Effect of the Simultaneous Application of NMES and HVPC on Knee Extension Torque

2007 ◽  
Vol 16 (4) ◽  
pp. 307-318 ◽  
Author(s):  
William Holcomb ◽  
Mack D. Rubley ◽  
Tedd J. Girouard
Keyword(s):  
Electrical Stimulation ◽  
Athletic Training ◽  
Outcome Measure ◽  
Peak Torque ◽  
Knee Extension ◽  
Stimulation Protocol ◽  
Simultaneous Application ◽  
Efficient Treatment ◽  
Main Outcome Measure ◽  
Isometric Knee Extension

Context:Electrical stimulation using simultaneous application of two current types for multiple effects is a current treatment option, but the effect of this treatment is not currently known.Objectives:To compare isometric knee extension torque when using neuromuscular electrical stimulation (NMES) in combination with High Voltage Pulsed Current (HVPC) versus NMES alone during three contraction conditions of quadriceps.Design:Counterbalanced, within-subjects design to test independent variables, stimulation protocol, and contraction condition; ANOVA to analyze dependent variable, peak torque.Setting:Athletic Training Research Laboratory. Participants: 14 healthy subjects (7 male and 7 female, age = 21.9 ± 2.0 yr, height = 173.4 ± 10.1cm, weight = 76.1 ± 16.7 kg).Intervention:Participants performed three contraction conditions during two stimulation protocols.Main Outcome Measure:Peak isometric knee extension torque.Results:The main effect for Stimulation Protocol was not significant: F1,26 = .01, P = .94.Conclusion:Simultaneous application of HVPC with NMES does not facilitate the neuromuscular response but may provide an efficient treatment when managing atrophy, strength loss, pain, and edema associated with reconstructive surgery.

The Effect of Rest Intervals on Knee-Extension Torque Production with Neuromuscular Electrical Stimulation

2006 ◽  
Vol 15 (2) ◽  
pp. 116-124 ◽  
Author(s):  
William R. Holcomb ◽  
Mack D. Rubley ◽  
Michael G. Miller ◽  
Tedd J. Girouard
Keyword(s):  
Electrical Stimulation ◽  
Athletic Training ◽  
Outcome Measure ◽  
Neuromuscular Electrical Stimulation ◽  
Knee Extension ◽  
Rest Interval ◽  
Maximum Voluntary Isometric Contraction ◽  
Main Outcome Measure ◽  
Main Effect ◽  
Rest Intervals

Context:Previous studies using neuromuscular electrical stimulation (NMES) have suggested that 30-second rest intervals are too short for sufficient recovery.Objective:To compare the effect of rest interval on knee-extension torque production.Design:Counterbalanced mixed design to test independent variable, rest interval; ANOVA to analyze dependent variable, percentage decline.Setting:Athletic training research laboratory.Participants:24 healthy men and women.Intervention:Participants performed knee extension under 2 contraction conditions, maximum voluntary isometric contraction (MVIC) and NMES with either 30- or 120-second rest between repetitions.Main Outcome Measure:Peak torque produced during each repetition of a 5-repetition set.Results:The main effect for rest interval was significant (F1,23= 30.30,P= .001), as was the main effect for condition (F1,23= 11.18,P= .003).Conclusions:A 120-second rest between repetitions is recommended when using NMES in early rehabilitation because force decline across repetitions with 30-second rest during NMES is greater than with MVIC.

A Comparison of Knee-Extension Torque Production with Biphasic versus Russian Current

2000 ◽  
Vol 9 (3) ◽  
pp. 229-239 ◽  
Author(s):  
William R. Holcomb ◽  
Shahin Golestani ◽  
Shante Hill
Keyword(s):  
Athletic Training ◽  
High Intensity ◽  
Repeated Measures ◽  
Outcome Measure ◽  
Maximum Voluntary Contraction ◽  
Neuromuscular Electrical Stimulation ◽  
Strength Loss ◽  
Knee Extension ◽  
Voluntary Contraction ◽  
Main Outcome Measure

Context:Neuromuscular electrical stimulation (NMES) can be used to prevent the atrophy and strength loss associated with immobilization.Objective:To compare the effects of biphasic current and the modulated “Russian” current on muscular torque production during different contraction conditions.Design, Setting, and Participants:In a within-subjects design, 10 healthy subjects in an athletic training laboratory received NMES.Interventions:Isometric knee-extension torque was recorded with the Biodex™ under 4 conditions: maximum voluntary contraction (MVC; control), MVC superimposed with low-intensity stimulation (sham), MVC superimposed with high-intensity stimulation, and high-intensity stimulation only.Main Outcome Measure:Data normalized for body weight were analyzed using a 2 (current type) X 4 (condition) repeated-measures analysis of variance.Results:The main effect for current type was not significant, F1,9 = .03, P = .87.

