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Boulay C, Gracies JM, Garcia L, Authier G, Ulian A, Pradines M, Vieira TM, Pinto T, Gazzoni M, Desnous B, Parratte B, Pesenti S. Serious Game with Electromyography Feedback and Physical Therapy in Young Children with Unilateral Spastic Cerebral Palsy and Equinus Gait: A Prospective Open-Label Study. SENSORS (BASEL, SWITZERLAND) 2024; 24:1513. [PMID: 38475049 DOI: 10.3390/s24051513] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2023] [Revised: 02/01/2024] [Accepted: 02/21/2024] [Indexed: 03/14/2024]
Abstract
The clinical effects of a serious game with electromyography feedback (EMGs_SG) and physical therapy (PT) was investigated prospectively in children with unilateral spastic cerebral palsy (USCP). An additional aim was to better understand the influence of muscle shortening on function. Thirty children with USCP (age 7.6 ± 2.1 years) received four weeks of EMGs_SG sessions 2×/week including repetitive, active alternating training of dorsi- and plantar flexors in a seated position. In addition, each child received usual PT treatment ≤ 2×/week, involving plantar flexor stretching and command strengthening on dorsi- and plantar flexors. Five-Step Assessment parameters, including preferred gait velocity (normalized by height); plantar flexor extensibility (XV1); angle of catch (XV3); maximal active ankle dorsiflexion (XA); and derived coefficients of shortening, spasticity, and weakness for both soleus and gastrosoleus complex (GSC) were compared pre and post treatment (t-tests). Correlations were explored between the various coefficients and gait velocities at baseline. After four weeks of EMGs_SG + PT, there was an increase in normalized gait velocity from 0.72 ± 0.13 to 0.77 ± 0.13 m/s (p = 0.025, d = 0.43), a decrease in coefficients of shortening (soleus, 0.10 ± 0.07 pre vs. 0.07 ± 0.08 post, p = 0.004, d = 0.57; GSC 0.16 ± 0.08 vs. 0.13 ± 0.08, p = 0.003, d = 0.58), spasticity (soleus 0.14 ± 0.06 vs. 0.12 ± 0.07, p = 0.02, d = 0.46), and weakness (soleus 0.14 ± 0.07 vs. 0.11 ± 0.07, p = 0.005, d = 0.55). At baseline, normalized gait velocity correlated with the coefficient of GSC shortening (R = -0.43, p = 0.02). Four weeks of EMGs_SG and PT were associated with improved gait velocity and decreased plantar flexor shortening. A randomized controlled trial comparing EMGs_SG and conventional PT is needed.
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Affiliation(s)
- Christophe Boulay
- Gait Laboratory, Pediatric Orthopaedic Surgery Department, Timone Children Hospital, 13385 Marseille, France
- Aix-Marseille University, CNRS, ISM UMR 7287, 13284 Marseille, France
| | - Jean-Michel Gracies
- AP-HP, Service de Rééducation Neurolocomotrice, Unité de Neurorééducation, Hôpitaux Universitaires Henri Mondor, F-94010 Créteil, France
- UR 7377 BIOTN, Laboratoire Analyse et Restauration du Mouvement, Université Paris Est Créteil (UPEC), F-94000 Créteil, France
| | - Lauren Garcia
- Gait Laboratory, Pediatric Orthopaedic Surgery Department, Timone Children Hospital, 13385 Marseille, France
- Aix-Marseille University, CNRS, ISM UMR 7287, 13284 Marseille, France
| | - Guillaume Authier
- Gait Laboratory, Pediatric Orthopaedic Surgery Department, Timone Children Hospital, 13385 Marseille, France
- Aix-Marseille University, CNRS, ISM UMR 7287, 13284 Marseille, France
| | - Alexis Ulian
- Gait Laboratory, Pediatric Orthopaedic Surgery Department, Timone Children Hospital, 13385 Marseille, France
- Aix-Marseille University, CNRS, ISM UMR 7287, 13284 Marseille, France
| | - Maud Pradines
- AP-HP, Service de Rééducation Neurolocomotrice, Unité de Neurorééducation, Hôpitaux Universitaires Henri Mondor, F-94010 Créteil, France
