• 1
    White KP, Speechley M, Harth M, Ostbye T. The London Fibromyalgia Epidemiology Study: comparing the demographic and clinical characteristics in 100 random community cases of fibromyalgia versus controls. J Rheumatol 1999; 26: 157785.
  • 2
    Panton LB, Kingsley JD, Toole T, Cress ME, Abboud G, Sirithienthad P, et al. A comparison of physical functional performance and strength in women with fibromyalgia, age- and weight-matched controls, and older women who are healthy. Phys Ther 2006; 86: 147988.
  • 3
    Mannerkorpi K, Burckhardt CS, Bjelle A. Physical performance characteristics of women with fibromyalgia. Arthritis Care Res 1994; 7: 1239.
  • 4
    Maquet D, Croisier JL, Renard C, Crielaard JM. Muscle performance in patients with fibromyalgia. Joint Bone Spine 2002; 69: 2939.
  • 5
    Wolfe F, Anderson J, Harkness D, Bennett RM, Caro XJ, Goldenberg DL, et al. A prospective, longitudinal, multicenter study of service utilization and costs in fibromyalgia. Arthritis Rheum 1997; 40: 156070.
  • 6
    Henriksson CM, Liedberg GM, Gerdle B. Women with fibromyalgia: work and rehabilitation. Disabil Rehabil 2005; 27: 68594.
  • 7
    Marsh AP, Miller ME, Saikin AM, Rejeski WJ, Hu N, Lauretani F, et al. Lower extremity strength and power are associated with 400-meter walk time in older adults: the InCHIANTI study. J Gerontol A Biol Sci Med Sci 2006; 61: 118693.
  • 8
    Danneskiold-Samsoe B, Grimby G. The relationship between the leg muscle strength and physical capacity in patients with rheumatoid arthritis, with reference to the influence of corticosteroids. Clin Rheumatol 1986; 5: 46874.
  • 9
    Madsen OR, Egsmose C. Associations of isokinetic knee extensor and flexor strength with steroid use and walking ability in women with rheumatoid arthritis. Clin Rheumatol 2001; 20: 20712.
  • 10
    Madsen OR, Bliddal H, Egsmose C, Sylvest J. Isometric and isokinetic quadriceps strength in gonarthrosis; inter-relations between quadriceps strength, walking ability, radiology, subchondral bone density and pain. Clin Rheumatol 1995; 14: 30814.
  • 11
    Patterson SL, Forrester LW, Rodgers MM, Ryan AS, Ivey FM, Sorkin JD, et al. Determinants of walking function after stroke: differences by deficit severity. Arch Phys Med Rehabil 2007; 88: 1159.
  • 12
    Norregaard J, Bulow PM, Danneskiold-Samsoe B. Muscle strength, voluntary activation, twitch properties, and endurance in patients with fibromyalgia. J Neurol Neurosurg Psychiatry 1994; 57: 110611.
  • 13
    Valkeinen H, Hakkinen A, Hannonen P, Hakkinen K, Alen M. Acute heavy-resistance exercise–induced pain and neuromuscular fatigue in elderly women with fibromyalgia and in healthy controls: effects of strength training. Arthritis Rheum 2006; 54: 13349.
  • 14
    Backman E, Bengtsson A, Bengtsson M, Lennmarken C, Henriksson KG. Skeletal muscle function in primary fibromyalgia: effect of regional sympathetic blockade with guanethidine. Acta Neurol Scand 1988; 77: 18791.
  • 15
    Vestergaard-Poulsen P, Thomsen C, Norregaard J, Bulow P, Sinkjaer T, Henriksen O. 31P NMR spectroscopy and electromyography during exercise and recovery in patients with fibromyalgia. J Rheumatol 1995; 22: 154451.
  • 16
    Verstappen F, van Santen-Hoeufft H, van Sloun S, Bolwijn P, van der Linden S. Fitness characteristics of female patients with fibromyalgia. J Musculoskelet Pain 1995; 3: 4558.
