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Weilharter F, Rewitz K, Halperin I, Wolff W. The relationship between prescribed ratings of perceived exertion and force production in repeated isometric contractions. PSYCHOLOGY OF SPORT AND EXERCISE 2024; 73:102657. [PMID: 38719021 DOI: 10.1016/j.psychsport.2024.102657] [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: 09/21/2023] [Revised: 03/02/2024] [Accepted: 05/01/2024] [Indexed: 05/16/2024]
Abstract
Ratings of perceived exertion (RPE) are frequently used to monitor and prescribe exercise intensity. However, studies examining the shape and robustness of how feelings of effort map onto objective outputs are limited and report inconsistent results. To address this, we investigated whether (1) producing isometric forces according to RPE levels reliably leads to differences in force output, (2) if feelings of effort map linearly or non-linearly onto force output, and (3) if this mapping is robust when visual feedback and social facilitation are present. In a counterbalanced repeated measures design, N = 26 participants performed isometric handgrip contractions prescribed by ten levels of the Borg CR-10 scale. They did so either with or without the availability of concurrent visual feedback regarding their force production, and in the presence or absence of another person performing the same task simultaneously. We found that subjects reliably produced different force outputs that corresponded to each RPE level. Furthermore, concurrent visual feedback led to a linearization of force output, while in the absence of feedback, the produced forces could also be described by quadratic and cubic functions. Exploratory post-hoc analyses revealed that participants perceived moderate RPE levels to be more challenging to produce. By shedding light on the dynamic nature of the mapping between RPE and objective performance, our findings provide helpful insights regarding the utility of RPE scales.
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Affiliation(s)
- Felix Weilharter
- Department of Sport Science, University of Konstanz, Konstanz, Germany.
| | - Katja Rewitz
- Department of Sport Science, University of Konstanz, Konstanz, Germany; Dynamics of Human Performance Regulation Laboratory, Institute of Human Movement Science, University of Hamburg, Germany
| | - Israel Halperin
- Department of Health Promotion, School of Public Health, Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel; Sylvan Adams Sports Institute, Tel Aviv University, Tel Aviv, Israel
| | - Wanja Wolff
- Department of Sport Science, University of Konstanz, Konstanz, Germany; Department of Educational Psychology, University of Bern, Bern, Switzerland; Dynamics of Human Performance Regulation Laboratory, Institute of Human Movement Science, University of Hamburg, Germany
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Cogliati M, Cudicio A, Orizio C. Using force or EMG envelope as feedback signal for motor control system. J Electromyogr Kinesiol 2024; 74:102851. [PMID: 38048656 DOI: 10.1016/j.jelekin.2023.102851] [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: 05/12/2023] [Revised: 10/30/2023] [Accepted: 11/28/2023] [Indexed: 12/06/2023] Open
Abstract
PURPOSE This work studied muscle neuro-mechanics during symmetrical up-going ramp (UGR) and down-going ramp (DGR). AIM to evaluate during the modulation of muscular action the outcome of force feedback (FF) or neural feedback (NF) on the behavior of the trailing signals - i.e. the EMG envelope (eEMG) for FF or force signal for NF. METHOD Subjects: 20. Investigated muscles: dorsal interosseous (FDI) and tibialis anterior (TA). Detected signals: force and EMG. Visual feedback: force (FF), eEMG (NF). Effort triangles: ramps duration 7.5 s, vertex at 50 and 100 % of the maximal voluntary action. Eventually, each subject performed FF50%, FF100%, NF50% and NF100% per each muscle. In each condition the areas beneath the force and eEMG signals were computed to calculate the ratios between the DGR and UGR values during the different tasks (force area DGR / force area UGR; eEMG area DGR / eEMG area UGR). Electro-mechanical coupling efficiency (EMCE) was estimated through the eEMG area / force area ratio for both UGR and DGR in each condition. RESULTS a) FF. FDI: eEMG area ratio was 0.84 ± 0.15 and 0.73 ± 0.17 for FF50% and FF100%, respectively. TA: eEMG area ratio was 0.88 ± 0.11 and 0.91 ± 0.17 for FF50% and FF100%, respectively. b) NF: FDI: force area ratio was 1.18 ± 0.13 and 1.17 ± 0.13 for NF50% and NF100%, respectively. TA: force area ratio was 1.17 ± 0.21 and 1.07 ± 0.19 for NF50% and NF100%, respectively. c) DGR EMCE was greater than UGR EMCE in all four tasks. CONCLUSION The influence of UGR on deployed EMCE in the following force decrement phase underpins the changes of trailing signals area during DGR. This underlines the necessity of a careful evaluation of the features of FF or NF for experimental studies or rehabilitation purposes involving the motor control system.
