Viscoelastic properties and flexibility of the human muscle-tendon unit in benign joint hypermobility syndrome

S P Magnusson, C Julsgaard, P Aagaard, C Zacharie, S Ullman, T Kobayasi, M Kjaer

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Resumé

OBJECTIVE: To examine the passive energy absorption of the hamstring muscle-tendon unit in 9 women with benign joint hypermobility syndrome (BJHS) and 9 age and sex matched controls.

METHODS: Resistance to stretch was measured as knee flexion moment (N.m) with an isokinetic dynamometer during passive knee extension. The angle that induced a stretch sensation without pain was the maximal stretch angle. Force, angle, angular velocity (0.09 rad/s), and electromyograph were simultaneously and continuously recorded during the stretch. Hamstring cross sectional area was obtained with magnetic resonance imaging.

RESULTS: Forearm skin extensibility was greater for BJHS (3.6+/-0.5 cm) than for controls (1.3+/-0.2 cm) (p < 0.01). Similarly, the Beighton score was greater for BJHS (6.6+/-0.8) than for controls (0.4+/-0.2) (p < 0.001). Maximal stretch angle was greater for BJHS (delta1.35+/-0.07 rad) compared to controls (delta0.98+/-0.05 rad) (p < 0.001), and the corresponding peak moment was also greater for BJHS (1.3+/-0.4 Nm/cm2) than for controls (0.6+/-0.1 Nm/cm2) (p < 0.01). For a given mutual angle the passive energy absorption was the same for both groups, but at the maximal stretch angle the total area-normalized energy was greater for BJHS (0.36+/-0.04 J/cm2) than for controls (0.18+/-0.28 J/cm2) (p < 0.001).

CONCLUSION: The lack of difference in passive energy absorption for a given mutual stretch angle suggests that passive properties of the muscle-tendon unit of BJHS are similar to those of controls. However, the greater maximal stretch angle and corresponding peak moment in BJHS suggests a greater subjective tolerance to passive stretch. That is, increased flexibility in BJHS is not a function of altered passive properties of the muscle-tendon complex. It remains unknown if the enhanced tolerance to passive tension plays a role in the development of musculoskeletal ailment.

OriginalsprogEngelsk
TidsskriftJournal of Rheumatology
Vol/bind28
Udgave nummer12
Sider (fra-til)2720-2725
ISSN0315-162X
StatusUdgivet - dec. 2001
Udgivet eksterntJa

Fingeraftryk

Joint Instability
Muscles
Knee
Forearm
Skin

Citer dette

Magnusson, S. P., Julsgaard, C., Aagaard, P., Zacharie, C., Ullman, S., Kobayasi, T., & Kjaer, M. (2001). Viscoelastic properties and flexibility of the human muscle-tendon unit in benign joint hypermobility syndrome. Journal of Rheumatology, 28(12), 2720-2725.
Magnusson, S P ; Julsgaard, C ; Aagaard, P ; Zacharie, C ; Ullman, S ; Kobayasi, T ; Kjaer, M. / Viscoelastic properties and flexibility of the human muscle-tendon unit in benign joint hypermobility syndrome. I: Journal of Rheumatology. 2001 ; Bind 28, Nr. 12. s. 2720-2725.
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title = "Viscoelastic properties and flexibility of the human muscle-tendon unit in benign joint hypermobility syndrome",
abstract = "OBJECTIVE: To examine the passive energy absorption of the hamstring muscle-tendon unit in 9 women with benign joint hypermobility syndrome (BJHS) and 9 age and sex matched controls.METHODS: Resistance to stretch was measured as knee flexion moment (N.m) with an isokinetic dynamometer during passive knee extension. The angle that induced a stretch sensation without pain was the maximal stretch angle. Force, angle, angular velocity (0.09 rad/s), and electromyograph were simultaneously and continuously recorded during the stretch. Hamstring cross sectional area was obtained with magnetic resonance imaging.RESULTS: Forearm skin extensibility was greater for BJHS (3.6+/-0.5 cm) than for controls (1.3+/-0.2 cm) (p < 0.01). Similarly, the Beighton score was greater for BJHS (6.6+/-0.8) than for controls (0.4+/-0.2) (p < 0.001). Maximal stretch angle was greater for BJHS (delta1.35+/-0.07 rad) compared to controls (delta0.98+/-0.05 rad) (p < 0.001), and the corresponding peak moment was also greater for BJHS (1.3+/-0.4 Nm/cm2) than for controls (0.6+/-0.1 Nm/cm2) (p < 0.01). For a given mutual angle the passive energy absorption was the same for both groups, but at the maximal stretch angle the total area-normalized energy was greater for BJHS (0.36+/-0.04 J/cm2) than for controls (0.18+/-0.28 J/cm2) (p < 0.001).CONCLUSION: The lack of difference in passive energy absorption for a given mutual stretch angle suggests that passive properties of the muscle-tendon unit of BJHS are similar to those of controls. However, the greater maximal stretch angle and corresponding peak moment in BJHS suggests a greater subjective tolerance to passive stretch. That is, increased flexibility in BJHS is not a function of altered passive properties of the muscle-tendon complex. It remains unknown if the enhanced tolerance to passive tension plays a role in the development of musculoskeletal ailment.",
keywords = "Adult, Electromyography, Female, Humans, Isotonic Contraction/physiology, Joint Instability/physiopathology, Muscle, Skeletal/physiopathology, Pliability, Syndrome, Tendons/physiopathology, Weight-Bearing",
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Magnusson, SP, Julsgaard, C, Aagaard, P, Zacharie, C, Ullman, S, Kobayasi, T & Kjaer, M 2001, 'Viscoelastic properties and flexibility of the human muscle-tendon unit in benign joint hypermobility syndrome', Journal of Rheumatology, bind 28, nr. 12, s. 2720-2725.

