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Motor unit recruitment for dynamic tasks: current understanding and future directions

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Abstract

Skeletal muscle contains many muscle fibres that are functionally grouped into motor units. For any motor task there are many possible combinations of motor units that could be recruited and it has been proposed that a simple rule, the ‘size principle’, governs the selection of motor units recruited for different contractions. Motor units can be characterised by their different contractile, energetic and fatigue properties and it is important that the selection of motor units recruited for given movements allows units with the appropriate properties to be activated. Here we review what is currently understood about motor unit recruitment patterns, and assess how different recruitment patterns are more or less appropriate for different movement tasks. During natural movements the motor unit recruitment patterns vary (not always holding to the size principle) and it is proposed that motor unit recruitment is likely related to the mechanical function of the muscles. Many factors such as mechanics, sensory feedback, and central control influence recruitment patterns and consequently an integrative approach (rather than reductionist) is required to understand how recruitment is controlled during different movement tasks. Currently, the best way to achieve this is through in vivo studies that relate recruitment to mechanics and behaviour. Various methods for determining motor unit recruitment patterns are discussed, in particular the recent wavelet-analysis approaches that have allowed motor unit recruitment to be assessed during natural movements. Directions for future studies into motor recruitment within and between functional task groups and muscle compartments are suggested.

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References

  • Albuquerque EX, Thesleff S (1968) A comparative study of membrane properties of innervated and chronically denervated fast and slow skeletal muscles of the rat. Acta Physiol Scand 73:471–480

    PubMed  CAS  Google Scholar 

  • Andreassen S, Arendt-Nielsen L (1987) Muscle fibre conduction velocity in motor units of the human anterior tibial muscle: a new size principle parameter. J Physiol 391:561–571

    PubMed  CAS  Google Scholar 

  • Basmajian JV (1963) Control and training of individual motor units. Science 141:440–441

    PubMed  CAS  Google Scholar 

  • Bawa P, Binder MD, Ruenzel P, Henneman E (1984) Recruitment order of motoneurons in stretch reflexes is highly correlated with their axonal conduction velocity. J Neurophysiol 52:410–420

    PubMed  CAS  Google Scholar 

  • Biewener AA, Daley MA (2007) Unsteady locomotion: integrating muscle function with whole body dynamics and neuromuscular control. J Exp Biol 210:2949–2960

    PubMed  Google Scholar 

  • Bottinelli R, Betto R, Schiaffino S, Reggiani C (1994a) Maximum shortening velocity and coexistence of myosin heavy chain isoforms in single skinned fast fibres of rat skeletal muscle. J Muscle Res Cell Motil 15:413–419

    PubMed  CAS  Google Scholar 

  • Bottinelli R, Betto R, Schiaffino S, Reggiani C (1994b) Unloaded shortening velocity and myosin heavy chain and alkali light chain isoform composition in rat skeletal muscle fibres. J Physiol 478(Pt 2):341–349

    PubMed  CAS  Google Scholar 

  • Brody LR, Pollock MT, Roy SH, De Luca CJ, Celli B (1991) pH-induced effects on median frequency and conduction velocity of the myoelectric signal. J Appl Physiol 71:1878–1885

    PubMed  CAS  Google Scholar 

  • Brown IE, Cheng EJ, Loeb GE (1999) Measured and modeled properties of mammalian skeletal muscle. II. The effects of stimulus frequency on force-length and force-velocity relationships. J Muscle Res Cell Motil 20:627–643

    PubMed  CAS  Google Scholar 

  • Brown IE, Loeb GE (2000) Measured and modeled properties of mammalian skeletal muscle: IV. Dynamics of activation and deactivation. J Muscle Res Cell Motil 21:33–47

    PubMed  CAS  Google Scholar 

  • Buchthal F, Guld C, Rosenfalk P (1955) Innervation zone and propagation velocity in human muscles. Acta Physiol Scand 35:174–190

    PubMed  CAS  Google Scholar 

  • Buchthal F, Dahl K, Rosenfalck P (1973) Rise time of the spike potential in fast and slowly contracting muscle of man. Acta Physiol Scand 87:261–269

