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FUKUHARA S, OKA H. Pedaling stroke length effects on the muscle mechanical and electrical activity during recumbent cycling. GAZZETTA MEDICA ITALIANA ARCHIVIO PER LE SCIENZE MEDICHE 2021. [DOI: 10.23736/s0393-3660.20.04516-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Piucco T, Diefenthaeler F, Prosser A, Bini R. Validity of different EMG analysis methods to identify aerobic and anaerobic thresholds in speed skaters. J Electromyogr Kinesiol 2020; 52:102425. [PMID: 32413828 DOI: 10.1016/j.jelekin.2020.102425] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2019] [Revised: 04/06/2020] [Accepted: 04/29/2020] [Indexed: 11/30/2022] Open
Abstract
PURPOSE This study aimed to assess the validity of the first (EMGth1) and second (EMGth2) breakpoints in the EMG signal during skating. SCOPE Ten well-trained long track speed skaters performed a maximal incremental skating test on a slide board. EMG signals from six lower limb muscles were recorded during the last 15 s of each stage and converted to Root Mean Square for determination EMGth1 and EMGth2 using mathematical (2 and 3 linear regressions) and visual methods. CONCLUSIONS EMGth1 had a low detection rate (<50%) while EMGth2 could be identified visually in > 80% of cases, in 85% of cases using 2-lines and 63% using 3-lines regression. Quads (VL + VM) and Gluts (GM + GMd) had the highest EMGth2 detection rate for all methods (>70%). EMGth2 from Quads and Gluts detected by the 2-lines and 3-lines regression were not different than the second ventilatory threshold (VT2) (p > 0.05), while the visual method overestimated VT2 (p < 0.01). EMGth2 detected from Quads by the 2-lines regression method presented better correlation with VT2 stage (r = 0.91), lowest bias, and limit of agreement. We conclude that EMG is a valid non-invasive method to detect VT2 during skating when using a mathematical method to determine EMGth2.
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Affiliation(s)
- Tatiane Piucco
- Health and Physical Education Department, Mount Royal University, Mount Royal Gate SW, Calgary, AB T3E 6K6, Canada.
| | - Fernando Diefenthaeler
- Center of Sports, Federal University of Santa Catarina, UFSC Campus Trindade, Av. César Seara, Florianópolis, SC 88040-900, Brazil
| | - Anthony Prosser
- Health and Physical Education Department, Mount Royal University, Mount Royal Gate SW, Calgary, AB T3E 6K6, Canada
| | - Rodrigo Bini
- Rural Health School, Flora Hill Campus, La Trobe University, Bendigo 3550, Victoria, Australia
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Song M, Li L, Guo J, Liu T, Li S, Wang Y, Qurat ul ain, Wang J. A new method for muscular visual fatigue detection using electrooculogram. Biomed Signal Process Control 2020. [DOI: 10.1016/j.bspc.2020.101865] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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Jammes Y, Behr M, Weber JP, Berdah S. Consequences of simulated car driving at constant high speed on the sensorimotor control of leg muscles and the braking response. Clin Physiol Funct Imaging 2016; 37:767-775. [PMID: 27381059 DOI: 10.1111/cpf.12383] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2016] [Accepted: 06/06/2016] [Indexed: 11/28/2022]
Abstract
Due to the increase in time spent seated in cars, there is a risk of fatigue of the leg muscles which adjust the force exerted on the accelerator pedal. Any change in their sensorimotor control could lengthen the response to emergency braking. Fourteen healthy male subjects (mean age: 42 ± 4 years) were explored. Before and after a 1-h driving trial at 120 km h-1 , we measured the braking response, the maximal leg extension and foot inversion forces, the tonic vibratory response (TVR) in gastrocnemius medialis (GM) and tibialis anterior (TA) muscles to explore the myotatic reflex, and the Hoffmann reflex (H-reflex). During driving, surface electromyograms (EMGs) of GM and TA were recorded and the ratio between high (H) and low (L) EMG energies allowed to evaluate the recruitment of high- and low-frequency motor unit discharges. During driving, the H/L ratio decreased in TA, whereas modest and often no significant H/L changes occurred in GM muscle. After driving, the maximal foot inversion force decreased (-19%), while the leg extension force did not vary. Reduced TVR amplitude (-29%) was measured in TA, but no H-reflex changes were noted. The braking reaction time was not modified after the driving trial. Driving at constant elevated speed reduced the myotatic reflex and the recruitment of motor units in TA muscle. The corresponding changes were rarely present in the GM muscle that plays a key role in the braking response, and this could explain the absence of a reduced braking reaction time.