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Affiliation(s)
- M Cogliati
- Department of Clinical and Experimental Sciences, University of Brescia, Viale Europa, 11, 25123 Brescia, Italy
| | - A Cudicio
- Department of Clinical and Experimental Sciences, University of Brescia, Viale Europa, 11, 25123 Brescia, Italy
| | - C Orizio
- Department of Clinical and Experimental Sciences, University of Brescia, Viale Europa, 11, 25123 Brescia, Italy.
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Weakley J, Cowley N, Schoenfeld BJ, Read DB, Timmins RG, García-Ramos A, McGuckian TB. The Effect of Feedback on Resistance Training Performance and Adaptations: A Systematic Review and Meta-analysis. Sports Med 2023; 53:1789-1803. [PMID: 37410360 PMCID: PMC10432365 DOI: 10.1007/s40279-023-01877-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/12/2023] [Indexed: 07/07/2023]
Abstract
BACKGROUND Augmented feedback is often used during resistance training to enhance acute physical performance and has shown promise as a method of improving chronic physical adaptation. However, there are inconsistencies in the scientific literature regarding the magnitude of the acute and chronic responses to feedback and the optimal method with which it is provided. OBJECTIVE This systematic review and meta-analysis aimed to (1) establish the evidence for the effects of feedback on acute resistance training performance and chronic training adaptations; (2) quantify the effects of feedback on acute kinematic outcomes and changes in physical adaptations; and (3) assess the effects of moderating factors on the influence of feedback during resistance training. METHODS Twenty studies were included in this systematic review and meta-analysis. This review was performed using the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. Four databases were searched, and studies were included if they were peer-reviewed investigations, written in English, and involved the provision of feedback during or following dynamic resistance exercise. Furthermore, studies must have evaluated either acute training performance or chronic physical adaptations. Risk of bias was assessed using a modified Downs and Black assessment tool. Multilevel meta-analyses were performed to quantify the effects of feedback on acute and chronic training outcomes. RESULTS Feedback enhanced acute kinetic and kinematic outputs, muscular endurance, motivation, competitiveness, and perceived effort, while greater improvements in speed, strength, jump performance, and technical competency were reported when feedback was provided chronically. Furthermore, greater frequencies of feedback (e.g., following every repetition) were found to be most beneficial for enhancing acute performance. Results demonstrated that feedback improves acute barbell velocities by approximately 8.4% (g = 0.63, 95% confidence interval [CI] 0.36-0.90). Moderator analysis revealed that both verbal (g = 0.47, 95% CI 0.22-0.71) and visual feedback (g = 1.11, 95% CI 0.61-1.61) were superior to no feedback, but visual feedback was superior to verbal feedback. For chronic outcomes, jump performance might have been positively influenced (g = 0.39, 95% CI - 0.20 to 0.99) and short sprint performance was likely enhanced (g = 0.47, 95% CI 0.10-0.84) to a greater extent when feedback is provided throughout a training cycle. CONCLUSIONS Feedback during resistance training can lead to enhanced acute performance within a training session and greater chronic adaptations. Studies included in our analysis demonstrated a positive influence of feedback, with all outcomes showing superior results than when no feedback is provided. For practitioners, it is recommended that high-frequency, visual feedback is consistently provided to individuals when they complete resistance training, and this may be particularly useful during periods of low motivation or when greater competitiveness is beneficial. Alternatively, researchers must be aware of the ergogenic effects of feedback on acute and chronic responses and ensure that feedback is standardised when investigating resistance training.
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Affiliation(s)
- Jonathon Weakley
- School of Behavioural and Health Sciences, Australian Catholic University, McAuley at Banyo, Brisbane, Australia.
- Sports Performance, Recovery, Injury and New Technologies (SPRINT) Research Centre, Australian Catholic University, Brisbane, QLD, Australia.
