Discharge characteristics of motor units during long-duration contractions

Experimental Physiology

Volumn 99, Issue 10, 2014, Pages 1387-1398

  Pascoe, Michael A ^a   Holmes, Matthew R ^a   Stuart, Douglas G ^b   Enoka, Roger M ^a  

^a UNIVERSITY OF COLORADO   (United States)

^b UNIVERSITY OF ARIZONA COLLEGE OF MEDICINE   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

ABDUCTION; ACTION POTENTIAL; ADULT; ARTICLE; AUDITORY FEEDBACK; CLINICAL PROTOCOL; CONTROLLED STUDY; ELECTROMYOGRAPHY; HAND MUSCLE; HUMAN; INDEX FINGER; MALE; MOTONEURON; MOTOR UNIT; MUSCLE ISOMETRIC CONTRACTION; NORMAL HUMAN; PROXIMAL INTERPHALANGEAL JOINT; TASK PERFORMANCE; ADOLESCENT; FEMALE; MIDDLE AGED; MUSCLE CONTRACTION; PHYSIOLOGY; SKELETAL MUSCLE; YOUNG ADULT;

ACTION POTENTIALS; ADOLESCENT; ADULT; FEMALE; HUMANS; MALE; MIDDLE AGED; MOTOR NEURONS; MUSCLE CONTRACTION; MUSCLE, SKELETAL; YOUNG ADULT;

EID: 84908364766     PISSN: 09580670     EISSN: 1469445X     Source Type: Journal    
DOI: 10.1113/expphysiol.2014.078584     Document Type: Article

References (59)

