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Almeida Azevedo R, Keir DA, Forot J, Iannetta D, Millet GY, Murias JM. The effects of exercise intensity and duration on the relationship between the slow component of V̇O 2 and peripheral fatigue. Acta Physiol (Oxf) 2022; 234:e13776. [PMID: 34985184 DOI: 10.1111/apha.13776] [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: 08/04/2021] [Revised: 09/15/2021] [Accepted: 01/01/2022] [Indexed: 11/30/2022]
Abstract
AIM If the development of the oxygen uptake slow component (V̇O2SC ) and muscle fatigue are related, these variables should remain coupled in a time- and intensity-dependent manner. METHODS 16 participants (7 females) visited the laboratory on 7 separate occasions: (1) three 6-minutes moderate-intensity cycling exercise bouts proceeded by a ramp incremental test; (2-3) 30-minutes constant power output (PO) exercise bout to determine the maximal lactate steady state (MLSS); (4-7) constant-PO exercise bouts to task failure (TTF), pseudorandomized order, at (i) 15% below the PO at MLSS; (ii) 10 W below MLSS; (iii) MLSS; (iv) 10 W above MLSS (first intensity and randomized order thereafter). Neuromuscular fatigue was characterized by isometric maximal voluntary contractions and femoral nerve electrical stimulation of knee extensors to measure peripheral fatigue at baseline, at min 5, 10, 20, 30 and TTF. Pulmonary oxygen uptake (V̇O2 ) was continuously recorded during the constant-PO bouts and V̇O2SC was characterized based on each individual V̇O2 kinetics during moderate transitions. RESULTS The development of V̇O2SC and peripheral fatigue were correlated across time (r2 adj range of 0.64-0.80) and amongst each exercise intensity (r2 adj range of 0.26-0.30) (all P < .001). Also, TTF was correlated with V̇O2SC and neuromuscular fatigue parameters (r2 adj range of 0.52-0.82, all P < .001). CONCLUSION The V̇O2SC and peripheral fatigue development are correlated throughout the exercise in a time- and intensity-dependent manner, suggesting that the V̇O2SC may depend on muscle fatigue even if the mechanisms of reduced contractile function are different amongst intensities.
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Affiliation(s)
| | - Daniel A. Keir
- School of Kinesiology The University of Western Ontario London Ontario Canada
- Department of Medicine Toronto General Hospital Research Institute University Health Network Toronto Ontario Canada
| | - Jonas Forot
- Faculty of Kinesiology University of Calgary Calgary Alberta Canada
- The Sport Performance Reserch Group National Ski‐Nordic Center Premanon France
| | - Danilo Iannetta
- Faculty of Kinesiology University of Calgary Calgary Alberta Canada
| | - Guillaume Y. Millet
- Faculty of Kinesiology University of Calgary Calgary Alberta Canada
- Inter‐University Laboratory of Human Movement Biology UJM‐Saint‐Etienne Univ Lyon Saint‐Etienne France
- Institut Universitaire de France (IUF) Paris France
| | - Juan M. Murias
- Faculty of Kinesiology University of Calgary Calgary Alberta Canada
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Froyd C, Beltrami FG, Millet GY, MacIntosh BR, Noakes TD. Greater Short-Time Recovery of Peripheral Fatigue After Short- Compared With Long-Duration Time Trial. Front Physiol 2020; 11:399. [PMID: 32477158 PMCID: PMC7240104 DOI: 10.3389/fphys.2020.00399] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2020] [Accepted: 04/02/2020] [Indexed: 01/24/2023] Open
Abstract
The kinetics of recovery from neuromuscular fatigue resulting from exercise time trials (TTs) of different durations are not well-known. The aim of this study was to determine if TTs of three different durations would result in different short-term recovery in maximal voluntary contraction (MVC) and evoked peak forces. Twelve trained subjects performed repetitive concentric right knee extensions on an isokinetic dynamometer self-paced to last 3, 10, and 40 min (TTs). Neuromuscular function was assessed immediately (<2 s) and 1, 2, 4, and 8 min after completion of each TT using MVCs and electrical stimulation. Electrical stimulations consisted of single stimulus (SS), paired stimuli at 10 Hz (PS10), and paired stimuli at 100 Hz (PS100). Electrically evoked forces including the ratio of low- to high-frequency doublets were similar between trials at exercise cessation but subsequently increased more (P < 0.05) after the 3 min TT compared with either the 10 or 40 min TT when measured at 1 or 2 min of recovery. MVC force was not different between trials. The results demonstrate that recovery of peripheral fatigue including low-frequency fatigue depends on the duration and intensity of the preceding self-paced exercise. These differences in recovery probably indicate differences in the mechanisms of fatigue for these different TTs. Because recovery is faster after a 3 min TT than a 40 min TT, delayed assessment of fatigue will detect a difference in peripheral fatigue between trials that was not present at exercise cessation.
