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Resveratrol administration reduces pain perception but does not attenuate force loss following exercise-induced muscle damage. SPORT SCIENCES FOR HEALTH 2022. [DOI: 10.1007/s11332-021-00889-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Oliveira AS, Negro F. Neural control of matched motor units during muscle shortening and lengthening at increasing velocities. J Appl Physiol (1985) 2021; 130:1798-1813. [PMID: 33955258 DOI: 10.1152/japplphysiol.00043.2021] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Modulation of movement velocity is necessary during daily life tasks, work, and sports activities. However, assessing motor unit behavior during muscle shortening and lengthening at different velocities is challenging. High-density surface electromyography (HD-sEMG) is an established method to identify and track motor unit behavior in isometric contractions. Therefore, we used this methodology to unravel the behavior of the same motor units in dynamic contractions at low contraction velocities. Velocity-related changes in tibialis anterior motor unit behavior during concentric and eccentric contractions at 10% and 25% maximum voluntary isometric contraction were assessed by decomposing HD-sEMG signals recorded from the tibialis anterior muscle of eleven healthy participants at 5°/s, 10°/s, and 20°/s. Motor units extracted from the dynamic contractions were tracked across different velocities at the same load levels. On average, 14 motor units/participant were matched across different velocities, showing specific changes in discharge rate modulation. Specifically, increased velocity led to an increased rate of change in discharge rate (e.g., discharge rate slope, P = 0.025), recruitment and derecruitment discharge rates (P = 0.003 and P = 0.001), and decreased recruitment angles (P = 0.0001). Surprisingly, the application of the motor unit extraction filters calculated from 20°/s onto the recordings at 5°/s and 10°/s revealed that >92% of motor units recruited at the highest velocity were active on both lower velocities, indicating no additional recruitment of motor units. Our results suggest that motor unit rate coding rather than recruitment is responsible for controlling muscle shortening and lengthening contractions at increasing velocities against a constant load.NEW & NOTEWORTHY The control of movement velocity is accomplished by the modulation of the neural drive to muscle and its variation over time. In this study, we tracked motor units decomposed from HD-sEMG across shortening and lengthening contractions at increasing velocities in two submaximal load levels. We demonstrate that concentric and eccentric contractions of the tibialis anterior muscle at slow velocities are achieved by specific motor unit rate coding strategies rather than distinct recruitment schemes.
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Affiliation(s)
| | - Francesco Negro
- Department of Clinical and Experimental Sciences, Università degli Studi di Brescia, Brescia, Italy
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González-Ravé JM, Naclerio F, Parrilla I, Amores IY, González-Mohíno F. Adaptations of short-term high-velocity isokinetic training vs. short-term plyometric training on vertical jump and isokinetic performance in physically active people. ISOKINET EXERC SCI 2019. [DOI: 10.3233/ies-192107] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
| | - Fernando Naclerio
- Department of Life and Sport Science, University of Greenwich, London, UK
| | - Isabel Parrilla
- Sport Training Laboratory, University of Castilla la Mancha, Toledo, Spain
| | | | - Fernando González-Mohíno
- Sport Training Laboratory, University of Castilla la Mancha, Toledo, Spain
- Facultad de Lenguas y Educación, Universidad Nebrija, Madrid, Spain
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Christiansen TL, Niazi IK, Holt K, Nedergaard RW, Duehr J, Allen K, Marshall P, Türker KS, Hartvigsen J, Haavik H. The effects of a single session of spinal manipulation on strength and cortical drive in athletes. Eur J Appl Physiol 2018; 118:737-749. [PMID: 29327170 PMCID: PMC5843672 DOI: 10.1007/s00421-018-3799-x] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2017] [Accepted: 01/01/2018] [Indexed: 11/11/2022]
Abstract
Purpose The primary purpose of this study was to investigate whether a single session of spinal manipulation (SM) increases strength and cortical drive in the lower limb (soleus muscle) of elite Taekwondo athletes. Methods Soleus-evoked V-waves, H-reflex and maximum voluntary contraction (MVC) of the plantar flexors were recorded from 11 elite Taekwondo athletes using a randomized controlled crossover design. Interventions were either SM or passive movement control. Outcomes were assessed at pre-intervention and at three post-intervention time periods (immediate post, post 30 min and post 60 min). A multifactorial repeated measures ANOVA was conducted to assess within and between group differences. Time and session were used as factors. A post hoc analysis was carried out, when an interactive effect was present. Significance was set at p ≤ 0.05. Results SM increased MVC force [F(3,30) = 5.95, p < 0.01], and V-waves [F(3,30) = 4.25, p = 0.01] over time compared to the control intervention. Between group differences were significant for all time periods (p < 0.05) except for the post60 force measurements (p = 0.07). Conclusion A single session of SM increased muscle strength and corticospinal excitability to ankle plantar flexor muscles in elite Taekwondo athletes. The increased MVC force lasted for 30 min and the corticospinal excitability increase persisted for at least 60 min.