    PubMed  CAS  Google Scholar 

  • Burke RE, Rymer WZ (1976) Relative strength of synaptic input from short-latency pathways to motor units of defined type in cat medial gastrocnemius. J Neurophysiol 39:447–458

    PubMed  CAS  Google Scholar 

  • Burke RE, Levine DN, Tsairis P, Zajac FEIII (1973) Physiological types and histochemical profiles in motor units of the cat gastrocnemius. J Physiol 234:723–748

    PubMed  CAS  Google Scholar 

  • Calude CS, Stay MA (1995) From the Heisenberg to Godel via Chaitin. Int J Theor Phys 44:1053–1065

    Google Scholar 

  • Capaday C, Stein RB (1987) Difference in the amplitude of the human soleus H reflex during walking and running. J Physiol 392:513–522

    PubMed  CAS  Google Scholar 

  • Caiozzo VJ, Baldwin KM (1997) Determinants of work produced by skeletal muscle: potential limitations of activation and relaxation. Am J Physiol 273:C1049–C1056

    PubMed  CAS  Google Scholar 

  • Chanaud CM, Macpherson JM (1991) Functionally complex muscles of the cat hindlimb. III. Differential activation within biceps femoris during postural perturbations. Exp Brain Res 85:271–280

    PubMed  CAS  Google Scholar 

  • Chanaud CM, Pratt CA, Loeb GE (1991) Functionally complex muscles of the cat hindlimb. II. Mechanical and architectural heterogenity within the biceps femoris. Exp Brain Res 85:257–270

    PubMed  CAS  Google Scholar 

  • Chiel HJ, Beer RD (1997) The brain has a body: adaptive behaviour emerges from interaction of nervous system, body and environment. Trends Neurosci 20:553–557

    PubMed  CAS  Google Scholar 

  • Close RI (1972) The relations between sarcomere length and characteristics of isometric twitch contractions of frog sartorius muscle. J Physiol 220:745–762

    PubMed  CAS  Google Scholar 

  • Cope TC, Bodine SC, Fournier M, Edgerton VR (1986) Soleus motor units in chronic spinal transected cats: physiological and morphological alterations. J Neurophysiol 55:1202–1220

    PubMed  CAS  Google Scholar 

  • Dacko SM, Sokoloff AJ, Cope TC (1996) Recruitment of triceps surae motor units in the decerebrate cat. I. Independence of type S units in soleus and medial gastrocnemius muscles. J Neurophysiol 75:1997–2004

    PubMed  CAS  Google Scholar 

  • DeLuca CJ (1993) Precision decomposition of EMG signals. Methods Clin Neurophysiol 4:1–28

    Google Scholar 

  • DeLuca CJ (1997) The use of surface electromyography in biomechanics. J Appl Biomech 13:135–136

    Google Scholar 

  • Dial KP, Kaplan SR, Goslow GE Jr, Jenkins FA Jr (1987) Structure and neural control of the pectoralis in pigeons: implications for flight mechanics. Anat Rec 218:284–287

    PubMed  CAS  Google Scholar 

  • Doud JR, Walsh JM (1995) Muscle fatigue and muscle length interaction: effect on the EMG frequency components. Electromyogr Clin Neurophysiol 35:331–339

    PubMed  CAS  Google Scholar 

  • Ellaway PH (1971) Recurrent inhibition of fusimotor neurones exhibiting background discharges in the decerebrate and the spinal cat. J Physiol 216:419–439

    PubMed  CAS  Google Scholar 

  • English AW, Weeks OI (1987) An anatomical and functional analysis of cat biceps femoris and semitendinosus muscles. J Morphol 191:161–175

    PubMed  CAS  Google Scholar 

  • Farina D, Fosci M, Merletti R (2002) Motor unit recruitment strategies investigated by surface EMG variables. J Appl Physiol 92:235–247

    PubMed  Google Scholar 

  • Fedde MR, DeWet PD, Kitchell RL (1969) Motor unit recruitment pattern and tonic activity in respiratory muscles of Gallus domesticus. J Neurophysiol 32:995–1004