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Affiliation(s)
- Christian Froyd
- Faculty of Education, Arts and Sport, Western Norway University of Applied Sciences, Bergen, Norway.,Division of Exercise Science and Sports Medicine, Department of Human Biology, University of Cape Town, Cape Town, South Africa
| | - Fernando G Beltrami
- Exercise Physiology Lab, Institute of Human Movement Sciences and Sport, ETH Zurich, Zurich, Switzerland
| | - Guillaume Y Millet
- Laboratoire Interuniversitaire de Biologie de la Motricité, University of Lyon, UJM Saint-Etienne, Saint Etienne, France
| | - Brian R MacIntosh
- Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, Calgary, AB, Canada
| | - Timothy D Noakes
- Division of Exercise Science and Sports Medicine, Department of Human Biology, University of Cape Town, Cape Town, South Africa
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Laghi F, Khan N, Schnell T, Aleksonis D, Hammond K, Shaikh H, Collins E, Jubran A, Tobin MJ. New device for nonvolitional evaluation of quadriceps force in ventilated patients. Muscle Nerve 2017; 57:784-791. [PMID: 29194689 DOI: 10.1002/mus.26026] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2017] [Revised: 11/16/2017] [Accepted: 11/26/2017] [Indexed: 12/31/2022]
Abstract
INTRODUCTION In mechanically ventilated patients, nonvolitional assessment of quadriceps weakness using femoral-nerve stimulation (twitch force) while the leg rests on a right-angle trapezoid or dangles from the bed edge is impractical. Accordingly, we developed a knee-support apparatus for use in ventilated patients. METHODS Ninety subjects (12 ventilated patients, 28 ambulatory patients, and 50 healthy subjects) were enrolled. Twitches with leg-dangling, trapezoid, and knee-support setups were compared. RESULTS Knee-support twitches were similar to trapezoid twitches but smaller than leg-dangling twitches (P < 0.0001). Inter- and intraoperator agreement was high for knee-support twitches at 1 week and 1 month. In ventilated patients, knee-support twitches were smaller than in healthy subjects and ambulatory patients (P < 0.004). DISCUSSION The new knee-support apparatus allows accurate recording of quadriceps twitches. The ease of use in ventilated patients and excellent inter- and intraoperator agreement suggest that this technique is suitable for cross-sectional and longitudinal studies in critically ill patients. Muscle Nerve 57: 784-791, 2018.
