Abstract
In standing subjects, ankle dorsiflexion evoked short-latency responses (SLRs) at 41 and 57 ms, on the average, in soleus (Sol) and flexor digitorum brevis (FDB), respectively. Medium-latency responses (MLRs) occurred at 70 and 95 ms. The time between the MLRs was 25 ms and between the SLRs was 16 ms. The difference between these two values represents the extra-time to conduct the FDB volley for MLR from distal to proximal muscle, in excess to that for SLR. The velocity of the afferents mediating the FDB MLR (21.4 m/s on average) was estimated by dividing the distance between the two muscles by the sum of the above extra-time and the conduction time of la fibres along the same distance. The central delay of FDB MLR (6.7 ms on average) was obtained by dividing the distance between FDB and spinal cord by the sum of afferent and efferent MLR conduction times. The central delay of FDB SLR (1.4 ms) was analogously obtained. These findings give an estimation of the conduction velocity of the group II afferent fibres in humans and support the hypothesis that the FDB MLR is relayed through a spinal oligosynaptic pathway.
| Original language | English |
|---|---|
| Pages (from-to) | 29-32 |
| Number of pages | 4 |
| Journal | Neuroscience Letters |
| Volume | 249 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - Jun 12 1998 |
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Keywords
- Human
- Posture
- Spinal circuits
- Spindle secondary afferents
- Stretch reflex
ASJC Scopus subject areas
- Neuroscience(all)
Cite this
Medium-latency response to muscle stretch in human lower limb : Estimation of conduction velocity of group II fibres and central delay. / Nardone, Antonio; Schieppati, Marco.
In: Neuroscience Letters, Vol. 249, No. 1, 12.06.1998, p. 29-32.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Medium-latency response to muscle stretch in human lower limb
T2 - Estimation of conduction velocity of group II fibres and central delay
AU - Nardone, Antonio
AU - Schieppati, Marco
PY - 1998/6/12
Y1 - 1998/6/12
N2 - In standing subjects, ankle dorsiflexion evoked short-latency responses (SLRs) at 41 and 57 ms, on the average, in soleus (Sol) and flexor digitorum brevis (FDB), respectively. Medium-latency responses (MLRs) occurred at 70 and 95 ms. The time between the MLRs was 25 ms and between the SLRs was 16 ms. The difference between these two values represents the extra-time to conduct the FDB volley for MLR from distal to proximal muscle, in excess to that for SLR. The velocity of the afferents mediating the FDB MLR (21.4 m/s on average) was estimated by dividing the distance between the two muscles by the sum of the above extra-time and the conduction time of la fibres along the same distance. The central delay of FDB MLR (6.7 ms on average) was obtained by dividing the distance between FDB and spinal cord by the sum of afferent and efferent MLR conduction times. The central delay of FDB SLR (1.4 ms) was analogously obtained. These findings give an estimation of the conduction velocity of the group II afferent fibres in humans and support the hypothesis that the FDB MLR is relayed through a spinal oligosynaptic pathway.
AB - In standing subjects, ankle dorsiflexion evoked short-latency responses (SLRs) at 41 and 57 ms, on the average, in soleus (Sol) and flexor digitorum brevis (FDB), respectively. Medium-latency responses (MLRs) occurred at 70 and 95 ms. The time between the MLRs was 25 ms and between the SLRs was 16 ms. The difference between these two values represents the extra-time to conduct the FDB volley for MLR from distal to proximal muscle, in excess to that for SLR. The velocity of the afferents mediating the FDB MLR (21.4 m/s on average) was estimated by dividing the distance between the two muscles by the sum of the above extra-time and the conduction time of la fibres along the same distance. The central delay of FDB MLR (6.7 ms on average) was obtained by dividing the distance between FDB and spinal cord by the sum of afferent and efferent MLR conduction times. The central delay of FDB SLR (1.4 ms) was analogously obtained. These findings give an estimation of the conduction velocity of the group II afferent fibres in humans and support the hypothesis that the FDB MLR is relayed through a spinal oligosynaptic pathway.
KW - Human
KW - Posture
KW - Spinal circuits
KW - Spindle secondary afferents
KW - Stretch reflex
UR - http://www.scopus.com/inward/record.url?scp=0032511070&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0032511070&partnerID=8YFLogxK
U2 - 10.1016/S0304-3940(98)00383-8
DO - 10.1016/S0304-3940(98)00383-8
M3 - Article
C2 - 9672381
AN - SCOPUS:0032511070
VL - 249
SP - 29
EP - 32
JO - Neuroscience Letters
JF - Neuroscience Letters
SN - 0304-3940
IS - 1
ER -