The Effects of Superficial Heating before 1-MHz Ultrasound on Tissue Temperature

2003 ◽  
Vol 12 (2) ◽  
pp. 95-103 ◽  
Author(s):  
William R. Holcomb ◽  
Chris Blank
Keyword(s):  
Athletic Training ◽  
Repeated Measures ◽  
Outcome Measure ◽  
Tissue Temperature ◽  
Temperature Elevation ◽  
Main Outcome Measure ◽  
Cooling Period ◽  
Dependent Variables ◽  
Within Subjects ◽  
Independent Variable

Context:Ultrasound significantly raises tissue temperature, but the time of temperature elevation is short.Objective:To assess the effectiveness of superficial preheating on temperature elevation and decline when using ultrasound.Design:Within-subjects design to test the independent variable, treatment condition; repeated-measures ANOVAs to analyze the dependent variables, temperature elevation and decline.Setting:Athletic training laboratory.Intervention:Temperature at a depth of 3.75 cm was measured during ultrasound after superficial heating and with ultrasound alone.Subjects:10 healthy men.Main Outcome Measure:Temperature was recorded every 30 s during 15 min of ultrasound and for 15 min afterward.Results:Temperature elevation with ultrasound was significantly greater with preheating (4.0 ± 0.21 °C) than with ultrasound alone (3.0 ± 0.22 °C). Temperature decline was not significantly different between preheating and ultrasound alone.Conclusions:Superficial preheating significantly increases temperature elevation but has no effect on temperature decline during a 15-min cooling period.

Kilohertz and Low-Frequency Electrical Stimulation With the Same Pulse Duration Have Similar Efficiency for Inducing Isometric Knee Extension Torque and Discomfort

2017 ◽  
Vol 96 (6) ◽  
pp. 388-394 ◽  
Author(s):  
Flávia Vanessa Medeiros ◽  
Martim Bottaro ◽  
Amilton Vieira ◽  
Tiago Pires Lucas ◽  
Karenina Arrais Modesto ◽  
...  
Keyword(s):  
Electrical Stimulation ◽  
Pulse Duration ◽  
Low Frequency ◽  
Knee Extension ◽  
Isometric Knee Extension

scholarly journals Development of a Measure of Rehabilitation Adherence for Athletic Training

2010 ◽  
Vol 19 (3) ◽  
pp. 249-267 ◽  
Author(s):  
Megan D. Granquist ◽  
Diane L. Gill ◽  
Renee N. Appaneal
Keyword(s):  
Clinical Practice ◽  
Athletic Training ◽  
Outcome Measure ◽  
Athletic Trainers ◽  
Certified Athletic Trainers ◽  
Main Outcome Measure ◽  
Optimal Outcomes ◽  
Training Facility ◽  
Rehabilitation Adherence ◽  
Good Internal Consistency

Context:Rehabilitation adherence is accepted as a critical component for attaining optimal outcomes. Poor adherence is recognized as a problem in the athletic training setting. Measurement has been inconsistent, and no measure has been developed for athletic training settings.Objective:To identify indicators of sportinjury rehabilitation adherence relevant to athletic training and develop a Rehabilitation Adherence Measure for Athletic Training (RAdMAT) based on these indicators.Design:Mixed methods, 3 steps.Setting:College athletic training facility.Participants:Practicing certified athletic trainers (ATCs; n = 7) generated items, experts (n = 12) reviewed them, and practicing ATCs (n = 164) completed the RAdMAT for their most, average, and least adherent athlete.Main Outcome Measure:RAdMAT.Results:The RAdMAT is 16 items with 3 subscales. Subscales and total have good internal consistency and clearly discriminate among adherence levels.Conclusions:The RAdMAT is based on scholarly literature and clinical practice, making it particularly appropriate for use in athletic training clinical practice or for research purposes.

College Athletes’ Expectations About Injury Rehabilitation With an Athletic Trainer

2012 ◽  
Vol 17 (4) ◽  
pp. 18-25 ◽  
Author(s):  
Joe Hart ◽  
Damien Clement ◽  
Jordan Hamson-Utley ◽  
Monna Arvinen-Barrow ◽  
Cindra Kamphoff ◽  
...  
Keyword(s):  
Athletic Training ◽  
Student Athletes ◽  
Female Athletes ◽  
Outcome Measure ◽  
Prior Experience ◽  
Athletic Trainer ◽  
Male Athletes ◽  
Injury Rehabilitation ◽  
Rehabilitation Process ◽  
Main Outcome Measure

Context:Injured athletes begin the rehabilitation process with expectations about the nature of the working relationship with an athletic trainer. These expectations can infuence the effectiveness of the assistance provided.Objective:To determine whether male and female athletes differed in terms of expectations about injury rehabilitation services with an athletic trainer.Design:A questionnaire was administered to student athletes that assessed expectations about injury rehabilitation. Setting: Five colleges and universities.Patients or Other Participants:Questionnaire responses were provided by 679 student athletes (443 males and 236 females).Main Outcome Measure:Responses to the Expectations about Athletic Training questionnaire were used to assess factors identifed as Personal Commitment, Facilitative Conditions, Athletic Trainer Expertise, and Realism.Results:A statistically signifcant interaction between gender and prior experience was identifed. Male athletes with no prior experience had lower expectations for a facilitative environment. Female athletes with prior experience were less likely to have realistic expectations.Conclusions:Gender and prior experience infuence athletes’ expectations of injury rehabilitation with an athletic trainer.