    PubMed  CAS  Google Scholar 

  • Fleshman JW, Munson JB, Sypert GW, Friedman WA (1981) Rheobase, input resistance, and motor-unit type in medial gastrocnemius motoneurons in the cat. J Neurophysiol 46:1326–1338

    PubMed  CAS  Google Scholar 

  • Freund HJ, Budingen HJ, Dietz V (1975) Activity of single motor units from human forearm muscles during voluntary isometric contractions. J Neurophysiol 38:933–946

    PubMed  CAS  Google Scholar 

  • Friedman WA, Sypert GW, Munson JB, Fleshman JW (1981) Recurrent inhibition in type-identified motoneurons. J Neurophysiol 46:1349–1359

    PubMed  CAS  Google Scholar 

  • Frigon A, Rossignol S (2006) Experiments and models of sensorimotor interactions during locomotion. Biol Cybern 95:607–627

    PubMed  Google Scholar 

  • Garnett RAF, O’Donovan MJ, Stephens JA, Taylor A (1978) Motor units organization of human medial gastrocnemius. J Physiol 287:33–43

    Google Scholar 

  • Gerdle B, Wretling ML, Henriksson-Larsen K (1988) Do the fibre-type proportion and the angular velocity influence the mean power frequency of the electromyogram? Acta Physiol Scand 134:341–346

    PubMed  CAS  Google Scholar 

  • Gillespie CA, Simpson DR, Edgerton VR (1974) Motor unit recruitment as reflected by muscle fibre glycogen loss in a prosimian (bushbaby) after running and jumping. J Neurol Neurosurg Psychiatry 37:817–824

    PubMed  CAS  Google Scholar 

  • Gollnick PD, Piehl K, Saltin B (1974) Selective glycogen depletion pattern in human muscle fibres after exercise of varying intensity and at varying pedalling rates. J Physiol 241:45–57

    PubMed  CAS  Google Scholar 

  • Grimby L, Hannerz J (1977) Firing rate and recruitment order of toe extensor motor units in different modes of voluntary contraction. J Physiol 264:865–879

    PubMed  CAS  Google Scholar 

  • Hakansson CH (1956) Conduction velocity and amplitude of the action potential as related to circumference in the isolated fibre of frog muscle. Acta Physiol Scand 37:14–34

    Article  PubMed  CAS  Google Scholar 

  • He Z-H, Bottinelli R, Pellegrino MA, Ferenczi MA, Reggiani C (2000) ATP consumption and efficiency of human single muscle fibers with different myosin isoform composition. Biophys J 79:945–961

    PubMed  CAS  Google Scholar 

  • Henneman E (1957) Relation between size of neurons and their susceptibility to discharge. Science 126:1345–1347

    PubMed  CAS  Google Scholar 

  • Henneman E, Clamann HP, Gillies JD, Skinner RD (1974) Rank order of motoneurons within a pool: law of combination. J Neurophysiol 37:1338–1349

    PubMed  CAS  Google Scholar 

  • Henneman E, Olson CB (1965) Relations between structure and function in the design of skeletal muscles. J Neurophysiol 28:581–598

    PubMed  CAS  Google Scholar 

  • Henneman E, Somjen G, Carpenter DO (1965a) Excitability and inhibitability of motoneurons of different sizes. J Neurophysiol 28:599–620

    PubMed  CAS  Google Scholar 

  • Henneman E, Somjen G, Carpenter DO (1965b) Functional significance of cell size in spinal motoneurons. J Neurophysiol 28:560–580

    PubMed  CAS  Google Scholar 

  • Herring SW, Grimm AF, Grimm BR (1979) Functional heterogeneity in a multipinnate muscle. Am J Anat 154:563–576

    PubMed  CAS  Google Scholar 

  • Higham TE, Biewener A, Wakeling JM (2008) Functional diversification within and between muscle synergisists during locomotion. Biology Letters 4:41–44