- Carnegie Applied Rugby Research (CARR) Centre, Carnegie School of Sport, Leeds Beckett University, Leeds, UK.
| | - Nicholas Cowley
- School of Behavioural and Health Sciences, Australian Catholic University, McAuley at Banyo, Brisbane, Australia
| | - Brad J Schoenfeld
- Department of Exercise Science and Recreation, CUNY Lehman College, Bronx, NY, USA
| | - Dale B Read
- Carnegie Applied Rugby Research (CARR) Centre, Carnegie School of Sport, Leeds Beckett University, Leeds, UK
- Department of Sport and Exercise Sciences, Institute of Sport, Manchester Metropolitan University, Manchester, UK
| | - Ryan G Timmins
- School of Behavioural and Health Sciences, Australian Catholic University, McAuley at Banyo, Brisbane, Australia
- Sports Performance, Recovery, Injury and New Technologies (SPRINT) Research Centre, Australian Catholic University, Brisbane, QLD, Australia
| | - Amador García-Ramos
- Department of Physical Education and Sport, Faculty of Sport Sciences, University of Granada, Granada, Spain
- Department of Sports Sciences and Physical Conditioning, Faculty of Education, Universidad Católica de la Santísima Concepción, Concepción, Chile
| | - Thomas B McGuckian
- School of Behavioural and Health Sciences, Australian Catholic University, McAuley at Banyo, Brisbane, Australia
- Healthy Brain and Mind Research Centre, School of Behavioural and Health Sciences, Australian Catholic University, Melbourne, Australia
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Individual Experiences with Being Pushed to Limits and Variables That Influence the Strength to Which These Are Felt: A Cross-Sectional Survey Study. J 2022. [DOI: 10.3390/j5030024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
In a 2021 survey, we found that “limit or suppression experiences” were related to a willingness to use enhancement technologies. However, the concept of “limit or suppression experiences” is vague and difficult to interpret in relation to neuroethics/enhancement. Thus, we aimed to better understand “limit or suppression experiences” and establish a robust philosophical concept of the topic. To do so, we exploratively investigated the concept to determine individual experiences with the presence or absence of sensing limits, investigate different ways in which limits can be sensed (factors of the sense of limits: “FSLs”), and identify factors that correlate with the strength of FSLs. Data from an Internet survey investigating respondents’ experiences with limits (1258 respondents) were analyzed using exploratory factor analysis and a linear regression model. Five variables were extracted as the FSLs. The highest regression coefficients were found between physical FSL and sports activities and between cognitive FSL and academics. The lowest regression coefficients were found between relational FSL and academics, sports activities, and arts and cultural activities. The results facilitate a detailed discussion of the motivations of enhancement users, and the extraction of the suppression experience opens new enhancement directions. Further normative and empirical studies are required.
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Marcel-Millet P, Gimenez P, Groslambert A, Ravier G, Grospretre S. The type of visual biofeedback influences maximal handgrip strength and activation strategies. Eur J Appl Physiol 2021; 121:1607-1616. [PMID: 33649937 DOI: 10.1007/s00421-021-04640-5] [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: 10/26/2020] [Accepted: 02/10/2021] [Indexed: 10/22/2022]
Abstract
PURPOSE This study investigated the effects of force and electromyographic (EMG) feedbacks on forearm muscle activations and handgrip maximal isometric voluntary contraction (MIVC). METHODS Sixteen males performed a set of MIVC in four different feedback conditions: (1) NO-FB: no feedback is given to the participant; (2) FORCE-FB: participants received a visual feedback of the produced force; (3) AGO-FB: participants received a visual feedback of the EMG activity of two agonist grip muscles; (4) ANTAGO-FB: participants received a visual feedback of the EMG activity of two hand extensors muscles. Each feedback was displayed by monitoring the signal of either force or electrical activity of the corresponding muscles. RESULTS Compared to NO-FB, FORCE-FB was associated with a higher MIVC force (+ 11%, P < 0.05), a higher EMG activity of agonist and antagonist muscles (+ 8.7% and + 9.2%, respectively, P < 0.05) and a better MIVC/EMG ratio with the agonist muscles (P < 0.05). AGO-FB was associated with a higher EMG activity of agonist muscles (P < 0.05) and ANTAGO-FB was associated with a higher EMG activity of antagonist muscles (P < 0.05). MIVC force was higher in the agonist feedback condition than in the antagonist feedback condition (+ 5.9%, P < 0.05). CONCLUSION Our results showed that the MIVC force can be influenced by different visuals feedback, such as force or EMG feedbacks. Moreover, these results suggested that the type of feedback employed could modify the EMG-to-force relationships. Finally, EMG biofeedback could represent an interesting tool to optimize motor strategies. But in the purpose of performing the highest strength independently of the strategy, the force feedback should be recommended.