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Affiliation(s)
- Yves Jammes
- UMR MD2, Faculty of Medicine, Aix Marseille University, Marseille, France
| | - Michel Behr
- IFSTTAR LBA UMR T24, Aix Marseille University, Marseille, France
| | | | - Stephane Berdah
- IFSTTAR LBA UMR T24, Aix Marseille University, Marseille, France
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Gravier G, Delliaux S, Delpierre S, Guieu R, Jammes Y. Inter-individual differences in breathing pattern at high levels of incremental cycling exercise in healthy subjects. Respir Physiol Neurobiol 2013; 189:59-66. [DOI: 10.1016/j.resp.2013.06.027] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2013] [Revised: 06/26/2013] [Accepted: 06/28/2013] [Indexed: 10/26/2022]
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Glazer HI, Hacad CR. The Glazer Protocol: Evidence-Based Medicine Pelvic Floor Muscle (PFM) Surface Electromyography (SEMG). ACTA ACUST UNITED AC 2012. [DOI: 10.5298/1081-5937-40.2.4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The authors cite a Medline review article of biofeedback for urinary incontinence to demonstrate the pervasive lack of standardized operationally defined variables, which precludes the application of evidence-based-medicine standards to the field. As an example of an early-stage evidence-based-medicine model, the Glazer Protocol demonstrates how empirically derived and operationally defined SEMG characteristics hold great promise for a better understanding of the pathophysiology of urinary incontinence and can assist in both diagnosis and treatment of this disorder.
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Affiliation(s)
- Howard I. Glazer
- Weill College of Medicine, Cornell University, Ithaca, NY, and New York Presbyterian Hospital, New York, NY
| | - Claudia R. Hacad
- Federal University of São Paulo, UNIFESP, São Paulo, Brazil, and Urinary Continence Center of Lithocenter, Nossa Senhora de Lourdes Hospital, São Paulo, Brazil
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Tikkanen O, Hu M, Vilavuo T, Tolvanen P, Cheng S, Finni T. Ventilatory threshold during incremental running can be estimated using EMG shorts. Physiol Meas 2012; 33:603-14. [DOI: 10.1088/0967-3334/33/4/603] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Bouillard K, Guével A, Hug F. The electromyographic fatigue threshold is not a valid tool to assess muscle function. J Electromyogr Kinesiol 2010; 21:229-35. [PMID: 21087872 DOI: 10.1016/j.jelekin.2010.10.012] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2010] [Revised: 10/07/2010] [Accepted: 10/07/2010] [Indexed: 01/19/2023] Open
Abstract
The present study aimed at determining the electromyographic fatigue threshold (EMG(FT)) from the EMG activity level and the EMG frequency content of the First Dorsal Interosseous. Thirty-seven healthy subjects performed seven isometric index abductions at randomly ordered percentages of maximal voluntary contraction (i.e., 20%, 25%, 30%, 35%, 40%, 50% and 60%). During these bouts, surface EMG was measured using a linear electrodes array (i.e., seven EMG channels) in the First Dorsal Interosseous. For each subject the EMG(FT) was determined from both Root Mean Square (RMS) and Mean Power Frequency (MPF) values, only if the following criteria were met: (i) significant positive linear regression (P<0.05) between force and slope coefficient, (ii) an adjusted coefficient of determination for force versus slope coefficient relationship greater than 0.85, and (iii) a standard error for the EMG(FT) below 5% of MVC. The results showed the inability to determine an EMG(FT) in all of the 37 subjects from both RMS (9 out of 37 subjects) and MPF (27 out of 37 subjects). In addition, for the 12 subjects tested twice, the reproducibility of the EMG(FT) determination was weak (ICC=-0.029 and SEM=7.5% of MVC for EMG(FT) determined from MPF). The present results suggest that the EMG(FT) is not a valid tool to assess muscle function.
