Do neuromuscular adaptations occur in endurance-trained boys and men?

Cohen, Rotem; Mitchell, Cam; Dotan, Raffy; Gabriel, David; Klentrou, Panagiota; Falk, Bareket
August 2010
Applied Physiology, Nutrition & Metabolism;Aug2010, Vol. 35 Issue 4, p471
Academic Journal
Most research on the effects of endurance training has focused on endurance training's health-related benefits and metabolic effects in both children and adults. The purpose of this study was to examine the neuromuscular effects of endurance training and to investigate whether they differ in children (9.0-12.9 years) and adults (18.4-35.6 years). Maximal isometric torque, rate of torque development (RTD), rate of muscle activation (Q30), electromechanical delay (EMD), and time to peak torque and peak RTD were determined by isokinetic dynamometry and surface electromyography (EMG) in elbow and knee flexion and extension. The subjects were 12 endurance-trained and 16 untrained boys, and 15 endurance-trained and 20 untrained men. The adults displayed consistently higher peak torque, RTD, and Q30, in both absolute and normalized values, whereas the boys had longer EMD (64.7 ± 17.1 vs. 56.6 ± 15.4 ms) and time to peak RTD (98.5 ± 32.1 vs. 80.4 ± 15.0 ms for boys and men, respectively). Q30, normalized for peak EMG amplitude, was the only observed training effect (1.95 ± 1.16 vs. 1.10 ± 0.67 ms for trained and untrained men, respectively). This effect could not be shown in the boys. The findings show normalized muscle strength and rate of activation to be lower in children compared with adults, regardless of training status. Because the observed higher Q30 values were not matched by corresponding higher performance measures in the trained men, the functional and discriminatory significance of Q30 remains unclear. Endurance training does not appear to affect muscle strength or rate of force development in either men or boys.


Related Articles

  • AGE-RELATED EMG VARIABLES DURING MAXIMUM VOLUNTARY CONTRACTION. Yamada, Hiroshi; Masuda, Tadashi; Okada, Morihiko // Perceptual & Motor Skills;Aug2002, Vol. 95 Issue 1, p10 

    Examines the neuromuscular adaptation of tibialis anterior muscle occurring with aging. Decrease in the dorsiflexion force of the muscle; Affectation of neuromuscular system with selective atrophy of fast twitch fibers; Differences in the unit of motor firings.

  • Reflex inhibition during muscle fatigue in endurance-trained and sedentary individuals. Walton, David M.; Kuchinad, Raul A.; Ivanova, Tanya D.; Garland, Jayne S. // European Journal of Applied Physiology;Aug2002, Vol. 87 Issue 4/5, p462 

    Reflex inhibition of the motoneuron pool following fatiguing contractions may be mediated by the build-up of byproducts of fatigue. Endurance training is accompanied by neuromuscular adaptations that would alter the production and/or clearance of metabolic substrates. The purpose of the study...

  • Adaptation of left ventricular morphology to long-term training in sprint- and endurance-trained elite runners. Legaz-Arrese, Alejandro; González-Carretero, Mariano; Lacambra-Blasco, Isaac // European Journal of Applied Physiology;Apr2006, Vol. 96 Issue 6, p747 

    A correction to the article "Adaptation of Left Ventricular Morphology to Long-Term Training in Sprint- and Endurance-Trained Elite Runners" that was published in the 2005 issue is presented.

  • Basal testicular testosterone production in endurance-trained men is suppressed. Hackney, A. C.; Szczepanowska, E.; Viru, A. M. // European Journal of Applied Physiology;Apr2003, Vol. 89 Issue 2, p198 

    Research indicates that endurance-trained men have lower basal testosterone concentrations than age-matched sedentary control men. The physiological cause for this finding is uncertain. Therefore, we examined the peripheral component in the hypothalamic-pituitary-testicular (H-P-T) axis in...

  • Forecasts: Lifestyle. Brainard, Dulcy; Steinberg, Sybil S. // Publishers Weekly;9/2/1996, Vol. 243 Issue 36, p125 

    Reviews the book `The Wonder of Boys: What Parents, Mentors and Educators Can Do to Shape Young Boys Into Exceptional Men,' by Michael Gurian.

  • Nonfiction: Technology. McCombie, Brian // Booklist;10/1/96, Vol. 93 Issue 3, p313 

    Reviews the book `The Wonder of Boys: What Parents, Mentors and Educators Can Do to Shape Young Boys Into Exceptional Men,' by Michael Gurian.

  • Reviews. Groombridge, Nic // British Journal of Criminology;Winter96, Vol. 36 Issue 1, p149 

    Reviews the book `Just Boys Doing Business? Men, Masculinities and Crime,' edited by Tim Newburn and Elizabeth Stanko.

  • PERCEIVED EXERTION SCALES ATTEST TO BOTH INTENSITY AND EXERCISE DURATION. Garcin, Murielle; Billat, Veronique // Perceptual & Motor Skills;Dec2001, Vol. 93 Issue 3, p661 

    Examines the relationships between perceived exertion and exercise duration of endurance-trained men. Measurement of maximal oxygen uptake; Velocity of lactate concentration threshold; Function of perceived exertion for health normal people.

  • High-Intensity Interval vs. Moderate Steady-State Exercise. Ciolac, Emmanuel G.; Carvalho, Vitor O.; Guimarães, Guilherme V. // American Journal of Hypertension;Aug2010, Vol. 23 Issue 8, p812 

    A letter to the editor is presented in response to the article "Postexercise Hypotension in an Endurance-Trained Population of Men and Women Following High-Intensity Interval and Steady-State Cycling," by Lindy Rossow and colleagues in the 2010 issue.


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics