Mechanography

Last updated
Mechanography
Purposeassessment of muscle function

Mechanography (also referred to as jumping mechanography or Muscle Mechanography [1] ) is a medical diagnostic measurement method for motion analysis and assessment of muscle function and muscle power by means of physical parameters. The method is based on measuring the variation of the ground reaction forces over the time for motion patterns close to typical every day movements (e.g. chair rise or jumps). From these ground reaction forces centre of gravity related physical parameters like relative maximum forces, velocity, power output, kinetic energy, potential energy, height of jump or whole body stiffness [2] are calculated. If the ground reaction forces are measured separately for left and right leg in addition body imbalances during the motions can be analysed. This enables for example to document the results of therapy. [3] [4] The same methodology can also be used for gait analysis [5] [6] or for analysis of stair climbing, [7] grip strength [8] and Posturography. [9] Due to the utilization of every-day movements reproducibility is high over a wide age range [10]

Contents

Fields of application

Typical fields of applications of Mechanography are in the field of geriatrics [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] [21] [22] especially in the field of Sarcopenia [23] but also for Master Athletes. [24] Mechanography is also used frequently in pediatrics for basic research ins muscle function and growth, [25] [26] [27] [28] [29] [30] [31] [32] [33] reference Data [8] [34] [35] as well as in specific diseases like Prader–Willi syndrome, [36] Obesity, [37] [38] Osteogenesis Imperfecta [39] [40] [41] [42] and cerebral palsy. [43] In opposite to many other established measurements methods like Chair Rising Test, Stand-up and Go test and others [44] [45] the maximum power output relative to body weight during a jump of maximum height measured by Mechanography is a much better reproducible and does not have a training effect even when repeated more frequently. [46]

Based on this test (maximum relative power output of a jump as high as possible) Runge et al. and Schönau et al. defined reference values of a fit population in order to match the individual power output in relation to bodyweight, age and gender [14] [31] Tsubaki [47] [48] showed when using identical selection criteria as Runge that the relative Power of the Japanese population is identical with western European population which delimits the need for localized reference data. Runge et al. also showed the interrelation between the measured individual power output and the neuromuscular caused fall risk. [49]

Due to this objective and highly reproducible quantification of typical every day movements by means of physical parameters the Mechanography is well suited to document the physical state of a person [14] [50] [51] as well as the effects of training or therapy. [3] [17] [38] [52] [53] [54] [55] Because of this it is also one of the standard measurements in recent and current Bed Rest Studies of the European Space Agency (ESA). [53] [56] [57] [58] and the Mars500 Mission. [59]

Mechanography has also been used to explore the relation between muscle and bone. According to the Mechanostat theorem muscle function influences bone growth. By combining functional measurement methods like Mechanography and quantitative computer tomographic measurements analysing bone density, geometry and strength this relationship can be assessed. [28] [60] [61] [62] [63] [64] [13] [65] [66] In sports research Mechanography has been used to assess principle training effects. [67] [21] [68]

Mechanography Devices

The standard Mechanography measurement devices as used in all referenced articles are the Leonardo Mechanograph™ systems supplied by Novotec Medical GmbH, Pforzheim, Germany.

Resources

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  5. Veilleux LN, Robert M, Ballaz L, Lemay M, Rauch F: Gait analysis using a force-measuring gangway: Intrasession repeatability in healthy adults, J Musculoskelet Neuronal Interact., 11(1):27-33, 2011; PMID   21364272
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  8. 1 2 Lang I, Busche P, Rakhimi N, Rawer R, Martin DD.: Mechanography in childhood: references for grip force, multiple one-leg hopping force and whole body stiffness., J Musculoskelet Neuronal Interact., 13(2)::227-35., 2013; PMID   23728109
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  24. Gast U, Belavy DL, Armbrecht G, Kusy K, Lexy H, Rawer R, Rittweger J, Winwood K, Zielinski J, Felsenberg D: Bone density and neuromuscular function in older competitive athletes depend on running distance., Osteoporos Int, 24(7):2033-42, 2013; PMID   23242430
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  32. Veilleux LN, Rauch F, Lemay M, Ballaz L: Agreement between vertical ground reaction force and ground reaction force vector in five common clinical tests., J Musculoskelet Neuronal Interact, 12(4):219-23, 2012; PMID   23196264
  33. Veilleux LN, Rauch F: Reproducibility of jumping mechanography in healthy children and adults, J Musculoskelet Neuronal Interact., 10(4):256-66, 2010; PMID   21116062
  34. Busche P, Rawer R, Rakhimi N, Lang I, Martin DD.: Mechanography in childhood: references for force and power in counter movement jumps and chair rising tests., J Musculoskelet Neuronal Interact., 13(2)::213-26., 2013; PMID   23728108
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<span class="mw-page-title-main">Bruck syndrome</span> Medical condition

Bruck syndrome is characterized as the combination of arthrogryposis multiplex congenita and osteogenesis imperfecta. Both diseases are uncommon, but concurrence is extremely rare which makes Bruck syndrome very difficult to research. Bruck syndrome is thought to be an atypical variant of osteogenesis imperfecta most resembling type III, if not its own disease. Multiple gene mutations associated with osteogenesis imperfecta are not seen in Bruck syndrome. Many affected individuals are within the same family, and pedigree data supports that the disease is acquired through autosomal recessive inheritance. Bruck syndrome has features of congenital contractures, bone fragility, recurring bone fractures, flexion joint and limb deformities, pterygia, short body height, and progressive kyphoscoliosis. Individuals encounter restricted mobility and pulmonary function. A reduction in bone mineral content and larger hydroxyapatite crystals are also detectable Joint contractures are primarily bilateral and symmetrical, and most prone to ankles. Bruck syndrome has no effect on intelligence, vision, or hearing.