scholarly journals Disparate kinetics of change in responses to electrical stimulation at the thoracic and lumbar level during fatiguing isometric knee extension

2020 ◽  
Vol 128 (1) ◽  
pp. 159-167 ◽  
Author(s):  
Callum G. Brownstein ◽  
Robin Souron ◽  
Nicolas Royer ◽  
Benjamin Singh ◽  
Thomas Lapole ◽  
...  
Keyword(s):  
Electrical Stimulation ◽  
Evoked Potential ◽  
Isometric Exercise ◽  
Silent Period ◽  
Knee Extension ◽  
Lower Limbs ◽  
Evoked Responses ◽  
Time Points ◽  
Isometric Knee Extension ◽  
Kinetics Of

The present study compared the fatigue-induced change of matched-amplitude thoracic evoked potential (TMEP) and lumbar evoked potential (LEP) following electrical stimulation. Ten participants performed a 3 × 3 min isometric knee extension contraction separated by 4 min of recovery at the level of EMG required to produce 50% maximal voluntary contraction (MVC) force at baseline. The TMEP and LEP were evoked during the ongoing contraction at baseline and every minute into the fatiguing protocol and during recovery. Both responses were also assessed during a transcranial magnetic stimulation (TMS) evoked silent period to elicit a TMS-TMEP and TMS-LEP to assess responses without the confounding influence of descending drive. The results displayed disparate kinetics of the TMS-TMEP and TMS-LEP throughout the fatiguing protocol. The TMS-TMEP was reduced at all time points during exercise ( P < 0.001), whereas the TMS-LEP was reduced at 2 min into set 1 and 1 min into sets 2 and 3 ( P ≤ 0.04). TMS-LEPs were higher than the TMS-TMEPs at most time points ( P ≤ 0.04). No change was observed in the TMEP or LEP. When evoked during the silent period, the reduction in TMEP is greater than the LEP during fatiguing isometric exercise. The disparate kinetics of change suggest that differential mechanisms are responsible for evoked responses to thoracic and lumbar stimulation. More research is required to identify the mechanisms responsible for the TMEP and LEP before precise inferences can be made on what fatigue-induced changes in these variables reflect. NEW & NOTEWORTHY Assessing spinal excitability using lumbar stimulation when measuring responses in lower limbs has been suggested as an alternative method that could circumvent the issues associated with thoracic stimulation. The present study compared responses to the two types of stimuli throughout a fatiguing protocol and demonstrated that lumbar evoked responses differ substantially from thoracic responses when measured in the absence of voluntary drive. These findings suggest that different mechanisms are responsible for evoked responses to thoracic and lumbar stimuli.

Comparison between the effects of 4 different electrical stimulation current waveforms on isometric knee extension torque and perceived discomfort in healthy women

2014 ◽  
Vol 51 (1) ◽  
pp. 76-82 ◽  
Author(s):  
Lucas Ogura Dantas ◽  
Amilton Vieira ◽  
Aristides Leite Siqueira ◽  
Tania Fatima Salvini ◽  
João Luiz Quagliotti Durigan
Keyword(s):  
Electrical Stimulation ◽  
Knee Extension ◽  
Healthy Women ◽  
Isometric Knee Extension ◽  
Stimulation Current

The Effect of Pelvic Position on Popliteal Angle Achieved During 90:90 Hamstring-Length Test

2013 ◽  
Vol 22 (4) ◽  
pp. 254-256 ◽  
Author(s):  
Lee Herrington
Keyword(s):  
Repeated Measures ◽  
Human Performance ◽  
Outcome Measure ◽  
Muscle Length ◽  
Knee Extension ◽  
Hamstring Muscle ◽  
Indirect Measure ◽  
Main Outcome Measure ◽  
Starting Position ◽  
Pelvic Position

Context:Hamstring muscle length is commonly measured because of its perceived relationship to injury of both the hamstrings themselves and the pelvis and lumbar spine. The popliteal (knee-extension) angle measured from the starting position hip and knee at 90° is a commonly used indirect measure of hamstring muscle length. When this measure has been undertaken in the literature previously, little attention was paid to the position of the pelvis, which may significantly influence measurements taken.Design:Repeated-measures.Setting:University human performance laboratory.Participants:60 healthy physically active males (mean age 20.1 ± 1.8 y, range 18–24 y).Intervention:The 2 extremes of pelvic position (anterior and posterior).Main Outcome Measure:Popliteal angle (with maximal knee extension) was measured in 2 positions, 1 of full anterior and 1 of full posterior pelvic tilt.Results:The mean difference in popliteal angle between anterior to posterior pelvic positions was 13.4° ± 9° (range 0–26°); this was statistically significant (P = .0001).Conclusion:The findings of the study indicate that pelvic position has a significant effect on popliteal angle and therefore should be taken into account when measuring hamstring muscle length.

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