trials for CRT latency (Ex-Gaussian analysis; μ-, σ- and τ-) and running performance using the entire cohort and sub-groups exhibiting strong "beliefs"+/-"experience". Sham caffeine dose did not influence CRT (μ-, σ- and τ-respectively, LD: 400 ± 53ms vs. HD: 388 ± 41ms; LD: 35 ± 18ms vs. HD: 34 ± 17ms; LD: 50 ± 24ms vs. HD: 52 ± 19ms, all p's > 0.05). Neither belief (n = 6), nor belief + experience (n = 4), influenced this effect. Furthermore, caffeine dose did not influence run time (LD: 49.05 ± 3.75min vs. HD: 49.06 ± 3.85min, p = 0.979). Belief (n = 9) (LD: 48.93 ± 3.71min vs. HD: 48.9 ± 3.52min, p = 0.976), and belief + experience (n = 6) (LD: 48.68 ± 1.87min vs. HD: 49.55 ± 1.75min, p = 0.386) didn't influence this effect. A dose-response to sham caffeine ingestion was not evident on cognitive or endurance performance in healthy individuals, regardless of their convictions about caffeine's ergogenicity.
Collapse
Affiliation(s)
- Nathan Delang
- School of Allied Health Sciences, Griffith University, Gold Coast, Queensland, Australia
| | - Christopher Irwin
- School of Allied Health Sciences, Griffith University, Gold Coast, Queensland, Australia.,The Hopkins Centre, Menzies Health Institute Queensland, Griffith University, Gold Coast, Queensland, Australia
| | - Gregory R Cox
- Faculty of Health Sciences and Medicine, Bond University, Gold Coast, Queensland, Australia
| | - Danielle McCartney
- School of Allied Health Sciences, Griffith University, Gold Coast, Queensland, Australia
| | - Ben Desbrow
- School of Allied Health Sciences, Griffith University, Gold Coast, Queensland, Australia
| |
Collapse
|
18
|
Davis AJ, Crittenden B, Cohen E. Effects of social support on performance outputs and perceived difficulty during physical exercise. Physiol Behav 2021; 239:113490. [PMID: 34139269 DOI: 10.1016/j.physbeh.2021.113490] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Revised: 05/30/2021] [Accepted: 05/31/2021] [Indexed: 12/28/2022]
Abstract
Perceptions of social support influence adaptive self-regulatory processes that maintain health, produce feelings, and motivate behavior. Although associations between sociality and health are increasingly well-understood, there is little systematic research into the effects of social support on fatigue, physical discomfort, exertion, and output regulation in physical activity. We conducted an experimental study to investigate the effect of social support on performance and perceived difficulty in a handgrip force task while controlling for audience and reputational factors. Effects were compared with those of another established psychogenic performance enhancer (a placebo ergogenic supplement). During handgrip trials over varying levels of objective difficulty, participants viewed photographs of a support figure or stranger while in a placebo or control condition. Results revealed a significant main effect of the social support cue on handgrip performance outputs, and a significant interaction with objective trial difficulty - relative to the stranger cue, the support-figure cue significantly increased handgrip performance outputs and the effect was larger in more objectively difficult trials. Moreover, despite producing greater handgrip outputs, participants perceived trials to be significantly less difficult in the social support condition. Though there was a non-significant main effect of placebo (vs. control) on performance outputs, participants perceived trials in the placebo condition to be significantly less difficult. The research contributes new evidence and theory on the role of perceived social support - an important (energetic) resource - in human performance and motivates further enquiry into how cues to support alter perceived effort and performance outputs in strenuous physical challenges.
Collapse
Affiliation(s)
- Arran J Davis
- Institute of Cognitive and Evolutionary Anthropology, University of Oxford, 64 Banbury Road, Oxford, OX2 6PN, United Kingdom.
| | - Ben Crittenden
- Nuffield Department of Clinical Neurosciences, University of Oxford, Level 6, West Wing, John Radcliffe Hospital, Oxford OX3 9DU, United Kingdom
| | - Emma Cohen
- Institute of Cognitive and Evolutionary Anthropology, University of Oxford, 64 Banbury Road, Oxford, OX2 6PN, United Kingdom; Wadham College, Parks Road, Oxford, OX1 3PN, United Kingdom
| |
Collapse
|
19
|
de Souza HLR, Arriel RA, Mota GR, Hohl R, Marocolo M. Does ischemic preconditioning really improve performance or it is just a placebo effect? PLoS One 2021; 16:e0250572. [PMID: 33939730 PMCID: PMC8092792 DOI: 10.1371/journal.pone.0250572] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2021] [Accepted: 04/09/2021] [Indexed: 11/29/2022] Open
Abstract
This study examined the effects of a simultaneous ischemic preconditioning (IPC) and SHAM intervention to reduce the placebo effect due to a priori expectation on the performance of knee extension resistance exercise. Nine moderately trained men were tested in three different occasions. Following the baseline tests, subjects performed a first set of leg extension tests after the IPC (3 X 5 min 50 mmHg above systolic blood pressure) on right thigh and the SHAM (same as IPC, but 20 mmHg) on left thigh. After 48 hours, the subjects performed another set of tests with the opposite applications. Number of repetitions, maximal voluntary isometric contraction (MVIC) and perceptual indicators were analyzed. After IPC and SHAM intervention performed at the same time, similar results were observed for the number of repetitions, with no significant differences between conditions (baseline x IPC x SHAM) for either left (p = 0.274) or right thigh (p = 0.242). The fatigue index and volume load did not show significant effect size after IPC and SHAM maneuvers. In contrast, significant reduction on left tight MVIC was observed (p = 0.001) in SHAM and IPC compared to baseline, but not for right thigh (p = 0.106). Results from the current study may indicate that applying IPC prior to a set of leg extension does not result in ergogenic effects. The placebo effect seems to be related to this technique and its dissociation seems unlikely, therefore including a SHAM or placebo group in IPC studies is strongly recommended.
Collapse
Affiliation(s)
- Hiago L. R. de Souza
- Physiology and Human Performance Research Group, Department of Physiology, Federal University of Juiz de Fora, Juiz de Fora, Minas Gerais, Brazil
| | - Rhaí A. Arriel
- Physiology and Human Performance Research Group, Department of Physiology, Federal University of Juiz de Fora, Juiz de Fora, Minas Gerais, Brazil
| | - Gustavo R. Mota
- Exercise Science, Health and Human Performance Research Group, Department of Sport Sciences, Institute of Health Sciences, Federal University of Triangulo Mineiro, Uberaba, Minas Gerais, Brazil
| | - Rodrigo Hohl
- Physiology and Human Performance Research Group, Department of Physiology, Federal University of Juiz de Fora, Juiz de Fora, Minas Gerais, Brazil
| | - Moacir Marocolo
- Physiology and Human Performance Research Group, Department of Physiology, Federal University of Juiz de Fora, Juiz de Fora, Minas Gerais, Brazil
- * E-mail:
| |
Collapse
|
20
|
Villa-Sánchez B, Emadi Andani M, Cesari P, Fiorio M. The effect of motor and cognitive placebos on the serial reaction time task. Eur J Neurosci 2021; 53:2655-2668. [PMID: 33587782 DOI: 10.1111/ejn.15148] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2020] [Revised: 02/03/2021] [Accepted: 02/05/2021] [Indexed: 11/26/2022]
Abstract
Motor learning is a key component of human motor functions. Repeated practice is essential to gain proficiency over time but may induce fatigue. The aim of this study was to determine whether motor performance and motor learning (as assessed with the serial reaction time task, SRTT) and perceived fatigability (as assessed with subjective scales) are improved after two types of placebo interventions (motor and cognitive). A total of 90 healthy volunteers performed the SRTT with the right hand in three sessions (baseline, training and final). Before the training and the final session, one group underwent a motor-related placebo intervention in which inert electrical stimulation (TENS) was applied over the hand and accompanied by verbal suggestion that it improves movement execution (placebo-TENS). The other group underwent a cognitive-related placebo intervention in which sham transcranial direct current stimulation (tDCS) was delivered to the supraorbital area and accompanied by verbal suggestion that it increases attention (placebo-tDCS). A control group performed the same task without receiving treatment. Overall better performance on the SRTT (not ascribed to sequence-specific learning) was noted for the placebo-TENS group, which also reported less perceived fatigability at the physical level. The same was observed in a subgroup tested 24 hr later. The placebo-tDCS group reported less perceived fatigability, both at the mental and physical level. These findings indicate that motor- and cognitive-related placebo effects differently shape motor performance and perceived fatigability on a repeated motor task.
