Vastus lateralis fatigue alters recruitment of musculus quadriceps femoris in humans

Akima, Hiroshi; Foley, Jeanne M.; Prior, Barry M.; Dudley, Gary A.; Meyer, Ronald A.

doi:10.1152/japplphysiol.00267.2001

Cited by 89 publications

(96 citation statements)

References 41 publications

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“…Two 8 ϫ 10-cm surface electrodes (Uni-Patch, Wabasha, MN) were placed on the proximal and distal portions of the VL. This electrode placement has previously been shown to allow sufficient recruitment of the VL in AB subjects and is essentially as done previously (5,30). A commercial stimulator (TheraTouch model 4.7, Rich-Mar, Inola, OK) was used for EMS.…”

Section: Subjectsmentioning

confidence: 99%

Acute molecular responses of skeletal muscle to resistance exercise in able-bodied and spinal cord-injured subjects

Bickel

Slade

Haddad

et al. 2003

Journal of Applied Physiology

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. Acute molecular responses of skeletal muscle to resistance exercise in ablebodied and spinal cord-injured subjects. J Appl Physiol 94: 2255-2262. First published February 28, 2003 10.1152/japplphysiol.00014.2003.-Spinal cord injury (SCI) results in muscle atrophy, which contributes to a number of health problems, such as cardiovascular deconditioning, metabolic derangement, and osteoporosis. Electromyostimulation (EMS) holds the promise of ameliorating SCI-related muscle atrophy and, therefore, improving general health. To date, EMS training of long-term SCI subjects has resulted in some muscle hypertrophy but has fallen short of normalizing muscle mass. The aim of this study was to compare the molecular responses of vastus lateralis muscles from able-bodied (AB) and SCI subjects after acute bouts of EMS-induced resistance exercise to determine whether SCI muscles displayed some impairment in response. Analysis included mRNA markers known to be responsive to increased loading in rodent muscles. Muscles of AB and SCI subjects were subjected to EMS-stimulated exercise in two 30-min bouts, separated by a 48-h rest. Needle biopsy samples were obtained 24 h after the second exercise bout. In both the AB and SCI muscles, significant changes were seen in insulin-like growth factor binding proteins 4 and 5, cyclin-dependent kinase inhibitor p21, and myogenin mRNA levels. In AB subjects, the mRNA for mechano-growth factor was also increased. Before exercise, the total RNA concentration of the SCI muscles was less than that of the AB subjects but not different postexercise. The results of this study indicate that acute bouts of resistance exercise stimulate molecular responses in the skeletal muscles of both AB and SCI subjects. The responses seen in the SCI muscles indicate that the systems that regulate these molecular responses are intact, even after extended periods of muscle unloading. mechano-growth factor; insulin-like growth factor I; insulinlike growth factor binding protein; myogenin INACTIVITY CAN LEAD TO A LOSS of muscle mass and function. Complete spinal cord injury (SCI) leads to inactivation and profound muscle unloading. The muscles of SCI patients are characterized by severe atrophy, as well as extensively altered metabolic and contractile protein profiles (6,19,40). For example, within several months of SCI, muscles and their constituent myofibers can be reduced to ϳ41% of the size of those of able-bodied (AB) individuals (16, 15). The loss in muscle mass and function can contribute to a number of health problems, such as decreased cardiorespiratory fitness, impaired glucose tolerance, and osteoporosis (37, 39).Recognition of potential benefits to be garnered by maintaining or increasing muscle mass in SCI patients has lead to a number of studies aimed at using electromyostimulation (EMS) to induce contractile activity in the muscles of these patients. In AB subjects, EMSinduced resistance exercise has been shown to result in increases in muscle size and performance (13,14,41). Studies have also shown...

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Section: Subjectsmentioning

confidence: 99%

Acute molecular responses of skeletal muscle to resistance exercise in able-bodied and spinal cord-injured subjects

Bickel

Slade

Haddad

et al. 2003

Journal of Applied Physiology

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“…More complex models have been developed to incorporate the dynamic behavior of muscles during locomotion and the influence of muscle properties on the capacity of each synergist to develop force (Pedotti et al, 1978), or to include the effect of muscle fiber type and fatique susceptibility of different muscle heads on force distribution (Dul et al, 1984). Empirical measurements of force production in muscle synergists (Akima et al, 2002;Biewener and Baudinette, 1995;Biewener and Corning, 2001;Fagg et al, 2002;Herzog and Leonard, 1991;Kaya et al, 2003;Stokes and Gardner-Morse, 2001) do not consistently support any of these models. This lack of consistent agreement between empirical measurements and theoretical predictions has led several researchers to suggest there may not be one model of force sharing for all musculoskeletal tasks.…”

