Anticipatory responses of catecholamines on muscle force production

2007 ◽  
Vol 102 (1) ◽  
pp. 94-102 ◽  
Author(s):  
Duncan N. French ◽  
William J. Kraemer ◽  
Jeff S. Volek ◽  
Barry A. Spiering ◽  
Daniel A. Judelson ◽  
...  
Keyword(s):  
Resistance Exercise ◽  
Muscle Force ◽  
Venous Blood ◽  
Area Under The Curve ◽  
Force Production ◽  
Blood Collection ◽  
Experimental Conditions ◽  
Few Data ◽  
Muscle Force Production

Few data exist on the temporal relationship between catecholamines and muscle force production in vivo. The purpose of this study was to examine the influence of preexercise arousal on sympathoadrenal neurohormones on muscular force expression during resistance exercise. Ten resistance-trained men completed two experimental conditions separated by 7 days: 1) acute heavy resistance exercise protocol (AHREP; 6 × 10 repetitions parallel squats, 80% 1 repetition maximum) and 2) control (Cont; rest). Peak force (Fpeak) was recorded during a maximal isometric squat preceding each set and mean force (Fmean) was measured during each set. Serial venous blood samples were collected before the AHREP and immediately preceding each set. Blood collection times were matched during Cont. Preexercise epinephrine (Epi), norepinephrine (NE), and dopamine (DA) increased ( P ≤ 0.05) above Cont by 270, 255, and 164%, respectively. During exercise, Epi, NE, and DA continued to increase by 512, 271, and 38%, respectively, above preexercise values. Fpeak and Fmean decreased by ∼20–25% over the course of the AHREP. Post hoc data analysis revealed that five subjects (Fmaintainers) showed no decline ( P ≥ 0.05) in muscular performance (Fpeak, Fmean) during AHREP and that five subjects (Freducers) had significant reductions in Fpeak and Fmean. Integrated area under the curve for Epi, NE, and Fpeak were greater ( P < 0.02) for Fmaintainers than Freducers. In conclusion, an anticipatory rise in catecholamines existed, which may be essential for optimal force production at the onset of exercise.

scholarly journals The metabolic cost of in vivo constant muscle force production at zero net mechanical work

2019 ◽  
Vol 222 (8) ◽  
pp. jeb199158 ◽  
Author(s):  
Tim J. van der Zee ◽  
Koen K. Lemaire ◽  
Arthur J. van Soest
Keyword(s):  
Muscle Force ◽  
Force Production ◽  
Metabolic Cost ◽  
Mechanical Work ◽  
Muscle Force Production

Does Raising Morning Rectal Temperature to Evening Levels Offset the Diurnal Variation in Muscle Force Production?

2013 ◽  
Vol 30 (4) ◽  
pp. 486-501 ◽  
Author(s):  
Ben J. Edwards ◽  
Samuel A. Pullinger ◽  
Jonathan W. Kerry ◽  
William R. Robinson ◽  
Tom P. Reilly ◽  
...  
Keyword(s):  
Diurnal Variation ◽  
Rectal Temperature ◽  
Muscle Force ◽  
Force Production ◽  
Muscle Force Production

Muscle force production and functional performance in spastic cerebral palsy: Relationship of cocontraction

2000 ◽  
Vol 81 (7) ◽  
pp. 895-900 ◽  
Author(s):  
Diane L. Damiano ◽  
Tracy L. Martellotta ◽  
Daniel J. Sullivan ◽  
Kevin P. Granata ◽  
Mark F. Abel
Keyword(s):  
Cerebral Palsy ◽  
Muscle Force ◽  
Functional Performance ◽  
Force Production ◽  
Spastic Cerebral Palsy ◽  
Relationship Of ◽  
Muscle Force Production

Single-Use Versus Multiple-Use Electrodes for Sensory and Motor Threshold Amplitudes and Muscle Force Production

2013 ◽  
Vol 5 (3) ◽  
pp. 123-128
Author(s):  
David O. Draper ◽  
Lucia Maloy ◽  
J. Ty Hopkins ◽  
A. Wayne Johnson ◽  
Dennis Eggett ◽  
...  
Keyword(s):  
Muscle Force ◽  
Force Production ◽  
Multiple Use ◽  
Motor Threshold ◽  
Single Use ◽  
Muscle Force Production

scholarly journals Effect of Fatigue Protocols on Upper Extremity Neuromuscular Function and Implications for Ulnar Collateral Ligament Injury Prevention