Collapse
Affiliation(s)
- Bernardo Villa-Sánchez
- Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Verona, Italy
| | - Mehran Emadi Andani
- Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Verona, Italy
| | - Paola Cesari
- Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Verona, Italy
| | - Mirta Fiorio
- Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Verona, Italy
| |
Collapse
|
21
|
Filip-Stachnik A, Krzysztofik M, Kaszuba M, Leońska-Duniec A, Czarny W, Del Coso J, Wilk M. Placebo Effect of Caffeine on Maximal Strength and Strength Endurance in Healthy Recreationally Trained Women Habituated to Caffeine. Nutrients 2020; 12:E3813. [PMID: 33322129 PMCID: PMC7763627 DOI: 10.3390/nu12123813] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2020] [Revised: 12/07/2020] [Accepted: 12/09/2020] [Indexed: 01/22/2023] Open
Abstract
BACKGROUND By using deceptive experimental designs, several investigations have observed that trained individuals may increase their performance when told they were given caffeine, when in fact they received a placebo (i.e., the placebo effect of caffeine). However, most of these investigations on the placebo effect of caffeine used individuals with low caffeine consumption or did not report habitual caffeine consumption, especially in studies analyzing resistance-based exercise. Hence, it is unknown if habitual caffeine consumers benefit from the placebo effect of caffeine on exercise performance. Thus, the aim of the present study was to analyze the placebo effect of caffeine on maximal strength and strength-endurance performance during the bench press exercise (BP) in women with mild-moderate daily consumption of caffeine. METHODS Thirteen resistance-trained women (BP one-repetition maximum (1RM) = 40.0 ± 9.7 kg) habituated to caffeine (4.1 ± 1.7 mg/kg/day) completed a deceptive randomized experimental design with two experimental trials. On one occasion, participants were told that they would receive 6 mg/kg of caffeine but received a placebo (PLAC), and on other occasions, participants did not receive any substance and were told that this was a control situation (CONT). In each experimental trial, participants underwent a 1RM BP test and a strength-endurance test consisting of performing the maximal number of repetitions at 50% of their 1RM. RESULTS In comparison to CONT, PLAC did not enhance 1RM (40.0 ± 10.5 kg vs. 41.0 ± 9.5 kg, respectively; p = 0.10), nor did it enhance the number of repetitions (32.2 ± 5.1 vs. 31.8 ± 4.5; p = 0.66) or mean power (130 ± 34 vs. 121 ± 26; p = 0.08) in the strength-endurance test. CONCLUSION Informing participants that they were given caffeine, when in fact they received a placebo, did not modify any performance variable measured in this investigation. Thus, the use of the placebo effect of caffeine seemed an ineffective strategy to enhance muscle strength and strength endurance during the BP exercise in women with mild-moderate consumption of caffeine.
Collapse
Affiliation(s)
- Aleksandra Filip-Stachnik
- Institute of Sport Sciences, The Jerzy Kukuczka Academy of Physical Education in Katowice, 40-065 Katowice, Poland; (A.F.-S.); (M.K.); (M.K.)
| | - Michal Krzysztofik
- Institute of Sport Sciences, The Jerzy Kukuczka Academy of Physical Education in Katowice, 40-065 Katowice, Poland; (A.F.-S.); (M.K.); (M.K.)
| | - Magdalena Kaszuba
- Institute of Sport Sciences, The Jerzy Kukuczka Academy of Physical Education in Katowice, 40-065 Katowice, Poland; (A.F.-S.); (M.K.); (M.K.)
| | - Agata Leońska-Duniec
- Faculty of Physical Education, Gdansk University of Physical Education and Sport, 80-336 Gdansk, Poland;
| | - Wojciech Czarny
- College of Medical Sciences, Institute of Physical Culture Studies, University of Rzeszow, 35-959 Rzeszow, Poland;
| | - Juan Del Coso
- Centre for Sport Studies, Rey Juan Carlos University, 28942 Fuenlabrada, Spain;
| | - Michal Wilk
- Institute of Sport Sciences, The Jerzy Kukuczka Academy of Physical Education in Katowice, 40-065 Katowice, Poland; (A.F.-S.); (M.K.); (M.K.)
| |
Collapse
|
22
|
Piedimonte A, Barbiani D, Benedetti F, Zamfira DA, Carlino E. The placebo effect in breath holding: a preliminary behavioral investigation. Neurosci Lett 2020; 739:135434. [PMID: 33091438 DOI: 10.1016/j.neulet.2020.135434] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Revised: 10/13/2020] [Accepted: 10/14/2020] [Indexed: 11/28/2022]
Abstract
PURPOSE This study seeks to evaluate effects of expectations and conditioning on dry breath holding. METHODS Sixty healthy volunteers were subdivided into 3 groups and were tested across 4 breath holding trials. Participants of the Control group (C) did not undergo any manipulation. Participants of the placebo (P) and nocebo (N) groups were told that they would inhale O2 (actually sham O2) or CO2 (actually sham CO2) along with opposite information that this would enhance or worsen their breath holding time, respectively. Opposite conditioning paradigms based on false visual feedback were employed to reinforce participants' positive (placebo) and negative (nocebo) beliefs. RESULTS The P group showed the greater increase in breath holding time from baseline to the last trial (p = 0.0001) and the longest breath holding time in the last trial compared to the C group (p = 0.02) and the N group (p = 0.0001). Additionally, in the last trial the P group showed a greater decrease in peripheral oxygen saturation (SpO2) as compared to the C group (p = 0.04) and the N group (p = 0.001). Heart rate (HR) was accelerated in the N group during breath holding (in comparison to the P group [p = 0.04] and C group [p = 0.04]). CONCLUSIONS Psychological components can affect behavioral and physiological parameters in breath holding. This study may inform future research about the role of placebo and nocebo effects for conditions in which critical functions are at play.
Collapse
Affiliation(s)
| | - Diletta Barbiani
- Department of Neuroscience "Rita Levi Montalcini", University of Turin, Italy
| | - Fabrizio Benedetti
- Department of Neuroscience "Rita Levi Montalcini", University of Turin, Italy; Medicine & Physiology of Hypoxia, Plateau Rosa Laboratories, Breuil-Cervinia, Italy, Zermatt, Switzerland
| | | | - Elisa Carlino
- Department of Neuroscience "Rita Levi Montalcini", University of Turin, Italy.
| |
Collapse
|
23
|
Pickering C, Grgic J. A time and a place: A framework for caffeine periodization throughout the sporting year. Nutrition 2020; 82:111046. [PMID: 33277148 DOI: 10.1016/j.nut.2020.111046] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Revised: 09/10/2020] [Accepted: 10/05/2020] [Indexed: 01/02/2023]
Abstract
Caffeine is a well-established ergogenic aid, with its performance-enhancing effects demonstrated across a variety of sports and exercise types. As a result of these ergogenic properties, caffeine is widely used by athletes at all levels around both competition and training. Caffeine exerts its performance benefits through a variety of mechanisms, each of which may be of increased importance at a given stage of training or competition. Additionally, regular caffeine use may diminish the performance-enhancing effects of a subsequent dose of caffeine. Recently, interest in the concept of nutritional periodization has grown. Here we propose a framework for the periodization of caffeine through the sporting year, balancing its training and competition performance-enhancing effects, along with the need to mitigate any negative effects of habituation. Furthermore, the regular use of caffeine within training may support the development of positive beliefs toward caffeine by athletes-potentially serving to enhance future performance through placebo and expectancy mechanisms-as well as allowing for the optimization of individual athlete caffeine strategies. Although future work is required to validate some of the suggestions made, the framework proposed here represents a starting point for athletes to maximize caffeine's performance benefits across the sporting year.
Collapse
Affiliation(s)
- Craig Pickering
- Institute of Coaching and Performance, School of Sport and Wellbeing, University of Central Lancashire, Preston, UK.
| | - Jozo Grgic
- Institute for Health and Sport (IHES), Victoria University, Melbourne, Australia
| |
Collapse
|
24
|
Caffeine Ingestion Enhances Repetition Velocity in Resistance Exercise: A Randomized, Crossover, Double-Blind Study Involving Control and Placebo Conditions. J Hum Kinet 2020; 74:177-183. [PMID: 33312285 PMCID: PMC7706645 DOI: 10.2478/hukin-2020-0023] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
We aimed to examine the effects of placebo and caffeine compared to a control condition on mean velocity in the bench press exercise. Twenty-five resistance-trained men participated in this randomized, crossover, double-blind study. The participants performed the bench press with loads of 50%, 75%, and 90% of one-repetition maximum (1RM), after no supplementation (i.e., control), and after ingesting caffeine (6 mg/kg), and placebo (6 mg/kg of dextrose). At 50% 1RM, there was a significant effect of caffeine on mean velocity compared to control (effect size [ES] = 0.29; p = 0.003), but not when compared to placebo (ES = 0.09; p = 0.478). At 75% 1RM, there was a significant effect of caffeine on mean velocity compared to placebo (ES = 0.34; p = 0.001), and compared to control (ES = 0.32; p < 0.001). At 90% 1RM, there was a significant effect of caffeine on mean velocity compared to placebo (ES = 0.36; p < 0.001), and compared to control (ES = 0.46; p < 0.001). There was no significant difference between placebo and control in any of the analyzed outcomes. When evaluated pre-exercise and post-exercise, 20% to 44% and 28% to 52% of all participants identified caffeine and placebo trials beyond random chance, respectively. Given that the blinding of the participants was generally effective, and that there were no significant ergogenic effects of placebo ingestion, the improvements in performance following caffeine ingestion can be mainly attributed to caffeine’s physiological mechanisms of action.