- UR 7377 BIOTN, Laboratoire Analyse et Restauration du Mouvement, Université Paris Est Créteil (UPEC), F-94000 Créteil, France
| | - Taian Martins Vieira
- Laboratory for Engineering of the Neuromuscular System (LISiN), Department of Electronics and Telecommunication, Politecnico di Torino, 10129 Turin, Italy
- PoliToBIOMed Laboratory, Department of Electronics and Telecommunications, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Turin, Italy
| | - Talita Pinto
- UR 7377 BIOTN, Laboratoire Analyse et Restauration du Mouvement, Université Paris Est Créteil (UPEC), F-94000 Créteil, France
- Instituto D'Or de Pesquisa e Ensino (IDOR), Rio de Janeiro 22281-100, Brazil
| | - Marco Gazzoni
- Laboratory for Engineering of the Neuromuscular System (LISiN), Department of Electronics and Telecommunication, Politecnico di Torino, 10129 Turin, Italy
- PoliToBIOMed Laboratory, Department of Electronics and Telecommunications, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Turin, Italy
| | - Béatrice Desnous
- Pediatric Neurology Department, Timone Children Hospital, 13005 Marseille, France
| | - Bernard Parratte
- Gait Laboratory, Pediatric Orthopaedic Surgery Department, Timone Children Hospital, 13385 Marseille, France
| | - Sébastien Pesenti
- Gait Laboratory, Pediatric Orthopaedic Surgery Department, Timone Children Hospital, 13385 Marseille, France
- Aix-Marseille University, CNRS, ISM UMR 7287, 13284 Marseille, France
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Grimandi R, Tissier F, Andro C, Tardy D, Gunepin FX, Rannou F, Giroux-Metges MA. The hamstrings are more impacted than the quadriceps after severe ankle sprain. Medicine (Baltimore) 2022; 101:e30251. [PMID: 36123917 PMCID: PMC9478271 DOI: 10.1097/md.0000000000030251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
Ankle sprains (AS) are common in the military population, with a prevalence 5 to 8 times higher than that for civilians. The aim of this study was to evaluate in patients with severe AS the impact of disuse on thigh muscle induced by unloading and immobilization due to care. This study focused on muscle trophicity and dynamometric strength. In this observational prospective study, assessments were repeated at 3 visits: close to injury, 15 and 30 days following the sprain. The injured limb was compared to the contralateral limb. A dynamometer assessment was used to monitor changes in strength and fatigue of the thigh muscles of both limbs. Isometric and isokinetic concentric evaluation of peak torque (PTiso and PTdyn), total work (Wt), and peak torque time integral (IPT) of thigh muscles. Full follow-up was obtained in 30 subjects. The injured limbs showed significant deficits in the mean (SD). The quadriceps PTiso and IPT deficits were -12.6% ± 1.9% (P < .0001) and -13.27% ± 1.8% (P < .0001), respectively. The quadriceps PTdyn showed a significant deficit since V2 (-12.2.5% ± 2.0). The quadriceps Wt presented a significant deficit of -4.2% ± 2.4 (P < .0007) at 1 month. The hamstring PTdyn deficit presented a mean loss of -16.5% ± 2.4% (P < .0001). The hamstring Wt deficit was -13.7% ± 2.3% (P < .001). The analysis of variance showed that the grade of the sprain had a significant effect on the quadriceps PTq deficit (P < .016) but not the type of discharge. Our study showed that disuse leads to a significant deficit in the strength of knee muscles within 1 month. It is noteworthy that the hamstrings are more affected than the quadriceps. The rehabilitation protocol to prevent the risk of iterative ankle injuries and secondary knee injuries should incorporate early training of both quadriceps and hamstrings.
