Plantarflexor muscle function in healthy and chronic Achilles tendon pain subjects evaluated by the use of EMG and PET imaging
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Plantarflexor muscle function in healthy and chronic Achilles tendon pain subjects evaluated by the use of EMG and PET imaging. / Masood, Tahir; Kalliokoski, Kari; Bojsen-Møller, Jens; Magnusson, S Peter; Finni, Taija.
In: Clinical biomechanics (Bristol, Avon), Vol. 29, No. 5, 2014, p. 564-570.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Plantarflexor muscle function in healthy and chronic Achilles tendon pain subjects evaluated by the use of EMG and PET imaging
AU - Masood, Tahir
AU - Kalliokoski, Kari
AU - Bojsen-Møller, Jens
AU - Magnusson, S Peter
AU - Finni, Taija
N1 - Copyright © 2014 Elsevier Ltd. All rights reserved.
PY - 2014
Y1 - 2014
N2 - BACKGROUND: Achilles tendon pathologies may alter the coordinative strategies of synergistic calf muscles. We hypothesized that both surface electromyography and positron emission tomography would reveal differences between symptomatic and asymptomatic legs in Achilles tendinopathy patients and between healthy controls.METHODS: Eleven subjects with unilateral chronic Achilles tendon pain (28 years) and eleven matched controls (28 years) were studied for triceps surae and flexor hallucis longus muscle activity in response to repetitive isometric plantarflexion tasks performed at 30% of maximal voluntary contraction using surface electromyography and glucose uptake using positron emission tomography. Additionally, Achilles tendon glucose uptake was quantified.FINDINGS: Normalized myoelectric activity of soleus was higher (P<0.05) in the symptomatic leg versus the contralateral and control legs despite lower absolute force level maintained (P<0.005). Electromyography amplitude of flexor hallucis longus was also greater on the symptomatic side compared to the healthy leg (P<0.05). Both the symptomatic and asymptomatic legs tended to have higher glucose uptake compared to the control legs (overall effect size: 0.9 and 1.3, respectively). Achilles tendon glucose uptake was greater in both legs of the patient group (P<0.05) compared to controls. Maximal plantarflexion force was ~14% greater in the healthier leg compared to the injured leg in the patient group.INTERPRETATIONS: While the electromyography showed greater relative amplitude in the symptomatic leg, the results based on muscle glucose uptake suggested relatively similar behavior of both legs in the patient group. Higher glucose uptake in the symptomatic Achilles tendon suggests a higher metabolic demand.
AB - BACKGROUND: Achilles tendon pathologies may alter the coordinative strategies of synergistic calf muscles. We hypothesized that both surface electromyography and positron emission tomography would reveal differences between symptomatic and asymptomatic legs in Achilles tendinopathy patients and between healthy controls.METHODS: Eleven subjects with unilateral chronic Achilles tendon pain (28 years) and eleven matched controls (28 years) were studied for triceps surae and flexor hallucis longus muscle activity in response to repetitive isometric plantarflexion tasks performed at 30% of maximal voluntary contraction using surface electromyography and glucose uptake using positron emission tomography. Additionally, Achilles tendon glucose uptake was quantified.FINDINGS: Normalized myoelectric activity of soleus was higher (P<0.05) in the symptomatic leg versus the contralateral and control legs despite lower absolute force level maintained (P<0.005). Electromyography amplitude of flexor hallucis longus was also greater on the symptomatic side compared to the healthy leg (P<0.05). Both the symptomatic and asymptomatic legs tended to have higher glucose uptake compared to the control legs (overall effect size: 0.9 and 1.3, respectively). Achilles tendon glucose uptake was greater in both legs of the patient group (P<0.05) compared to controls. Maximal plantarflexion force was ~14% greater in the healthier leg compared to the injured leg in the patient group.INTERPRETATIONS: While the electromyography showed greater relative amplitude in the symptomatic leg, the results based on muscle glucose uptake suggested relatively similar behavior of both legs in the patient group. Higher glucose uptake in the symptomatic Achilles tendon suggests a higher metabolic demand.
KW - Achilles Tendon
KW - Adult
KW - Case-Control Studies
KW - Electromyography
KW - Female
KW - Glucose
KW - Humans
KW - Isometric Contraction
KW - Leg
KW - Male
KW - Muscle, Skeletal
KW - Myalgia
KW - Positron-Emission Tomography
KW - Tendinopathy
KW - Young Adult
U2 - 10.1016/j.clinbiomech.2014.03.003
DO - 10.1016/j.clinbiomech.2014.03.003
M3 - Journal article
C2 - 24713192
VL - 29
SP - 564
EP - 570
JO - Clinical Biomechanics
JF - Clinical Biomechanics
SN - 0268-0033
IS - 5
ER -
ID: 138556691