Viscoelastic properties and flexibility of the human muscle-tendon unit in benign joint hypermobility syndrome. / Magnusson, S P; Julsgaard, C; Aagaard, P; Zacharie, C; Ullman, S; Kobayasi, T; Kjaer, M.

I: Journal of Rheumatology, Bind 28, Nr. 12, 12.2001, s. 2720-2725.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Viscoelastic properties and flexibility of the human muscle-tendon unit in benign joint hypermobility syndrome

AU - Magnusson, S P

AU - Julsgaard, C

AU - Aagaard, P

AU - Zacharie, C

AU - Ullman, S

AU - Kobayasi, T

AU - Kjaer, M

PY - 2001/12

Y1 - 2001/12

N2 - OBJECTIVE: To examine the passive energy absorption of the hamstring muscle-tendon unit in 9 women with benign joint hypermobility syndrome (BJHS) and 9 age and sex matched controls.METHODS: Resistance to stretch was measured as knee flexion moment (N.m) with an isokinetic dynamometer during passive knee extension. The angle that induced a stretch sensation without pain was the maximal stretch angle. Force, angle, angular velocity (0.09 rad/s), and electromyograph were simultaneously and continuously recorded during the stretch. Hamstring cross sectional area was obtained with magnetic resonance imaging.RESULTS: Forearm skin extensibility was greater for BJHS (3.6+/-0.5 cm) than for controls (1.3+/-0.2 cm) (p < 0.01). Similarly, the Beighton score was greater for BJHS (6.6+/-0.8) than for controls (0.4+/-0.2) (p < 0.001). Maximal stretch angle was greater for BJHS (delta1.35+/-0.07 rad) compared to controls (delta0.98+/-0.05 rad) (p < 0.001), and the corresponding peak moment was also greater for BJHS (1.3+/-0.4 Nm/cm2) than for controls (0.6+/-0.1 Nm/cm2) (p < 0.01). For a given mutual angle the passive energy absorption was the same for both groups, but at the maximal stretch angle the total area-normalized energy was greater for BJHS (0.36+/-0.04 J/cm2) than for controls (0.18+/-0.28 J/cm2) (p < 0.001).CONCLUSION: The lack of difference in passive energy absorption for a given mutual stretch angle suggests that passive properties of the muscle-tendon unit of BJHS are similar to those of controls. However, the greater maximal stretch angle and corresponding peak moment in BJHS suggests a greater subjective tolerance to passive stretch. That is, increased flexibility in BJHS is not a function of altered passive properties of the muscle-tendon complex. It remains unknown if the enhanced tolerance to passive tension plays a role in the development of musculoskeletal ailment.

AB - OBJECTIVE: To examine the passive energy absorption of the hamstring muscle-tendon unit in 9 women with benign joint hypermobility syndrome (BJHS) and 9 age and sex matched controls.METHODS: Resistance to stretch was measured as knee flexion moment (N.m) with an isokinetic dynamometer during passive knee extension. The angle that induced a stretch sensation without pain was the maximal stretch angle. Force, angle, angular velocity (0.09 rad/s), and electromyograph were simultaneously and continuously recorded during the stretch. Hamstring cross sectional area was obtained with magnetic resonance imaging.RESULTS: Forearm skin extensibility was greater for BJHS (3.6+/-0.5 cm) than for controls (1.3+/-0.2 cm) (p < 0.01). Similarly, the Beighton score was greater for BJHS (6.6+/-0.8) than for controls (0.4+/-0.2) (p < 0.001). Maximal stretch angle was greater for BJHS (delta1.35+/-0.07 rad) compared to controls (delta0.98+/-0.05 rad) (p < 0.001), and the corresponding peak moment was also greater for BJHS (1.3+/-0.4 Nm/cm2) than for controls (0.6+/-0.1 Nm/cm2) (p < 0.01). For a given mutual angle the passive energy absorption was the same for both groups, but at the maximal stretch angle the total area-normalized energy was greater for BJHS (0.36+/-0.04 J/cm2) than for controls (0.18+/-0.28 J/cm2) (p < 0.001).CONCLUSION: The lack of difference in passive energy absorption for a given mutual stretch angle suggests that passive properties of the muscle-tendon unit of BJHS are similar to those of controls. However, the greater maximal stretch angle and corresponding peak moment in BJHS suggests a greater subjective tolerance to passive stretch. That is, increased flexibility in BJHS is not a function of altered passive properties of the muscle-tendon complex. It remains unknown if the enhanced tolerance to passive tension plays a role in the development of musculoskeletal ailment.

KW - Adult

KW - Electromyography

KW - Female

KW - Humans

KW - Isotonic Contraction/physiology

KW - Joint Instability/physiopathology

KW - Muscle, Skeletal/physiopathology

KW - Pliability

KW - Syndrome

KW - Tendons/physiopathology

KW - Weight-Bearing

M3 - Journal article

C2 - 11764223

VL - 28

SP - 2720

EP - 2725

JO - Journal of Rheumatology

JF - Journal of Rheumatology

SN - 0315-162X

IS - 12

ER -

Magnusson SP, Julsgaard C, Aagaard P, Zacharie C, Ullman S, Kobayasi T et al. Viscoelastic properties and flexibility of the human muscle-tendon unit in benign joint hypermobility syndrome. Journal of Rheumatology. 2001 dec;28(12):2720-2725.