Intraexaminer reliability of hand-held dynamometry in the upper extremity: A systematic review

Archives of Physical Medicine and Rehabilitation

Volumn 95, Issue 12, 2014, Pages 2444-2469

  Schrama, Patrick P M ^a,b   Stenneberg, Martijn S ^b   Lucas, Cees ^c   Van Trijffel, Emiel ^b,c  

^a Private practice Leidsevaart   (Netherlands)

^b Stichting Opleiding Musculoskeletal Therapie (SOMT)   (Netherlands)

^c UNIVERSITY OF AMSTERDAM   (Netherlands)

Author keywords

Extremities; Isometric contraction; Muscle strength dynamometer; Observer variation; Rehabilitation; Reproducibility of results

Indexed keywords

ABDUCTION; ARM; CHRONIC OBSTRUCTIVE LUNG DISEASE; DIABETES MELLITUS; DYNAMOMETRY; ELBOW; ELBOW FLEXION; HAND HELD DYNAMOMETRY; HUMAN; IMMOBILITY; INTRARATER RELIABILITY; MALIGNANT NEOPLASTIC DISEASE; MUSCLE STRENGTH; NECK PAIN; PHYSICAL THERAPY STUDENT; REVIEW; ROTATION; SHOULDER; SHOULDER PAIN; TORQUE; WRIST; DYNAMOMETER; OBSERVER VARIATION; PHYSIOLOGY; REPRODUCIBILITY; SKELETAL MUSCLE;

ELBOW JOINT; HUMANS; MUSCLE STRENGTH; MUSCLE STRENGTH DYNAMOMETER; MUSCLE, SKELETAL; OBSERVER VARIATION; REPRODUCIBILITY OF RESULTS; SHOULDER JOINT; UPPER EXTREMITY; WRIST JOINT;

EID: 84922480820     PISSN: 00039993     EISSN: 1532821X     Source Type: Journal    
DOI: 10.1016/j.apmr.2014.05.019     Document Type: Review

References (120)