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Affiliation(s)
- Ronan Grimandi
- ORPHY, EA4324, University of Brest, Brest, France
- Médecine Physique et Réhabilitation, Hôpital d’Instruction des Armées Clermont-Tonnerre (HIA-CT), Brest, France
- *Correspondence: Ronan Grimandi, MSc, BPT. (e-mail: )
| | - Florine Tissier
- ORPHY, EA4324, University of Brest, Brest, France
- Explorations Fonctionnelles Respiratoires, Hôpital de La Cavale Blanche, CHRU DE Brest, Brest, France
| | - Christophe Andro
- Service de Chirurgie Orthopédie, Hôpital d’Instruction des Armées Clermont-Tonnerre (HIA-CT), Brest, France
| | - Dominique Tardy
- Médecine Physique et Réhabilitation, Hôpital d’Instruction des Armées Clermont-Tonnerre (HIA-CT), Brest, France
| | - François-Xavier Gunepin
- Clinique Mutualiste de la Porte de l’Orient, 3 rue Robert de La Croix, Lorient cedex, France
| | - Fabrice Rannou
- Médecine du Sport et Explorations Fonctionnelles-ASMS (UNH), Hôpital Gabriel Montpied, CHU Clermont-Ferrand, France
| | - Marie-Agnès Giroux-Metges
- ORPHY, EA4324, University of Brest, Brest, France
- Explorations Fonctionnelles Respiratoires, Hôpital de La Cavale Blanche, CHRU DE Brest, Brest, France
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Pradines M, Ghédira M, Bignami B, Vielotte J, Bayle N, Marciniak C, Burke D, Hutin E, Gracies JM. Do Muscle Changes Contribute to the Neurological Disorder in Spastic Paresis? Front Neurol 2022; 13:817229. [PMID: 35370894 PMCID: PMC8964436 DOI: 10.3389/fneur.2022.817229] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2021] [Accepted: 02/01/2022] [Indexed: 11/13/2022] Open
Abstract
Background At the onset of stroke-induced hemiparesis, muscle tissue is normal and motoneurones are not overactive. Muscle contracture and motoneuronal overactivity then develop. Motor command impairments are classically attributed to the neurological lesion, but the role played by muscle changes has not been investigated. Methods Interaction between muscle and command disorders was explored using quantified clinical methodology-the Five Step Assessment. Six key muscles of each of the lower and upper limbs in adults with chronic poststroke hemiparesis were examined by a single investigator, measuring the angle of arrest with slow muscle stretch (XV1) and the maximal active range of motion against the resistance of the tested muscle (XA). The coefficient of shortening CSH = (XN-XV1)/XN (XN, normally expected amplitude) and of weakness CW = (XV1-XA)/XV1) were calculated to estimate the muscle and command disorders, respectively. Composite CSH (CCSH) and CW (CCW) were then derived for each limb by averaging the six corresponding coefficients. For the shortened muscles of each limb (mean CSH > 0.10), linear regressions explored the relationships between coefficients of shortening and weakness below and above their median coefficient of shortening. Results A total of 80 persons with chronic hemiparesis with complete lower limb assessments [27 women, mean age 47 (SD 17), time since lesion 8.8 (7.2) years], and 32 with upper limb assessments [18 women, age 32 (15), time since lesion 6.4 (9.3) years] were identified. The composite coefficient of shortening was greater in the lower than in the upper limb (0.12 ± 0.04 vs. 0.08 ± 0.04; p = 0.0002, while the composite coefficient of weakness was greater in the upper limb (0.28 ± 0.12 vs. 0.15 ± 0.06, lower limb; p < 0.0001). In the lower limb shortened muscles, the coefficient of weakness correlated with the composite coefficient of shortening above the 0.15 median CSH (R = 0.43, p = 0.004) but not below (R = 0.14, p = 0.40). Conclusion In chronic hemiparesis, muscle shortening affects the lower limb particularly, and, beyond a threshold of severity, may alter descending commands. The latter might occur through chronically increased intramuscular tension, and thereby increased muscle afferent firing and activity-dependent synaptic sensitization at the spinal level.