Collapse
|
25
|
Al‐Moraissi EA, Alradom J, Aladashi O, Goddard G, Christidis N. Needling therapies in the management of myofascial pain of the masticatory muscles: A network meta‐analysis of randomised clinical trials. J Oral Rehabil 2020; 47:910-922. [DOI: 10.1111/joor.12960] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2019] [Revised: 01/31/2020] [Accepted: 03/04/2020] [Indexed: 02/07/2023]
Affiliation(s)
| | - Jabr Alradom
- Department of Oral and Maxillofacial Surgery Thamar University Thamar Yemen
| | - Omar Aladashi
- Department of Oral and Maxilofacial Surgery Cairo University Cairo Egypt
| | - Greg Goddard
- Center for Orofacial Pain University of California at San Francisco San Francisco CA USA
| | - Nikolaos Christidis
- Division of Oral Diagnostics and Rehabilitation Department of Dental Medicine Karolinska Institutet Huddinge Sweden
- Scandinavian Center for Orofacial Neuroscience Huddinge Sweden
| |
Collapse
|
26
|
Hurst P, Schipof-Godart L, Hettinga F, Roelands B, Beedie C. Improved 1000-m Running Performance and Pacing Strategy With Caffeine and Placebo: A Balanced Placebo Design Study. Int J Sports Physiol Perform 2020; 15:483-488. [PMID: 31575826 DOI: 10.1123/ijspp.2019-0230] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2019] [Revised: 06/18/2019] [Accepted: 07/08/2019] [Indexed: 11/18/2022]
Abstract
PURPOSE To investigate the placebo effect of caffeine on pacing strategy and performance over 1000-m running time trials using a balanced placebo design. METHODS Eleven well-trained male middle-distance athletes performed seven 1000-m time trials (1 familiarization, 2 baseline, and 4 experimental). Experimental trials consisted of the administration of 4 randomized treatments: informed caffeine/received caffeine, informed caffeine/received placebo, informed placebo/received caffeine, and informed placebo/received placebo. Split times were recorded at 200, 400, 600, 800, and 1000 m, and peak heart rate and rating of perceived exertion were recorded at the completion of the trial. RESULTS Relative to baseline, participants ran faster during informed caffeine/received caffeine (d = 0.42) and informed caffeine/received placebo (d = 0.43). These changes were associated with an increased pace during the first half of the trial. No differences were shown in pacing or performance between baseline and the informed placebo/received caffeine (d = 0.21) and informed placebo/received placebo (d = 0.10). No differences were reported between treatments for peak heart rate (η2 = .084) and rating of perceived exertion (η2 = .009). CONCLUSIONS The results indicate that the effect of believing to have ingested caffeine improved performance to the same magnitude as actually receiving caffeine. These improvements were associated with an increase in pace during the first half of the time trial.
Collapse
|
27
|
Abstract
This paper aims to critically evaluate and thoroughly discuss the evidence on the topic of caffeine supplementation when performing resistance exercise, as well as provide practical guidelines for the ingestion of caffeine prior to resistance exercise. Based on the current evidence, it seems that caffeine increases both maximal strength and muscular endurance. Furthermore, power appears to be enhanced with caffeine supplementation, although this effect might, to a certain extent, be caffeine dose- and external load-dependent. A reduction in rating of perceived exertion (RPE) might contribute to the performance-enhancing effects of caffeine supplementation as some studies have observed decreases in RPE coupled with increases in performance following caffeine ingestion. However, the same does not seem to be the case for pain perception as there is evidence showing acute increases in resistance exercise performance without any significant effects of caffeine ingestion on pain perception. Some studies have reported that caffeine ingestion did not affect exercise-induced muscle damage, but that it might reduce perceived resistance exercise-induced delayed-onset muscle soreness; however, this needs to be explored further. There is some evidence that caffeine ingestion, compared with a placebo, may lead to greater increases in the production of testosterone and cortisol following resistance exercise. However, given that the acute changes in hormone levels seem to be weakly correlated with hallmark adaptations to resistance exercise, such as hypertrophy and increased muscular strength, these findings are likely of questionable practical significance. Although not without contrasting findings, the available evidence suggests that caffeine ingestion can lead to acute increases in blood pressure (primarily systolic), and thus caution is needed regarding caffeine supplementation among individuals with high blood pressure. In the vast majority of studies, caffeine was administered in capsule or powder forms, and therefore the effects of alternative forms of caffeine, such as chewing gums or mouth rinses, on resistance exercise performance remain unclear. The emerging evidence suggests that coffee might be at least equally ergogenic as caffeine alone when the caffeine dose is matched. Doses in the range of 3-9 mg·kg-1 seem to be adequate for eliciting an ergogenic effect when administered 60 min pre-exercise. In general, caffeine seems to be safe when taken in the recommended doses. However, at doses as high as 9 mg·kg-1 or higher, side effects such as insomnia might be more pronounced. It remains unclear whether habituation reduces the ergogenic benefits of caffeine on resistance exercise as no evidence exists for this type of exercise. Caution is needed when extrapolating these conclusions to females as the vast majority of studies involved only male participants.
Collapse
|
28
|
Villa-Sánchez B, Emadi Andani M, Fiorio M. The role of the dorsolateral prefrontal cortex in the motor placebo effect. Eur J Neurosci 2019; 48:3410-3425. [PMID: 30362195 DOI: 10.1111/ejn.14217] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2018] [Accepted: 10/04/2018] [Indexed: 12/19/2022]
Abstract
The neural correlates of the placebo effect in the motor domain are still unknown. The aim of this study was to tackle the role of a frontal cortical region, the dorsolateral prefrontal cortex (dlPFC). To this end, we stimulated the cortical site corresponding to the left dlPFC with transcranial direct current stimulation (tDCS) during a placebo procedure and measured any change in the motor placebo effect in all the participants and more specifically in placebo-responders. Three different experiments were conducted in which healthy volunteers performed a force motor task with the index finger. The placebo treatment consisted of transcutaneous electrical nerve stimulation (TENS). In Experiment 1 (expectation alone), participants were only verbally suggested about the positive effects of TENS. In Experiment 2 (expectation and conditioning), participants were verbally suggested about TENS and conditioned with a surreptitious increase in a visual feedback of force. In Experiment 3 (control procedure), participants were told that TENS was inefficient. Each participant was tested in three different days with anodal, cathodal and sham tDCS over the dlPFC. Results showed that in Experiment 1 and 2 force increased after the procedure, independently of tDCS. By focusing on placebo-responders, we found that in Experiment 1 force remained stable after active tDCS, whereas it increased after inactive tDCS. These findings bring new evidence on the neural underpinnings of the motor placebo effect, by showing that independently of the polarity, active tDCS over the left dlPFC may undermine the expectation-induced enhancement of force in placebo-responders.
Collapse
Affiliation(s)
- Bernardo Villa-Sánchez
- Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Verona, Italy
| | - Mehran Emadi Andani
- Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Verona, Italy
| | - Mirta Fiorio
- Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Verona, Italy
| |
Collapse
|
29
|
Beedie C, Benedetti F, Barbiani D, Camerone E, Lindheimer J, Roelands B. Incorporating methods and findings from neuroscience to better understand placebo and nocebo effects in sport. Eur J Sport Sci 2019; 20:313-325. [PMID: 31573836 PMCID: PMC10181912 DOI: 10.1080/17461391.2019.1675765] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Placebo and nocebo effects are a factor in sports performance. However, the majority of published studies in sport science are descriptive and speculative regarding mechanisms. It is therefore not unreasonable for the sceptic to argue that placebo and nocebo effects in sport are illusory, and might be better explained by variations in phenomena such as motivation. It is likely that, in sport at least, placebo and nocebo effects will remain in this empirical grey area until researchers provide stronger mechanistic evidence. Recent research in neuroscience has identified a number of consistent, discrete and interacting neurobiological and physiological pathways associated with placebo and nocebo effects, with many studies reporting data of potential interest to sport scientists, for example relating to pain, fatigue and motor control. Findings suggest that placebos and nocebos result in activity of the opioid, endocannabinoid and dopamine neurotransmitter systems, brain regions including the motor cortex and striatum, and measureable effects on the autonomic nervous system. Many studies have demonstrated that placebo and nocebo effects associated with a treatment, for example an inert treatment presented as an analgesic or stimulant, exhibit mechanisms similar or identical to the verum or true treatment. Such findings suggest the possibility of a wide range of distinct placebo and nocebo mechanisms that might influence sports performance. In the present paper, we present some of the findings from neuroscience. Focussing on fatigue as an outcome and caffeine as vehicle, we propose three approaches that researchers in sport might incorporate in their studies in order to better elucidate mechanisms of placebo/nocebo effects on performance.
