Muscle activity in the leg is tuned in response to impact force characteristics

Boyer, Katherine A.; Nigg, Benno M.

doi:10.1016/j.jbiomech.2004.01.002

Cited by 114 publications

(100 citation statements)

References 25 publications

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“…The difference in calf circumference between the arthritic and the contralateral leg suggests that there is muscle atrophy associated with ankle OA, which decreases muscle strength. Knowing that muscles, as shock absorbers, protect the joints from pathological articular peak forces, 36 the decreased muscle strength might accelerate the arthritic process in the lower leg and in turn increase muscle atrophy by disuse (vicious circle).…”

Section: Discussionmentioning

confidence: 99%

Lower leg muscle atrophy in ankle osteoarthritis

et al. 2006

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The aim of this study was to determine changes in the lower leg muscles associated with ankle osteoarthritis. Fifteen unilateral ankle osteoarthritis patients and fifteen age-gender-matched normal subjects were assessed with clinical [osteoarthritis latency time, pain, alignment, AOFAS ankle score, ankle range of motion (ROM), calf circumference], radiological (ankle osteoarthritis grading), and muscular-physiological parameters [isometric maximal voluntary ankle torque, surface electromyography of the anterior tibial (AT), medial gastrocnemius (MG), soleus (SO), and peroneus longus (PL) muscle]. The osteoarthritis patients had increased pain (6.8 points) and reduced AOFAS score (33.7 points) compared to the control group. Compared to the contralateral healthy leg, the arthritic leg showed reduced mean dorsi-/plantar flexion ROM (16.08), reduced mean calf circumference (2.1 cm), smaller mean dorsiflexion (16.4 Nm) and plantar flexion (15.8 Nm) torques, lower mean electromyography frequency for all muscles (AT À22.6 Hz; MG À27.3 Hz; SO À25.9 Hz; PL À28.5 Hz), and lower mean electromyography intensity in the AT [À28.0 Â 10 3 (mv) 2 ], MG [À13.3 Â 10 3 (mv) 2 ], and PL [À12.8 Â 10 3 (mv) 2 ]. SO mean electromyography intensity was not significantly changed [þ2.0 Â 10 3 (mv) 2 ]. Unilateral ankle osteoarthritis is associated with atrophic changes of the lower leg muscles. This study supports previous observations on muscle dysfunction in knee osteoarthritis. ß

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Section: Discussionmentioning

confidence: 99%

Lower leg muscle atrophy in ankle osteoarthritis

et al. 2006

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“…Previous authors have examined muscle tuning, and the ability to minimize soft tissue vibrations experienced after impact (Boyer & Nigg, 2004;Nigg & Liu, 1999;Wakeling & Nigg, 2001a, 2001bWakeling et al, 2001Wakeling et al, , 2003. However, in general, the role that the soft tissues, or wobbling masses, play on tibial responses is largely unknown.…”

Section: Discussionmentioning

confidence: 99%

“…Nigg & Liu (1999) stated that changes in joint stiffness and the coupling between wobbling and rigid masses was partially due to leg muscle activation. The term muscle tuning describes an alteration in muscle activation to minimize soft tissue vibrations experienced after impact (Boyer & Nigg, 2004;Nigg & Liu, 1999;Wakeling & Nigg, 2001a, 2001bWakeling et al, 2001Wakeling et al, , 2003. Shock wave vibrations may be decreased through muscle tuning within lower extremity segments.…”

Section: University Of Windsormentioning

confidence: 99%

“…Shock wave vibrations may be decreased through muscle tuning within lower extremity segments. In past studies, the effect of muscle tuning has been determined by soft tissue vibrations and frequency characteristics measured by accelerometers placed on soft tissue packages (Boyer & Nigg, 2004, Wakeling & Nigg, 2001a, 2001b. However, the effect that systematically manipulating muscle activation levels voluntarily has on tibial response (e.g., peak tibial acceleration, time to peak acceleration, acceleration slope) following impact, has yet to be determined.…”

Section: University Of Windsormentioning

confidence: 99%

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The Effect of Leg Muscle Activation State and Localized Muscle Fatigue on Tibial Response during Impact

Holmes

Andrews

2006

Journal of Applied Biomechanics

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The purpose of this research was to examine the effects of voluntarily manipulating muscle activation and localized muscle fatigue on tibial response parameters, including peak tibial acceleration, time to peak tibial acceleration, and the acceleration slope, measured at the knee during unshod heel impacts. A human pendulum delivered consistent impacts to 15 female and 15 male subjects. The tibialis anterior and lateral gastrocnemius were examined using electromyography, thus allowing voluntary contraction to various activation states (baseline, 15%, 30%, 45%, and 60% of the maximum activation state) and assessing localized muscle fatigue. A skin-mounted uniaxial accelerometer, preloaded medial to the tibial tuberosity, allowed tibial response parameter determination. There were significant decreases in peak acceleration during tibialis anterior fatigue, compared to baseline and all other activation states. In females, increased time to peak acceleration and decreased acceleration slope occurred during fatigue compared to 30% and 45%, and compared to 15% through 60% of the maximum activation state, respectively. Slight peak acceleration and acceleration slope increases, and decreased time to peak acceleration as activation state increased during tibialis anterior testing, were noted. When examining the lateral gastrocnemius, the time to peak acceleration was significantly higher across gender in the middle activation states than at the baseline and fatigue states. The acceleration slope decreased at all activation states above baseline in females, and decreased at 60% of the maximum activation state in males compared to the baseline and fatigue states. Findings agree with localized muscle fatigue literature, suggesting that with fatigue there is decreased impact transmission, which may protect the leg. The relative effects of leg stiffness and ankle angle on tibial response need to be verified.

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“…In this sense, it is interesting to highlight the work by Boyer and Nigg [19], [20], which introduced the idea of muscle tuning before impact. The authors showed that the activation of leg muscles before heel landing was correlated with the vibration of the softtissue compartment and, therefore, to the energy dissipation.…”

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confidence: 99%

Dynamic considerations of heel-strike impact in human gait

et al. 2015

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Based on the impulsive-dynamics formulation, this article presents the analysis of different strategies to regulate the energy dissipation at the heel-strike event in the context of human locomotion. For this purpose, a seven-link 2D human-like multibody model based on anthropometric data is used. The model captures the most relevant dynamic and energetic aspects of the heel-strike event in the sagittal plane. The pre-impact mechanical state of the system, around which the analysis of the heel impact contribution to energy dissipation is performed, is defined based on published data. In the context of the proposed impulsivedynamics framework, different realistic strategies that the subject can apply to modify the impact dynamics are proposed and analyzed, namely, the trailing ankle push-off, the torso configuration and the degree of joint blocking in the colliding leg. Detailed numerical analysis and discussions are presented to quantify the ef- 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 2 Javier Ros et al.fects of the mentioned strategies.

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Muscle activity in the leg is tuned in response to impact force characteristics

Cited by 114 publications

References 25 publications

Lower leg muscle atrophy in ankle osteoarthritis

Lower leg muscle atrophy in ankle osteoarthritis

The Effect of Leg Muscle Activation State and Localized Muscle Fatigue on Tibial Response during Impact

Dynamic considerations of heel-strike impact in human gait

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