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

2019 ◽  
Vol 125 ◽  
pp. 110677 ◽  
Author(s):  
Alex A. Olmos ◽  
Matthew T. Stratton ◽  
Phuong L. Ha ◽  
Trisha A. VanDusseldorp ◽  
Alyssa R. Bailly ◽  
...  
Keyword(s):  
Peak Power ◽  
Neuromuscular Function ◽  
Plantar Flexors ◽  
Middle Aged ◽  
Older Males

scholarly journals EARLY AND LATE RAPID NEUROMUSCULAR PARAMATERS OF THE PLANTAR FLEXORS IN MIDDLE-AGED AND OLDER MALES

2020 ◽  
Vol 52 (7S) ◽  
pp. 338-338
Author(s):  
Benjamin E. Dalton ◽  
Alex A. Olmos ◽  
Matthew T. Stratton ◽  
Phuong L. Ha ◽  
Trisha A. VanDusseldorp ◽  
...  
Keyword(s):  
Plantar Flexors ◽  
Middle Aged ◽  
Older Males

Neural and muscular alterations of the plantar flexors in middle-aged women

2021 ◽  
pp. 111674
Author(s):  
Kevin C. Phillips ◽  
Byungjoo Noh ◽  
Matthew Gage ◽  
Tejin Yoon
Keyword(s):  
Plantar Flexors ◽  
Middle Aged

scholarly journals Neural And Muscular Alterations Of The Plantar Flexors In Middle-aged Women

2018 ◽  
Vol 50 (5S) ◽  
pp. 30
Author(s):  
Michelle Burge ◽  
Kevin Phillips ◽  
Byungjoo Noh ◽  
Matt Gage ◽  
Tejin Yoon
Keyword(s):  
Plantar Flexors ◽  
Middle Aged

Operational sex ratio and paternal age sway mating and reproductive performance in Menochilus sexmaculatus (Coleoptera: Coccinellidae)

2020 ◽  
Vol 152 (3) ◽  
pp. 298-310
Author(s):  
Swati Saxena ◽  
Geetanjali Mishra ◽  
Omkar
Keyword(s):  
Sex Ratio ◽  
Reproductive Performance ◽  
Mating Behaviour ◽  
Age Groups ◽  
Paternal Age ◽  
Operational Sex Ratio ◽  
Middle Aged ◽  
Developmental Duration ◽  
Development Duration ◽  
Older Males

AbstractOperational sex ratio and paternal age are known to independently affect mating behaviour and reproductive performance. We conducted experiments to assess the effects of operational sex ratio and paternal age on mating, reproduction, and total development duration of Menochilus sexmaculatus (Fabricius) (Coleoptera: Coccinellidae). Three male-biased sex ratios, no (1:1), modest (1:2), and extreme (1:5) competition treatments, were formed using young, middle-aged, and old males. The reproductive performance of M. sexmaculatus at all ages under extreme competition (1:5) surpassed the other two treatments. More competition among males decreased the time of commencement of mating and increased the duration of copulation. Females laid a greater number of eggs in extreme competition treatments. The operational sex ratio (irrespective of age) had no significant effect on the total developmental duration of offspring. Among different age groups, older males took more time to commence mating and mated for longer durations in all the sex ratio treatments. The number of eggs in the first clutch was lowest when females were mated with older males with increased offspring development duration. Thus, it can be concluded that male-biased sex ratio elevates the performance of M. sexmaculatus. Among different age groups, older males were poor performers than young and middle-aged males.

scholarly journals To Jump or Cycle? Monitoring Neuromuscular Function in Rugby Union Players

2017 ◽  
Vol 12 (5) ◽  
pp. 690-696 ◽  
Author(s):  
Gregory Roe ◽  
Joshua Darrall-Jones ◽  
Kevin Till ◽  
Padraic Phibbs ◽  
Dale Read ◽  
...  
Keyword(s):  
Peak Power ◽  
Neuromuscular Function ◽  
Cycle Ergometer ◽  
Rugby Union ◽  
Flight Time ◽  
Neuromuscular Fatigue ◽  
Future Research ◽  
Mean Power ◽  
Training Block ◽  
Cycle Ergometer Test

