Distribution of different fibre types in human skeletal muscles 2. A study of cross‐sections of whole m. vastus lateralis

Lexell, Jan; Henriksson-Larsén, Karin; Sjöstróm, Michael

doi:10.1111/j.1748-1716.1983.tb07185.x

Cited by 280 publications

(155 citation statements)

References 25 publications

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“…In addition, if motor axons are in a refractory state at the instant of stimulus application, this can suppress superimposed torque, particularly at higher values of MVT. 32 Furthermore, there is a nonrandom distribution of fiber types in the quadriceps, with relatively more type II fibers 33 and more larger motor units 34,35 in superficial layers. Percutaneous stimulation, with lower stimulation currents will not reach deep into the muscle tissue, 18 and, therefore, potentially more type II fibers may be activated with submaximal muscle compared with maximal nerve stimulation.…”

Section: Discussion Superimposed Torquementioning

confidence: 99%

Effect of stimulation intensity on assessment of voluntary activation

2012

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Introduction: The interpolated twitch technique is often used to assess voluntary activation (VA) of skeletal muscles. We investigated VA and the voluntary torque-superimposed torque relationship using either supramaximal nerve stimulation or better tolerated submaximal muscle stimulation, which is often used with patients. Methods: Thirteen healthy subjects performed maximal and submaximal isometric knee extensions with superimposed maximal or submaximal doublets (100 Hz). Results: Superimposed torque relative to potentiated resting doublets was smaller with maximal nerve than with submaximal muscle stimulation. Maximal VA was 87 6 7% and 93 6 5% for submaximal muscle and maximal nerve stimulation, respectively. The individual voluntary torque-superimposed torque relationships were more linear for submaximal muscle stimulation, possibly leading to less overestimation of VA. Conclusions: Submaximal muscle stimulation can be used to estimate VA in the knee extensors. It is less painful, and overestimation of VA may be less compared with maximal nerve stimulation.

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Section: Discussion Superimposed Torquementioning

confidence: 99%

Effect of stimulation intensity on assessment of voluntary activation

2012

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“…This strongly suggests that the child/adult differences in Figure 1 are likely to be a very real phenomenon that extends to a range of skeletal muscles in humans. Lexell and his co-workers 33 have reported that the distribution of different ®bre types varies within a muscle, mainly as a function of depth, with a predominance of Type 2 ®bres at the surface and Type 1 ®bres in deeper regions of the muscle. Thus, the ®bre type distribution is not random and while every endeavour was taken during the collection of muscle biopsy samples to ensure consistency, this must be taken into consideration when data on ®bre type composition are compared with functional variables.…”

Section: Discussionmentioning

confidence: 99%

Muscle fibre type composition in infant and adult populations and relationships with obesity

et al. 1997

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OBJECTIVES: To investigate the ®bre type composition of skeletal muscle in infants and young children and to compare the ®ndings to an adult population. To relate the ®bre type pro®le of skeletal muscle in adults to measures of adiposity. DESIGN: Cross-sectional studies of skeletal muscle ®bre composition in infants and adults with measures of adiposity in the adults. SUBJECTS: 21 healthy infants and young children (age: 3±21 months) and 40 healthy adult Australian Caucasians (age: 26±62 y; BMI: 18±48 kg/m 2 ). MEASUREMENTS: Skeletal muscle ®bre type composition (by myosin ATPase method) and relative body fatness (BMI, waist circumference and waist/hip ratio (WHR)). RESULTS: Infants and young children had signi®cantly lesser proportions of glycolytic Type 2b ®bres (6.2 AE 1.1%; range 0.3±18.9%) compared with adults (20.5 AE 1.6%; range 4.9±36.0%) (p`0.0001). The percentage of Type 2b ®bres was directly related to BMI (r 0.44, p 0.02), waist circumference (r 0.49, p 0.009) and WHR (r 0.44, p 0.02) in adults. A signi®cant, direct relationship was also found between the proportion of glycolytic Type 2b ®bres and age in the adults (r 0.45, p 0.01). CONCLUSION: Skeletal muscle ®bre type composition is different in infants and adults and there is an age-dependent increase in Type 2b ®bres over the lifespan. An increased proportion of glycolytic Type 2b ®bres is associated with obesity in adults. Results support a gene-environment interaction on ®bre type composition in human skeletal muscle.

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“…Furthermore, in the vastus lateralis a slight predominance of slow twitch fibres has been shown in the deeper regions of the muscle tissue (Lexell et al 1983). Therefore a greater penetrative depth of near-infrared light would likely favour faster microvascular oxygen pressure (McDonough et al 2004) and thus [HHb] kinetics (Ferreira et al 2005) during recovery and may explain some of the differences between groups.…”

Section: [Hhb] Kineticsmentioning

confidence: 99%

Pulmonary oxygen uptake and muscle deoxygenation kinetics during recovery in trained and untrained male adolescents

et al. 2011

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Previous studies have demonstrated faster pulmonary oxygen uptake ( 2 o V  ) kinetics in the trained state during the transition to and from moderate-intensity exercise in adults. Whilst a similar effect of training status has previously been observed during the on-transition in adolescents, whether this is also observed during recovery from exercise is presently unknown. The aim of the present study was therefore to examine 2 o V  kinetics in trained and untrained male adolescents during recovery from moderate-intensity exercise.15 trained (15 ± 0.8 yrs, ) male adolescents performed two 6-minute exercise off-transitions to 10W from a preceding "baseline" of exercise at a workload equivalent to 80% lactate threshold; s, P<0.01) and mean response time (Trained: 24.2 ± 9.2 s vs Untrained: 34 ± 13 s, P=0.05) of muscle deoxyhaemoglobin off-kinetics was faster in the trained subjects compared to the untrained subjects.kinetics was unaffected by training status; the faster muscle deoxyhaemoglobin kinetics in the trained subjects thus indicates slower blood flow kinetics during recovery from exercise compared to the untrained subjects.

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Distribution of different fibre types in human skeletal muscles 2. A study of cross‐sections of whole m. vastus lateralis

Cited by 280 publications

References 25 publications

Effect of stimulation intensity on assessment of voluntary activation

Effect of stimulation intensity on assessment of voluntary activation

Muscle fibre type composition in infant and adult populations and relationships with obesity

Pulmonary oxygen uptake and muscle deoxygenation kinetics during recovery in trained and untrained male adolescents

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