Examination of muscle morphology and neuromuscular function in normal weight and overfat children aged 7‐10 years

Herda, Trent J.; Ryan, Eric D.; Kohlmeier, Martin; Trevino, Michael A.; Gerstner, Gena R.; Roelofs, Erica J.

doi:10.1111/sms.13256

Cited by 28 publications

(27 citation statements)

References 52 publications

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“…None of the subjects reported any neuromuscular or metabolic diseases or current or recent musculoskeletal injuries specific to the ankle, knee or hip joints. These data were part of a larger project that was previously published (Herda et al., ).…”

Section: Methodsmentioning

confidence: 99%

“…Second, for each subject linear regressions were constructed for MUAP AMP and ISI vs . RT relationships (Figure ) for the MG and VL (Herda et al., ; Trevino et al., ). For the subsequent analysis on the MU data derived from the relationships, only values from subjects that met the criteria for useable relationships were included for further statistical tests.…”

Section: Methodsmentioning

confidence: 99%

“…Herda et al. (), however, reported a large difference (effect size = 0.76), albeit non‐significant, in the firing rates relative to recruitment threshold of the VL during a higher intensity contraction (60% of maximal voluntary contraction; MVC) between the NW and OF children. The OF children possessed a less negative slope of the firing rate vs .…”

Section: Introductionmentioning

confidence: 97%

“…Recently, Herda et al. () reported that OF children age 7–10 years possessed similar mCSAs of the vastus lateralis to NW children only when accounting for mEI. In contrast, Miller, Sterczala, Trevino, and Herda () examined the mCSA of a small muscle of the hand (first dorsal interosseous; FDI) in younger children to control for the chronic mechanical overload of larger body mass.…”

Section: Introductionmentioning

confidence: 99%

“…There is limited research that has examined potential differences in the properties of motor units between NW and OF children (Herda et al., ; Miller et al., ). Miller et al.…”

Section: Introductionmentioning

confidence: 99%

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Muscle cross‐sectional area and motor unit properties of the medial gastrocnemius and vastus lateralis in normal weight and overfat children

Herda

Ryan

Kohlmeier

et al. 2020

Experimental Physiology

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This study examined the possible differences in muscle cross-sectional area (mCSA), motor unit action potential amplitudes (MUAP AMPS ) and interspike intervals (ISIs) of the firing instances of the medial gastrocnemius (MG) and vastus lateralis (VL) between normal weight (NW) and overfat (OF) children aged 7-10 years. Fourteen NW (age = 8.6 ± 1.1 years, BMI = 15.8 ± 1.4 kg m −2 ) and 12 OF (age = 8.8 ± 0.9 years, BMI = 21.8 ± 2.4 kg m −2 ) children performed isometric trapezoidal muscle actions at 40% of maximal voluntary contraction of the plantar flexors and knee extensors.Surface electromyography was recorded from the MG and VL and decomposed into the firing events of motor units (MUs). Statistical procedures were performed on the composite recruitment thresholds (RTs), ISIs and MUAP AMPS of recorded MUs collapsed across subjects and the y-intercepts and slopes calculated from each subject's ISI and MUAP AMP vs. RT relationships.Ultrasound was used to assess mCSA, echo intensity (mEI), and subcutaneous fat (sFAT) of the MG and VL. The OF had greater mCSAs, mEI and sFAT (P = 0.004-0.024), but there were no differences in mCSA when accounting for mEI for the MG (P = 0.506) and VL (P = 0.326). The NW children had significantly greater composite MUAP AMPS for the VL and MG (P < 0.001), but only significantly larger MUAP AMPS of the VL remained for the NW (P < 0.001) when subjects were matched for sFAT. There were no differences between groups for the ISI or MUAP AMP vs. RT relationships (P > 0.05). These findings suggest that the OF children did not undergo significant muscle or MU hypertrophy that would be routinely activated during activities of daily living.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

“…There is limited research that has examined potential differences in the properties of motor units between NW and OF children (Herda et al., ; Miller et al., ). Miller et al.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Muscle cross‐sectional area and motor unit properties of the medial gastrocnemius and vastus lateralis in normal weight and overfat children

Herda

Ryan

Kohlmeier

et al. 2020

Experimental Physiology

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Characteristics of motor unit recruitment in boys and men at maximal and submaximal force levels

et al. 2019

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HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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Sex-related differences in motor unit firing rates and action potential amplitudes of the first dorsal interosseous during high-, but not low-intensity contractions

et al. 2020

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Despite ample evidence that females are weaker and possess smaller muscle crosssectional areas (CSAs) compared to males, it remains unclear if there are sex-related differences in the properties of motor units (MU). Eleven males (age=22±3 yrs) and twelve females (age=21±1yrs) performed isometric trapezoid muscle actions at 10% and 70% of maximal voluntary contraction (MVC). Surface electromyography signals were recorded and decomposed into MU action potential (AP) waveforms and firing instances. Average MUAP amplitudes (MUAPAMPS), mean firing rates (MFRs), initial firing rates (IFRs) and recruitment thresholds (RT) were calculated for the 10% MVC while MUAPAMPS, IFRs, and MFRs were regressed against RT for the 70% MVC. Ultrasonography was used to measure CSA of the first dorsal interosseous (FDI). Males had greater CSAs (p<0.001; males=2.34±0.28 cm 2 , females=1.82±0.18 cm 2 ) and MVC strength (p<0.001; males=25.9±5.5 N, females=16.44±2.5 N).No differences existed for MUAPAMPS, IFRs, MFRs, or RTs (p>0.05) during the 10% MVC. For the 70% MVC, the y-intercepts from the MUAPAMPS vs. RT relationships were greater (p<0.05) for the males (males=-0.19±0.53mV; females=-0.78±0.75 mV) while the inverse was true for the MFR vs. RT relationships (males=31.55±6.92 pps, females=38.65±6.71 pps) with no differences (p>0.05) in the slopes. Therefore, smaller CSAs and weaker MVCs are likely the result of smaller higher-threshold MUs for the females.

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Examination of muscle morphology and neuromuscular function in normal weight and overfat children aged 7‐10 years

Cited by 28 publications

References 52 publications

Muscle cross‐sectional area and motor unit properties of the medial gastrocnemius and vastus lateralis in normal weight and overfat children

Muscle cross‐sectional area and motor unit properties of the medial gastrocnemius and vastus lateralis in normal weight and overfat children

Characteristics of motor unit recruitment in boys and men at maximal and submaximal force levels

Sex-related differences in motor unit firing rates and action potential amplitudes of the first dorsal interosseous during high-, but not low-intensity contractions

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