    PubMed  Google Scholar 

  • Hodgkin AL (1954) A note on conduction velocity. J Physiol 125:221–224

    PubMed  CAS  Google Scholar 

  • Hodson-Tole EF, Wakeling JM (2007) Variations in motor unit recruitment patterns occur within and between muscles in the running rat (Rattus norvegicus). J Exp Biol 210:2333–2345

    PubMed  CAS  Google Scholar 

  • Hodson-Tole EF, Wakeling JM (2008a) Motor unit recruitment patterns 1: responses to changes in locomotor velocity and incline. J Exp Biol 211:1882–1892

    PubMed  Google Scholar 

  • Hodson-Tole EF, Wakeling JM (2008b) Motor unit recruitment patterns 2: the influence on myoelectric intensity and muscle fascicle strain rate. J Exp Biol 211:1893–1902

    PubMed  Google Scholar 

  • Hoffer JA, Loeb GE, Marks WB, O’Donovan MJ, Pratt CA, Sugano N (1987a) Cat hindlimb motoneurons during locomotion. I. Destination, axonal conduction velocity, and recruitment threshold. J Neurophysiol 57:510–529

    PubMed  CAS  Google Scholar 

  • Hoffer JA, Loeb GE, Sugano N, Marks WB, O’Donovan MJ, Pratt CA (1987b) Cat hindlimb motoneurons during locomotion. III. Functional segregation in sartorius. J Neurophysiol 57:554–562

    PubMed  CAS  Google Scholar 

  • Hoffer JA, O’Donovan MJ, Pratt CA, Loeb GE (1981) Discharge patterns of hindlimb motoneurons during normal cat locomotion. Science 213:466–467

    PubMed  CAS  Google Scholar 

  • Hogrel JY (2003) Use of surface EMG for studying motor unit recruitment during isometric linear force ramp. J Electromyogr Kinesiol 13:417–423

    PubMed  Google Scholar 

  • Houtman CJ, Stegeman DF, Van Dijk JP, Zwarts MJ (2003) Changes in muscle fiber conduction velocity indicate recruitment of distinct motor unit populations. J Appl Physiol 95:1045–1054

    PubMed  CAS  Google Scholar 

  • Hultborn H (1972) Convergence on interneurones in the reciprocal Ia inhibitory pathway to motoneurones. Acta Physiol Scand Suppl 375:1–42

    Article  PubMed  CAS  Google Scholar 

  • Hultborn H, Jankowska E, Lindstrom S (1971) Recurrent inhibition from motor axon collaterals of transmission in the Ia inhibitory pathway to motoneurones. J Physiol 215:591–612

    PubMed  CAS  Google Scholar 

  • Johnston IA (1991) Muscle action during locomotion: a comparative perspective. J Exp Biol 160:167–185

    PubMed  CAS  Google Scholar 

  • Josephson R, Stokes D (1999) Work-dependent deactivation of a crustacean muscle. J Exp Biol 202:2551–2565

    PubMed  Google Scholar 

  • Kaiser G (1994) A friendly guide to wavelets. Birkhaeuser, Boston

    Google Scholar 

  • Karlsson S, Yu J, Akay M (2000) Time-frequency analysis of myoelectric signals during dynamic contractions: a comparative study. IEEE Trans Biomed Eng 47:228–238

    PubMed  CAS  Google Scholar 

  • Katz R, Pierrot-Deseilligny E (1998) Recurrent inhibition in humans. Prog Neurobiol 27:325–355

    Google Scholar 

  • Kier WM, Curtin NA (2002) Fast muscle in squid (Loligo pealei): contractile properties of a specialized muscle fibre type. J Exp Biol 205:1907–1916

    PubMed  Google Scholar 

  • Kupa EJ, Roy SH, Kandarian SC, De Luca CJ (1995) Effects of muscle fiber type and size on EMG median frequency and conduction velocity. J Appl Physiol 79:23–32

    PubMed  CAS  Google Scholar 

  • Lindstrom LH, Magnusson RI (1977) Interpretation of myoelectric power spectra: a model and its applications. Proc IEEE 65:653–662