Collapse
Affiliation(s)
- Christopher Beedie
- School of Psychology, University of Kent, Canterbury, UK
- CHX Performance, London, UK
| | - Fabrizio Benedetti
- Medicine and Physiology of Hypoxia, Plateau Rosà, Italy/Switzerland
- Neuroscience Dept, University of Turin Medical School, Turin, Italy
| | - Diletta Barbiani
- Neuroscience Dept, University of Turin Medical School, Turin, Italy
| | | | - Jacob Lindheimer
- Department of Veterans Affairs, William S. Middleton Veterans Memorial Hospital, Madison, WI, USA
- Department of Kinesiology, University of Wisconsin–Madison, Madison, WI, USA
| | - Bart Roelands
- Department of Human Physiology, Vije Universiteit Brussels, Belgium
| |
Collapse
|
30
|
Are caffeine’s performance-enhancing effects partially driven by its bitter taste? Med Hypotheses 2019; 131:109301. [DOI: 10.1016/j.mehy.2019.109301] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Revised: 06/19/2019] [Accepted: 07/03/2019] [Indexed: 02/07/2023]
|
31
|
The Influence of Caffeine Expectancies on Simulated Soccer Performance in Recreational Individuals. Nutrients 2019; 11:nu11102289. [PMID: 31557945 PMCID: PMC6835791 DOI: 10.3390/nu11102289] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2019] [Revised: 09/06/2019] [Accepted: 09/23/2019] [Indexed: 12/20/2022] Open
Abstract
Caffeine (CAF) has been reported to improve various facets associated with successful soccer play, including gross motor skill performance, endurance capacity and cognition. These benefits are primarily attributed to pharmacological mechanisms. However, evidence assessing CAF's overall effects on soccer performance are sparse with no studies accounting for CAF's potential psychological impact. Therefore, the aim of this study was to assess CAF's psychological vs. pharmacological influence on various facets of simulated soccer performance. Utilising a double-dissociation design, eight male recreational soccer players (age: 22 ± 5 years, body mass: 78 ± 16 kg, height: 178 ± 6 cm) consumed CAF (3 mg/kg/body mass) or placebo (PLA) capsules, 60 minutes prior to performing the Loughborough Intermittent Shuttle Test (LIST) interspersed with a collection of ratings of perceived exertion (RPE), blood glucose and lactate, heart rate and performing the Loughborough Soccer Passing Test (LSPT). Whole-body dynamic reaction time (DRT) was assessed pre- and post- LIST, and endurance capacity (TLIM) post, time-matched LIST. Statistical analysis was performed using IBM SPSS (v24) whilst subjective perceptions were explored using template analysis. Mean TLIM was greatest (p < 0.001) for synergism (given CAF/told CAF) (672 ± 132 s) vs. placebo (given PLA/told PLA) (533 ± 79 s). However, when isolated, TLIM was greater (p = 0.012) for CAF psychology (given PLA/told CAF) (623 ± 117 s) vs. pharmacology (given CAF/told PLA) (578 ± 99 s), potentially, via reduced RPE. Although DRT performance was greater (p = 0.024) post-ingestion (+5 hits) and post-exercise (+7 hits) for pharmacology vs. placebo, psychology and synergism appeared to improve LSPT performance vs. pharmacology. Interestingly, positive perceptions during psychology inhibited LSPT and DRT performance via potential CAF over-reliance, with the opposite occurring following negative perceptions. The benefits associated with CAF expectancies may better suit tasks that entail lesser cognitive-/skill-specific attributes but greater gross motor function and this is likely due to reduced RPE. In isolation, these effects appear greater vs. CAF pharmacology. However, an additive benefit may be observed after combining expectancy with CAF pharmacology (i.e. synergism).
Collapse
|
32
|
Hurst P, Schipof-Godart L, Szabo A, Raglin J, Hettinga F, Roelands B, Lane A, Foad A, Coleman D, Beedie C. The Placebo and Nocebo effect on sports performance: A systematic review. Eur J Sport Sci 2019; 20:279-292. [DOI: 10.1080/17461391.2019.1655098] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Philip Hurst
- School of Human and Life Sciences, Canterbury Christ Church University, Canterbury, UK
| | - Lieke Schipof-Godart
- Faculty of Health, Nutrition & Sports, The Hague University of Applied Sciences, Hague, Netherlands
| | - Attila Szabo
- Institute of Health Promotion and Sports Sciences, Eötvös Loránd University, Budapest, Hungary
| | - John Raglin
- School of Public Health, Indiana University, Bloomington, IN, USA
| | - Florentina Hettinga
- Department of Sport, Exercise and Rehabilitation, Northumbria University, Newcastle upon Tyne, UK
| | - Bart Roelands
- Department of Human Physiology, Vrije Universiteit Brussel, Brussels, Belgium
| | - Andrew Lane
- Faculty of Education Health and Wellbeing, Institute of Sport, University of Wolverhampton, Walsall, UK
| | - Abby Foad
- School of Human and Life Sciences, Canterbury Christ Church University, Canterbury, UK
| | - Damian Coleman
- School of Human and Life Sciences, Canterbury Christ Church University, Canterbury, UK
| | - Chris Beedie
- School of Psychology, University of Kent, Canterbury, UK
| |
Collapse
|
33
|
Holt RIG, Ho KKY. The Use and Abuse of Growth Hormone in Sports. Endocr Rev 2019; 40:1163-1185. [PMID: 31180479 DOI: 10.1210/er.2018-00265] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/08/2018] [Accepted: 02/27/2019] [Indexed: 12/18/2022]
Abstract
GH is banned by the World Anti-Doping Agency as a performance-enhancing anabolic agent. Doping with GH likely began in the early 1980s and became more prevalent with the advent of recombinant technology well before any scientific evidence of benefit. The expectation that GH improves physical function stems from its anabolic and lipolytic properties. Athletic performance depends on muscle strength and the energy required to power muscle function. In recreational athletes, GH selectively improves anaerobic sprint capacity but has not been proven to significantly enhance muscle strength, power, or maximum rate of oxygen consumption. GH is secreted as a family of isoform peptides in a pulsatile manner reflecting intermittent secretion and rapid clearance. Its anabolic actions are largely mediated by IGF-I, which stimulates whole-body protein synthesis, including skeletal muscle and collagen proteins. Two methods have been validated for detecting GH abuse in athletes. The first (the isoform method) is based on distinguishing pure recombinant 22-kDa GH from the heterogeneous isoforms secreted from the pituitary. The second (the marker method) is based on measuring blood levels of GH-responsive proteins, specifically IGF-I and the N-terminal propeptide of type III collagen (P-III-NP). Only a handful of athletes have been caught since the implementation of GH doping tests in 2004. The low rate likely reflects the limitation of in-competition testing using current methods. Improved detection rates may be achieved by more out-of-competition testing, introducing athletes' biological passports, and the development of novel methods. Governance, operational, technical, and political factors influence the effectiveness of an anti-doping program.