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Affiliation(s)
- Franco Laghi
- Section of Pulmonary Diseases and Critical Care Medicine, Division of Internal Medicine, Edward Hines Jr. Veterans Affairs Hospital (111N), Fifth Avenue and Roosevelt Road, Hines, Illinois, 60141, USA.,Division of Pulmonary Diseases and Critical Care Medicine, Department of Internal Medicine, Loyola University of Chicago Stritch School of Medicine, Maywood, Illinois, USA
| | - Najeeb Khan
- Section of Pulmonary Diseases and Critical Care Medicine, Division of Internal Medicine, Edward Hines Jr. Veterans Affairs Hospital (111N), Fifth Avenue and Roosevelt Road, Hines, Illinois, 60141, USA
| | - Thimothy Schnell
- Section of Pulmonary Diseases and Critical Care Medicine, Division of Internal Medicine, Edward Hines Jr. Veterans Affairs Hospital (111N), Fifth Avenue and Roosevelt Road, Hines, Illinois, 60141, USA.,Division of Pulmonary Diseases and Critical Care Medicine, Department of Internal Medicine, Loyola University of Chicago Stritch School of Medicine, Maywood, Illinois, USA
| | - Dinas Aleksonis
- Section of Pulmonary Diseases and Critical Care Medicine, Division of Internal Medicine, Edward Hines Jr. Veterans Affairs Hospital (111N), Fifth Avenue and Roosevelt Road, Hines, Illinois, 60141, USA.,Division of Pulmonary Diseases and Critical Care Medicine, Department of Internal Medicine, Loyola University of Chicago Stritch School of Medicine, Maywood, Illinois, USA
| | - Kendra Hammond
- Division of Pulmonary, Critical Care & Sleep Medicine, Department of Medicine, National Jewish Health, Denver, Colorado, USA
| | - Hameeda Shaikh
- Section of Pulmonary Diseases and Critical Care Medicine, Division of Internal Medicine, Edward Hines Jr. Veterans Affairs Hospital (111N), Fifth Avenue and Roosevelt Road, Hines, Illinois, 60141, USA.,Division of Pulmonary Diseases and Critical Care Medicine, Department of Internal Medicine, Loyola University of Chicago Stritch School of Medicine, Maywood, Illinois, USA
| | - Eileen Collins
- Section of Pulmonary Diseases and Critical Care Medicine, Division of Internal Medicine, Edward Hines Jr. Veterans Affairs Hospital (111N), Fifth Avenue and Roosevelt Road, Hines, Illinois, 60141, USA
| | - Amal Jubran
- Section of Pulmonary Diseases and Critical Care Medicine, Division of Internal Medicine, Edward Hines Jr. Veterans Affairs Hospital (111N), Fifth Avenue and Roosevelt Road, Hines, Illinois, 60141, USA.,Division of Pulmonary Diseases and Critical Care Medicine, Department of Internal Medicine, Loyola University of Chicago Stritch School of Medicine, Maywood, Illinois, USA
| | - Martin J Tobin
- Section of Pulmonary Diseases and Critical Care Medicine, Division of Internal Medicine, Edward Hines Jr. Veterans Affairs Hospital (111N), Fifth Avenue and Roosevelt Road, Hines, Illinois, 60141, USA.,Division of Pulmonary Diseases and Critical Care Medicine, Department of Internal Medicine, Loyola University of Chicago Stritch School of Medicine, Maywood, Illinois, USA
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Doguet V, Nosaka K, Plautard M, Gross R, Guilhem G, Guével A, Jubeau M. Neuromuscular Changes and Damage after Isoload versus Isokinetic Eccentric Exercise. Med Sci Sports Exerc 2017; 48:2526-2535. [PMID: 27434079 DOI: 10.1249/mss.0000000000001042] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
PURPOSE This study compared the effects of isoload (IL) and isokinetic (IK) knee extensor eccentric exercises on changes in muscle damage and neuromuscular parameters to test the hypothesis that the changes would be different after IL and IK exercises. METHODS Twenty-two young men were paired based on their strength and placed in the IL (N = 11) or the IK (N = 11) group. The IL group performed 15 sets of 10 eccentric contractions with a 150% of predetermined one-repetition maximum load. The IK group performed 15 sets of several maximal eccentric contractions matched set by set for the total amount of work and mean angular velocity with the IL group. Muscle damage markers (voluntary isometric peak torque, muscle soreness, and creatine kinase activity) and neuromuscular variables (e.g., voluntary activation, H-reflex, M-wave, and evoked torque) were measured before, immediately after, and 24, 48, 72, and 96 h postexercise. RESULTS Voluntary isometric peak torque decreased to the same extent (P = 0.94) in both groups immediately after (IL = -40.6% ± 13.8% vs IK = -42.4% ± 10.2%) to 96 h after the exercise (IL = -21.8% ± 28.5% vs IK = -26.7% ± 23.5%). Neither peak muscle soreness (IL = 48.1 ± 28.2 mm vs IK = 54.7 ± 28.9 mm, P = 0.57) nor creatine kinase activity (IL = 12,811 ± 22,654 U·L vs IK = 15,304 ± 24,739 U·L, P = 0.59) significantly differed between groups. H-reflex (IL = -23% vs IK = -35%) and M-wave (IL = -10% vs IK = -17%) significantly decreased immediately postexercise similarly between groups. CONCLUSION The changes in muscle damage and neuromuscular function after the exercise are similar between IL and IK, suggesting that resistance modality has little effects on acute muscle responses.