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Affiliation(s)
- Maud Pradines
- UR 7377 BIOTN, Laboratoire Analyse et Restauration du Mouvement, Université Paris Est Créteil (UPEC), Créteil, France
- AP-HP, Service de Rééducation Neurolocomotrice, Unité de Neurorééducation, Hôpitaux Universitaires Henri Mondor, Créteil, France
| | - Mouna Ghédira
- UR 7377 BIOTN, Laboratoire Analyse et Restauration du Mouvement, Université Paris Est Créteil (UPEC), Créteil, France
- AP-HP, Service de Rééducation Neurolocomotrice, Unité de Neurorééducation, Hôpitaux Universitaires Henri Mondor, Créteil, France
| | - Blaise Bignami
- AP-HP, Service de Rééducation Neurolocomotrice, Unité de Neurorééducation, Hôpitaux Universitaires Henri Mondor, Créteil, France
| | - Jordan Vielotte
- AP-HP, Service de Rééducation Neurolocomotrice, Unité de Neurorééducation, Hôpitaux Universitaires Henri Mondor, Créteil, France
| | - Nicolas Bayle
- UR 7377 BIOTN, Laboratoire Analyse et Restauration du Mouvement, Université Paris Est Créteil (UPEC), Créteil, France
- AP-HP, Service de Rééducation Neurolocomotrice, Unité de Neurorééducation, Hôpitaux Universitaires Henri Mondor, Créteil, France
| | - Christina Marciniak
- Department of Physical Medicine and Rehabilitation, Northwestern University and the Shirley Ryan AbilityLab, Chicago, IL, United States
- Department of Neurology, Northwestern University and the Shirley Ryan AbilityLab, Chicago, IL, United States
| | - David Burke
- Department of Neurology, Royal Prince Alfred Hospital and the University of Sydney, Sydney, NSW, Australia
| | - Emilie Hutin
- UR 7377 BIOTN, Laboratoire Analyse et Restauration du Mouvement, Université Paris Est Créteil (UPEC), Créteil, France
- AP-HP, Service de Rééducation Neurolocomotrice, Unité de Neurorééducation, Hôpitaux Universitaires Henri Mondor, Créteil, France
| | - Jean-Michel Gracies
- UR 7377 BIOTN, Laboratoire Analyse et Restauration du Mouvement, Université Paris Est Créteil (UPEC), Créteil, France
- AP-HP, Service de Rééducation Neurolocomotrice, Unité de Neurorééducation, Hôpitaux Universitaires Henri Mondor, Créteil, France
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Speacht TL, Krause AR, Steiner JL, Lang CH, Donahue HJ. Combination of hindlimb suspension and immobilization by casting exaggerates sarcopenia by stimulating autophagy but does not worsen osteopenia. Bone 2018; 110:29-37. [PMID: 29414598 DOI: 10.1016/j.bone.2018.01.026] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/09/2017] [Revised: 01/14/2018] [Accepted: 01/20/2018] [Indexed: 12/20/2022]
Abstract
Astronauts in space experience a unique environment that causes the concomitant loss of bone and muscle. However, the interaction between these tissues and how osteopenia and sarcopenia affect each other is unclear. We explored this relationship by exaggerating unloading-induced muscle loss using a unilateral casting model in conjunction with hindlimb suspension (HLS). Five-month-old, male C57Bl/6J mice subjected to HLS for 2 weeks displayed a significant decrease in gastrocnemius and quadriceps weight (-9-10%), with a two-fold greater decrease in muscle mass observed in the HLS + casted limb. However, muscle from casted limbs had a higher rate of protein synthesis (+16%), compared to HLS alone, with coordinated increases in S6K1 (+50%) and 4E-BP1 (+110%) phosphorylation. Increased protein content for surrogate markers of autophagy, including LC3-II (+75%), Atg7 (+10%), and Atg5-12 complex (+20%) was only detected in muscle from the casted limb. In proximal tibias, HLS resulted in significant decreases in bone volume fraction (-24% vs -8%), trabecular number (-6% vs +0.3%), trabecular thickness (-10% vs -2%), and trabecular spacing (+8.4% vs +2%) compared to ground controls. There was no further bone loss in casted limbs compared to HLS alone. In tibia midshafts, HLS resulted in decreased total area (-2% vs +1%) and increased bone mineral density (+1% vs -0.3%) compared to ground controls. Cortical bone from casted limbs showed an increase in cortical thickness (+9% vs +2%) and cortical area/total area (+1% vs -0.6%) compared to HLS alone. Our results suggest that casting exacerbates unloading-induced muscle loss via activation of autophagy. Casting did not exacerbate bone loss suggesting that the unloading-induced loss of muscle and bone can be temporally dissociated and the effect of reduced muscle activity plays a relatively minor role compared to reduced load bearing on trabecular bone structure.