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Affiliation(s)
- Killian Bouillard
- University of Nantes, Laboratory «Motricité, Interactions, Performance» (EA 4334), F-44000, Nantes, France
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Guilhem G, Dorel S, Hug F. Effects of a prior short simulated training session on the subsequent occurrence of ventilatory thresholds. J Sci Med Sport 2009; 12:273-9. [DOI: 10.1016/j.jsams.2007.11.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2007] [Revised: 09/25/2007] [Accepted: 11/07/2007] [Indexed: 10/21/2022]
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Hug F, Dorel S. Electromyographic analysis of pedaling: a review. J Electromyogr Kinesiol 2008; 19:182-98. [PMID: 18093842 DOI: 10.1016/j.jelekin.2007.10.010] [Citation(s) in RCA: 165] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2007] [Revised: 10/30/2007] [Accepted: 10/30/2007] [Indexed: 11/24/2022] Open
Abstract
Although pedaling is constrained by the circular trajectory of the pedals, it is not a simple movement. This review attempts to provide an overview of the pedaling technique using an electromyographic (EMG) approach. Literature concerning the electromyographic analysis of pedaling is reviewed in an effort to make a synthesis of the available information, and to point out its relevance for researchers, clinicians and/or cycling/triathlon trainers. The first part of the review depicts methodological aspects of the EMG signal recording and processing. We show how the pattern of muscle activation during pedaling can be analyzed in terms of muscle activity level and muscle activation timing. Muscle activity level is generally quantified with root mean square or integrated EMG values. Muscle activation timing is studied by defining EMG signal onset and offset times that identify the duration of EMG bursts and, more recently, by the determination of a lag time maximizing the cross-correlation coefficient. In the second part of the review, we describe whether the patterns of the lower limb muscles activity are influenced by numerous factors affecting pedaling such as power output, pedaling rate, body position, shoe-pedal interface, training status and fatigue. Some research perspectives linked to pedaling performance are discussed throughout the manuscript and in the conclusion.
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Affiliation(s)
- François Hug
- University of Nantes, Nantes Atlantic Universities, Laboratory Motricity, Interactions, Performance (JE 2438), F-44000 Nantes, France.
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Mello RGT, Jesus IRT, Buarque RF, Oliveira LF, Nadal J. Detection of ventilatory threshold by an automatic parabolic model. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2008; 2008:1064-1067. [PMID: 19162846 DOI: 10.1109/iembs.2008.4649343] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
This work aims at presenting a method for automatic detection of the ventilatory threshold by modeling ventilatory equivalent of oxygen by a parabolic function. Thirty healthy male subjects were submitted to a single maximal oxygen uptake test, being monitored the ventilatory gas exchange signals. Ventilatory threshold by visual inspection, automatic v-slope and parabolic function methods was compared. The automatic methods showed no significant differences with visual inspection, but the parabolic technique presented higher consistence than v-slope. Since the parabolic method have low computation cost and is a simple method, it can be recommended as an alternative choice to v-slope method.
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Affiliation(s)
- Roger G T Mello
- Biomedical Engineering Program, COPPE, Federal University of Rio de Janeiro, P. O. Box 68.510, Rio de Janeiro RJ 21941-972, Brazil.