Purpose:To evaluate changes in performance of a 6-s cycle-ergometer test (CET) and countermovement jump (CMJ) during a 6-wk training block in professional rugby union players.Methods:Twelve young professional rugby union players performed 2 CETs and CMJs on the 1st and 4th mornings of every week before the commencement of daily training during a 6-wk training block. Standardized changes in the highest score of 2 CET and CMJ efforts were assessed using linear mixed modeling and magnitude-based inferences.Results:After increases in training load during wk 3 to 5, moderate decreases in CMJ peak and mean power and small decreases in flight time were observed during wk 5 and 6 that were very likely to almost certainly greater than the smallest worthwhile change (SWC), suggesting neuromuscular fatigue. However, only small decreases, possibly greater than the SWC, were observed in CET peak power. Changes in CMJ peak and mean power were moderately greater than in CET peak power during this period, while the difference between flight time and CET peak power was small.Conclusion:The greater weekly changes in CMJ metrics in comparison with CET may indicate differences in the capacities of these tests to measure training-induced lower-body neuromuscular fatigue in rugby union players. However, future research is needed to ascertain the specific modes of training that elicit changes in CMJ and CET to determine the efficacy of each test for monitoring neuromuscular function in rugby union players.

scholarly journals Rate Of Velocity, Torque, And Power Development In Middle-Aged And Older Males

2019 ◽  
Vol 51 (Supplement) ◽  
pp. 42
Author(s):  
Matthew T. Stratton ◽  
Alex A. Almos ◽  
Phuong L. Ha ◽  
Alyssa R. Bailly ◽  
Micah J. Poisal ◽  
...  
Keyword(s):  
Middle Aged ◽  
Power Development ◽  
Older Males

scholarly journals Differential effects of mild therapeutic exercise during a period of inactivity on power generation in soleus type I single fibers with age

2012 ◽  
Vol 112 (10) ◽  
pp. 1752-1761 ◽  
Author(s):  
Jong-Hee Kim ◽  
LaDora V. Thompson
Keyword(s):  
Young Adult ◽  
Peak Power ◽  
Fiber Diameter ◽  
Weight Bearing ◽  
Age Groups ◽  
Exercise Program ◽  
Type I ◽  
Therapeutic Exercise ◽  
Middle Aged ◽  
Single Fibers

The purpose of this study was to investigate the effects of mild therapeutic exercise (treadmill) in preventing the inactivity-induced alterations in contractile properties (e.g., power, force, and velocity) of type I soleus single fibers in three different age groups. Young adult (5- to 12-mo-old), middle-aged (24- to 31-mo-old), and old (32- to 40-mo-old) F344BNF1 rats were randomly assigned to three experimental groups: weight-bearing control (CON), non-weight bearing (NWB), and NWB with exercise (NWBX). NWB rats were hindlimb suspended for 2 wk, representing inactivity. The NWBX rats were hindlimb suspended for 2 wk and received therapeutic exercise on a treadmill four times a day for 15 min each. Peak power and isometric maximal force were reduced following hindlimb suspension (HS) in all three age groups. HS decreased fiber diameter in young adult and old rats (−21 and −12%, respectively). Specific tension (isometric maximal force/cross-sectional area) was significantly reduced in both the middle-aged (−36%) and old (−23%) rats. The effects of the mild therapeutic exercise program on fiber diameter and contractile properties were age specific. Mild treadmill therapeutic exercise attenuated the HS-induced reduction in fiber diameter (+17%, 93% level of CON group) and peak power (μN·fiber length·s−1) (+46%, 63% level of CON group) in young adult rats. In the middle-aged animals, this exercise protocol improved peak power (+60%, 100% level of CON group) and normalized power (kN·m−2·fiber length·s−1) (+45%, 108% level of CON group). Interestingly, treadmill exercise resulted in a further reduction in shortening velocity (−42%, 67% level of CON group) and specific tension (−29%, 55% level of CON group) in the old animals. These results suggest that mild treadmill exercise is beneficial in attenuating and preventing inactivity-induced decline in peak power of type I soleus single fibers in young adult and middle-aged animals, respectively. However, this exercise program does not prevent the HS-induced decline in muscle function in the old animals.

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