    Google Scholar 

  • Lindstrom S, Schomburg ED (1973) Recurrent inhibition from motor axon collaterals of ventral spinocerebellar tract neurones. Acta Physiol Scand 88:505–515

    PubMed  CAS  Google Scholar 

  • Loeb GE (1984) The control responses of mammalian muscle spindles during normally executed tasks. Exerc Sport Sci Rev 12:157–204

    PubMed  CAS  Google Scholar 

  • Loeb GE (1985) Motoneurone task groups: coping with kinematic heterogeneity. J Exp Biol 115:137–146

    PubMed  CAS  Google Scholar 

  • Loeb GE, Bak MJ, Duysens J (1977) Long-term unit recording from somatosensory neurons in the spinal ganglia of the freely walking cat. Science 197:1192–1194

    PubMed  CAS  Google Scholar 

  • Luff AR, Atwood HL (1972) Membrane properties and contraction of single muscle fibers in the mouse. Am J Physiol 222:1435–1440

    PubMed  CAS  Google Scholar 

  • McPhedran AM, Wuerker RB, Henneman E (1965a) Properties of motor units in a heterogeneous pale muscle (M. Gastrocnemius) of the cat. J Neurophysiol 28:85–99

    PubMed  CAS  Google Scholar 

  • McPhedran AM, Wuerker RB, Henneman E (1965b) Properties of motor units in a homogeneous red muscle (Soleus) of the cat. J Neurophysiol 28:71–84

    PubMed  CAS  Google Scholar 

  • Milner-Brown HS, Stein RB, Yemm R (1973) The orderly recruitment of human motor units during voluntary isometric contractions. J Physiol 230:359–370

    PubMed  CAS  Google Scholar 

  • Mortimer JT, Magnusson R, Petersen I (1970) Conduction velocity in ischemic muscle: effect on EMG frequency spectrum. Am J Physiol 219:1324–1329

    PubMed  CAS  Google Scholar 

  • Murphy PR, Martin HA (1993) Fusimotor discharge patterns during rhythmic movements. Trends Neurosci 16:273–278

    PubMed  CAS  Google Scholar 

  • Nardone A, Romano C, Schieppati M (1989) Selective recruitment of high-threshold human motor units during voluntary isotonic lengthening of active muscles. J Physiol 409:451–471

    PubMed  CAS  Google Scholar 

  • Neptune RR, Kautz SA (2001) Muscle activation and deactivation dynamics: the governing properties in fast cyclical human movement performance? Exerc Sport Sci Rev 29:76–81

    PubMed  CAS  Google Scholar 

  • Nichols TR, Houk JC (1976) Improvement in linearity and regulation of stiffness that results from the actions of the stretch reflex. J Neurophysiol 29:119–142

    Google Scholar 

  • Nigg BM, Wakeling JM (2001) Impact forces and muscle tuning: a new paradigm. Exerc Sport Sci Rev 29:37–41

    PubMed  CAS  Google Scholar 

  • Olson CB, Carpenter DO, Henneman E (1968) Orderly recruitment of muscle action potentials. Arch Neurol 19:591–597

    PubMed  CAS  Google Scholar 

  • Pearson K, Ekeberg Ö, Büschges A (2006) Assessing sensory function in locomotor systems using neuro-mechanical simulations. Trends Neurosci 29:625–631

    PubMed  CAS  Google Scholar 

  • Pratt CA, Jordan LM (1980) Recurrent inhibition of motoneurons in decerebrate cats during controlled treadmill locomotion. J Neurophysiol 44:489–500

    PubMed  CAS  Google Scholar 

  • Pratt CA, Loeb GE (1991) Functionally complex muscles of the cat hindlimb. I. Patterns of activation across sartorius. Exp Brain Res 85:243–256

    PubMed  CAS  Google Scholar 

  • Prochazka A (1996) Proprioceptive feedback and movement regulation. In: Rowell L, Shepherd JT (eds) Handbook of physiology, exercise: regulation and integration of multiple systems. American Physiological Society, New York, pp 89–127