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Affiliation(s)
- Valentin Doguet
- 1Laboratory "Movement, Interactions, Performance" (EA 4334), Faculty of Sport Sciences, University of Nantes, Nantes, FRANCE; 2Centre for Exercise and Sports Science Research, School of Medical and Health Sciences, Edith Cowan University, Joondalup, WA, AUSTRALIA; 3Department of Physical Medicine and Rehabilitation, Nantes University Hospital, Saint-Jacques Hospital, Nantes, FRANCE; and 4French Institute of Sport (INSEP), Research Department, Laboratory Sport, Expertise and Performance (EA 7370), Paris, FRANCE
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Froyd C, Beltrami FG, Millet GY, Noakes TD. No Critical Peripheral Fatigue Threshold during Intermittent Isometric Time to Task Failure Test with the Knee Extensors. Front Physiol 2017; 7:627. [PMID: 28066260 PMCID: PMC5165016 DOI: 10.3389/fphys.2016.00627] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2016] [Accepted: 12/01/2016] [Indexed: 11/13/2022] Open
Abstract
It has been proposed that group III and IV muscle afferents provide inhibitory feedback from locomotor muscles to the central nervous system, setting an absolute threshold for the development of peripheral fatigue during exercise. The aim of this study was to test the validity of this theory. Thus, we asked whether the level of developed peripheral fatigue would differ when two consecutive exercise trials were completed to task failure. Ten trained sport students performed two exercise trials to task failure on an isometric dynamometer, allowing peripheral fatigue to be assessed 2 s after maximal voluntary contraction (MVC) post task failure. The trials, separated by 8 min, consisted of repeated sets of 10 × 5-s isometric knee extension followed by 5-s rest between contractions. In each set, the first nine contractions were performed at a target force at 60% of the pre-exercise MVC, while the 10th contraction was a MVC. MVC and evoked force responses to supramaximal electrical femoral nerve stimulation on relaxed muscles were assessed during the trials and at task failure. Stimulations at task failure consisted of single stimulus (SS), paired stimuli at 10 Hz (PS10), paired stimuli at 100 Hz (PS100), and 50 stimuli at 100 Hz (tetanus). Time to task failure for the first trial (12.84 ± 5.60 min) was longer (P < 0.001) than for the second (5.74 ± 1.77 min). MVC force was significantly lower at task failure for both trials compared with the pre-exercise values (both P < 0.001), but there were no differences in MVC at task failure in the first and second trials (P = 1.00). However, evoked peak force for SS, PS100, and tetanus were all reduced more at task failure in the second compared to the first trial (P = 0.014 for SS, P < 0.001 for PS100 and tetanus). These results demonstrate that subjects do not terminate exercise at task failure because they have reached a critical threshold in peripheral fatigue. The present data therefore question the existence of a critical peripheral fatigue threshold during intermittent isometric exercise to task failure with the knee extensors.