1. Quin L, Gordon J. Documentation for rehabilitation: A guide to clinical decision making. 2nd ed. Maryland Heights: Saunders; 2010.
2. Berrymann Reese N. Muscle and sensory testing. 3rd ed. St. Louis: Saunders; 2012.
3. Awad H, Alghadir A. Validation of the comprehensive International Classification of Functioning, Disability and Health core set for diabetes mellitus: Physical therapists' perspectives. Am J Phys Med Rehabil 2013; 92: 968-79.
4. Jobst A, Kirchberger I, Cieza A, Stucki G, Stucki A. Content validity of the comprehensive ICF Core Set for chronic obstructive pulmonary diseases: An international Delphi survey. Open Respir Med J 2013; 7: 33-45.
5. Lofgren M, Ekholm J, Broman L, Njoo P, Schult ML. Using a profile of a modified Brief ICF Core Set for chronic widespread musculoskeletal pain with qualifiers for baseline assessment in interdisciplinary pain rehabilitation. J Multidiscip Healthc 2013; 6: 311-21.
6. Hopman K, Krahe L, Lukersmith S, McColl AR, Vine K. Clinical practice guidelines for the management of rotator cuff syndrome in the workplace. Available at: Http://rcs.med.unsw.edu.au/sites/default/files/rcs/page/RotatorCuffSyndromeGuidelines.pdf. Accessed April 14, 2014.
7. Hanchard N, Cummins J, Jeffries C. Evidence-based clinical guidelines for the diagnosis, assessment and physiotherapy management of shoulder impingement syndrome. Chartered Society of Physiotherapy. London; 2004.
8. Eriks-Hoogland IE, Brinkhof MW, Al-Khodairy A, et al. Measuring body structures and body functions from the International Classification of Functioning, Disability, and Health perspective: Considerations for biomedical parameters in spinal cord injury research. Am J Phys Med Rehabil 2011; 90(11 Suppl 2): S50-65.
9. Bohannon RW. Measuring knee extensor muscle strength. Am J Phys Med Rehabil 2001; 80: 13-8.
10. Hayes K, Walton JR, Szomor ZL, Murrell GA. Reliability of 3 methods for assessing shoulder strength. J Shoulder Elbow Surg 2002; 11: 33-9.
11. Noreau L, Vachon J. Comparison of three methods to assess muscular strength in individuals with spinal cord injury. Spinal Cord 1998; 36: 716-23.
12. Trudelle-Jackson E, Jackson AW, Frankowski CM, Long KM, Meske NB. Interdevice reliability and validity assessment of the Nicholas Hand-Held Dynamometer. J Orthop Sports Phys Ther 1994; 20: 302-6.
13. Sisto SA, Dyson-Hudson T. Dynamometry testing in spinal cord injury. J Rehabil Res Dev 2007; 44: 123-6.
14. Suomi R, Surburg PR, Lecius P. Reliability of isokinetic and isometric measurement of leg strength on men with mental retardation. Arch Phys Med Rehabil 1993; 74: 848-52.
15. Leggin BG, Neuman RM, Iannotti JP, Williams GR, Thompson EC. Intrarater and interrater reliability of three isometric dynamometers in assessing shoulder strength. J Shoulder Elbow Surg 1996; 5: 18-24.
16. Stark T, Walker B, Phillips JK, Fejer R, Beck R. Hand-held dynamometry correlation with the gold standard isokinetic dynamometry: A systematic review. PM R 2011; 3: 472-9.
17. Bohannon RW. Muscle strength testing with hand-held dynamometers. In: Amundsen LR, editor. Muscle strength testing. New York: Churchill Livingstone; 1990. p 69-88.
18. Bohannon RW. Make tests and break tests of elbow flexor muscle strength. Phys Ther 1988; 68: 193-4.
19. van der Ploeg RJ, Oosterhuis HJ. The "make/break test" as a diagnostic tool in functional weakness. J Neurol Neurosurg Psychiatry 1991; 54: 248-51.
20. de Vet HC, Terwee CB, Knol DL, Bouter LM. When to use agreement versus reliability measures. J Clin Epidemiol 2006; 59: 1033-9.
21. Beattie P, Dowda M, Turner C, Michener L, Nelson R. Longitudinal continuity of care is associated with high patient satisfaction with physical therapy. Phys Ther 2005; 85: 1046-52.
22. Streiner DL, Norman GR. Health measurement scales. 4th ed. New York: Oxford Univ Pr; 2008.
23. Kolber MJ, Cleland JA. Strength testing using hand-held dynamometry. Phys Ther Rev 2005; 10: 99-112.
24. Moher D, Liberati A, Tetzlaff J, Altman DG. Preferred reporting items for systematic reviews and meta-Analyses: The PRISMA statement. J Clin Epidemiol 2009; 62: 1006-12.
25. Beshay N, Lam PH, Murrell AC. Assessing the reliability of shoulder strength measurement hand-held versus fixed dynamometry. Shoulder Elbow 2011; 3: 244-51.
