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https://www.readbyqxmd.com/read/27422091/dmax-method-is-a-valid-procedure-to-estimate-physical-working-capacity-at-fatigue-threshold
#1
Joshua J Riffe, Jeffrey R Stout, David H Fukuda, Edward H Robinson, Amelia A Miramonti, Kyle S Beyer, Ran Wang Med, David D Church, Tyler W D Muddle, Jay R Hoffman
INTRODUCTION: The purpose of this study was to evaluate the validity of the maximal distance (Dmax)-EMG method for estimating physical working capacity at fatigue threshold (PWCFT ). METHODS: Twenty-one men and women (age: 22.9 ± 3.0 yrs) volunteered to perform 12 sessions of high-intensity interval training (HIIT) over 4 weeks. Pre- and post- HIIT training, a graded exercise test (GXT) was used to estimate PWCFT using Dmax and Original (ORG) methods. RESULTS: There was a significant increase in PWCFT for ORG (+10...
July 16, 2016: Muscle & Nerve
https://www.readbyqxmd.com/read/27361614/methodological-comparison-of-pwcft-estimation-in-response-to-high-intensity-interval-training-3045-board-110-june-3-2-00-pm-3-30-pm
#2
Joshua J Riffe, Jeffrey R Stout, Edward H Robinson, Amelia A Miramonti, Kyle S Beyer, Ran Wang, David D Church, Tyler W D Muddle, David H Fukuda, Jay R Hoffman
No abstract text is available yet for this article.
May 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/26609964/estimation-of-the-neuromuscular-fatigue-threshold-from-an-incremental-cycling-test-using-1-min-exercise-periods
#3
I Latasa, A Cordova, G Villa, G Quintana, J Rodriguez-Falces
The objectives of this study were: (1) to evaluate the method used for estimating the neuromuscular fatigue threshold from surface electromyographic amplitude (the PWCFT test) during a single incremental cycling workout using 1-min exercise periods, and (2) to investigate the possible associations between PWCFT and metabolic (onset of blood lactate accumulation, OBLA) and ventilatory (ventilatory threshold, VT, and respiratory compensation point, RCP) variables. Sixteen cyclists performed incremental cycle ergometer rides to exhaustion with bipolar surface sEMG signals recorded from the vastus lateralis...
November 26, 2015: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/26418369/effects-of-4-weeks-of-high-intensity-interval-training-and-%C3%AE-hydroxy-%C3%AE-methylbutyric-free-acid-supplementation-on-the-onset-of-neuromuscular-fatigue
#4
RANDOMIZED CONTROLLED TRIAL
Amelia A Miramonti, Jeffrey R Stout, David H Fukuda, Edward H Robinson, Ran Wang, Michael B La Monica, Jay R Hoffman
This study investigated the effects of high-intensity interval training (HIIT) and β-hydroxy-β-methylbutyric free acid (HMB) supplementation on physical working capacity at the onset of neuromuscular fatigue threshold (PWC(FT)). Thirty-seven participants (22 men, 15 women; 22.8 ± 3.4 years) completed an incremental cycle ergometer test (graded exercise test [GXT]); electromyographic amplitude from the right vastus lateralis was recorded. Assessments occurred preceding (PRE) and after 4 weeks of supplementation (POST)...
March 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/25957058/resistance-training-improves-capacity-to-delay-neuromuscular-fatigue-in-older-adults
#5
RANDOMIZED CONTROLLED TRIAL
Nadia S Emerson, Jeffrey R Stout, David H Fukuda, Edward H Robinson, Iv, Tyler C Scanlon, Kyle S Beyer, Maren S Fragala, Jay R Hoffman
The purpose of this study was to investigate the effects of short term resistance exercise on neuromuscular fatigue threshold (PWCFT), strength, functional performance, and body composition in older adults. Twenty-three participants (71.2 ± 6.0 yr) were randomly assigned to 6 weeks of resistance exercise (EXE) or control (CONT). A submaximal cycle ergometer test, physical working capacity at fatigue threshold, was used to determine PWCFT. Strength was assessed with predicted leg extension 1-RM and functional performance with time to complete 5 chair rises (CHAIR) and walk an 8-ft course (WALK)...