2019 ◽  
Vol 7 (12) ◽  
pp. 232596711988887 ◽  
Author(s):  
Toufic R. Jildeh ◽  
Kelechi R. Okoroha ◽  
Joseph S. Tramer ◽  
Jorge Chahla ◽  
Benedict U. Nwachukwu ◽  
...  
Keyword(s):  
Systematic Review ◽  
Injury Prevention ◽  
Upper Extremity ◽  
Muscle Force ◽  
Force Production ◽  
Ulnar Collateral Ligament ◽  
Neuromuscular Function ◽  
Inclusion Criteria ◽  
Collateral Ligament ◽  
Muscle Force Production

Background: As the incidence of overuse injuries to the medial elbow in overhead athletes continues to rise, recent evidence suggests a link between these injuries and alterations in biomechanics produced by athlete fatigue. Previous studies have evaluated the effect of fatigue on elbow injuries using a wide array of fatigue protocols/athletic tasks, and, as a consequence, the results have been heterogeneous. Purpose: To determine whether there is a uniform alteration in neuromuscular function or biomechanics as the overhead athlete fatigues. Furthermore, this study sought to determine whether player fatigue should be accounted for in ulnar collateral ligament (UCL) injury prevention programs. Study Design: Systematic review. Methods: A systematic review of the literature using PubMed and MEDLINE databases was performed. Keywords included fatigue, upper extremity, baseball, pitcher, throwing, and muscle activity. Inclusion criteria consisted of original research articles in the English language involving healthy athletes, use of fatigue protocols, and the evaluation of at least 1 upper limb biomechanical variable. Results: A total of 35 studies involving 644 athletes (90 females, 554 males; mean age, 20.2 years) met the inclusion criteria. General fatigue protocols were used in 2 investigations, peripheral protocols were used in all 35 studies, and 5 different athletic tasks were studied (simulated baseball game, overhead throwing, high-effort swimming, simulated tennis game, and overhead serving). There was a uniform decrease in muscle force production and proprioception in athletes after completing a fatigue protocol. However, there was no consistency among studies when evaluating other important upper limb biomechanical factors. The fatigue protocols did not consistently produce statistically significant changes in elbow torque, pitching biomechanics, or ball velocity. Conclusion: A uniform decrease in muscle force production and proprioception was found after fatigue protocols; however, a majority of fatigue protocols published in the current literature are inconsistently measured and produce heterogeneous results. Therefore, currently, no recommendations can be made for changes in UCL injury prevention training programs to account for potential effects of fatigue. The effect of muscle force production and proprioception on upper extremity injuries should be evaluated in future studies.

Effects of an Amino Acid/Creatine Energy Supplement on the Acute Hormonal Response to Resistance Exercise

2007 ◽  
Vol 17 (6) ◽  
pp. 608-623 ◽  
Author(s):  
Nicholas A. Ratamess ◽  
Jay R. Hoffman ◽  
Ryan Ross ◽  
Miles Shanklin ◽  
Avery D. Faigenbaum ◽  
...  
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Resistance Exercise ◽  
Venous Blood ◽  
Area Under The Curve ◽  
Essential Amino Acids ◽  
Total Testosterone ◽  
Hormonal Response ◽  
Energy Supplement ◽  
And Performance

The authors aimed to examine the acute hormonal and performance responses to resistance exercise with and without prior consumption of an amino acid/creatine/energy supplement. Eight men performed a resistance-exercise protocol at baseline (BL), 20 min after consuming a supplement (S) consisting of essential amino acids, creatine, taurine, caffeine, and glucuronolactone or a maltodextrin placebo (P). Venous blood samples were obtained before and immediately after (IP), 15 min (15P), and 30 min (30P) after each protocol. Area under the curve of resistance-exercise volume revealed that BL was significantly less than S (10%) and P (8.6%). For fatigue rate, only S (18.4% ± 12.0%) was significantly lower than BL (32.9% ± 8.4%). Total testosterone (TT) and growth hormone (GH) were significantly elevated at IP and 15P in all conditions. The GH response was significantly lower, however, in S and P than in BL. The TT and GH responses did not differ between S and P. These results indicated that a supplement consisting of amino acids, creatine, taurine, caffeine, and glucuronolactone can modestly improve high-intensity endurance; however, the anabolic-hormonal response was not augmented.

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