26. Whiting PF, Rutjes AW, Westwood ME, et al. QUADAS-2: A revised tool for the quality assessment of diagnostic accuracy studies. Ann Intern Med 2011; 155: 529-36.
27. Bossuyt PM, Reitsma JB, Bruns DE, et al. The STARD statement for reporting studies of diagnostic accuracy: Explanation and elaboration. Clin Chem 2003; 49: 7-18.
28. Bossuyt PM, Reitsma JB, Bruns DE, et al. Towards complete and accurate reporting of studies of diagnostic accuracy: The STARD initiative. Fam Pract 2004; 21: 4-10.
29. Lucas NP, Macaskill P, Irwig L, Bogduk N. The development of a quality appraisal tool for studies of diagnostic reliability (QAREL). J Clin Epidemiol 2010; 63: 854-61.
30. van Trijffel E, Anderegg Q, Bossuyt PM, Lucas C. Inter-examiner reliability of passive assessment of intervertebral motion in the cervical and lumbar spine: A systematic review. Man Ther 2005; 10: 256-69.
31. van de Pol RJ, van Trijffel E, Lucas C. Inter-rater reliability for measurement of passive physiological range of motion of upper extremity joints is better if instruments are used: A systematic review. J Physiother 2010; 56: 7-17.
32. van Trijffel E, van de Pol RJ, Oostendorp RA, Lucas C. Inter-rater reliability for measurement of passive physiological movements in lower extremity joints is generally low: A systematic review. J Physiother 2010; 56: 223-35.
33. Hebert JJ, Koppenhaver SL, Parent EC, Fritz JM. A systematic review of the reliability of rehabilitative ultrasound imaging for the quantitative assessment of the abdominal and lumbar trunk muscles. Spine (Phila Pa 1976) 2009; 34: E848-56.
34. Brink Y, Louw QA. Clinical instruments: Reliability and validity critical appraisal. J Eval Clin Pract 2011: 1-7.
35. Lohr KN, Aaronson NK, Alonso J, et al. Evaluating quality-of-life and health status instruments: Development of scientific review criteria. Clin Ther 1996; 18: 979-92.
36. Gwet KL. Intrarater reliability. Wiley encyclopedia of clinical trials. Wiley; 2008. p 1-14. DOI: 10.1002/9780471462422.eoct631. Available at http://www.agreestat.com/research-papers/wiley-encyclopedia2008-eoct631.pdf. Accessed April 14, 2014.
37. Portney LG, Watkins MP. Reliability. In: Foundation of clinical research applications to practice. 2nd ed. Upper Saddle River: Prentice-Hall; 2000. p 61-77.
38. Kottner J, Audige L, Brorson S, et al. Guidelines for Reporting Reliability and Agreement Studies (GRRAS) were proposed. J Clin Epidemiol 2011; 64: 96-106.
39. Bohannon R. Hand-held compared with isokinetic dynamometry for measurement of static knee extension torque (parallel reliability of dynamometers). Clin Phys Physiol Meas 1990; 11: 217-22.
40. Hebert LJ, Maltais DB, Lepage C, Saulnier J, Crete M, Perron M. Isometric muscle strength in youth assessed by hand-held dynamometry: A feasibility, reliability, and validity study. Pediatr Phys Ther 2011; 23: 289-99.
41. Seagraves FE, Horvat M. Comparison of isometric test procedures to assess muscular strength in elementary school girls. Pediatr Exerc Sci 1995; 7: 61-8.
42. Verschuren O, Ketelaar M, Takken T, Van Brussel M, Helders PJ, Gorter JW. Reliability of hand-held dynamometry and functional strength tests for the lower extremity in children with cerebral palsy. Disabil Rehabil 2008; 30: 1358-66.
43. Eek MN, Kroksmark AK, Beckung E. Isometric muscle torque in children 5 to 15 years of age: Normative data. Arch Phys Med Rehabil 2006; 87: 1091-9.
44. Riddle DL, Finucane SD, Rothstein JM, Walker ML. Intrasession and intersession reliability of hand-held dynamometer measurements taken on brain-damaged patients. Phys Ther 1989; 69: 182-9.
45. Hedengren E, Knutson LM, Haglund-Akerlind Y, Hagelberg S. Lower extremity isometric joint torque in children with juvenile chronic arthritis. Scand J Rheumatol 2001; 30: 69-76.
46. Zwerver J, Folgering HThM. The reproducibility of hand-held dynamometry in patients with lung function disorders. Geneeskd Sport 2000; 33: 23-30.
47. Agre J, Magness J, Hull S, et al. Strength testing with a portable dynamometerdreliability for upper and lower extremities. Arch Phys Med Rehabil 1987; 68: 454-8.
48. Andrews A, Thomas M, Bohannon R. Normative values for isometric muscle force measurements obtained with hand-held dynamometers. Phys Ther 1996; 76: 248-59.