July 2015: Archives of Gerontology and Geriatrics
https://www.readbyqxmd.com/read/25781198/acute-effects-of-an-arginine-based-supplement-on-neuromuscular-ventilatory-and-metabolic-fatigue-thresholds-during-cycle-ergometry
#6
RANDOMIZED CONTROLLED TRIAL
Roksana B Zak, Clayton L Camic, Ethan C Hill, Molly M Monaghan, Attila J Kovacs, Glenn A Wright
The purpose of the present study was to examine the effects of an acute dose of an arginine-based supplement on the physical working capacity at the fatigue threshold (PWCFT), lactate threshold (LT), ventilatory threshold (VT), and peak oxygen uptake during incremental cycle ergometry. This study used a double-blinded, placebo-controlled, within-subjects crossover design. Nineteen untrained men (mean age ± SD = 22.0 ± 1.7 years) were randomly assigned to ingest either the supplement (3.0 g of arginine, 300 mg of grape seed extract, and 300 mg of polyethylene glycol) or placebo (microcrystalline cellulose) and performed an incremental test on a cycle ergometer for determination of PWCFT, LT, VT, and peak oxygen uptake...
April 2015: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/25186664/c-terminal-agrin-fragment-is-inversely-related-to-neuromuscular-fatigue-in-older-men
#7
Jeffrey R Stout, Maren S Fragala, Jay R Hoffman, Edward H Robinson, William P Mccormack, Jeremy R Townsend, Adam R Jatjner, Nadia S Emerson, Leonardo P Oliveira, David H Fukuda
INTRODUCTION: The aim of this study was to examine the relationship between serum C-terminal agrin fragment (CAF) concentrations and neuromuscular fatigue in older adults. METHODS: Twenty-two healthy older men and women volunteered for this study. Resting fasted blood samples were collected and prepared for measurement of serum CAF concentration by a commercially available ELISA kit. The onset of neuromuscular fatigue was measured by monitoring electromyographic fatigue curves from the vastus lateralis muscle using the physical working capacity at fatigue threshold (PWCFT ) test...
January 2015: Muscle & Nerve
https://www.readbyqxmd.com/read/24856645/physical-working-capacity-at-fatigue-threshold-pwcft-is-associated-with-sarcopenia-related-body-composition-and-measures-of-functionality-in-older-adults
#8
Nadia S Emerson, David H Fukuda, Jeffrey R Stout, Edward H Robinson, William P McCormack, Tyler C Scanlon, Ashlee M Warren, Adam J Wells, Adam M Gonzalez, Gerald T Mangine, Maren S Fragala, Jay R Hoffman
The relationship between PWCFT and common measures used to assess sarcopenia in older adults were examined. Fifty-eight older adults [age: 71.1 ± 6.2 years; body mass index (BMI): 28.0 ± 5.4 kg/m(2)] completed the testing procedures. Sarcopenia-related body composition was measured by dual-energy X-ray absorptiometry and participants performed a discontinuous cycle ergometry test to determine PWCFT. Functionality assessments included maximal isometric grip strength (GRIP) and sit-to-stand (STS) repetitions in 30s...
September 2014: Archives of Gerontology and Geriatrics
https://www.readbyqxmd.com/read/24796987/effects-of-6-weeks-of-aerobic-exercise-combined-with-conjugated-linoleic-acid-on-the-physical-working-capacity-at-fatigue-threshold
#9
RANDOMIZED CONTROLLED TRIAL
Nathaniel D M Jenkins, Samuel L Buckner, Robert B Baker, Haley C Bergstrom, Kristen C Cochrane, Joseph P Weir, Terry J Housh, Joel T Cramer
The purpose of this study was to examine the effects of conjugated linoleic acid (CLA) supplementation in conjunction with 6 weeks of aerobic exercise training on the physical working capacity at the fatigue threshold (PWCFT), timed sit-ups, and the standing long jump. Thirty-three untrained to moderately trained men (mean ± SD; age = 21.6 ± 2.8 years) participated in this double-blind, placebo-controlled study and were randomly assigned to either a CLA (Clarinol A-80; n = 17) or placebo (PLA; sunflower oil; n = 16) group...
August 2014: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/24021781/an-examination-of-neuromuscular-and-metabolic-fatigue-thresholds
#10
Haley C Bergstrom, Terry J Housh, Kristen C Cochrane, Nathaniel D M Jenkins, Robert W Lewis, Daniel A Traylor, Jorge M Zuniga, Richard J Schmidt, Glen O Johnson, Joel T Cramer
This study examined the relationships among the physical working capacity at the fatigue threshold (PWCFT), the power outputs associated with the gas exchange threshold (PGET) and the respiratory compensation point (PRCP), and critical power (CP) to identify possible physiological mechanisms underlying the onset of neuromuscular fatigue. Ten participants (mean ± SD age: 20 ± 1 years) performed a maximal incremental cycle ergometer test to determine the PWCFT, PGET, and PRCP. CP was determined from the 3 min all-out test...