Section: Introductionmentioning

confidence: 99%

Task-dependent force sharing between muscle synergists during locomotion in turkeys

Nelson

Roberts

2008

Journal of Experimental Biology

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SUMMARYAt most joints, there is a redundancy of muscle function. For any given movement, there are a wide range of possible solutions to the problem of how force is shared among muscle synergists. A better understanding of how force is shared among muscle synergists can provide insight into the mechanics and control of movement. We examined force sharing in the gastrocnemius of wild turkeys (Meleagris gallopavo), using strain gauges bonded to bony tendons. Force was measured separately in the lateral (LG) and medial (MG) heads of the gastrocnemius, to evaluate force sharing. We also used inverse dynamics to determine the total force required during swing phase. To determine whether the pattern of force sharing varied depending on the mechanical task, we used running speed (1 to 3.5·m·s -1 ) and limb loading (30 and 60·g added tarsometatarsal mass) to vary the force required at the intertarsal joint. We found that the distribution of force between these two heads varied depending on the phase of the stride cycle. During stance, force was shared in near equal amounts between the two heads and this distribution was unaffected by changes in running speed or limb load. During swing phase, however, there was no force sharing. Force was produced only in the lateral head, and this force was not significantly different from the total force required, as calculated from inverse dynamics. Thus, the LG produced all of the force required for limb extension during swing. This change in the pattern of force sharing between stance and swing supports the theory that force sharing between muscle synergists is task-dependent.

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“…the bi-articular rectus femoris and the mono-articular vastus medialis, vastus lateralis and vastus intermedius muscles, task redundancy in the system may allow performance of a submaximal task with different contributions from the individual muscles. Such task redundancy has been shown for knee extension exercise that was preceded by electrostimulated-fatigue of vastus lateralis (19).…”

Section: Introductionmentioning

confidence: 70%

“…Such compensation by synergistic muscles is not uncommon. For example, compensation by vastus medialis and rectus femoris during fatiguing submaximal knee extension has been shown when the exercise was preceded by electrostimulated-fatigue of vastus lateralis only (19). Thus, acute modifications of neuromuscular coordination among synergistic muscles allow to perform the exercise during muscle-specific fatigue (19).…”

Section: Discussionmentioning

confidence: 99%

“…For example, compensation by vastus medialis and rectus femoris during fatiguing submaximal knee extension has been shown when the exercise was preceded by electrostimulated-fatigue of vastus lateralis only (19). Thus, acute modifications of neuromuscular coordination among synergistic muscles allow to perform the exercise during muscle-specific fatigue (19). Our monitoring of only vastus lateralis and vastus medialis does not allow to pinpoint which of the knee extensor muscles may have been more injury susceptible, if this was the case at all.…”

Section: Discussionmentioning

confidence: 99%

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Gender Differences after Downhill Running for Voluntary Isometric Contractions of Knee Extensor Muscles using Surface EMG

Willems¹,

Northcott²

2009

Medicina Sportiva

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Introduction: We examined gender differences for performance and surface electromyograms (sEMG) of knee extensors 1hr after downhill running.Methods After downhill running, MVIF deficits were similar (males: 11.7±7.2%, females: 7.5±7.7%) with no changes in endurance times during 50%MVIF. After the downhill run, there was a trend in females, but not males, of an increased ratio for the root mean square (RMS) values of the VL and VM muscles during MVIF testing by 23% (P=0.054). After the downhill run, females, but not males, lowered during 50%MVIF the change in RMS for VM from 48±32% to 30±31% and for VL from 36±23% to 21±18% (P<0.05). For males, a trend was observed for the change in median frequency in VL during 50%MVIF (P=0.05). After downhill running, females, altered the vastus medialis and vastus lateralis contributions to maximal isometric force production and the activity pattern of these muscles during submaximal isometric fatigue.Conclusion: Acute neuromuscular adaptations after downhill running occur during voluntary isometric contractions of knee extensor muscles in females, but not in males.

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Vastus lateralis fatigue alters recruitment of musculus quadriceps femoris in humans

Cited by 89 publications

References 41 publications

Acute molecular responses of skeletal muscle to resistance exercise in able-bodied and spinal cord-injured subjects

Acute molecular responses of skeletal muscle to resistance exercise in able-bodied and spinal cord-injured subjects

Task-dependent force sharing between muscle synergists during locomotion in turkeys

Gender Differences after Downhill Running for Voluntary Isometric Contractions of Knee Extensor Muscles using Surface EMG

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