    Google Scholar 

  • Prochazka A, Gorassini M (1998) Ensemble firing of muscle afferents recorded during normal locomotion in cats. J Physiol 507:293–304

    PubMed  CAS  Google Scholar 

  • Prochazka A, Westerman RA, Ziccone SP (1976) Discharges of single hindlimb afferents in the freely moving cat. J Neurophysiol 39:1090–1104

    PubMed  CAS  Google Scholar 

  • Proske U, Waite PM (1976) The relation between tension and axonal conduction velocity for motor units in the medial gastrocnemius muscle of the cat. Exp Brain Res 26:325–328

    PubMed  CAS  Google Scholar 

  • Renshaw B (1941) Influence of discharge of motoneurons upon excitation of neighboring motoneurons. J Neurophysiol 4:167–183

    Google Scholar 

  • Renshaw B (1946) Central effects of centripetal impulses in axons of spinal ventral roots. J Neurophysiol 9:191–204

    Google Scholar 

  • Riek S, Bawa P (1992) Recruitment of motor units in human forearm extensors. J Neurophysiol 68:100–108

    PubMed  CAS  Google Scholar 

  • Rossignol S, Dubuc R, Gossard JP (2006) Dynamic sensorimotor interactions in locomotion. Physiol Rev 86:89–154

    PubMed  Google Scholar 

  • Roeleveld K, Blok JH, Stegeman DF, van Oosterom A (1997) Volume conduction models for surface EMG; confrontation with measurements. J Electromyogr Kinesiol 7:221–232

    PubMed  Google Scholar 

  • Rome LC, Funke RP, Alexander RM, Lutz GJ, Aldridge H, Scott F, Freadman M (1988) Why animals have different muscle fibre types. Nature 335:824–827

    PubMed  CAS  Google Scholar 

  • Roszek B, Baan GC, Huijing PA (1994) Decreasing stimulation frequency-dependent length-force characteristics of rat muscle. J Appl Physiol 77:2115–2124

    PubMed  CAS  Google Scholar 

  • Ryall RW (1970) Renshaw cell mediated inhibition of Renshaw cells: patterns of excitation and inhibition from impulses in motor axon collaterals. J Neurophysiol 33:257–270

    PubMed  CAS  Google Scholar 

  • Ryall RW, Piercey MF, Polosa C, Goldfarb J (1972) Excitation of Renshaw cells in relation to orthodromic and antidromic excitation of motoneurons. J Neurophysiol 35:137–148

    PubMed  CAS  Google Scholar 

  • Sadoyama T, Masuda T, Miyata H, Katsuta S (1988) Fibre conduction velocity and fibre composition in human vastus lateralis. Eur J Appl Physiol Occup Physiol 57:767–771

    PubMed  CAS  Google Scholar 

  • Schieber MH (1993) Electromyographic evidence of two functional subdivisions in the rhesus monkey’s flexor digitorum profundus. Exp Brain Res 95:251–260

    PubMed  CAS  Google Scholar 

  • Sherrington C (1929) Ferrier lecture: some functional problems attaching to convergence. Proc R Soc B 105:332–362

    Google Scholar 

  • Sokoloff AJ, Cope TC (1996) Recruitment of triceps surae motor units in the decerebrate cat. II. Heterogeneity among soleus motor units. J Neurophysiol 75:2005–2016

    PubMed  CAS  Google Scholar 

  • Stalberg E (1966) Propagation velocity in human muscle fibers in situ. Acta Physiol Scand Suppl 287:1–112

    PubMed  CAS  Google Scholar 

  • Stein RB, Bertoldi R (1981) Unique contributions of slow and fast extensor muscles to the control of limb movements. In: Desmedt JE (ed) Motor unit types, recruitment and plasticity in health and disease. Karger, Basel, pp 85–96

    Google Scholar 

  • Stephens JA, Stuart DG (1975) The motor units of cat medial gastrocnemius: speed–size relations and their significance for the recruitment order of mortor units. Brain Res 91:177–195

