Foot orthoses and aerobic cost

NewsBot · May 10, 2011

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Impact of Orthoses on Changes in Neuromuscular Control and Aerobic Cost of a 1-H Run.
Kelly LA, Girard O, Racinais S.
Med Sci Sports Exerc. 2011 May 4. [Epub ahead of print]

PURPOSE:
To determine the effect of foot orthoses on neuromuscular control and the aerobic cost of running.

METHODS:
Twelve recreational athletes ran for 1 hour on a treadmill at a constant velocity (i.e. 10% higher than their first ventilatory threshold) with and without custom-molded foot orthoses, in a counterbalanced order. Surface electromyographic (EMG) activity of 5 lower limb muscles, together with oxygen consumption and heart rate were recorded at 8 min intervals, starting after 2 min, during the run. A series of neuromuscular tests including voluntary and electrically evoked contractions of the ankle plantar-flexors were performed before and after running.

RESULTS:
Peroneus longus root mean square (RMS) amplitude decreased with time, independently of the condition (-18.9%; P<0.01). Lower RMS signal amplitude for vastus medialis (-13.3% P<0.02,) and gastrocnemius medialis (-10.7%, P<0.05), combined with increased peroneus longus burst duration (+14.7%; P<0.05) occurred when running with orthoses. There was no main effect of the condition for oxygen consumption (P>0.05), while heart rate was significantly lowered while wearing foot orthoses (-3%; P<0.02). Maximal strength capacity (-9%; P < 0.01), normalized EMG activity (-17%; P < 0.001) and peak twitch torque (-14%; P < 0.01) declined from pre- to post-exercise, independently of the condition. Smaller fatigue-induced decrements in the rate of torque development within the first 200 ms (-6% vs. -33%; P<0.01) were reported after running with foot orthoses.

CONCLUSIONS:
Wearing foot orthoses alters neuromuscular control during the course of a sub-maximal, 1-h treadmill run and partly protects from the resulting fatigue-induced reductions in rapid force development characteristics of the plantar flexors. However, these changes may be too small to alter the aerobic cost of running.
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Admin2 · May 10, 2011

Related thread:
Foot orthoses and running performance

CraigT · May 12, 2011

Perhaps admin can change the name of this thread-

Well done to my Aspetar Podiatry colleague (and Pod Arena contributor) Luke Kelly and Physiologists Olivier and Sebastien.
The aerobic cost was not different, but

Wearing foot orthoses alters neuromuscular control during the course of a sub-maximal, 1-h treadmill run and partly protects from the resulting fatigue-induced reductions in rapid force development characteristics of the plantar flexors
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Which suggests that alterations in neuromuscular patterns may be one mechanism by which foot orthoses have an effect.

Foot orthoses and aerobic cost

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Foot orthoses and aerobic cost

NewsBot The Admin that posts the news.

Admin2 Administrator Staff Member

CraigT Well-Known Member

Foot Orthoses and Greater Trochanteric Pain Syndrome

Ankle-foot orthoses

Foot orthoses for first metatarsophalangeal joint osteoarthritis

Deformable Foot Orthoses Redistribute Power from the Ankle to the Distal Foot

The Impact of Foot Orthoses and Exercises on Pain and Navicular Drop for Adult Flatfoot

Effect by custom-made foot orthoses with added support under the first metatarsophalangeal joint

Plantar forefoot pain: ultrasound findings before and after treatment with custom-made foot orthoses

Share This Page

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