The supine hip extensor manual muscle test: a reliability and validity study.
Conclusion: Exercise intensity and multiple sets result in alterations in muscle recruitment patterns of the lumbar and hip extensor muscles.
The exoskeleton reduced musculoskeletal loading on the lower back and assisted with hip extensor torque during lifting and lowering.
During rostral scratching, hip extensor deletions can occur [9, 39].
Hip extensor, knee extensor, and ankle dorsiflexor moments were generated for the sumo group, whereas hip extensor, knee extensor, knee flexor, and ankle plantar flexor moments were generated for the conventional group.
This lack of quiescence presumably results from the absence of inhibition from hip extensor related motor pools.
Human pelves reduce hip extensor moments but permit a greater degree of hip extension, which greatly improves walking economy (i.e., distance traveled/energy consumed).
However, there is a delay in the onset of knee extensor activity relative to hip extensor in caudal scratch that was not modeled in the earlier study.
The only way to shut down hip extensor behavior in both the standard and the strong cross-excitation architectures, by only changing inputs and without changing synaptic weights from interneuron motor pools to the hip extensor (which would be a trivial but non-biological solution), is by decreasing input to IR and EP until oscillations are lost (Fig. 2).
There are many experimental examples of pocket rhythms in which knee extensor becomes active just before hip extensor, at the final moments of hip flexor activity, and indeed a mean pocket rhythm computed from experimentation has this property [30].
These patterns feature alternating phases of motoneuron activation that occur repeatedly, with different patterns distinguished by the relative timing and duration of activity of hip extensor, hip flexor, and knee extensor motoneurons.