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Affiliation(s)
- Toni L Speacht
- Department of Orthopaedics and Rehabilitation, The Pennsylvania State University, College of Medicine, Hershey, PA 17033, United States
| | - Andrew R Krause
- Department of Orthopaedics and Rehabilitation, The Pennsylvania State University, College of Medicine, Hershey, PA 17033, United States
| | - Jennifer L Steiner
- Department of Cellular and Molecular Physiology, The Pennsylvania State University, College of Medicine, Hershey, PA 17033, United States
| | - Charles H Lang
- Department of Cellular and Molecular Physiology, The Pennsylvania State University, College of Medicine, Hershey, PA 17033, United States
| | - Henry J Donahue
- Department of Orthopaedics and Rehabilitation, The Pennsylvania State University, College of Medicine, Hershey, PA 17033, United States; Department of Biomedical Engineering, Virginia Commonwealth University, Richmond, VA, United States.
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Derbré F, Droguet M, Léon K, Troadec S, Pennec JP, Giroux-Metges MA, Rannou F. Single Muscle Immobilization Decreases Single-Fibre Myosin Heavy Chain Polymorphism: Possible Involvement of p38 and JNK MAP Kinases. PLoS One 2016; 11:e0158630. [PMID: 27383612 PMCID: PMC4934689 DOI: 10.1371/journal.pone.0158630] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2016] [Accepted: 06/20/2016] [Indexed: 11/29/2022] Open
Abstract
PURPOSE Muscle contractile phenotype is affected during immobilization. Myosin heavy chain (MHC) isoforms are the major determinant of the muscle contractile phenotype. We therefore sought to evaluate the effects of muscle immobilization on both the MHC composition at single-fibre level and the mitogen-activated protein kinases (MAPK), a family of intracellular signaling pathways involved in the stress-induced muscle plasticity. METHODS The distal tendon of female Wistar rat Peroneus Longus (PL) was cut and fixed to the adjacent bone at neutral muscle length. Four weeks after the surgery, immobilized and contralateral PL were dissociated and the isolated fibres were sampled to determine MHC composition. Protein kinase 38 (p38), extracellular signal-regulated kinases (ERK1/2), and c-Jun- NH2-terminal kinase (JNK) phosphorylations were measured in 6- and 15-day immobilized and contralateral PL. RESULTS MHC distribution in immobilized PL was as follows: I = 0%, IIa = 11.8 ± 2.8%, IIx = 53.0 ± 6.1%, IIb = 35.3 ± 7.3% and I = 6.1 ± 3.9%, IIa = 22.1 ± 3.4%, IIx = 46.6 ± 4.5%, IIb = 25.2 ± 6.6% in contralateral muscle. The MHC composition in immobilized muscle is consistent with a faster contractile phenotype according to the Hill's model of the force-velocity relationship. Immobilized and contralateral muscles displayed a polymorphism index of 31.1% (95% CI 26.1-36.0) and 39.3% (95% CI 37.0-41.5), respectively. Significant increases in p38 and JNK phosphorylation were observed following 6 and 15 days of immobilization. CONCLUSIONS Single muscle immobilization at neutral length induces a shift of MHC composition toward a faster contractile phenotype and decreases the polymorphic profile of single fibres. Activation of p38 and JNK could be a potential mechanism involved in these contractile phenotype modifications during muscle immobilization.
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Affiliation(s)
- Frédéric Derbré
- Laboratory “Movement Sport and health Sciences”(M2S) -EA1274, University Rennes 2-ENS Rennes, Rennes, France
| | - Mickaël Droguet
- Physiology Department-EA1274 M2S, School of Medicine, Brest, France
| | - Karelle Léon
- Physiology Department-EA1274 M2S, School of Medicine, Brest, France
| | - Samuel Troadec
- Physiology Department-EA1274 M2S, School of Medicine, Brest, France
| | | | | | - Fabrice Rannou
- Physiology Department-EA1274 M2S, School of Medicine, Brest, France
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Van Dyke JM, Bain JL, Riley DA. Stretch-activated signaling is modulated by stretch magnitude and contraction. Muscle Nerve 2013; 49:98-107. [DOI: 10.1002/mus.23880] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/10/2013] [Indexed: 11/08/2022]
Affiliation(s)
- Jonathan M. Van Dyke