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Affiliation(s)
- Thomas Lykke Christiansen
- Department of Sports Science and Clinical Biomechanics, University of Southern Denmark, Odense, Denmark.,Nordic Institute of Chiropractic and Clinical Biomechanics, Odense, Denmark
| | - Imran Khan Niazi
- Center for Chiropractic Research, New Zealand College of Chiropractic, 6 Harrison Road, Mount Wellington, Auckland, New Zealand. .,SMI, Department of Health Science and Technology, Aalborg University, Aalborg, Denmark.
| | - Kelly Holt
- Center for Chiropractic Research, New Zealand College of Chiropractic, 6 Harrison Road, Mount Wellington, Auckland, New Zealand
| | - Rasmus Wiberg Nedergaard
- Center for Chiropractic Research, New Zealand College of Chiropractic, 6 Harrison Road, Mount Wellington, Auckland, New Zealand
| | - Jens Duehr
- Center for Chiropractic Research, New Zealand College of Chiropractic, 6 Harrison Road, Mount Wellington, Auckland, New Zealand
| | - Kathryn Allen
- Center for Chiropractic Research, New Zealand College of Chiropractic, 6 Harrison Road, Mount Wellington, Auckland, New Zealand
| | - Paul Marshall
- School of Science and Health, Western Sydney University, Sydney, Australia
| | | | - Jan Hartvigsen
- Department of Sports Science and Clinical Biomechanics, University of Southern Denmark, Odense, Denmark.,Nordic Institute of Chiropractic and Clinical Biomechanics, Odense, Denmark
| | - Heidi Haavik
- Center for Chiropractic Research, New Zealand College of Chiropractic, 6 Harrison Road, Mount Wellington, Auckland, New Zealand
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Avelar BP, Costa JNDA, Safons MP, Dutra MT, Bottaro M, Gobbi S, Tiedemann A, de David AC, Lima RM. Balance Exercises Circuit improves muscle strength, balance, and functional performance in older women. AGE (DORDRECHT, NETHERLANDS) 2016; 38:14. [PMID: 26802006 PMCID: PMC5005874 DOI: 10.1007/s11357-016-9872-7] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2015] [Accepted: 01/07/2016] [Indexed: 06/05/2023]
Abstract
This study introduces the Balance Exercises Circuit (BEC) and examines its effects on muscle strength and power, balance, and functional performance in older women. Thirty-five women aged 60+ (mean age = 69.31, SD = 7.35) were assigned to either a balance exercises group (BG, n = 14) that underwent 50-min sessions twice weekly, of a 12-week BEC program, or a wait-list control group (CG, n = 21). Outcome measures were knee extensor peak torque (PT), rate of force development (RFD), balance, Timed Up & Go (TUG), 30-s chair stand, and 6-min walk tests, assessed at baseline and 12 weeks. Twenty-three participants completed follow-up assessments. Mixed analysis of variance models examined differences in outcomes. The BG displayed improvements in all measures at follow-up and significantly improved compared with CG on, isokinetic PT60, PT180 (p = 0.02), RFD (p < 0.05), balance with eyes closed (p values range .02 to <.01) and TUG (p = 0.03), all with medium effect sizes. No changes in outcome measures were observed in the CG. BEC improved strength, power, balance, and functionality in older women. The BEC warrants further investigation as a fall prevention intervention.