49. Aswegen H, Eales CJ, Richards GA. Establishing the reliability of the test procedure in order to investigate the effect of penetrating trunk trauma and prolonged mechanical ventilation on recovery of adult survivors. S Afr J Physiother 2007; 63: 22-7.
50. Balogun JA, Powell R, Trullender B, Olson S, Balogun AO. Intraand inter-Tester reliability of the Nicholas hand-held dynamometer during evaluations of upper extremity isometric muscle strength. Eur J Phys Rehabil Med 1998; 8: 48-53.
51. Beissner K, Collins J, Holmes H. Muscle force and range of motion as predictors of function in older adults. Phys Ther 2000; 80: 556-63.
52. Bohannon R. Interday stability and validity of hand held dynamometer measurements obtained at bedside. J Phys Ther Sci 1993; 5: 61-6.
53. Bohannon RW. Reference values for extremity muscle strength obtained by hand-held dynamometry from adults aged 20 to 79 years. Arch Phys Med Rehabil 1997; 78: 26-32.
54. Bohannon RW, Endemann N. Magnitude and reliability of the handheld dynamometer measurements within and between days. Physiother Theory Pract 1989; 5: 177-81.
55. Bohannon RW, Saunders N. Hand-held dynamometry: A single trial may be adequate for measuring muscle strength in healthy individuals. Physiotherapy Can 1990; 42: 6-9.
56. Bohannon RW, Lusardi MM. Modified sphygmomanometer versus strain gauge hand-held dynamometer. Arch Phys Med Rehabil 1991; 72: 911-4.
57. Burnham RS, Bell G, Olenik L, Reid DC. Shoulder abduction strength measurement in football players: Reliability and validity of two field tests. Clin J Sport Med 1995; 5: 90-4.
58. Byl NN, Richards S, Asturias J. Intrarater and interrater reliability of strength measurements of the biceps and deltoid using a hand held dynamometer. J Orthop Sports Phys Ther 1988; 9: 399-405.
59. Cadogan A, Laslett M, HingW, McNair P, Williams M. Reliability of a new hand-held dynamometer in measuring shoulder range of motion and strength. Man Ther 2011; 16: 97-101.
60. Dawson C, Croce R, Quinn T, Vroman N. Reliability of the Nicholas Manual Muscle Tester on upper body strength in children ages 8-10. Pediatr Exerc Sci 1992; 4: 340-50.
61. Donatelli R, Ellenbecker TS, Ekedahl SR, Wilkes JS, Kocher K, Adam J. Assessment of shoulder strength in professional baseball pitchers. J Orthop Sports Phys Ther 2000; 30: 544-51.
62. Gajdosik CG. Ability of very young children to produce reliable isometric force measurements. Pediatr Phys Ther 2005; 17: 251-7.
63. Grooten WJ, Ang BO. Reliability of measurements of wrist extension force obtained with a Nicholas Manual Muscle Tester (NMMT). Physiother Theory Pract 2010; 26: 281-7.
64. Horvat M, McManis BG, Seagreaves FE. Reliability and objectivity of the Nicholas manual muscle tester with children. Isokinet Exerc Sci 1992; 2: 175-81.
65. Johansson KM, Adolfsson LE. Intraobserver and interobserver reliability for the strength test in the Constant-Murley shoulder assessment. J Shoulder Elbow Surg 2005; 14: 273-8.
66. Kilmer DD, McCrory MA, Wright NC, Rosko RA, Kim HR, Aitkens SG. Hand-held dynamometry reliability in persons with neuropathic weakness. Arch Phys Med Rehabil 1997; 78: 1364-8.
67. Kimura IF, Jefferson LM. Intra-And intertester reliability of Chatillon and MicroFet hand-held dynamometers in measuring force production. J Sport Rehabil 1996; 5: 197-205.
68. van Langeveld SHB, Aufdemkampe G, van Asbeck FWA. Reliability of force measurement with a hand-held dynamometer in healthy subjects and force measurements in patients with poliomyelitis anterior acuta. J Rehabil Sci 1996; 9: 2-10.
69. Magnusson SP, Gleim GW, Nicholas JA. Subject variability of shoulder abduction strength testing. Am J Sports Med 1990; 18: 349-53.
70. Marshall J, Kramer J. Isometric strength of the scapular retractor and protractor muscles of healthy females. Physiother Can 1998; 50: 291-8.
71. McMahon LM, Burdett R, Whitney SL. Effects of muscle group and placement site on reliability of hand-held dynamometry strength measurements. J Orthop Sports Phys Ther 1992; 15: 236-42.
72. Merolla G, De Santis E, Campi F, Paladini P, Porcellini G. Infraspinatus scapular retraction test: A reliable and practical method to assess infraspinatus strength in overhead athletes with scapular dyskinesis. J Orthop Traumatol 2010; 11: 105-10.
73. Michener LA, Boardman ND, Pidcoe PE, Frith AM. Scapular muscle tests in subjects with shoulder pain and functional loss: Reliability and construct validity. Phys Ther 2005; 85: 1128-38.