October 2013: Physiological Measurement
https://www.readbyqxmd.com/read/23832078/oral-nutritional-supplement-fortified-with-beta-alanine-improves-physical-working-capacity-in-older-adults-a-randomized-placebo-controlled-study
#11
RANDOMIZED CONTROLLED TRIAL
William P McCormack, Jeffrey R Stout, Nadia S Emerson, Tyler C Scanlon, Ashlee M Warren, Adam J Wells, Adam M Gonzalez, Gerald T Mangine, Edward H Robinson, Maren S Fragala, Jay R Hoffman
This study examined the effects of an oral nutritional supplement fortified with two different doses of beta-alanine on body composition, muscle function and physical capacity in older adults. Using a double-blind placebo controlled design, 60 men and women (age ± SD = 70.7 ± 6.2 yrs) were randomly assigned to one of three treatment groups: 1) oral nutritional supplement (ONS; n = 20) (8 oz; 230 kcal; 12 g PRO; 31 g CHO; 6 g FAT), 2) ONS plus 800 mg beta-alanine (ONS800; n = 19), and 3) ONS plus 1200 mg beta-alanine (ONS1200; n = 21)...
September 2013: Experimental Gerontology
https://www.readbyqxmd.com/read/20589588/a-mechanomyographic-fatigue-threshold-test-for-cycling
#12
J M Zuniga, T J Housh, C L Camic, C R Hendrix, R J Schmidt, M Mielke, G O Johnson
The purposes of this study were twofold: 1) to derive the mechanomyographic mean power frequency fatigue threshold (MMG MPFFT) for submaximal cycle ergometry; and 2) to compare the power outputs associated to the MMG MPFFT to other neuromuscular and gas exchange fatigue thresholds. 9 adults (5 men and 4 women; mean+/-SD age=23.7+/-3.7 years; body weight=66.3+/-8.2 kg) performed an incremental cycle ergometry test to exhaustion while expired gas samples, electromyographic (EMG), and MMG signals were measured from the vastus lateralis muscle...
September 2010: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/20386475/effects-of-arginine-based-supplements-on-the-physical-working-capacity-at-the-fatigue-threshold
#13
RANDOMIZED CONTROLLED TRIAL
Clayton L Camic, Terry J Housh, Jorge M Zuniga, Russell C Hendrix, Michelle Mielke, Glen O Johnson, Richard J Schmidt
The purpose of the present study was to examine the effects of daily oral administration of arginine-based supplements for 4 weeks on the physical working capacity at the fatigue threshold (PWCFT). The PWCFT test is an electromyographic (EMG) procedure for estimating the highest power output that can be maintained without neuromuscular evidence of fatigue. The study used a double-blind, placebo-controlled design. Fifty college-aged men (mean age +/- SD = 23.9 +/- 3.0) were randomized into 1 of 3 groups: (a) placebo (n = 19); (b) 1...
May 2010: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/18992136/the-effect-of-beta-alanine-supplementation-on-neuromuscular-fatigue-in-elderly-55-92-years-a-double-blind-randomized-study
#14
Jeffrey R Stout, B Sue Graves, Abbie E Smith, Michael J Hartman, Joel T Cramer, Travis W Beck, Roger C Harris
BACKGROUND: Ageing is associated with a significant reduction in skeletal muscle carnosine which has been linked with a reduction in the buffering capacity of muscle and in theory, may increase the rate of fatigue during exercise. Supplementing beta-alanine has been shown to significantly increase skeletal muscle carnosine. The purpose of this study, therefore, was to examine the effects of ninety days of beta-alanine supplementation on the physical working capacity at the fatigue threshold (PWCFT) in elderly men and women...
2008: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/17985060/effects-of-creatine-supplementation-on-the-onset-of-neuromuscular-fatigue-threshold-and-muscle-strength-in-elderly-men-and-women-64-86-years
#15
RANDOMIZED CONTROLLED TRIAL
J R Stout, B Sue Graves, J T Cramer, E R Goldstein, P B Costa, A E Smith, A A Walter
OBJECTIVES: This study examined the effects of 14 days of creatine supplementation on the physical working capacity at fatigue threshold (PWCFT), maximal isometric grip strength (GRIP), sit-to-stand (STS), and body weight (BW) in elderly men and women. DESIGN: Using a double blind cross-over design, fifteen men (n = 7) and women (n = 8) (age +/- SD = 74.5 +/- 6.4 yrs) were randomly assigned to either the creatine (CR) (20g.d-1 during week 1 decreasing to 10g.d-1 at week 2) or Placebo (PL) group...