Collapse
Affiliation(s)
- Richard I G Holt
- Human Development and Health, Faculty of Medicine, University of Southampton, Southampton, United Kingdom
| | - Ken K Y Ho
- Garvan Institute of Medical Research, St. Vincent's Hospital, University of New South Wales, Sydney, New South Wales, Australia
| |
Collapse
|
34
|
Davis AJ, Hettinga F, Beedie C. You don't need to administer a placebo to elicit a placebo effect: Social factors trigger neurobiological pathways to enhance sports performance. Eur J Sport Sci 2019; 20:302-312. [DOI: 10.1080/17461391.2019.1635212] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Arran J. Davis
- Institute of Cognitive & Evolutionary Anthropology, University of Oxford, UK
| | - Florentina Hettinga
- Department of Sport, Rehabilitation, and Exercise, Northumbria University, England, UK
| | - Chris Beedie
- School of Psychology, University of Kent, Canterbury, UK
- CHX Performance, London, UK
| |
Collapse
|
35
|
Wolters F, Peerdeman KJ, Evers AW. Placebo and Nocebo Effects Across Symptoms: From Pain to Fatigue, Dyspnea, Nausea, and Itch. Front Psychiatry 2019; 10:470. [PMID: 31312148 PMCID: PMC6614509 DOI: 10.3389/fpsyt.2019.00470] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/11/2019] [Accepted: 06/13/2019] [Indexed: 01/06/2023] Open
Abstract
Placebo and nocebo effects are, respectively, the helpful and harmful treatment effects that do not arise from active treatment components. These effects have thus far been researched most often in pain. It is not yet clear to what extent these findings from pain can be generalized to other somatic symptoms. This review investigates placebo and nocebo effects in four other highly prevalent symptoms: dyspnea, fatigue, nausea, and itch. The role of learning mechanisms (verbal suggestions, conditioning) in placebo and nocebo effects on various outcomes (self-reported, behavioral, and physiological) of these different somatic symptoms is explored. A search of experimental studies indicated that, as in pain, the combination of verbal suggestion and conditioning is generally more effective than suggestion alone for evoking placebo and nocebo effects. However, conditioning appears more and verbal suggestions less relevant in symptoms other than pain, with the exception of placebo effects on fatigue and nocebo effects on itch. Physiological measures, such as heart rate, lung function, or gastric activity, are rarely affected even when self-reported symptoms are. Neurobiological correlates are rarely investigated, and few commonalities appear across symptoms. Expectations generally predict placebo and nocebo effects for dyspnea and itch but seem less involved in fatigue and nausea. Individual characteristics do not consistently predict placebo or nocebo effects across symptoms or studies. In sum, many conclusions deriving from placebo and nocebo pain studies do appear to apply to other somatic symptoms, but a number of important differences exist. Understanding what type of learning mechanisms for which symptom are most likely to trigger placebo and nocebo effects is crucial for generalizing knowledge for research and therapies across symptoms and can help clinicians to optimize placebo effects in practice.
Collapse
Affiliation(s)
- Fabian Wolters
- Health, Medical and Neuropsychology Unit, Institute of Psychology, Faculty of Social and Behavioral Sciences, Leiden University, Leiden, Netherlands
- Leiden Institute for Brain and Cognition, Leiden University, Leiden, Netherlands
| | - Kaya J. Peerdeman
- Health, Medical and Neuropsychology Unit, Institute of Psychology, Faculty of Social and Behavioral Sciences, Leiden University, Leiden, Netherlands
- Leiden Institute for Brain and Cognition, Leiden University, Leiden, Netherlands
| | - Andrea W.M. Evers
- Health, Medical and Neuropsychology Unit, Institute of Psychology, Faculty of Social and Behavioral Sciences, Leiden University, Leiden, Netherlands
- Leiden Institute for Brain and Cognition, Leiden University, Leiden, Netherlands
- Department of Psychiatry, Leiden University Medical Center, Leiden, Netherlands
| |
Collapse
|
36
|
Soares EDMKVK, Garcia GL, Molina GE, Fontana KE. MUSCLE STRENGTH AND CAFFEINE SUPPLEMENTATION: ARE WE DOING MORE OF THE SAME? REV BRAS MED ESPORTE 2019. [DOI: 10.1590/1517-869220192502180594] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
ABSTRACT The purpose of this review was to examine in the current literature the advances made in terms of the effects of caffeine supplementation on maximum strength and its associated mechanisms since the publication of two important papers in 2010. Searches were carried out in the PubMed, Medline, Scielo and Web of Science databases for articles published after 2010. Sixteen studies were included based on inclusion and exclusion criteria. Five studies did not report changes in maximal voluntary strength (31.3%). Four of them used isometric muscle contractions, although this may not be a key factor because five other studies also used isometric contractions and reported ergogenic effects. Furthermore, these four studies evaluated small muscle groups and volunteers were not accustomed to consuming caffeine. Caffeine produced ergogenic effects in eleven of the sixteen studies analyzed (68.8%). None of the doses were clearly related to ergogenic effects; however, a dose of at least 3 mg/kg of caffeine is probably necessary. Caffeine ergogenicity was affected by various factors. There was a lack of standardized protocols and controls for intervening factors (e.g., circadian cycles and nutritional states), which could affect results. An ideal caffeine supplementation protocol that is useful for future research, athletes, and physical activity practitioners, has yet to be defined. A small advance made since 2010 involved a possible lack of gender difference; it would appear that caffeine supplementation affects men and women equally. Level of Evidence I; Systematic Review of Level I Studies.
Collapse
|
37
|
The neurobiology of placebo effects in sports: EEG frontal alpha asymmetry increases in response to a placebo ergogenic aid. Sci Rep 2019; 9:2381. [PMID: 30787332 PMCID: PMC6382860 DOI: 10.1038/s41598-019-38828-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2018] [Accepted: 01/10/2019] [Indexed: 12/30/2022] Open
Abstract
The performance enhancing (ergogenic) placebo effect is elicited by an inert treatment and caused by positive affective appraisal of effort perception. Frontal alpha asymmetry (FAA) is a neurobiological correlate of positive affect. This study investigates, whether receiving an ergogenic placebo increases FAA and whether scores on the behavioral inhibition and activation system (BIS/BAS) scales affect this increase in FAA. Nineteen competitive male cyclists (37.26 ± 9.82 years) performed two maximum effort time trials. The first served as baseline for the second intervention time trial, where athletes received a placebo ergogenic aid or no treatment. We recorded FAA using EEG throughout all time trials and assessed BIS/BAS by questionnaire. There was a significant difference in change from baseline to intervention time trial in FAA during cycling in response to the placebo ergogenic aid compared to the control group. BIS, the BAS subscale Drive and the BAS-BIS difference score significantly co-varied with the change in FAA from baseline to intervention time trial in response to the placebo ergogenic aid. Administering a placebo ergogenic aid significantly influenced FAA during maximum effort cycling. Those athletes with a more pronounced goal seeking persistence and an overall dominance of the BAS over the BIS showed a significantly greater increase in FAA in response to a placebo ergogenic aid. A more pronounced BIS, however, seems to antagonize the increase in FAA associated with the ergogenic placebo response.
Collapse
|
38
|
Shabir A, Hooton A, Tallis J, F Higgins M. The Influence of Caffeine Expectancies on Sport, Exercise, and Cognitive Performance. Nutrients 2018; 10:E1528. [PMID: 30336606 PMCID: PMC6212857 DOI: 10.3390/nu10101528] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2018] [Revised: 10/13/2018] [Accepted: 10/15/2018] [Indexed: 11/29/2022] Open
Abstract
Caffeine (CAF) is widely consumed across sport and exercise for its reputed ergogenic properties, including central nervous stimulation and enhanced muscular force development. However, expectancy and the related psychological permutations that are associated with oral CAF ingestion are generally not considered in most experimental designs and these could be important in understanding if/how CAF elicits an ergogenic effect. The present paper reviews 17 intervention studies across sport, exercise, and cognitive performance. All explore CAF expectancies, in conjunction with/without CAF pharmacology. Thirteen out of 17 studies indicated expectancy effects of varying magnitudes across a range of exercise tasks and cognitive skills inclusive off but not limited to; endurance capacity, weightlifting performance, simple reaction time and memory. Factors, such as motivation, belief, and habitual CAF consumption habits influenced the response. In many instances, these effects were comparable to CAF pharmacology. Given these findings and the lack of consistency in the experimental design, future research acknowledging factors, such as habitual CAF consumption habits, habituated expectations, and the importance of subjective post-hoc analysis will help to advance knowledge within this area.
Collapse
Affiliation(s)
- Akbar Shabir
- Sport, Outdoor and Exercise Science, Kedleston Campus, University of Derby, Kedleston Road, Derby DE22 1GB, UK.
| | - Andy Hooton
- Sport, Outdoor and Exercise Science, Kedleston Campus, University of Derby, Kedleston Road, Derby DE22 1GB, UK.
| | - Jason Tallis
- Centre for Applied Biological and Exercise Sciences, Coventry University, Priory Street, Coventry CV1 5FB, UK.
| | - Matthew F Higgins
- Sport, Outdoor and Exercise Science, Kedleston Campus, University of Derby, Kedleston Road, Derby DE22 1GB, UK.
| |
Collapse
|
39
|
The interplay of exercise, placebo and nocebo effects on experimental pain. Sci Rep 2018; 8:14758. [PMID: 30283022 PMCID: PMC6170492 DOI: 10.1038/s41598-018-32974-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2018] [Accepted: 09/13/2018] [Indexed: 11/08/2022] Open
Abstract
Over the last few decades, placebo, and nocebo effects in general, have been investigated at rest. This proposed study explores whether they could work even when the experience of pain occurs during a movement. Exercise itself can have a hypoalgesic effect, suggesting that placebo- and exercise-induced hypoalgesia could foster pain reduction. In the present study, we investigated the interplay of exercise, placebo and nocebo effects on pain. To this aim, we developed a machine-controlled isotonic motor task to standardize the exercise across participants and used a well-validated model of placebo and nocebo manipulations with reinforced expectations via a conditioning procedure including visual cues paired with heat painful stimulations. Participants reported expectations and pain on a trial-by-trial basis. We found that the standardized isotonic exercise elicited a reduction of pain intensity. Moreover, both exercise and placebo induced comparable hypoalgesic effects. When the exercise was added, placebo and nocebo effects were influenced by expectations but were not affected by fatigue or sex differences. Exercise-, placebo- and nocebo-induced pain modulation are likely to work through distinct mechanisms and neurophysiological research is needed to fully exploit the implications for sport, rehabilitation and pain management.