1. Adam A & De Luca CJ (2003). Recruitment order of motor units in human vastus lateralis muscle is maintained during fatiguing contractions. J Neurophysiol 90, 2919-2927.
2. Barry BK, Pascoe MA, Jesunathadas M & Enoka RM (2007). Rate coding is compressed but variability is unaltered for motor units in a hand muscle of old adults. J Neurophysiol 97, 3206-3218.
3. Baudry S, Rudroff T, Pierpoint LA & Enoka RM (2009). Load type influences motor unit recruitment in biceps brachii during a sustained contraction. J Neurophysiol 102, 1725-1735.
4. Bawa P & Murnaghan C (2009). Motor unit rotation in a variety of human muscles. J Neurophysiol 102, 2265-2272.
5. Bawa P, Pang MY, Olesen KA & Calancie B (2006). Rotation of motoneurons during prolonged isometric contractions in humans. J Neurophysiol 96, 1135-1140.
6. Berg RW, Alaburda A & Hounsgaard J (2007). Balanced inhibition and excitation drive spike activity in spinal half-centers. Science 315, 390-393.
7. Berg RW, Ditlevsen S & Hounsgaard J (2008). Intense synaptic activity enhances temporal resolution in spinal motoneurons. PLoS One 3, e3218.
8. Bigland-Ritchie B, Furbush FH & Woods JJ (1986). Fatigue of intermittent submaximal voluntary contractions: central and peripheral factors. J Appl Physiol 61, 421-429.
9. Bigland-Ritchie B, Johansson R, Lippold OC, Smith S & Woods JJ (1983). Changes in motoneurone firing rates during sustained maximal voluntary contractions. J Physiol 340, 335-346.
10. Bigland-Ritchie B & Lippold OC (1954). Motor unit activity in the voluntary contraction of human muscle. J Physiol 125, 322-335.
11. Calvin WH & Stevens CF (1968). Synaptic noise and other sources of randomness in motoneuron interspike intervals. J Neurophysiol 31, 574-587.
12. Carpentier A, Duchateau J & Hainaut K (2001). Motor unit behaviour and contractile changes during fatigue in the human first dorsal interosseus. J Physiol 534, 903-912.
13. Christie A & Kamen G (2009). Motor unit firing behavior during prolonged 50% MVC dorsiflexion contractions in young and older adults. J Electromyogr Kinesiol 19, 543-552.
14. Christova P & Kossev A (1998). Motor unit activity during long-lasting intermittent muscle contractions in humans. Eur J Appl Physiol Occup Physiol 77, 379-387.
15. Conwit RA, Stashuk DW, Suzuki H, Lynch N, Schrager M & Metter EJ (2000). Fatigue effects on motor unit activity during submaximal contractions. Arch Phys Med Rehabil 81, 1211-1216.
16. De Luca CJ, Foley PJ & Erim Z (1996). Motor unit control properties in constant-force isometric contractions. J Neurophysiol 76, 1503-1516.
17. De Luca CJ, LeFever RS, McCue MP & Xenakis AP (1982). Behaviour of human motor units in different muscles during linearly varying contractions. J Physiol 329, 113-128.
18. Denier van der Gon JJ, ter Haar Romeny BM & van Zuylen EJ (1985). Behaviour of motor units of human arm muscles: differences between slow isometric contraction and relaxation. J Physiol 359, 107-118.
19. Dorfman LJ, Howard JE & McGill KC (1990). Triphasic behavioral response of motor units to submaximal fatiguing exercise. Muscle Nerve 13, 621-628.
20. Enoka RM, Robinson GA & Kossev A (1989). Task and fatigue effects on low-threshold motor units in human hand muscle. J Neurophysiol 62, 1344-1359.
21. Farina D, Holobar A, Gazzoni M, Zazula D, Merletti R & Enoka RM (2009). Adjustments differ among low-threshold motor units during intermittent, isometric contractions. J Neurophysiol 101, 350-359.
22. Freund HJ, Büdingen HJ & Dietz V (1975). Activity of single motor units from human forearm muscles during voluntary isometric contractions. J Neurophysiol 38, 933-946.
23. Garland SJ, Enoka RM, Serrano LP & Robinson GA (1994). Behavior of motor units in human biceps brachii during a submaximal fatiguing contraction. J Appl Physiol 76, 2411-2419.
24. Jesunathadas M, Marmon AR, Gibb JM & Enoka RM (2010). Recruitment and derecruitment characteristics of motor units in a hand muscle of young and old adults. J Appl Physiol 108, 1659-1667.
25. Johnson KVB, Edwards SC, Van Tongeren C & Bawa P (2004). Properties of human motor units after prolonged activity at a constant firing rate. Exp Brain Res 154, 479-487.
26. Kamo M & Morimoto S (2001). Discharge properties of human motor units during sustained contraction at low level force. J Electromyogr Kinesiol 11, 255-261.
27. Kanosue K, Yoshida M, Akazawa K & Fujii K (1979). The number of active motor units and their firing rates in voluntary contraction of human brachialis muscle. Jpn J Physiol 29, 427-443.
28. Kernell D & Monster AW (1982a). Time course and properties of late adaptation in spinal motoneurones of the cat. Exp Brain Res 46, 191-196.
29. Kernell D & Monster AW (1982b). Motoneurone properties and motor fatigue. An intracellular study of gastrocnemius motoneurones of the cat. Exp Brain Res 46, 197-204.
30. Kiernan MC, Lin CS-Y & Burke D (2004). Differences in activity-dependent hyperpolarization in human sensory and motor axons. J Physiol 558, 341-349.