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Affiliation(s)
- Philémon Marcel-Millet
- EA4660, C3S Laboratory, UPFR Sports, University of Bourgogne Franche-Comté, 31, Chemin de l'Epitaphe, 25000, Besançon, France
| | - Philippe Gimenez
- EA4660, C3S Laboratory, UPFR Sports, University of Bourgogne Franche-Comté, 31, Chemin de l'Epitaphe, 25000, Besançon, France
| | - Alain Groslambert
- EA4660, C3S Laboratory, UPFR Sports, University of Bourgogne Franche-Comté, 31, Chemin de l'Epitaphe, 25000, Besançon, France
| | - Gilles Ravier
- EA4660, C3S Laboratory, UPFR Sports, University of Bourgogne Franche-Comté, 31, Chemin de l'Epitaphe, 25000, Besançon, France
| | - Sidney Grospretre
- EA4660, C3S Laboratory, UPFR Sports, University of Bourgogne Franche-Comté, 31, Chemin de l'Epitaphe, 25000, Besançon, France.
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Galek KE, Bice EM. The Influence of Surface Electromyography Visual and Clinician Verbal Feedback on Swallow Effort Ratio at Different Bolus Volumes in a Healthy Population. Folia Phoniatr Logop 2020; 73:449-454. [PMID: 33279898 DOI: 10.1159/000511497] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Accepted: 09/07/2020] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND/AIMS The effortful swallow is a common treatment intervention requiring increased intensity to facilitate adaptations and modify swallow kinematics. The type of feedback and bolus volume provided may influence the intensity of the effortful swallow. To determine the increased effortful swallow intensity, a clinician can collect the peak amplitude of an effortful swallow and a typical swallow and compute a "swallow effort ratio" (SER). Dividing the effortful swallow surface electromyography (sEMG) peak amplitude by the typical swallow sEMG peak amplitude derives the SER. A higher SER suggests increased intensity. An increase in the SER may have clinical relevance in swallowing therapy as a threshold of intensity is required to elicit neuroplastic change. The purpose of this investigation was to determine whether sEMG visual and clinician verbal feedback increases the SER. Additionally, the investigation examined whether the SER is influenced by different liquid bolus volumes. METHODS Eighty-two nondysphagic, healthy adults were assigned at random to 2 groups. One group received no feedback, and the other received verbal and visual feedback while performing typical and effortful swallows at 3 liquid volumes. RESULTS An analysis of covariance compared the typical and effortful peak swallow amplitudes among 3 volumes in the 2 feedback groups. There was a significant effect on the peak amplitude values by feedback group F(2, 79) = 22.82, p < 0.001. There were no differences in peak amplitude by volume regardless of feedback F(2, 78) = 0.413, p = 0.663. CONCLUSION It appears that sEMG visual and clinician verbal feedback increases the SER, which may be a surrogate for intensity. An increased SER may have a positive effect on swallow intervention as intensity is known to influence outcomes of exercise and elicit neuroplastic change.
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Affiliation(s)
- Kristine E Galek
- Speech-Language Pathology and Audiology, University of Nevada, Reno School of Medicine, Reno, Nevada, USA,
| | - Ed M Bice
- Clinical Education, IOPI Medical, Woodinville, Washington, USA
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Vanderka M, Bezák A, Longová K, Krčmár M, Walker S. Use of Visual Feedback During Jump-Squat Training Aids Improvement in Sport-Specific Tests in Athletes. J Strength Cond Res 2020; 34:2250-2257. [PMID: 32735427 DOI: 10.1519/jsc.0000000000002634] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Vanderka, M, Bezák, A, Longová, K, Krčmár, M, and Walker, S. Use of visual feedback during jump-squat training aids improvement in sport-specific tests in athletes. J Strength Cond Res 34(8): 2250-2257, 2020-This study investigated the effects of instantaneous performance feedback during the jump-squat exercise over a 6-week training period. Twenty-five strength-trained athletes were randomly divided into an instant feedback (n = 13, half-squat 3-repetition maximum (3RM)/body mass = 2.38 ± 0.19) or a nonfeedback (n = 12, half-squat 3RM/body mass = 2.03 ± 0.44) group. Both groups performed the same training program (3 × week), consisting of 4 sets of 8 repetitions (weeks 1-3) and 8 sets of 4 repetitions (weeks 4-6) using a barbell with a load that maximized the average concentric power output (Pmax) of each athlete. Subjects in the instant feedback group were given real-time data after each repetition. Pre-, mid-, and post-training testing consisted of maximum 20-, 30-, and 50-m running speed, 3RM back half-squat load, Pmax and the load that maximized average concentric power output (Pmax load), countermovement jump (CMJ), and squat jump (SJ) height. Results revealed that the feedback group significantly improved all selected tests vs. nonfeedback (time × group interaction, p < 0.01). Significant improvements after training for 20, 30, 50 m, 3RM load, Pmax load, CMJ, and SJ were observed in the feedback group only (p < 0.01). Training without instant feedback did not lead to significant performance improvements; this group actually demonstrated significant decreases in SJ and Pmax (W) and Pmax load (p < 0.05). The results of this study indicate that the use of instant feedback during jump-squat training in athletes was beneficial for improving multiple performance tasks over 6 weeks of training. Instant feedback is an important element of power training to maximize adaptations when training strength-trained athletes.