- Department of Cell Biology; Neurobiology & Anatomy, Medical College of Wisconsin; 8701 Watertown Plank Road Milwaukee Wisconsin 53226 USA
| | - James L.W. Bain
- Department of Cell Biology; Neurobiology & Anatomy, Medical College of Wisconsin; 8701 Watertown Plank Road Milwaukee Wisconsin 53226 USA
| | - Danny A. Riley
- Department of Cell Biology; Neurobiology & Anatomy, Medical College of Wisconsin; 8701 Watertown Plank Road Milwaukee Wisconsin 53226 USA
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Rannou F, Leschiera R, Giroux-Metges MA, Pennec JP. Effects of lactate on the voltage-gated sodium channels of rat skeletal muscle: modulating current opinion. J Appl Physiol (1985) 2012; 112:1454-65. [DOI: 10.1152/japplphysiol.00944.2011] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
During muscle contraction, lactate production and translocation across the membrane increase. While it has recently been shown that lactate anion acts on chloride channel, less is known regarding a potential effect on the voltage-gated sodium channel (Nav) of skeletal muscle. The electrophysiological properties of muscle Nav were studied in the absence and presence of lactate (10 mM) by using the macropatch-clamp method in dissociated fibers from rat peroneus longus (PL). Lactate in the external medium (petri dish + pipette) increases the maximal sodium current, while the voltage dependence of activation and fast inactivation are shifted toward the hyperpolarized potentials. Lactate induces a leftward shift in the relationship between the kinetic parameters and the imposed potentials, resulting in an earlier recruitment of muscle Nav. In addition, lactate significantly decreases the time constant of activation at voltages more negative than −10 mV, corresponding to an acceleration of Nav activation. The slow inactivation process is decreased by lactate, corresponding to an enhancement in the number of excitable Nav. In an additional series of experiments, lactate (10 mM) was only added to the petri dish, while the pipette remained sealed on the membrane area. With this approach, the electrophysiological properties of Nav were unaffected by lactate compared with the control condition. Altogether, these data indicate that lactate modulates muscle Nav properties by an extracellular pathway. These effects are consistent with an enhancement in excitability, providing new insights into the role of lactate in muscle physiology.
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Affiliation(s)
- F. Rannou
- Université de Brest, Faculté de Médecine et des Sciences de la Santé, EA 1274-M2S, Laboratoire de Physiologie
- CHU Brest, Service d'Explorations Fonctionnelles Respiratoires; and
- Université Européenne de Bretagne, Brest, France
| | - R. Leschiera
- Université de Brest, Faculté de Médecine et des Sciences de la Santé, EA 1274-M2S, Laboratoire de Physiologie
- Université Européenne de Bretagne, Brest, France
| | - M. A. Giroux-Metges
- Université de Brest, Faculté de Médecine et des Sciences de la Santé, EA 1274-M2S, Laboratoire de Physiologie
- CHU Brest, Service d'Explorations Fonctionnelles Respiratoires; and
- Université Européenne de Bretagne, Brest, France
| | - J. P. Pennec
- Université de Brest, Faculté de Médecine et des Sciences de la Santé, EA 1274-M2S, Laboratoire de Physiologie
- Université Européenne de Bretagne, Brest, France
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Abstract
Active stretch is necessary for regulating muscle fiber length (ie, the number of series sarcomeres). Elevated cytoplasmic calcium is the proposed component of contractile activity required to activate signaling pathways for sarcomere number regulation. Passive stretch reduces muscle tissue stiffness, most likely by signaling connective tissue remodeling via fibroblasts. Passive stretch may induce sarcomere addition if the muscle fibers are lengthened sufficiently to raise cytoplasmic calcium through stretch-activated calcium channels. The magnitude of stretch in vivo is limited by the physiologic range of movement and stretch pain tolerance. The greatest effect of stretching muscle fibers is expected when the lengthening exceeds the optimum fiber length (Lo).