31. Löscher WN, Cresswell AG & Thorstensson A (1996). Recurrent inhibition of soleus alpha-motoneurons during a sustained submaximal plantar flexion. Electroencephalogr Clin Neurophysiol 101, 334-338.
32. MacDonell CW, Ivanova TD & Garland SJ (2010). Changes in the estimated time course of the motoneuron afterhyperpolarization induced by tendon vibration. J Neurophysiol 104, 3240-3249.
33. Manning CD, Miller TA, Burnham ML, Murnaghan CD, Calancie B & Bawa P (2010). Recovery of human motoneurons during rotation. Exp Brain Res 204, 139-144.
34. Matthews PBC (1996). Relationship of firing intervals of human motor units to the trajectory of post-spike after-hyperpolarization and synaptic noise. J Physiol 492, 597-628.
35. Matthews PBC (1999). Properties of human motoneurones and their synaptic noise deduced from motor unit recordings with the aid of computer modelling. J Physiol Paris 93, 135-145.
36. Miles GB, Dai Y & Brownstone RM (2005). Mechanisms underlying the early phase of spike frequency adaptation in mouse spinal motoneurones. J Physiol 566, 519-532.
37. Milner-Brown HS, Stein RB & Yemm R (1973). The orderly recruitment of human motor units during voluntary isometric contractions. J Physiol 230, 359-370.
38. Moritz CT, Barry BK, Pascoe MA & Enoka RM (2005). Discharge rate variability influences the variation in force fluctuations across the working range of a hand muscle. J Neurophysiol 93, 2449-2459.
39. Mottram CJ, Jakobi JM, Semmler JG & Enoka RM (2005). Motor-unit activity differs with load type during a fatiguing contraction. J Neurophysiol 93, 1381-1392.
40. Nordstrom MA & Miles TS (1991). Discharge variability and physiological properties of human masseter motor units. Brain Res 541, 50-56.
41. Oldfield RC (1971). The assessment and analysis of handedness: the Edinburgh inventory. Neuropsychologia 9, 97-113.
42. Oya T, Riek S & Cresswell AG (2009). Recruitment and rate coding organisation for soleus motor units across entire range of voluntary isometric plantar flexions. J Physiol 587, 4737-4748.
43. Pascoe MA, Enoka JA & Enoka RM (2006). Discharge characteristics of single motor units during long contractions. Soc Neurosci Abstr #652.613.
44. Pascoe MA, Holmes MR & Enoka RM (2009). Discharge characteristics of motor units during long contractions performed by young and old adults. Soc Neurosci Abstr #179.123.
45. Pascoe MA, Holmes MR & Enoka RM (2011). Discharge characteristics of biceps brachii motor units at recruitment when older adults sustained an isometric contraction. J Neurophysiol 105, 571-581.
46. Patten C & Kamen G (2000). Adaptations in motor unit discharge activity with force control training in young and older human adults. Eur J Appl Physiol 83, 128-143.
47. Person RS & Kudina L (1972). Discharge frequency and discharge pattern of human motor units during voluntary contraction of muscle. Electroencephalogr Clin Neurophysiol 32, 471-483.
48. Peters EJ & Fuglevand AJ (1999). Cessation of human motor unit discharge during sustained maximal voluntary contraction. Neurosci Lett 274, 66-70.
49. Riley ZA, Maerz A, Litsey J & Enoka RM (2008). Motor unit recruitment in human biceps brachii during sustained voluntary contractions. J Physiol 586, 2183-2193.
50. Romaiguère P, Vedel JP & Pagni S (1993). Comparison of fluctuations of motor unit recruitment and de-recruitment thresholds in man. Exp Bran Res 95, 517-522.
51. Sawczuk A, Powers RK & Binder MD (1995). Spike frequency adaptation studied in hypoglossal motoneurons of the rat. J Neurophysiol 73, 1799-1810.
52. Seyffarth H (1940). The behaviour of motor-units in voluntary contraction. Avhandlinger Utgitt Norske Videnskap-Akad Oslo I Matematisk-Naturvidenskapelig Klasse 4, 1-63.
53. Spiegel KM, Stratton J, Burke JR, Glendinning DS & Enoka RM (1996). The influence of age on the assessment of motor unit activation in a human hand muscle. Exp Physiol 81, 805-819.
54. Spielmann JM, Laouris Y, Nordstrom MA, Robinson GA, Reinking RM & Stuart DG (1993). Adaptation of cat motoneurons to sustained and intermittent extracellular activation. J Physiol 464, 75-120.
55. Suzuki S, Hayami A, Suzuki M, Watanabe S & Hutton RS (1990). Reductions in recruitment force thresholds in human single motor units by successive voluntary contractions. Exp Brain Res 82, 227-230.
56. Tanji J & Kato M (1973). Firing rate of individual motor units in voluntary contraction of abductor digiti minimi muscle in man. Exp Neurol 40, 771-783.
57. van Groeningen CJ, Nijhof EJ, Vermeule FM & Erkelens CJ (2000). Relation between torque history, firing frequency, decruitment levels and force balance in two flexors of the elbow. Exp Brain Res 129, 592-604.
58. Westad C, Mork PJ & Westgaard RH (2004). Firing patterns of low-threshold trapezius motor units in feedback-controlled contractions and vocational motor activities. Exp Brain Res 158, 465-473.
59. Westgaard RH & De Luca CJ (1999). Motor unit substitution in long-duration contractions of the human trapezius muscle. J Neurophysiol 82, 501-504.