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Affiliation(s)
- Marián Vanderka
- Department of Track and Field, Faculty of Physical Education and Sport, Comenius University, Bratislava, Slovakia
| | - Anton Bezák
- Department of Track and Field, Faculty of Physical Education and Sport, Comenius University, Bratislava, Slovakia
| | - Katarína Longová
- Department of Track and Field, Faculty of Physical Education and Sport, Comenius University, Bratislava, Slovakia
| | - Matúš Krčmár
- Hamar Institute for Human Performance, Faculty of Physical Education and Sport, Comenius University, Bratislava, Slovakia; and
| | - Simon Walker
- Neuromuscular Research Center, Faculty of Sport and Health Sciences, University of Jyväskylä, Jyväskylä, Finland
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Sanford S, Liu M, Selvaggi T, Nataraj R. Effects of Visual Feedback Complexity on the Performance of a Movement Task for Rehabilitation. J Mot Behav 2020; 53:243-257. [PMID: 32496974 DOI: 10.1080/00222895.2020.1770670] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
This study investigated the effects of visual feedback (VF) complexity on movement performance to potentially optimize the design of VF-based rehabilitation. We evaluated the effects of VF complexity on performance of the two-legged squat during training with concurrent (real-time) VF and short-term retention with no VF. Four VF cases were employed to train spatial positioning of the thigh segment in unique combinations of complexity (simple, complex) and representation of body-discernibility (abstract, representative). Eighteen able-bodied subjects attempted to minimize the error between individual body segment positions and a target trajectory during concurrent VF and short-term retention tests. Complex-representative VF demonstrated greater potential for training with increased performance consistency in both motion and muscle activity patterns.
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Affiliation(s)
- Sean Sanford
- Movement Control Rehabilitation (MOCORE) Laboratory, Altorfer Complex, Stevens Institute of Technology, Hoboken, NJ, USA.,Department of Biomedical Engineering, Stevens Institute of Technology, Hoboken, NJ, USA
| | - Mingxiao Liu
- Movement Control Rehabilitation (MOCORE) Laboratory, Altorfer Complex, Stevens Institute of Technology, Hoboken, NJ, USA.,Department of Biomedical Engineering, Stevens Institute of Technology, Hoboken, NJ, USA
| | - Thomas Selvaggi
- Movement Control Rehabilitation (MOCORE) Laboratory, Altorfer Complex, Stevens Institute of Technology, Hoboken, NJ, USA.,Department of Mechanical Engineering, Stevens Institute of Technology, Hoboken, NJ, USA
| | - Raviraj Nataraj
- Movement Control Rehabilitation (MOCORE) Laboratory, Altorfer Complex, Stevens Institute of Technology, Hoboken, NJ, USA.,Department of Biomedical Engineering, Stevens Institute of Technology, Hoboken, NJ, USA
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McGuire J, Green L, Calder K, Patterson J, Gabriel DA. The effects of massed versus distributed contractions on the variability of maximal isometric force. Exp Brain Res 2014; 232:2293-304. [DOI: 10.1007/s00221-014-3922-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2013] [Accepted: 03/18/2014] [Indexed: 11/28/2022]
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Lauber B, Keller M. Improving motor performance: Selected aspects of augmented feedback in exercise and health. Eur J Sport Sci 2012; 14:36-43. [DOI: 10.1080/17461391.2012.725104] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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