Neuromuscular function of the plantar flexors and predictors of peak power in middle-aged and older males

Olmos, Alex A.; Stratton, Matthew T.; Ha, Phuong Hoai; VanDusseldorp, Trisha A.; Bailly, Alyssa R.; Feito, Yuri; Mangine, Gerald T.; Poisal, Micah J.; Jones, Joshua; Dalton, Benjamin E.; Smith, Tyler M; Hester, Garrett M.

doi:10.1016/j.exger.2019.110677

Cited by 10 publications

(20 citation statements)

References 69 publications

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“…It is critically important to gain more evidence on the PFs due to the significance of this muscle group for optimal gait in older adults [21], and due to the more mixed fiber type composition of the PFs, age-related changes in neuromuscular function may differ from that of the knee extensors. In addition, RTD during an isotonic contraction of the PFs was recently shown to be a stronger predictor of power output compared to other factors such as velocity, muscle strength or cross-sectional area (CSA) in middle-aged and older males [22]. Considering the importance of muscle power preservation in older adults [23], this lends further support for the need to investigate the effects of aging on rapid torque production, and the factors influencing its decline.…”

Section: Introductionmentioning

confidence: 93%

“…Physical activity (steps per day) was objectively measured via an Actigraph GTX3+ accelerometer (Actigraph, Pensacola, FL, USA). Only data for participants with wear time of at least 10 hrs per day, for a minimum of 3 days was used for analysis, as previously described [22].…”

Section: Physical Activitymentioning

confidence: 99%

“…Panoramic images of the MG and lateral gastrocnemius were obtained using a B-mode ultrasound (LOGIQ S7, General Electric Company, Milwaukee, WI) using previously reported procedures [22]. Briefly, images were acquired with a multifrequency linear-array probe (ML6-15 L; 5-13 MHz; 50mm field of view; General Electric Company, Milwaukee, WI) using the LogicVIEW function.…”

Section: Ultrasonographymentioning

confidence: 99%

“…For statistical analysis, CSA was calculated as the sum of the gastrocnemii muscles, while EI was calculated as the average of the gastrocnemii. The CSA and EI data as well as reliability statistics have been reported elsewhere [22].…”

Section: Ultrasonographymentioning

confidence: 99%

“…The signal was then smoothed using a zero-lag, low-pass filter (10 Hz) and normalized to its peak amplitude (PEMG). Rate of EMG rise (RER) (i.e., rate of muscle activation) was calculated as the linear slope of the normalized EMG signal at 30 (RER 0-30 ), 50 (RER 0-50 ), and 75 (RER 0-75 ) ms from onset [6,22]. The EMG onset was determined as the moment when baseline amplitude reached 2.5% of PEMG.…”

Section: Signal Processingmentioning

confidence: 99%

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Early and late rapid torque characteristics and select physiological correlates in middle-aged and older males

Olmos

Stratton

et al. 2020

PLoS ONE

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The purpose of this study was to compare early and late rapid torque parameters of the plantar flexors (PFs) in middle-aged (MM) and older (OM) males, and determine the effect of normalization to peak torque (PT) and muscle cross-sectional area (CSA). Methods Twenty-nine healthy, MM (n = 14; 45 ± 2 yrs) and OM (n = 15; 65 ± 3 yrs) performed rapid, maximal isometric contractions of the PFs. PT, as well as rate of torque development and impulse during the early (0-50 ms; RTD 0-50 , IMP 0-50) and late (100-200 ms; RTD 100-200 , IMP 100-200) contraction phases were calculated. Torque at 50 (TQ 50), 100 (TQ 100), and 200 (TQ 200) ms was also obtained. CSA and echo-intensity (EI) of the gastrocnemii were acquired via ultrasonography. Torque variables were normalized to PT and CSA. Rate of EMG rise (RER) for the medial gastrocnemius was calculated at 30, 50 and 75 ms.

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Section: Introductionmentioning

confidence: 93%

Section: Physical Activitymentioning

confidence: 99%

Section: Ultrasonographymentioning

confidence: 99%

Section: Ultrasonographymentioning

confidence: 99%

Section: Signal Processingmentioning

confidence: 99%

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Early and late rapid torque characteristics and select physiological correlates in middle-aged and older males

Olmos

Stratton

et al. 2020

PLoS ONE

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Muscle quality indices separately associate with joint-level power-related measures of the knee extensors in older males

et al. 2022

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Purpose The purpose of this study was to investigate associations of muscle quality indices with joint-level power-related measures in the knee extensors of thirty-two older males (65–88 years). Methods Muscle quality indices included: echo intensity, ratio of intracellular- to total water content (ICW/TW), and specific muscle strength. Echo intensity was acquired from the rectus femoris (EIRF) and vastus lateralis (EIVL) by ultrasonography. ICW/TW was computed from electrical resistance of the right thigh obtained by bioelectrical impedance spectroscopy. Specific muscle strength was determined as the normalized maximal voluntary isometric knee extension (MVIC) torque to estimated knee extensor volume. Isotonic maximal effort knee extensions with a load set to 20% MVIC torque were performed to obtain the knee extension power-related measures (peak power, rate of power development [RPD], and rate of velocity development [RVD]). Power and RPD were normalized to MVIC. Results There were no significant correlations between muscle quality indices except between EIRF and EIVL (|r|≤ 0.253, P ≥ 0.162). EIRF was negatively correlated with normalized RPD and RVD (r ≤ − 0.361, P ≤ 0.050). ICW/TW was positively correlated with normalized peak power (r = 0.421, P = 0.020). Specific muscle strength was positively correlated with absolute peak power and RPD (r ≥ 0.452, P ≤ 0.012). Conclusion Knee extension power-related measures were lower in participants with higher EI, lower ICW/TW, and lower specific muscle strength, but the muscle quality indices may be determined by independent physiological characteristics.

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Sit-to-Stand Kinetics and Correlates of Performance in Young and Older Males

Smith

Hester

et al. 2020

Archives of Gerontology and Geriatrics

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Neuromuscular function of the plantar flexors and predictors of peak power in middle-aged and older males

Cited by 10 publications

References 69 publications

Early and late rapid torque characteristics and select physiological correlates in middle-aged and older males

Early and late rapid torque characteristics and select physiological correlates in middle-aged and older males

Muscle quality indices separately associate with joint-level power-related measures of the knee extensors in older males

Sit-to-Stand Kinetics and Correlates of Performance in Young and Older Males

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