  • 17
    Sahin G, Ulubas B, Calikoglu M, Erdogan C. Handgrip strength, pulmonary function tests, and pulmonary muscle strength in fibromyalgia syndrome: is there any relationship? South Med J 2004; 97: 259.
  • 18
    Kadetoff D, Kosek E. The effects of static muscular contraction on blood pressure, heart rate, pain ratings and pressure pain thresholds in healthy individuals and patients with fibromyalgia. Eur J Pain 2007; 11: 3947.
  • 19
    Mengshoel AM, Forre O, Komnaes HB. Muscle strength and aerobic capacity in primary fibromyalgia. Clin Exp Rheumatol 1990; 8: 4759.
  • 20
    Borman P, Celiker R, Hascelik Z. Muscle performance in fibromyalgia syndrome. Rheumatol Int 1999; 19: 2730.
  • 21
    Jacobsen S, Danneskiold-Samsoe B. Isometric and isokinetic muscle strength in patients with fibrositis syndrome: new characteristics for a difficult definable category of patients. Scand J Rheumatol 1987; 16: 615.
  • 22
    Jacobsen S, Wildschiodtz G, Danneskiold-Samsoe B. Isokinetic and isometric muscle strength combined with transcutaneous electrical muscle stimulation in primary fibromyalgia syndrome. J Rheumatol 1991; 18: 13903.
  • 23
    Lindh MH, Johansson LG, Hedberg M, Grimby GL. Studies on maximal voluntary muscle contraction in patients with fibromyalgia. Arch Phys Med Rehabil 1994; 75: 121722.
  • 24
    Nordenskiold UM, Grimby G. Grip force in patients with rheumatoid arthritis and fibromyalgia and in healthy subjects: a study with the Grippit instrument. Scand J Rheumatol 1993; 22: 149.
  • 25
    Norregaard J, Bulow PM, Vestergaard-Poulsen P, Thomsen C, Danneskiold-Samsoe B. Muscle strength, voluntary activation and cross-sectional muscle area in patients with fibromyalgia. Br J Rheumatol 1995; 34: 92531.
  • 26
    Norregaard J, Bulow PM, Lykkegaard JJ, Mehlsen J, Danneskiold-Samsoe B. Muscle strength, working capacity and effort in patients with fibromyalgia. Scand J Rehabil Med 1997; 29: 97102.
  • 27
    Hakkinen A, Hakkinen K, Hannonen P, Alen M. Strength training induced adaptations in neuromuscular function of premenopausal women with fibromyalgia: comparison with healthy women. Ann Rheum Dis 2001; 60: 216.
  • 28
    Valkeinen H, Alen M, Hannonen P, Hakkinen A, Airaksinen O, Hakkinen K. Changes in knee extension and flexion force, EMG and functional capacity during strength training in older females with fibromyalgia and healthy controls. Rheumatology (Oxford) 2004; 43: 2258.
  • 29
    Graven-Nielsen T, Lund H, Arendt-Nielsen L, Danneskiold-Samsoe B, Bliddal H. Inhibition of maximal voluntary contraction force by experimental muscle pain: a centrally mediated mechanism. Muscle Nerve 2002; 26: 70812.
  • 30
    Tucker KJ, Hodges PW. Motoneurone recruitment is altered with pain induced in non-muscular tissue. Pain 2009; 141: 1515.
  • 31
    Henriksen M, Alkjaer T, Lund H, Simonsen EB, Graven-Nielsen T, Danneskiold-Samsoe B, et al. Experimental quadriceps muscle pain impairs knee joint control during walking. J Appl Physiol 2007; 103: 1329.
  • 32
    Henriksen M, Alkjaer T, Simonsen EB, Bliddal H. Experimental muscle pain during a forward lunge: the effects on knee joint dynamics and EMG activity. Br J Sports Med 2008. E-pub ahead of print.
  • 33
    Hodges PW, Mellor R, Crossley K, Bennell K. Pain induced by injection of hypertonic saline into the infrapatellar fat pad and effect on coordination of the quadriceps muscles. Arthritis Rheum 2009; 61: 707.