Collapse
|
40
|
Pires FO, Dos Anjos CAS, Covolan RJM, Fontes EB, Noakes TD, St Clair Gibson A, Magalhães FH, Ugrinowitsch C. Caffeine and Placebo Improved Maximal Exercise Performance Despite Unchanged Motor Cortex Activation and Greater Prefrontal Cortex Deoxygenation. Front Physiol 2018; 9:1144. [PMID: 30246799 PMCID: PMC6113857 DOI: 10.3389/fphys.2018.01144] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2017] [Accepted: 07/30/2018] [Indexed: 11/13/2022] Open
Abstract
Caffeine (CAF) is an ergogenic aid used to improve exercise performance. Independent studies have suggested that caffeine may have the ability to increase corticospinal excitability, thereby decreasing the motor cortex activation required to generate a similar motor output. However, CAF has also been suggested to induce a prefrontal cortex (PFC) deoxygenation. Others have suggested that placebo (PLA) may trigger comparable effects to CAF, as independent studies found PLA effects on motor performance, corticospinal excitability, and PFC oxygenation. Thus, we investigated if CAF and CAF-perceived PLA may improve motor performance, despite the likely unchanged MC activation and greater PFC deoxygenation. Nine participants (26.4 ± 4.8 years old, VO2MAX of 42.2 ± 4.6 mL kg-1 min-1) performed three maximal incremental tests (MITs) in control (no supplementation) and ∼60 min after CAF and PLA ingestion. PFC oxygenation (near-infrared spectroscopy at Fp1 position), MC activation (EEG at Cz position) and vastus lateralis and rectus femoris muscle activity (EMG) were measured throughout the tests. Compared to control, CAF and PLA increased rectus femoris muscle EMG (P = 0.030; F = 2.88; d = 0.84) at 100% of the MIT, and enhanced the peak power output (P = 0.006; F = 12.97; d = 1.8) and time to exhaustion (P = 0.007; F = 12.97; d = 1.8). In contrast, CAF and PLA did not change MC activation, but increased the PFC deoxygenation as indicated by the lower O2Hb (P = 0.001; F = 4.68; d = 1.08) and THb concentrations (P = 0.01; F = 1.96; d = 0.7) at 80 and 100% the MIT duration. These results showed that CAF and CAF-perceived PLA had the ability to improve motor performance, despite unchanged MC activation and greater PFC deoxygenation. The effectiveness of CAF as ergogenic aid to improve MIT performance was challenged.
Collapse
Affiliation(s)
- Flavio O Pires
- Exercise Psychophysiology Research Group, School of Arts, Sciences and Humanities, University of São Paulo, São Paulo, Brazil
| | - Carlos A S Dos Anjos
- Neurophysics Group, Gleb Wataghin Physics Institute, University of Campinas, Campinas, Brazil
| | - Roberto J M Covolan
- Neurophysics Group, Gleb Wataghin Physics Institute, University of Campinas, Campinas, Brazil
| | - Eduardo B Fontes
- Research Group in Physical Activity, Cognition and Behavior, Federal University of Rio Grande do Norte, Natal, Brazil
| | - Timothy D Noakes
- Sports Science Institute of South Africa, Department of Human Biology, University of Cape Town, Cape Town, South Africa
| | | | - Fernando H Magalhães
- Exercise Psychophysiology Research Group, School of Arts, Sciences and Humanities, University of São Paulo, São Paulo, Brazil
| | - Carlos Ugrinowitsch
- School of Physical Education and Sport, University of São Paulo, São Paulo, Brazil
| |
Collapse
|
41
|
Beedie C, Benedetti F, Barbiani D, Camerone E, Cohen E, Coleman D, Davis A, Elsworth-Edelsten C, Flowers E, Foad A, Harvey S, Hettinga F, Hurst P, Lane A, Lindheimer J, Raglin J, Roelands B, Schiphof-Godart L, Szabo A. Consensus statement on placebo effects in sports and exercise: The need for conceptual clarity, methodological rigour, and the elucidation of neurobiological mechanisms. Eur J Sport Sci 2018; 18:1383-1389. [PMID: 30114971 DOI: 10.1080/17461391.2018.1496144] [Citation(s) in RCA: 52] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
In June 2017 a group of experts in anthropology, biology, kinesiology, neuroscience, physiology, and psychology convened in Canterbury, UK, to address questions relating to the placebo effect in sport and exercise. The event was supported exclusively by Quality Related (QR) funding from the Higher Education Funding Council for England (HEFCE). The funder did not influence the content or conclusions of the group. No competing interests were declared by any delegate. During the meeting and in follow-up correspondence, all delegates agreed the need to communicate the outcomes of the meeting via a brief consensus statement. The two specific aims of this statement are to encourage researchers in sport and exercise science to 1. Where possible, adopt research methods that more effectively elucidate the role of the brain in mediating the effects of treatments and interventions. 2. Where possible, adopt methods that factor for and/or quantify placebo effects that could explain a percentage of inter-individual variability in response to treatments and intervention.
Collapse
Affiliation(s)
- Christopher Beedie
- a Human & Life Sciences , Canterbury Christ Church University , Canterbury , UK
| | | | - Diletta Barbiani
- b Department of Neuroscience , University of Turin , Turin , Italy
| | | | - Emma Cohen
- d Institute of Cognitive & Evolutionary Anthropology , University of Oxford , Oxford , UK
| | - Damian Coleman
- a Human & Life Sciences , Canterbury Christ Church University , Canterbury , UK
| | - Arran Davis
- d Institute of Cognitive & Evolutionary Anthropology , University of Oxford , Oxford , UK
| | | | - Elliott Flowers
- e School of Sport, Rehabilitation and Exercise Science , University of Essex , Colchester , UK
| | - Abby Foad
- a Human & Life Sciences , Canterbury Christ Church University , Canterbury , UK
| | - Simon Harvey
- a Human & Life Sciences , Canterbury Christ Church University , Canterbury , UK
| | - Florentina Hettinga
- e School of Sport, Rehabilitation and Exercise Science , University of Essex , Colchester , UK
| | - Philip Hurst
- f School of Sport, Exercise and Rehabilitation Sciences , University of Birmingham , Birmingham , UK
| | - Andrew Lane
- g Faculty of Education Health and Wellbeing , University of Wolverhampton , Wolverhampton , UK
| | - Jacob Lindheimer
- h War Related Illness and Injury Study Center , US Department of Veterans Affairs , East Orange , NJ , USA
| | - John Raglin
- i School of Public Health , Indiana University , Bloomington , IN , USA
| | - Bart Roelands
- j Department of Human Physiology , Vrije Universiteit Brussel , Brussels , Belgium
| | - Lieke Schiphof-Godart
- k Faculty of Health, Nutrition & Sports , The Hague University of Applied Sciences , Hague , The Netherlands
| | - Attila Szabo
- l Institute of Health Promotion and Sport Sciences , ELTE Eötvös Loránd University , Budapest , Hungary
| |
Collapse
|
42
|
The placebo effect in the motor domain is differently modulated by the external and internal focus of attention. Sci Rep 2018; 8:12296. [PMID: 30115945 PMCID: PMC6095847 DOI: 10.1038/s41598-018-30228-9] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2018] [Accepted: 07/20/2018] [Indexed: 12/14/2022] Open
Abstract
Among the cognitive strategies that can facilitate motor performance in sport and physical practice, a prominent role is played by the direction of the focus of attention and the placebo effect. Consistent evidence converges in indicating that these two cognitive functions can influence the motor outcome, although no study up-to-now tried to study them together in the motor domain. In this explorative study, we combine for the first time these approaches, by applying a placebo procedure to increase force and by manipulating the focus of attention with explicit verbal instructions. Sixty healthy volunteers were asked to perform abduction movements with the index finger as strongly as possible against a piston and attention could be directed either toward the movements of the finger (internal focus, IF) or toward the movements of the piston (external focus, EF). Participants were randomized in 4 groups: two groups underwent a placebo procedure (Placebo-IF and Placebo-EF), in which an inert treatment was applied on the finger with verbal information on its positive effects on force; two groups underwent a control procedure (Control-IF and Control-EF), in which the same treatment was applied with overt information about its inefficacy. The placebo groups were conditioned about the effects of the treatment with a surreptitious amplification of a visual feedback signalling the level of force. During the whole procedure, we recorded actual force, subjective variables and electromyography from the hand muscles. The Placebo-IF group had higher force levels after the procedure than before, whereas the Placebo-EF group had a decrease of force. Electromyography showed that the Placebo-IF group increased the muscle units recruitment without changing the firing rate. These findings show for the first time that the placebo effect in motor performance can be influenced by the subject’s attentional focus, being enhanced with the internal focus of attention.