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Morris SL, Allison GT. Effects of abdominal muscle fatigue on anticipatory postural adjustments associated with arm raising. Gait Posture 2006; 24:342-8. [PMID: 16406623 DOI: 10.1016/j.gaitpost.2005.10.011] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/11/2005] [Revised: 10/11/2005] [Accepted: 10/20/2005] [Indexed: 02/02/2023]
Abstract
Anticipatory postural adjustments (APAs) are postulated to ameliorate the effects of the disturbance to posture caused by voluntary movement. The primary hypothesis tested in our study was that the magnitude of anticipatory trunk muscle activity is altered by abdominal muscle fatigue. A subsidiary aim of the present study was to examine the directional nature of APAs and use this information to elucidate the central or peripheral nature of changes in postural muscle activity associated with abdominal muscle fatigue. The present study was a within subject design, where abdominal muscle fatigue was induced by a static abdominal curl. Surface EMG was used to assess postural muscle activity in the following trunk muscles; rectus abdominis, erector spinae and internal oblique. Following abdominal muscle fatigue, the magnitude of muscle activity during APAs was significantly reduced by 20% in both the rectus abdominis (fatigued muscle) and the erector spinae (not fatigued) indicating a central rather than peripheral fatigue effect on muscle activity. Abdominal muscle fatigue also induced a 30% increase in the baseline muscle activity of the internal oblique. The changes in magnitude of APA muscle activity may reflect a change in system gain or a change in postural control perhaps related to a change in perceived postural stability. An increase in baseline muscle activity in the internal oblique may compensate partially for the reduction in APAs.
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Affiliation(s)
- S L Morris
- The Centre for Musculoskeletal Studies School of Surgery and Pathology, The Faculty of Medicine and Dentistry, The University of Western Australia, Level 2 Medical Research Foundation Building, Perth, WA 6000, Australia.
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Steinberg JG, Delliaux S, Jammes Y. Reliability of different blood indices to explore the oxidative stress in response to maximal cycling and static exercises. Clin Physiol Funct Imaging 2006; 26:106-12. [PMID: 16494601 DOI: 10.1111/j.1475-097x.2006.00658.x] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
This study compares the changes in four blood markers of exercise-induced oxidative stress in response to exercise protocols commonly used to explore the global muscle performance at work (maximal incremental cycle) and endurance to fatigue of selected muscles (static handgrip and thumb adduction). Cycling and static exercises allow the muscle to work in aerobic and anaerobic conditions, respectively. Healthy adults performed an incremental cycling exercise until volitional exhaustion and, on separated days, executed infra-maximal static thumb adduction and handgrip until exhaustion. Exercise-induced oxidative stress was assessed by the increased plasma concentration of thiobarbituric acid reactive substances (TBARS), the consumption of plasma reduced ascorbic acid (RAA), and erythrocyte reduced glutathione (GSH) antioxidants, and the changes in the total antioxidant status (TAS) of plasma. Five minutes after the end of the incremental cycling exercise, we measured a peak increase in TBARS level, maximal consumption of GSH and RAA, and a modest but significant decrease in TAS concentration. In response to both static thumb adduction and handgrip, significant variations of TBARS, GSH and RAA occurred but we did not measure any significant change in TAS level throughout the 20-min recovery period of both exercise bouts. The present study shows that only the changes in TBARS, GSH and RAA explore both dynamic and static exercises. In addition, TAS measurement does not seem to represent a reliable and unique tool to explore exercise-induced oxidative stress, at least during isometric efforts that allow the muscle to work under anaerobic condition.
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Affiliation(s)
- Jean Guillaume Steinberg
- Service des Explorations Fonctionnelles Respiratoires, Assistance Publique-Hôpitaux de Marseille and Laboratoire de Physiopathologie Respiratoire (UPRES EA 2201), Faculté de Médecine, Institut Jean Roche, Université de la Méditerranée, France
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