Voluntary Activation During Isokinetic Contractions in Subjects with Neuromotor Disorders

NCT04607174 | Recruiting

• 1 other identifier: 24C903
• Study Type: interventional
• Target: 20
• Locations: 1 country
• Sites: 1

Brief Summary

Activation is the amount of voluntary recruitment of a muscle during voluntary contraction. Full activation implies the recruitment of all muscle fibres at their tetanic frequency. In healthy subjects, and even in sports performances, full activation may be rarely achieved despite a subjectively maximal effort. Highly decreased activation has been observed in patients affected by various orthopaedic and neurological disorders. In these subjects, paresis may be caused or aggravated by primitive impairments of the central nervous system and/or, by stimuli arising from peripheral damaged tissues that inhibit the corticospinal or the intraspinal recruitment of motoneurones ("arthrogenous muscle weakness"). There are numerous investigations in the literature on activation measured during isometric contractions, while they are substantially missing as far as isokinetic concentric contractions are concerned. There are reasons to suppose that, contrary to what has been demonstrated for healthy subjects, in patients with various motor impairments the activation is diminished the more, the higher is the joint rotation speed. The present study aims to investigate the amount of activation of the quadriceps femoris during subjectively maximal isometric contractions at 40° knee flexion (0°=complete extension) and isokinetic concentric contractions at an angular velocity of 100°/s in patients with various orthopaedic and neurologic conditions. Activation will be measured on an isokinetic dynamometer, through the "interpolated twitch technique". This consists of stimulating a representative sample of the muscle belly through an electric shock. If the shock does not generate an extra force during contraction, all muscle fibres belonging to the sample reached by the electric shock can be claimed to be recruited at their tetanic frequency. Otherwise, following the stimulus, a twitch can be observed revealing submaximal voluntary recruitment of the muscle.

Conditions

Multiple Sclerosis; Poststroke/CVA Hemiparesis; Parkinson Disease; Knee Impairment

Keywords

voluntary activation; lower limb; interpolated twitch technique; rehabilitation

Outcome Measures

Primary Outcomes (1)

• Voluntary Activation

  Voluntary Activation = \[1 - (Interpolated Twitch/Resting Twitch)\]%, where Interpolated Twitch and Resting Twitch are the peak torques caused by the electric shock during the voluntary contraction and a rest, respectively

  Day 1

Study Arms (1)

Pathologic group

OTHER

At least 20 participants with various neurologic or orthopaedic conditions (for example, hemiparesis post-stroke, multiple sclerosis, traumatic knee injuries, knee osteoarthritis) will be enrolled.

Other: Pathologic group

Interventions

Pathologic group OTHER

Voluntary Activation level will be determined according to the interpolate twitch technique (ITT). During isometric contractions (knee at 40° flexion), three electric shocks (doublets) will be delivered. The first shock will be delivered at rest before contraction. The second one will be delivered 3-4 s after the beginning of the effort. The third one will be delivered at rest 2-3 s after the contraction has ended. Two isometric contractions will be performed, with a 3-minute break. Then, 3 consecutive continuous passive motion (CPM) extension-flexions of the knee joint (range 105-0°), and 3 isokinetic concentric contractions (ISOK) will be performed. During both CPM and ISOK an electric shock will be delivered during each repetition. The instant of stimulation will be determined in a way allowing the twitch moments to peak at exactly 40° of knee flexion during extension. The same procedure will be administered first to the affected limb, and then to the non-affected limb.

Pathologic group

Eligibility Criteria

• Age: 18 Years - 70 Years
• Sex: all
• Healthy Volunteers: No
• Age Groups: Adult (18-64), Older Adult (65+)

You may qualify if:

• age between 18 and 70 years old;
• ability to sign the informed consent form;
• ability to understand the instructions and to complete the motor task;
• voluntary knee flexion-extension range of at least 70°;
• maximal extension of angle \< 30° (0°=full extension, 180° sagittal tibio-femural angle).

You may not qualify if:

• pregnancy;
• a history of epilepsy (to avoid the risk for seizures triggered by the stimuli);
• Mini Mental State Examination ≤27/30;
• implanted electro-sensitive devices;
• any orthopedic condition limiting the articular mobility or muscular strength of the lower limbs;
• current treatment with oral anticoagulant therapy (to avoid the risk for muscle hemorrhage);
• medium/serius osteoporosis (femoral Bone Mineral Density on the affected side, t-score \< (-3.5));
• familiarity with the testing method.