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Affiliation(s)
- Christian Froyd
- Faculty of Teacher Education and Sport, Sogn og Fjordane University CollegeSogndal, Norway; Department of Human Biology, University of Cape TownCape Town, South Africa
| | - Fernando G Beltrami
- Exercise Physiology Lab, Department of Health Sciences and Technology ETH Zurich, Zürich, Switzerland
| | - Guillaume Y Millet
- Human Performance Laboratory, Faculty of Kinesiology, University of Calgary Calgary, AB, Canada
| | - Timothy D Noakes
- Department of Human Biology, University of Cape Town Cape Town, South Africa
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FROYD CHRISTIAN, BELTRAMI FERNANDOGABE, MILLET GUILLAUMEY, NOAKES TIMOTHYD. Central Regulation and Neuromuscular Fatigue during Exercise of Different Durations. Med Sci Sports Exerc 2016; 48:1024-32. [DOI: 10.1249/mss.0000000000000867] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Del Rosso S, Barros E, Tonello L, Oliveira-Silva I, Behm DG, Foster C, Boullosa DA. Can Pacing Be Regulated by Post-Activation Potentiation? Insights from a Self-Paced 30 km Trial in Half-Marathon Runners. PLoS One 2016; 11:e0150679. [PMID: 26934357 PMCID: PMC4774955 DOI: 10.1371/journal.pone.0150679] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2015] [Accepted: 02/16/2016] [Indexed: 11/18/2022] Open
Abstract
Purpose Given the co-existence of post-activation potentiation (PAP) and fatigue within muscle, it is not known whether PAP could influence performance and pacing during distance running by moderating fatigue. The aim of this study was to assess the influence of PAP on pacing, jumping and other physiological measures during a self-paced 30 km trial. Methods Eleven male endurance-trained runners (half-marathon runners) volunteered to participate in this study. Runners participated in a multi-stage 30 km trial. Before the trial started, determination of baseline blood lactate (bLa) and countermovement jump (CMJ) height was performed. The self-paced 30 km trial consisted of 6 × 5 km splits. At the end of each 5 km split (60 s break), data on time to complete the split, CMJ height, Rating of Perceived Exertion (RPE) and blood lactate were collected while heart rate was continuously monitored. Results There was a significant decrease in speed (e.g. positive pacing strategy after the 4th split, p<0.05) with a progressive increase in RPE throughout the trial. Compared with baseline, CMJ height was significantly (p<0.05) greater than baseline and was maintained until the end of the trial with an increase after the 5th split, concomitant with a significant reduction in speed and an increase in RPE. Significant correlations were found between ΔCMJ and ΔSPEED (r = 0.77 to 0.87, p<0.05) at different time points as well as between RPE and speed (r = -0.61 to -0.82, p<0.05). Conclusion Our results indicates that fatigue and potentiation co-exist during long lasting endurance events, and that the observed increase in jump performance towards the end of the trial could be reflecting a greater potentiation potentially perhaps counteracting the effects of fatigue and preventing further reductions in speed.
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Affiliation(s)
- Sebastián Del Rosso
- Grupo de Investigación en Estilos de Vida y Estrés Oxidativo, CenIHN - Escuela de Nutrición, DAAN, Hospital Nacional de Clínicas, Facultad de Cs. Médicas, Universidad Nacional de Córdoba, Córdoba, Argentina
- Pós-Graduação Stricto Sensu em Educação Física, Universidade Católica de Brasília, Águas Claras, Brazil
| | - Edilberto Barros
- Pós-Graduação Stricto Sensu em Educação Física, Universidade Católica de Brasília, Águas Claras, Brazil
| | - Laís Tonello
- Pós-Graduação Stricto Sensu em Educação Física, Universidade Católica de Brasília, Águas Claras, Brazil
| | - Iransé Oliveira-Silva
- Pós-Graduação Stricto Sensu em Educação Física, Universidade Católica de Brasília, Águas Claras, Brazil
| | - David G. Behm
- School of Human Kinetics and Recreation, Memorial University of Newfoundland, St. John's, Newfoundland, Canada
| | - Carl Foster
- Department of Exercise and Sport Science, University of Wisconsin, La Crosse, Wisconsin, United States of America
| | - Daniel A. Boullosa
- Pós-Graduação Stricto Sensu em Educação Física, Universidade Católica de Brasília, Águas Claras, Brazil
- * E-mail:
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