November 2007: Journal of Nutrition, Health & Aging
https://www.readbyqxmd.com/read/17136505/effects-of-beta-alanine-supplementation-on-the-onset-of-neuromuscular-fatigue-and-ventilatory-threshold-in-women
#16
RANDOMIZED CONTROLLED TRIAL
J R Stout, J T Cramer, R F Zoeller, D Torok, P Costa, J R Hoffman, R C Harris, J O'Kroy
This study examined the effects of 28 days of beta-alanine supplementation on the physical working capacity at fatigue threshold (PWCFT), ventilatory threshold (VT), maximal oxygen consumption (VO2-MAX), and time-to-exhaustion (TTE) in women. Twenty-two women (age+/-SD 27.4+/-6.1 yrs) participated and were randomly assigned to either the beta-alanine (CarnoSyn) or Placebo (PL) group. Before (pre) and after (post) the supplementation period, participants performed a continuous, incremental cycle ergometry test to exhaustion to determine the PWCFT, VT, VO2-MAX, and TTE...
2007: Amino Acids
https://www.readbyqxmd.com/read/8851535/effect-of-workbout-duration-on-the-physical-working-capacity-at-fatigue-threshold-pwcft-test
#17
T K Evetovich, T J Housh, G O Johnson, S A Evans, J R Stout, A J Bull, D B Smith, M M Evetovich
The purpose of this study was twofold: (1) to determine the effect of increasing the duration of the workbout at each power output during the physical working capacity at fatigue threshold (PWCFT) test from 2 to 3 or 4 min, and (2) to examine the time to exhaustion during continuous workbouts at the PWCFT. Twelve adult males (means +/- SD = 22.4 +/- 3.0 years) volunteered to perform three PWCFT tests using workbout durations of 2, 3, and 4 min. Following the determination of the PWCFT values, nine of the subjects performed continuous workbouts at PWCFT2 and PWCFT4 for as long as possible...
February 1996: Ergonomics
https://www.readbyqxmd.com/read/8803497/neuromuscular-fatigue-thresholds-of-the-vastus-lateralis-vastus-medialis-and-rectus-femoris-muscles
#18
COMPARATIVE STUDY
T J Housh, H A deVries, G O Johnson, S A Evans, D J Housh, J R Stout, R M Bradway, T K Evetovich
The purpose of this study was to compare the power outputs associated with the onset of neuromuscular fatigue in the superficial muscles of the quadriceps femoris group by simultaneously monitoring the EMG activity from the vastus lateralis (VL), vastus medialis (VM) and rectus femoris (RF) muscles during a Physical Working Capacity at the Fatigue Threshold (PWCFT) test. Eleven adult males (mean +/- SD = 24 +/- 3y) served as subjects. There were no significant (p > 0.05) differences among the mean PWCFT values for the VL (226 +/- 58 W), VM (223 +/- 58 W) and RF (203 +/- 54 W) muscles...
June 1996: Electromyography and Clinical Neurophysiology
https://www.readbyqxmd.com/read/3691473/a-method-for-estimating-physical-working-capacity-at-the-fatigue-threshold-pwcft
#19
COMPARATIVE STUDY
H A deVries, M W Tichy, T J Housh, K D Smyth, A M Tichy, D J Housh
No abstract text is available yet for this article.
August 1987: Ergonomics
https://www.readbyqxmd.com/read/2806227/estimating-physical-working-capacity-and-training-changes-in-the-elderly-at-the-fatigue-threshold-pwcft
#20
H A deVries, G R Brodowicz, L D Robertson, M D Svoboda, J S Schendel, A M Tichy, M W Tichy
The test for estimating physical working capacity at the fatigue threshold (PWCft), previously validated for young men, was evaluated for use with elderly men and women. A sample of 27 volunteer subjects (67.6 +/- 5.6 years, 11 male, 16 female) was divided into three matched groups: (1) controls (n = 10), (2) low intensity (70% PWCft) training group (n = 10) and (3) high intensity (85% PWCft) training group (n = 7). The subjects were tested for PWCft before and after 10 weeks of exercise training on cycle ergometers (30 min/day, 3 days/week)...
August 1989: Ergonomics
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