Sponsors & Collaborators

• Istituto Auxologico Italiano: lead

Study Sites (1)

Istituto Auxologico Italiano

Milan, MI, 20121, Italy

RECRUITING

Related Publications (8)

• Babault N, Pousson M, Ballay Y, Van Hoecke J. Activation of human quadriceps femoris during isometric, concentric, and eccentric contractions. J Appl Physiol (1985). 2001 Dec;91(6):2628-34. doi: 10.1152/jappl.2001.91.6.2628.

  PMID: 11717228 BACKGROUND

• Behrens M, Husmann F, Gube M, Felser S, Weippert M, Bruhn S, Zschorlich V, Mau-Moeller A. Intersession reliability of the interpolated twitch technique applied during isometric, concentric, and eccentric actions of the human knee extensor muscles. Muscle Nerve. 2017 Aug;56(2):324-327. doi: 10.1002/mus.25498. Epub 2017 Apr 12.

  PMID: 27935064 BACKGROUND

• Behrens M, Mau-Moeller A, Mueller K, Heise S, Gube M, Beuster N, Herlyn PK, Fischer DC, Bruhn S. Plyometric training improves voluntary activation and strength during isometric, concentric and eccentric contractions. J Sci Med Sport. 2016 Feb;19(2):170-6. doi: 10.1016/j.jsams.2015.01.011. Epub 2015 Feb 4.

  PMID: 25766509 BACKGROUND

• Beltman JG, Sargeant AJ, van Mechelen W, de Haan A. Voluntary activation level and muscle fiber recruitment of human quadriceps during lengthening contractions. J Appl Physiol (1985). 2004 Aug;97(2):619-26. doi: 10.1152/japplphysiol.01202.2003. Epub 2004 Apr 9.

  PMID: 15075302 BACKGROUND

• Fitzgerald GK, Piva SR, Irrgang JJ, Bouzubar F, Starz TW. Quadriceps activation failure as a moderator of the relationship between quadriceps strength and physical function in individuals with knee osteoarthritis. Arthritis Rheum. 2004 Feb 15;51(1):40-8. doi: 10.1002/art.20084.

  PMID: 14872454 BACKGROUND

• Zarkou A, Stackhouse S, Binder-Macleod SA, Lee SCK. Comparison of techniques to determine human skeletal muscle voluntary activation. J Electromyogr Kinesiol. 2017 Oct;36:8-15. doi: 10.1016/j.jelekin.2017.05.011. Epub 2017 Jun 8.

  PMID: 28649011 BACKGROUND

• Wilder MR, Cannon J. Effect of age on muscle activation and twitch properties during static and dynamic actions. Muscle Nerve. 2009 May;39(5):683-91. doi: 10.1002/mus.21233.

  PMID: 19229967 BACKGROUND

• Newham DJ, Hsiao SF. Knee muscle isometric strength, voluntary activation and antagonist co-contraction in the first six months after stroke. Disabil Rehabil. 2001 Jun 15;23(9):379-86. doi: 10.1080/0963828001006656.

  PMID: 11394588 BACKGROUND

MeSH Terms

Conditions

Multiple Sclerosis; Parkinson Disease

Condition Hierarchy (Ancestors)

Demyelinating Autoimmune Diseases, CNS; Autoimmune Diseases of the Nervous System; Nervous System Diseases; Demyelinating Diseases; Autoimmune Diseases; Immune System Diseases; Parkinsonian Disorders; Basal Ganglia Diseases; Brain Diseases; Central Nervous System Diseases; Movement Disorders; Synucleinopathies; Neurodegenerative Diseases

Study Officials

• Luigi Tesio, MD, Full professor

  Istituto Auxologico Italiano

  PRINCIPAL INVESTIGATOR

Central Study Contacts

Luigi Tesio, MD, Full Professor

CONTACT

02 58218717; l.tesio@auxologico.it

Stefano Scarano, MD, Research Fellow

CONTACT

+39 02 58218717; s.scarano@auxologico.it

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: NA
• Masking: NONE
• Purpose: DIAGNOSTIC
• Intervention Model: SINGLE GROUP
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: MD, Director of the Department of Neuromotor Rehabilitation, Ospedale San Luca, Istituto Auxologico Italiano, IRCCS; Full Professor, Department of Biomedical Sciences for Health, Università degli Studi di Milano, Milan, Italy

Study Record Dates

• First Submitted: October 22, 2020
• First Posted: October 29, 2020
• Study Start: October 7, 2020
• Primary Completion: December 31, 2024
• Study Completion: December 31, 2024
• Last Updated: October 24, 2024

Record last verified: 2024-10

Data Sharing

• IPD Sharing: Will share

Locations

IT (1)