Chapter 7 Roles of muscle activity and load on the relationship between muscle spindle length and whole muscle length in the freely walking cat

Hoffer, J. A.; Caputi, Ángel A.; Pose, I.; Griffiths, R.I.

doi:10.1016/s0079-6123(08)62201-3

Cited by 137 publications

(89 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Moreover, whenever the parent muscle was deactivated, elastic recoil of its tendon might elongate the muscle fascicle whether the whole muscle was shortening or lengthening (Hoffer et al, 1989;Roberts et al, 1997). Moreover, the muscle itself is part of the "load" and its mechanical properties were certainly changing during the task.…”

Section: Discussionmentioning

confidence: 99%

“…It is well known that changes in overall muscle-tendon length may differ significantly from those of the muscle fascicles due to series elasticity represented by tendons (Hoffer et al, 1989;Loram et al, 2005). Moreover, the relative contribution of muscle fascicle length and tendon length to imposed whole-muscle length changes depends on the contraction level and this effect is evident already at low contraction levels (Herbert et al, 2002).…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Discharges in Human Muscle Receptor Afferents during Block Grasping

Dimitriou¹,

Edin²

2008

J. Neurosci.

View full text Add to dashboard Cite

Human grasping relies on feedforward control that is monitored and corrected on-line by means of sensory feedback. While much of the sensory mechanisms underpinning hand-object interaction are known, information has been lacking about muscle receptor responses during the phases before and after actual object contact. We therefore let subjects use their thumb and fingers to grasp blocks presented to them while we recorded muscle afferents from the thumb and finger extensor muscles along with wrist and digit kinematics, and electromyographic activity. The kinematics of the task was indistinguishable from "normal" grasping. None of the afferents encoded either object contact or finger apposition. Both primary and secondary afferents were more phase advanced on the parent muscle lengths than expected from previous studies as well as from their responses to imposed length changes of their parent muscles. Thus, the discharges of both primary and secondary afferents were well correlated to the tendon velocity of their parent muscles and that of primary afferents also to acceleration whereas neither appeared to encode muscle length as such. Decoding the velocity of muscle length changes were significantly improved if the discharge of Golgi tendon organ afferents were taken into account along with that of the muscle spindle afferents. We propose that these findings may be explained by the biomechanical properties of contracting muscles. Moreover, we conclude that it seems unlikely that the muscle spindle afferents recorded in this task have any role in providing "proprioceptive" information pertaining to the size of an object grasped.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Discharges in Human Muscle Receptor Afferents during Block Grasping

Dimitriou¹,

Edin²

2008

J. Neurosci.

View full text Add to dashboard Cite

show abstract

Section: Dynamics Of Muscle and Tendon During Stretch-shortening Cyclmentioning

confidence: 99%

“…Hoffer, et al, 1989). For example, Hoffer, et al, (1989) reported that lengthening and shortening happened simultaneously during locomotion in cat Achilles tendon and medial gastrocnemius muscle, respectively. These findings suggest that the interaction between length changes of muscle fibers and tendon structures should be considered when discussing the dynamics of muscle and tendon during human movements.…”

Section: Dynamics Of Muscle and Tendon During Stretch-shortening Cyclmentioning

confidence: 99%

In Vivo Elastic Properties of Human Tendon Structures in Lower Limb

Kubo

2005

Int. J. Sport Health Sci.

View full text Add to dashboard Cite

The present study was conducted to evaluate the elastic properties of human tendon structures and their influences on human movements, and to investigate the effects of resistance training on tendon properties. During isometric contraction, the elongations of tendon structures in knee extensors and plantar flexors were measured by means of real-time ultrasonography. The resulting tendon force and elongation relationship was non-linear in form, as previously reported on animal and human cadaver tendons in vitro. The estimated Young's modulus, i.e., the slope of the stress -strain curve, tended to be lower than the previously reported values. In human movements, the elastic properties of tendon structures had a favorable effects on stretch-shortening cycle exercises, possibly because of improved storage and release of elastic energy. Furthermore, the adaptation of the tendon structures to physical training varies with the combinations of intensity, contraction time during exercise as previously observed in the animal experiments. Furthermore, the elastic properties of human tendon structures could be new indices of physical resources in vivo.

show abstract

“…Due to parameter variability and covariance, it is advantageous to measure parameters in conjunction with one another, rather than to use parameters from different data-sets (Hoffer et al, 1989;Hoy et al, 1990;Loren et al, 1996). In addition, stochastic musculoskeletal models (Hughes and An, 1997;McLean et al, 2003;Valero-Cuevas et al, 2003;Davidson et al, 2004) require parameter distributions.…”

Section: Introductionmentioning

confidence: 99%

Variability in isometric force and moment generating capacity of glenohumeral external rotator muscles

Langenderfer

Patthanacharoenphon

Carpenter

et al. 2006

Clinical Biomechanics

View full text Add to dashboard Cite

Background. Muscles which cause glenohumeral external rotation possess varying ability for generating force and moment due to differences in muscle architecture, moment arm, and the interaction of these two factors. This study's purpose was to determine a complete dataset of muscletendon parameters for predicting the moment generating capacity and force-length dependence for external rotation of infraspinatus, supraspinatus and teres minor muscles.Methods. Muscle fascicle length, sarcomere length, pennation angle, and muscle volume were measured for sub-regions of infraspinatus and supraspinatus, and teres minor from 10 glenohumeral specimens. Tendon excursion was measured for glenohumeral rotation. From these parameter measurements, optimal fascicle length, physiological cross-sectional area, muscle force-length dependence, and maximum isometric moment generating capacity were calculated.Findings. Substantial differences were found for optimal muscle length, physiologic cross-sectional area, and tendon length for the 10 specimens of this study. Muscle sub-region had a significant effect on the force-length relationship for infraspinatus (P < 0.001), but was not significant for supraspinatus (P = 0.49). For infraspinatus and supraspinatus, maximum isometric rotation moment capacity was greater at 10° versus 60° abduction (P < 0.001). Maximum isometric rotation moment capacity for the teres minor was greater at 10° versus 60° abduction (P < 0.01). Sub-regions demonstrated significant differences in isometric moment capacity (P < 0.001).Interpretation. Functional capabilities of these muscles depend on muscle architecture and moment arm as well as their combined effects. The results allow for development of stochastic and deterministic models of glenohumeral external rotation strength which can be used for prediction of muscle forces and joint moments.

show abstract

Chapter 7 Roles of muscle activity and load on the relationship between muscle spindle length and whole muscle length in the freely walking cat

Cited by 137 publications

References 25 publications

Discharges in Human Muscle Receptor Afferents during Block Grasping

Discharges in Human Muscle Receptor Afferents during Block Grasping

In Vivo Elastic Properties of Human Tendon Structures in Lower Limb

Variability in isometric force and moment generating capacity of glenohumeral external rotator muscles

Contact Info

Product

Resources

About