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Rannou F, Pennec JP, Morel J, Guéret G, Leschiera R, Droguet M, Gioux M, Giroux-Metges MA. Na v1.4 and Na v1.5 are modulated differently during muscle immobilization and contractile phenotype conversion. J Appl Physiol (1985) 2011; 111:495-507. [PMID: 21596924 DOI: 10.1152/japplphysiol.01136.2010] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Muscle immobilization leads to modification in its fast/slow contractile phenotype. Since the properties of voltage-gated sodium channels (Na(v)) are different between "fast" and "slow" muscles, we studied the effects of immobilization on the contractile properties and the Na(v) of rat peroneus longus (PL). The distal tendon of PL was cut and fixed to the adjacent bone at neutral muscle length. After 4 or 8 wk of immobilization, the contractile and the Na(v) properties were studied and compared with muscles from control animals (Student's t-test). After 4 wk of immobilization, PL showed a faster phenotype with a rightward shift of the force-frequency curve and a decrease in both the Burke's index of fatigability and the tetanus-to-twitch ratio. These parameters showed opposite changes between 4 and 8 wk of immobilization. The maximal sodium current in 4-wk immobilized fibers was higher compared with that of control fibers (11.5 ± 1.2 vs. 7.8 ± 0.8 nA, P = 0.008), with partial recovery to the control values in 8-wk immobilized fibers (8.6 ± 0.7 nA, P = 0.48). In the presence of tetrodotoxin, the maximal residual sodium current decreased continuously throughout immobilization. Using the Western blot analysis, Na(v)1.4 expression showed a transient increase in 4-wk muscle, whereas Na(v)1.5 expression decreased during immobilization. Our results indicate that a muscle immobilized at optimal functional length with the preservation of neural inputs exhibits a transient fast phenotype conversion. Na(v)1.4 expression and current are related to the contractile phenotype variation.
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Affiliation(s)
- Fabrice Rannou
- Université de Brest, Faculté de Médecine et des Sciences de la Santé, EA 4326, Laboratoire de Physiologie, Brest, France
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Sabatier MJ, To BN, Nicolini J, English AW. Effect of axon misdirection on recovery of electromyographic activity and kinematics after peripheral nerve injury. Cells Tissues Organs 2011; 193:298-309. [PMID: 21411964 DOI: 10.1159/000323677] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
In this study, patterns of activity in the soleus (Sol) and tibialis anterior (TA) muscles and hindlimb kinematics were evaluated during slope walking in rats after transection and surgical repair either of the entire sciatic nerve (Sci group) or of its two branches separately, the tibial and common fibular nerves (T/CF group). With the latter method, axons from the tibial and common fibular nerves could not reinnervate targets of the other nerve branch after injury, reducing the opportunity for misdirection. Activity in the TA shifted from the swing phase in intact rats to nearly the entire step cycle in both injured groups. Since these changes occur without misdirection of regenerating axons, they are interpreted as centrally generated. Sol activity was changed from reciprocal to that of TA in intact rats to coactivate with TA, but only in the Sci group rats. In the T/CF group rats, Sol activity was not altered from that observed in intact rats. Despite effects of injury that limited foot movements, hindlimb kinematics were conserved during downslope walking in both injury groups and during level walking in the T/CF group. During level walking in the Sci group and during upslope walking in both groups of injured rats, the ability to compensate for the effects of the nerve injury was less effective and resulted in longer limb lengths held at more acute angles throughout the step cycle. Changes in limb movements occur irrespective of axon misdirection and reflect compensatory changes in the outputs of the neural circuits that drive locomotion.
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Affiliation(s)
- Manning J Sabatier
- Department of Cell Biology, Emory University School of Medicine, Atlanta, GA, USA.
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Rannou F, Pennec JP, Rossignol B, Morel J, Dorange G, Arvieux C, Gioux M, Giroux-Metges MA. Effects of chronic sepsis on rat motor units: Experimental study of critical illness polyneuromyopathy. Exp Neurol 2007; 204:741-7. [PMID: 17316611 DOI: 10.1016/j.expneurol.2007.01.006] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2006] [Revised: 12/14/2006] [Accepted: 01/05/2007] [Indexed: 01/09/2023]
Abstract
Critical illness polyneuromyopathy (CIP) leads to major muscle weakness correlated with peripheral nerve and/or muscle alterations. Because sepsis seems to be the main factor, we used an experimental model of chronic sepsis in rats to study the localization of the first alterations on isolated motor units of soleus muscle. Seven days of chronic sepsis leads to a decrease in muscle force and an increase in muscle fatigability. Muscle twitch contraction time is also slower and all the motor units exhibit a slow profile in septic rats. Motor axon conduction velocity remains normal. We observed a significant increase in the latency between nerve and muscle action potentials but no modifications in the electromechanical delay. The first action of sepsis on motor units seems to be a delayed trigger of muscle action potential along with a muscle weakness but without nerve conduction impairment.
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Affiliation(s)
- Fabrice Rannou
- Laboratoire de Physiologie, Faculté de Médecine de Brest, CS 93837, 29238 BREST Cedex 3, France
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