74. O'Shea SD, Taylor NF, Paratz JD. Measuring muscle strength for people with chronic obstructive pulmonary disease: Retest reliability of hand-held dynamometry. Arch Phys Med Rehabil 2007; 88: 32-6.
75. Ottenbacher KJ, Branch LG, Ray L, Gonzales VA, Peek MK, Hinman MR. The reliability of upper-And lower-extremity strength testing in a community survey of older adults. Arch Phys Med Rehabil 2002; 83: 1423-7.
76. Petersen SM, Wyatt SN. Lower trapezius muscle strength in individuals with unilateral neck pain. J Orthop Sports Phys Ther 2011; 41: 260-5.
77. Phillips BA, Lo SK, Mastaglia FL. Muscle force measured using "break" testing with a hand-held myometer in normal subjects aged 20 to 69 years. Arch Phys Med Rehabil 2000; 81: 653-61.
78. Puharic BS, Bohannon RW. Measurement of forearm pronation and supination strength with a hand-held dynamometer. Isokinet Exerc Sci 1993; 3: 202-6.
79. Rex Wong YC, Cameron D, Bohannon RW. Elbow and hand muscle strength are not affected by head-neck position. Isokinet Exerc Sci 1998; 7: 43-7.
80. Richardson J, Stratford P, Cripps D. Clinical technical note. Assessment of reliability of the hand-held dynamometer for measuring strength in healthy older adults. Physiother Theory Pract 1998; 14: 49-54.
81. Richardson J, Stratford P, DePaul V, Chisholm K, Balsor B. A multirater reliability study of isometric elbow strength in healthy adults. Physiother Can 1997; 49: 178-84.
82. Riemann BL, Davies GJ, Ludwig L, Gardenhour H. Hand-held dynamometer testing of the internal and external rotator musculature based on selected positions to establish normative data and unilateral ratios. J Shoulder Elbow Surg 2010; 19: 1175-83.
83. Siatras TA, Douka ID, Milosis DC. Feasibility and reproducibility of muscular strength measures in gymnastics-specific body positions using hand-held dynamometry. Isokinet Exerc Sci 2010; 18: 223-34.
84. Sole G, Wright L, Wassinger C, et al. Reliability of hand-held dynamometric strength testing in people with diabetes/chronic conditions. N Z J Physiother 2010; 38: 52-5.
85. Stockton K, Wrigley T, Mengersen K, Kandiah D, Paratz J, Bennell K. Test-retest reliability of hand-held dynamometry and functional tests in systemic lupus erythematosus. Lupus 2011; 20: 144-50.
86. Stratford PW, Balsor BE. A comparison of make and break tests using a hand-held dynamometer and the Kin-Com. J Orthop Sports Phys Ther 1994; 19: 28-32.
87. Stuberg WA, Metcalf WK. Reliability of quantitative muscle testing in healthy children and in children with Duchenne muscular dystrophy using a hand-held dynamometer. Phys Ther 1988; 68: 977-82.
88. Sullivan SJ, Chesley A, Hebert G, McFaull S, Scullion D. The validity and reliability of hand-held dynamometry in assessing isometric external rotator performance. J Orthop Sports Phys Ther 1988; 10: 213-7.
89. Surburg PR, Suomi R, Poppy WK. Validity and reliability of a handheld dynamometer with two populations. J Orthop Sports Phys Ther 1992; 16: 229-34.
90. Toemen A, Dalton S, Sandford F. The intra-And inter-rater reliability of manual muscle testing and a hand-held dynamometer for measuring wrist strength in symptomatic and asymptomatic subjects. Hand Ther 2011; 16: 67-74.
91. Vermeulen HM, de Bock GH, van Houwelingen HC, et al. A comparison of two portable dynamometers in the assessment of shoulder and elbow strength. Physiotherapy 2005; 91: 101-12.
92. Wadsworth CT, Krishnan R, Sear M, Harrold J, Nielsen DH. Intrarater reliability of manual muscle testing and hand-held dynametric muscle testing. Phys Ther 1987; 67: 1342-7.
93. Wikholm JB, Bohannon RW. Hand-held dynamometer measurements: Tester strength makes a difference. J Orthop Sports Phys Ther 1991; 13: 191-8.
94. Zmierski T, Kegerreis S. Scapular muscle strengthening. J Sport Rehabil 1995; 4: 244-52.
95. Colombo R, Mazzini L, Mora G, et al. Measurement of isometric muscle strength: A reproducibility study of maximal voluntary contraction in normal subjects and amyotrophic lateral sclerosis patients. Med Eng Phys 2000; 22: 167-74.
96. Visser J, Mans E, de Visser M, et al. Comparison of maximal voluntary isometric contraction and hand-held dynamometry in measuring muscle strength of patients with progressive lower motor neuron syndrome. Neuromuscul Disord 2003; 13: 744-50.