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Affiliation(s)
| | | | | | | | - Martim Bottaro
- Faculdade de Educação Física, Universidade of Brasilia, Brasilia, Brazil
| | - Sebastião Gobbi
- Instituto de Biociências, Universidade Estadual Paulista - Rio Claro, Rio Claro, Brazil
| | - Anne Tiedemann
- Musculoskeletal Division, The George Institute for Global Health, University of Sydney, Sydney, Australia
- Falls and Balance Research Group, Neuroscience Research Australia, University of New South Wales, Sydney, Australia
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Postactivation potentiation biases maximal isometric strength assessment. BIOMED RESEARCH INTERNATIONAL 2014; 2014:126961. [PMID: 25133157 PMCID: PMC4123488 DOI: 10.1155/2014/126961] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/27/2014] [Revised: 06/20/2014] [Accepted: 07/01/2014] [Indexed: 11/25/2022]
Abstract
Postactivation potentiation (PAP) is known to enhance force production. Maximal isometric strength assessment protocols usually consist of two or more maximal voluntary isometric contractions (MVCs). The objective of this study was to determine if PAP would influence isometric strength assessment. Healthy male volunteers (n = 23) performed two five-second MVCs separated by a 180-seconds interval. Changes in isometric peak torque (IPT), time to achieve it (tPTI), contractile impulse (CI), root mean square of the electromyographic signal during PTI (RMS), and rate of torque development (RTD), in different intervals, were measured. Significant increases in IPT (240.6 ± 55.7 N·m versus 248.9 ± 55.1 N·m), RTD (746 ± 152 N·m·s−1versus 727 ± 158 N·m·s−1), and RMS (59.1 ± 12.2% RMSMAX
versus 54.8 ± 9.4% RMSMAX) were found on the second MVC. tPTI decreased significantly on the second MVC (2373 ± 1200 ms versus 2784 ± 1226 ms). We conclude that a first MVC leads to PAP that elicits significant enhancements in strength-related variables of a second MVC performed 180 seconds later. If disconsidered, this phenomenon might bias maximal isometric strength assessment, overestimating some of these variables.
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Oliveira AS, Caputo F, Aagaard P, Corvino RB, Gonçalves M, Denadai BS. Isokinetic eccentric resistance training prevents loss in mechanical muscle function after running. Eur J Appl Physiol 2013; 113:2301-11. [PMID: 23680937 DOI: 10.1007/s00421-013-2660-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2012] [Accepted: 05/07/2013] [Indexed: 10/26/2022]
Abstract
The aim of the study was to verify whether 8 weeks of resistance training employing maximal isokinetic eccentric (IERT) knee extensor actions would reduce the acute force loss observed after high-intensity treadmill running exercise. It was hypothesized that specific IERT would induce protective effects against muscle fatigue and ultrastructural damages, preventing or reducing the loss in mechanical muscle function after running. Subjects were tested before and after IERT protocol for maximal isometric, concentric and eccentric isokinetic knee extensor strength (60° and 180° s(-1)). In a second session, subjects performed treadmill running (~35 min) and the previously mentioned measurements were repeated immediately after running. Subsequently, subjects were randomized to training (n = 12) consisting of 24 sessions of maximal IERT knee extensors actions at 180° s(-1), or served as controls (n = 8). The effects of acute running-induced fatigue and training on isokinetic and isometric peak torque, and rate of force development (RFD) were investigated. Before IERT, running-induced eccentric torque loss at 180° s(-1) was -8 %, and RFD loss was -11 %. Longitudinal IERT led to reduced or absent acute running-induced losses in maximal IERT torque at 180° s(-1) (+2 %), being significantly reduced compared to before IERT (p < 0.05), however, RFD loss remained at -11 % (p > 0.05). In conclusion, IERT yields a reduced strength loss after high-intensity running workouts, which may suggest a protective effect against fatigue and/or morphological damages. However, IERT may not avoid reductions in explosive muscle actions. In turn, this may allow more intense training sessions to be performed, facilitating the adaptive response to running training.
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Affiliation(s)
- Anderson Souza Oliveira
- Human Performance Laboratory, São Paulo State University, UNESP, Av. 24 A, 1515, Bela Vista, Rio Claro, SP, CEP-13506-900, Brazil
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Maximal Isokinetic Peak Torque and EMG Activity Determined by Shorter Ranges of Motion. HUMAN MOVEMENT 2012. [DOI: 10.2478/v10038-012-0010-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Molina R, Denadai BS. Dissociated time course recovery between rate of force development and peak torque after eccentric exercise. Clin Physiol Funct Imaging 2011; 32:179-84. [DOI: 10.1111/j.1475-097x.2011.01074.x] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Concurrent EMG feedback acutely improves strength and muscle activation. Eur J Appl Physiol 2011; 112:1899-905. [DOI: 10.1007/s00421-011-2162-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2011] [Accepted: 08/31/2011] [Indexed: 10/17/2022]
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