Collapse
|
43
|
Fiorio M. Modulation of the Motor System by Placebo and Nocebo Effects. INTERNATIONAL REVIEW OF NEUROBIOLOGY 2018; 139:297-319. [PMID: 30146052 DOI: 10.1016/bs.irn.2018.07.012] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
There is strong behavioral evidence that placebo and nocebo effects can influence aspects of motor performance like speed, force, and resistance to fatigue in athletes and non-athletes alike. These behavioral studies were essential for extending experimental investigation of the placebo and nocebo effects from the pain to the motor domain and to reveal how verbal suggestions and experiential learning are involved in shaping modulatory systems and related behavioral responses. However, the neural underpinnings of these effects in the motor domain are still largely unknown. Studies in healthy subjects demonstrated that the placebo-induced enhancement of force is associated with increased activity in the corticospinal system and that the placebo-induced reduction of fatigue can be disclosed by recording the readiness potential, an electrophysiological sign of movement preparation. Further evidence derives from studies in patients with Parkinson's disease that have directly demonstrated that placebo-induced improvements in motor symptoms are related to changes in subcortical neural firing activity and dopamine release. Future investigations are needed to better clarify the complex neural architecture underpinning the placebo and nocebo effects in the motor domain.
Collapse
Affiliation(s)
- Mirta Fiorio
- Department of Neuroscience, Biomedicine and Movement Sciences, University of Verona, Verona, Italy.
| |
Collapse
|
44
|
Broelz EK, Wolf S, Schneeweiss P, Niess AM, Enck P, Weimer K. Increasing effort without noticing: A randomized controlled pilot study about the ergogenic placebo effect in endurance athletes and the role of supplement salience. PLoS One 2018; 13:e0198388. [PMID: 29889868 PMCID: PMC5995445 DOI: 10.1371/journal.pone.0198388] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2017] [Accepted: 05/11/2018] [Indexed: 12/12/2022] Open
Abstract
Purpose Previous research shows that endurance performance can be enhanced by placebo ergogenic aids. This study investigates the ergogenic placebo response, which we define as an increase in objective and physiological effort without an increase in subjective effort, in competitive cyclists. The primary objective of this study is to explore the role of supplement salience in the ergogenic placebo response, while the secondary aim is to assess whether believing to have taken an inactive placebo supplement attenuates the desired ergogenic effect. Methods We employed a double-blind placebo-controlled study design and compared a high salience (pudding) to a low salience (capsules) ergogenic placebo supplement and to a no treatment control group. Thirty-four male athletes (30.0 ± 5.7 years) performed two self-regulated time trials on an isokinetic cycling ergometer, one without intervention serving as a baseline and one with intervention according to group assignment. At both time trials, power output (objective effort), blood lactate (physiological effort) and the rating of perceived exertion (subjective effort) were measured. Results Receiving a high salience supplement can increase physiological and objective effort without a proportional rise in subjective effort, suggesting a decoupling of perceived exertion and endurance performance. Low salience and control group both showed no such ergogenic placebo response. Athletes’ belief concerning the true nature of the ergogenic aid (inactive placebo vs. ergogenic supplement) did not influence the ergogenic placebo response. Conclusion High salience placebo ergogenic aids can elicit enhanced performance without the athlete noticing (exertion), and deception of athletes seems unnecessary as even believing to have received an inactive placebo supplement maintains the ergogenic placebo response.
Collapse
Affiliation(s)
- Ellen K. Broelz
- Department of Psychosomatic Medicine and Psychotherapy, University Hospital Tübingen, Tübingen, Germany
| | - Sebastian Wolf
- Department of Psychology, University of Tübingen, Tübingen, Germany
| | - Patrick Schneeweiss
- Department of Sports Medicine, University Hospital Tübingen, Tübingen, Germany
| | - Andreas M. Niess
- Department of Sports Medicine, University Hospital Tübingen, Tübingen, Germany
| | - Paul Enck
- Department of Psychosomatic Medicine and Psychotherapy, University Hospital Tübingen, Tübingen, Germany
| | - Katja Weimer
- Department of Psychosomatic Medicine and Psychotherapy, University Hospital Tübingen, Tübingen, Germany
- Clinic for Psychosomatic Medicine and Psychotherapy, University Hospital Ulm, Ulm, Germany
- * E-mail:
| |
Collapse
|
45
|
Grgic J, Trexler ET, Lazinica B, Pedisic Z. Effects of caffeine intake on muscle strength and power: a systematic review and meta-analysis. J Int Soc Sports Nutr 2018. [PMID: 29527137 PMCID: PMC5839013 DOI: 10.1186/s12970-018-0216-0] [Citation(s) in RCA: 180] [Impact Index Per Article: 30.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Background Caffeine is commonly used as an ergogenic aid. Literature about the effects of caffeine ingestion on muscle strength and power is equivocal. The aim of this systematic review and meta-analysis was to summarize results from individual studies on the effects of caffeine intake on muscle strength and power. Methods A search through eight databases was performed to find studies on the effects of caffeine on: (i) maximal muscle strength measured using 1 repetition maximum tests; and (ii) muscle power assessed by tests of vertical jump. Meta-analyses of standardized mean differences (SMD) between placebo and caffeine trials from individual studies were conducted using the random effects model. Results Ten studies on the strength outcome and ten studies on the power outcome met the inclusion criteria for the meta-analyses. Caffeine ingestion improved both strength (SMD = 0.20; 95% confidence interval [CI]: 0.03, 0.36; p = 0.023) and power (SMD = 0.17; 95% CI: 0.00, 0.34; p = 0.047). A subgroup analysis indicated that caffeine significantly improves upper (SMD = 0.21; 95% CI: 0.02, 0.39; p = 0.026) but not lower body strength (SMD = 0.15; 95% CI: -0.05, 0.34; p = 0.147). Conclusion The meta-analyses showed significant ergogenic effects of caffeine ingestion on maximal muscle strength of upper body and muscle power. Future studies should more rigorously control the effectiveness of blinding. Due to the paucity of evidence, additional findings are needed in the female population and using different forms of caffeine, such as gum and gel.
Collapse
Affiliation(s)
- Jozo Grgic
- 1Institute of Sport, Exercise and Active Living (ISEAL), Victoria University, Melbourne, Australia
| | - Eric T Trexler
- 2Applied Physiology Laboratory, Department of Exercise and Sport Science, University of North Carolina, Chapel Hill, NC USA.,3Human Movement Science Curriculum, Department of Allied Health Sciences, University of North Carolina, Chapel Hill, NC USA
| | - Bruno Lazinica
- Faculty of Education, Department of Kinesiology, J.J. Strossmayer University, Osijek, Croatia
| | - Zeljko Pedisic
- 1Institute of Sport, Exercise and Active Living (ISEAL), Victoria University, Melbourne, Australia
| |
Collapse
|
46
|
The Effects of Social Support on Strenuous Physical Exercise. ADAPTIVE HUMAN BEHAVIOR AND PHYSIOLOGY 2018; 4:171-187. [PMID: 29755928 PMCID: PMC5935032 DOI: 10.1007/s40750-017-0086-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2017] [Revised: 12/11/2017] [Accepted: 12/12/2017] [Indexed: 02/02/2023]
Abstract
In humans, socio-environmental cues play an important role in determining adaptive psychophysiological states and behaviours. In sport and exercise, cues to cohesive groups and close, supportive relationships are ubiquitous, possibly because of their effects on neurobiological mechanisms underlying physical performance. Clinical research has shown that the presence of supportive others can lead to reductions in perceptions of pain, while research from sport and exercise science has shown that pain and physical fatigue occupy ranges on a single spectrum of physical discomfort, which works to regulate outputs during strenuous physical exertion. Given the similar neurobiological underpinnings of pain and fatigue, the involvement of both in the self-regulation of strenuous physical outputs, and the effects of social support on perceptions of pain and neurophysiological stress responses more generally, we hypothesised that perceptions of social support affect outputs during strenuous physical exercise by altering activity in self-regulatory mechanisms involved in perceptions of pain and fatigue. We used a between-subjects experimental design to test this hypothesis, varying participants' social support and measuring physical outputs and perceptions of physical discomfort and exertion during a series of maximum-effort cycling bouts. Analyses showed that participants in the social support condition produced greater initial outputs and steeper declines over time, compared to controls. This effect was moderated by participant neuroticism; an important predictor of how individuals react to social support. We discuss these findings in terms of proposed causal mechanisms linking supportive, cohesive social environments with self-regulation and physical performance.