  • 34
    Wolfe F, Hawley DJ, Goldenberg DL, Russell IJ, Buskila D, Neumann L. The assessment of functional impairment in fibromyalgia (FM): Rasch analyses of 5 functional scales and the development of the FM Health Assessment Questionnaire. J Rheumatol 2000; 27: 198999.
  • 35
    Mease PJ, Clauw DJ, Arnold LM, Goldenberg DL, Witter J, Williams DA, et al. Fibromyalgia syndrome. J Rheumatol 2005; 32: 22707.
  • 36
    Wolfe F, Smythe HA, Yunus MB, Bennett RM, Bombardier C, Goldenberg DL, et al. The American College of Rheumatology 1990 criteria for the classification of fibromyalgia: report of the Multicenter Criteria Committee. Arthritis Rheum 1990; 33: 16072.
  • 37
    Clauw DJ, Crofford LJ. Chronic widespread pain and fibromyalgia: what we know, and what we need to know. Best Pract Res Clin Rheumatol 2003; 17: 685701.
  • 38
    Schnohr P, Jensen G, Lange P, Scharling H, Appleyard M. The Copenhagen City Heart Study: tables with data from the third examination 1991-1994. Eur Heart J 2001; 3 Suppl H: H183.
  • 39
    Bennett R. The Fibromyalgia Impact Questionnaire (FIQ): a review of its development, current version, operating characteristics and uses. Clin Exp Rheumatol 2005; 23(5 Suppl 39 ): S15462.
  • 40
    Burckhardt CS, Clark SR, Bennett RM. The Fibromyalgia Impact Questionnaire: development and validation. J Rheumatol 1991; 18: 72833.
  • 41
    Lund H, Sondergaard K, Zachariassen T, Christensen R, Bulow P, Henriksen M, et al. Learning effect of isokinetic measurements in healthy subjects, and reliability and comparability of Biodex and Lido dynamometers. Clin Physiol Funct Imaging 2005; 25: 7582.
  • 42
    Feiring DC, Ellenbecker TS, Derscheid GL. Test-retest reliability of the Biodex isokinetic dynamometer. J Orthop Sports Phys Ther 1990; 11: 298300.
  • 43
    McNair PJ, Depledge J, Brettkelly M, Stanley SN. Verbal encouragement: effects on maximum effort voluntary muscle action. Br J Sports Med 1996; 30: 2435.
  • 44
    Kim HJ. Effectiveness of visual feedback during isokinetic exercise. J Orthop Sports Phys Ther 1997; 26: 31823.
  • 45
    Miller TA, Allen GM, Gandevia SC. Muscle force, perceived effort, and voluntary activation of the elbow flexors assessed with sensitive twitch interpolation in fibromyalgia. J Rheumatol 1996; 23: 16217.
  • 46
    Hazard RG, Reid S, Fenwick J, Reeves V. Isokinetic trunk and lifting strength measurements: variability as an indicator of effort. Spine 1988; 13: 547.
  • 47
    Luoto S, Hupli M, Alaranta H, Hurri H. Isokinetic performance capacity of trunk muscles: part II. Coefficient of variation in isokinetic measurement in maximal effort and in submaximal effort. Scand J Rehabil Med 1996; 28: 20710.
  • 48
    Jacobsen S, Danneskiold-Samsoe B. Inter-relations between clinical parameters and muscle function in patients with primary fibromyalgia. Clin Exp Rheumatol 1989; 7: 4938.
  • 49
    Kalyan-Raman UP, Kalyan-Raman K, Yunus MB, Masi AT. Muscle pathology in primary fibromyalgia syndrome: a light microscopic, histochemical and ultrastructural study. J Rheumatol 1984; 11: 80813.
  • 50
    Chu LW, Pei CK, Chiu A, Liu K, Chu MM, Wong S, et al. Risk factors for falls in hospitalized older medical patients. J Gerontol A Biol Sci Med Sci 1999; 54: M3843.
  • 51
    Jones KD, Horak FB, Winters-Stone K, Irvine JM, Bennett RM. Fibromyalgia is associated with impaired balance and falls. J Clin Rheumatol 2009; 15: 1621.