    PubMed  CAS  Google Scholar 

  • Stephens JA, Garnett R, Buller NP (1978) Reversal of recruitment order of single motor units produced by cutaneous stimulation during voluntary muscle contraction in man. Nature 272:362–364

    PubMed  CAS  Google Scholar 

  • Tanji J, Kato M (1973) Recruitment of motor units in voluntary contraction of a finger muscle in man. Exp Neurol 40:759–770

    PubMed  CAS  Google Scholar 

  • Taylor A, Gottlieb S (1985) Convergence of several sensory modalities in motor control. In: Barnes WJP, Gladden MH (eds) Feedback and motor control in invertebrates and vertebrates. Croon Helm, London, pp 77–91

    Google Scholar 

  • von Tscharner V (2000) Intensity analysis in time-frequency space of surface myoelectric signals by wavelets of specified resolution. J Electromyogr Kinesiol 10:433–445

    Google Scholar 

  • von Tscharner V (2002) Time-frequency and principal-component methods for the analysis of EMGs recorded during a mildly fatiguing exercise on a cycle ergometer. J Electromyogr Kinesiol 12:479–492

    Google Scholar 

  • Von Tscharner V, Goepfert B (2006) Estimation of the interplay between groups of fast and slow muscle fibers of the tibialis anterior and gastrocnemius muscle while running. J Electromyogr Kinesiol 16:188–197

    Google Scholar 

  • Wagman IH, Pierce DS, Burger RE (1965) Proprioceptive influence, in volitional control of individual motor units. Nature 207:957–958

    PubMed  CAS  Google Scholar 

  • Wakeling JM (2007) Patterns of motor recruitment can be determined using surface EMG. J Electromyogr Kinesiol. doi:10.1016/j.jelekin.207.09.006

  • Wakeling JM, Rozitis AI (2004) Spectral properties of myoelectric signals from different motor units in the leg extensor muscles. J Exp Biol 207:2519–2528

    PubMed  Google Scholar 

  • Wakeling JM, Syme DA (2002) Wave properties of action potentials from fast and slow motor units of rats. Muscle Nerve 26:659–668

    PubMed  Google Scholar 

  • Wakeling JM, Pascual SA, Nigg BM, Von Tscharner V (2001) Surface EMG shows distinct populations of muscle activity when measured during sustained sub-maximal exercise. Eur J Appl Physiol 86:40–47

    PubMed  CAS  Google Scholar 

  • Wakeling JM, Uehli K, Rozitis AI (2006) Muscle fibre recruitment can respond to the mechanics of the muscle contraction. J R Soc Interface 3:533–544

    PubMed  Google Scholar 

  • Wallinga-De Jonge W, Gielen FL, Wirtz P, De Jong P, Broenink J (1985) The different intracellular action potentials of fast and slow muscle fibres. Electroencephalogr Clin Neurophysiol 60:539–547

    PubMed  CAS  Google Scholar 

  • Windhorst U (2007) Muscle proprioceptive feedback and spinal networks. Brain Res Bull 73:155–202

    PubMed  CAS  Google Scholar 

  • Wretling ML, Gerdle B, Henriksson-Larsen K (1987) EMG: a non-invasive method for determination of fibre type proportion. Acta Physiol Scand 131:627–628

    PubMed  CAS  Google Scholar 

  • Zajac FE, Faden JS (1985) Relationship among recruitment order, axonal conduction velocity and muscle-unit properties of type-identified motor units in cat plantaris muscle. J Neurophysiol 53:1303–1322

    PubMed  CAS  Google Scholar 

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  1. School of Applied Physiology, Georgia Institute of Technology, Atlanta, GE, USA

    Emma F. Hodson-Tole

  2. School of Kinesiology, Simon Fraser University, Burnaby, BC, Canada

    James M. Wakeling

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  1. Emma F. Hodson-Tole
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Correspondence to James M. Wakeling.

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Communicated by I. D. Hume.

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Hodson-Tole, E.F., Wakeling, J.M. Motor unit recruitment for dynamic tasks: current understanding and future directions. J Comp Physiol B 179, 57–66 (2009). https://doi.org/10.1007/s00360-008-0289-1

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