Collapse
|
47
|
Shoffel-Havakuk H, Lava CX, Hapner ER, O'Dell K, Reder L, Johns MM. The Singer's and the Clinician's Perspective on Vitamin B 12 Treatment for Vocal Benefits. J Voice 2018; 33:352-356. [PMID: 29306524 DOI: 10.1016/j.jvoice.2017.10.021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2017] [Accepted: 10/26/2017] [Indexed: 11/29/2022]
Abstract
INTRODUCTION There is a belief among vocalists that there are voice benefits from vitamin B12 treatment. Yet there are no previous reports regarding vitamin B12 effects on voice. OBJECTIVES To assess the prevalence of vitamin B12 use among singers and their beliefs regarding vitamin B12 therapy. METHODS Anonymous online survey administered to singers, singing-teachers, speech-language pathologists, and laryngologists. RESULTS A total of 192 participants completed the surveys; 128 singers (68 singing-teachers, 30 speech-language pathologists) and 64 laryngologists. Among singers, 12% have perceived voice benefits from vitamin B12 treatment taken for any reason. Four percent used vitamin B12 for voice benefits; all perceived voice benefits as a result. The leading voice benefits were improved stamina, reduced effort, confidence, and control. Nineteen percent of the singers would recommend vitamin B12 treatment to a friend; 15% of the singing-teachers would recommend it to a student. Among laryngologists, 33% been asked by a singer to prescribe vitamin B12 for voice benefits; 9% have prescribed it in the past. Yet only 3% would you recommend it to a patient. When asked "Do you believe vitamin B12 therapy improves vocal performance?" 31% of the singers responded "Yes," compared with none in the laryngologists. When asked "Do you think the singing community believes vitamin B12 therapy improves vocal performance?" 26% of the singers responded "Yes," compared with 53% of the laryngologists (P = 0.0002). CONCLUSIONS There is a discrepancy between the singers' and the laryngologists' beliefs regarding vocal benefits perceived by vitamin B12. Blinded randomized trials are required to verify or refute this belief.
Collapse
Affiliation(s)
- Hagit Shoffel-Havakuk
- USC Voice Center, Department of Otolaryngology-Head and Neck Surgery, University of Southern California, Los Angeles, California
| | | | - Edie R Hapner
- USC Voice Center, Department of Otolaryngology-Head and Neck Surgery, University of Southern California, Los Angeles, California
| | - Karla O'Dell
- USC Voice Center, Department of Otolaryngology-Head and Neck Surgery, University of Southern California, Los Angeles, California
| | - Lindsay Reder
- USC Voice Center, Department of Otolaryngology-Head and Neck Surgery, University of Southern California, Los Angeles, California
| | - Michael M Johns
- USC Voice Center, Department of Otolaryngology-Head and Neck Surgery, University of Southern California, Los Angeles, California.
| |
Collapse
|
48
|
Lenaert B, Boddez Y, Vlaeyen JW, van Heugten CM. Learning to feel tired: A learning trajectory towards chronic fatigue. Behav Res Ther 2018; 100:54-66. [DOI: 10.1016/j.brat.2017.11.004] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2017] [Revised: 11/16/2017] [Accepted: 11/20/2017] [Indexed: 12/11/2022]
|
49
|
Pickering C, Kiely J. Are the Current Guidelines on Caffeine Use in Sport Optimal for Everyone? Inter-individual Variation in Caffeine Ergogenicity, and a Move Towards Personalised Sports Nutrition. Sports Med 2018; 48:7-16. [PMID: 28853006 PMCID: PMC5752738 DOI: 10.1007/s40279-017-0776-1] [Citation(s) in RCA: 126] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Caffeine use is widespread in sport, with a strong evidence base demonstrating its ergogenic effect. Based on existing research, current guidelines recommend ingestion of 3-9 mg/kg approximately 60 min prior to exercise. However, the magnitude of performance enhancement following caffeine ingestion differs substantially between individuals, with the spectrum of responses ranging between highly ergogenic to ergolytic. These extensive inter-individual response distinctions are mediated by variation in individual genotype, environmental factors, and the legacy of prior experiences partially mediated via epigenetic mechanisms. Here, we briefly review the drivers of this inter-individual variation in caffeine response, focusing on the impact of common polymorphisms within two genes, CYP1A2 and ADORA2A. Contemporary evidence suggests current standardised guidelines are optimal for only a sub-set of the athlete population. Clearer understanding of the factors underpinning inter-individual variation potentially facilitates a more nuanced, and individually and context-specific customisation of caffeine ingestion guidelines, specific to an individual's biology, history, and competitive situation. Finally, we identify current knowledge deficits in this area, along with future associated research questions.
Collapse
Affiliation(s)
- Craig Pickering
- Institute of Coaching and Performance, School of Sport and Wellbeing, University of Central Lancashire, Preston, PR1 2HE, UK.
- Exercise and Nutritional Genomics Research Centre, DNAFit Ltd, London, UK.
| | - John Kiely
- Institute of Coaching and Performance, School of Sport and Wellbeing, University of Central Lancashire, Preston, PR1 2HE, UK
| |
Collapse
|
50
|
Rozenkrantz L, Mayo AE, Ilan T, Hart Y, Noy L, Alon U. Placebo can enhance creativity. PLoS One 2017; 12:e0182466. [PMID: 28892513 PMCID: PMC5593173 DOI: 10.1371/journal.pone.0182466] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2017] [Accepted: 07/19/2017] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND The placebo effect is usually studied in clinical settings for decreasing negative symptoms such as pain, depression and anxiety. There is interest in exploring the placebo effect also outside the clinic, for enhancing positive aspects of performance or cognition. Several studies indicate that placebo can enhance cognitive abilities including memory, implicit learning and general knowledge. Here, we ask whether placebo can enhance creativity, an important aspect of human cognition. METHODS Subjects were randomly assigned to a control group who smelled and rated an odorant (n = 45), and a placebo group who were treated identically but were also told that the odorant increases creativity and reduces inhibitions (n = 45). Subjects completed a recently developed automated test for creativity, the creative foraging game (CFG), and a randomly chosen subset (n = 57) also completed two manual standardized creativity tests, the alternate uses test (AUT) and the Torrance test (TTCT). In all three tests, participants were asked to create as many original solutions and were scored for originality, flexibility and fluency. RESULTS The placebo group showed higher originality than the control group both in the CFG (p<0.04, effect size = 0.5) and in the AUT (p<0.05, effect size = 0.4), but not in the Torrance test. The placebo group also found more shapes outside of the standard categories found by a set of 100 CFG players in a previous study, a feature termed out-of-the-boxness (p<0.01, effect size = 0.6). CONCLUSIONS The findings indicate that placebo can enhance the originality aspect of creativity. This strengthens the view that placebo can be used not only to reduce negative clinical symptoms, but also to enhance positive aspects of cognition. Furthermore, we find that the impact of placebo on creativity can be tested by CFG, which can quantify multiple aspects of creative search without need for manual coding. This approach opens the way to explore the behavioral and neural mechanisms by which placebo might amplify creativity.
Collapse
Affiliation(s)
- Liron Rozenkrantz
- Theater lab, Weizmann Institute of Science, Rehovot, Israel
- Dept. Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
- Dept. Neuroscience, Weizmann Institute of Science, Rehovot, Israel
| | - Avraham E. Mayo
- Theater lab, Weizmann Institute of Science, Rehovot, Israel
- Dept. Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Tomer Ilan
- Theater lab, Weizmann Institute of Science, Rehovot, Israel
| | - Yuval Hart
- Theater lab, Weizmann Institute of Science, Rehovot, Israel
- Dept. Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Lior Noy
- Theater lab, Weizmann Institute of Science, Rehovot, Israel
- Dept. Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
- * E-mail: (LN); (UA)
| | - Uri Alon
- Theater lab, Weizmann Institute of Science, Rehovot, Israel
- Dept. Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
- * E-mail: (LN); (UA)
| |
Collapse
|