97. Surburg PR, Suomi R, Poppy WK. Validity and reliability of a handheld dynamometer applied to adults with mental retardation. Arch Phys Med Rehabil 1992; 73: 535-9.
98. Dobson F, Choi YM, Hall M, Hinman RS. Clinimetric properties of observer-Assessed impairment tests used to evaluate hip and groin impairments: A systematic review. Arthritis Care Res (Hoboken) 2012; 64: 1565-75.
99. de Koning CH, van den Heuvel SP, Staal JB, Smits-Engelsman BC, Hendriks EJ. Clinimetric evaluation of methods to measure muscle functioning in patients with non-specific neck pain: A systematic review. BMC Muscoskel Disord 2008; 9: 142.
100. de Koning CH, van den Heuvel SP, Staal JB, Smits-Engelsman BC, Hendriks EJ. Clinimetric evaluation of active range of motion measures in patients with non-specific neck pain: A systematic review. Eur Spine J 2008; 17: 905-21.
101. Burns SP, Spanier DE. Break-Technique handheld dynamometry: Relation between angular velocity and strength measurements. Arch Phys Med Rehabil 2005; 86: 1420-6.
102. Roebroeck ME, Harlaar J, Lankhorst GJ. Reliability assessment of isometric knee extension measurements with a computer-Assisted hand-held dynamometer. Arch Phys Med Rehabil 1998; 79: 442-8.
103. Fransen M, Crosbie J, Edmonds J. Isometric muscle force measurement for clinicians treating patients with osteoarthritis of the knee. Arthritis Rheum 2003; 49: 29-35.
104. Effgen SK, Brown DA. Long-Term stability of hand-held dynamometric measurements in children who have myelomeningocele. Phys Ther 1992; 72: 458-65.
105. Kelln BM, McKeon PO, Gontkof LM, Hertel J. Hand-held dynamometry: Reliability of lower extremity muscle testing in healthy, physically active, young adults. J Sport Rehabil 2008; 17: 160-70.
106. Brinkmann JR. Comparison of a hand-held and fixed dynamometer in measuring strength of patients with neuromuscular disease. J Orthop Sports Phys Ther 1994; 19: 100-4.
107. Hosking JP, Bhat US, Dubowitz V, Edwards RH. Measurements of muscle strength and performance in children with normal and diseased muscle. Arch Dis Child 1976; 51: 957-63.
108. Dyball KM, Taylor NF, Dodd KJ. Retest reliability of measuring hip extensor muscle strength in different testing positions in young people with cerebral palsy. BMC Pediatr 2011; 11: 42.
109. Clarke MN. Intra-Tester and inter-Tester reliability of the MicroFET 3 hand-held dynamometer. Physiother Pract Res 2011; 32: 13-8.
110. Bohannon RW, Andrews AW. Interrater reliability of hand-held dynamometry. Phys Ther 1987; 67: 931-3.
111. Macfarlane TS, Larson CA, Stiller C. Lower extremity muscle strength in 6-To 8-year-old children using hand-held dynamometry. Pediatr Phys Ther 2008; 20: 128-36.
112. Toonstra J, Mattacola CG. Test-retest reliability and validity of isometric knee flexion and extension measurement using three methods of assessing muscle strength. J Sport Rehabil 2012 Sep 4 [Epub ahead of print].
113. Kolber MJ, Beekhuizen K, Cheng MS, Fiebert IM. The reliability of hand-held dynamometry in measuring isometric strength of the shoulder internal and external rotator musculature using a stabilization device. Physiother Theory Pract 2007; 23: 119-24.
114. Kollock RO, Onate JA, Van LB. The reliability of portable fixed dynamometry during hip and knee strength assessments. J Athl Train 2010; 45: 349-56.
115. Bohannon RW, Kindig J, Sabo G, Duni AE, Cram P. Isometric knee extension force measured using a handheld dynamometer with and without belt-stabilization. Physiother Theory Pract 2012; 28: 562-8.
116. Backman E, Odenrick P, Henriksson K, Ledin T. Isometric muscle force and anthropometric values in normal children aged between 3.5 and 15 years. Scand J Rehabil Med 1989; 21: 105-14.
117. Belmonte Martinez R, Samitier Pastor C, Muniesa Portoles J, et al. Reliability of knee muscle strength measurements with manual dynamometry in patients with severe knee arthritis [Spanish]. Rehabilitacion 2009; 43: 218-22.
118. Bohannon RW. Testing isometric limb muscle strength with dynamometers. Crit Rev Phys Rehabil Med 1990; 2: 75-86.
119. Scales CD Jr, Canfield SE. Advanced topics in evidence-based urological oncology: Using results of a subgroup analysis. Urol Oncol 2011; 29: 462-6.
120. Shrout PE, Fleiss JL. Intraclass correlations: Uses in assessing rater reliability. Psychol Bull 1979; 86: 420-8.