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How fiber dynamics of plantarflexor and dorsiflexor muscles based on EMG-driven approach can explain the metabolic cost at different gait speeds
Purpose The aim of this study was to investigate the fiber dynamics of plantarflexor and dorsiflexor muscles and their association with the net metabolic rate (NC w ). Methods Metabolic, kinematic, kinetic, and electromyography measurements were made on seven young subjects while they walked on a fo...
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Published in: | European journal of applied physiology 2022-03, Vol.122 (3), p.745-755 |
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Main Authors: | , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites |
Online Access: | Get full text |
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Summary: | Purpose
The aim of this study was to investigate the fiber dynamics of plantarflexor and dorsiflexor muscles and their association with the net metabolic rate (NC
w
).
Methods
Metabolic, kinematic, kinetic, and electromyography measurements were made on seven young subjects while they walked on a force-plate instrumented treadmill at 1.00, 1.20, 1.40, 1.60, and 1.8 m/s for 1:30 min. The net metabolic rate was computed, and a one degree-of freedom EMG-driven approach was used to extract the force generation ability (
F
ability
), and active force–length (
f
AL
) and force–velocity (
f
V
) multiplier of each muscle. A one-way (speeds) repeated measures ANOVA was performed for each muscle and a multiple linear regression model was used to explain NC
w
.
Results
F
ability
was significantly affected by gait speed for the
GasMed
and the
SOL
muscles. The decrease of
F
ability
for the
SOL
and the
GasMed
was accompanied by a decrease in the force–velocity multiplier. The peak muscle force for the
SOL
increased for the lowest speed compared to the higher speed, and for the
TibAnt
increased at high speed compared to low speed. In addition,
F
ability
f
AL
, and
f
V
of the
SOL
predicted over 58% of NC
w
and
F
Max
of the
TibAnt
accounts for 39.9% of the variance in NC
w
.
Conclusion
The increase of NC
w
with gait speed over the preferred walking speed can be partially explained by the decreasing capacity of the
SOL
muscle to produce muscle force and more specifically by the force–velocity relationship and an increase in muscle force for the
TibAnt
. |
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ISSN: | 1439-6319 1439-6327 |
DOI: | 10.1007/s00421-021-04881-4 |