Comparison of Diagonal Shoulder Exercises With and Without Visual Trace

2015 ◽  
Vol 20 (1) ◽  
pp. 52-56
Author(s):  
Jwa-jun Kim ◽  
So-youn Ann ◽  
Se-yeon Park
Keyword(s):  
Repeated Measures ◽  
Muscle Activation ◽  
Outcome Measure ◽  
Specific Pattern ◽  
Repeated Measure ◽  
Serratus Anterior ◽  
Additional Advantage ◽  
Main Outcome Measure ◽  
Anterior Deltoid ◽  
Lower Trapezius

Objectives:The aim of this study was to investigate the effects of visual trace on shoulder muscle activation during diagonal pattern of exercises. Sixteen healthy male participants volunteered to participate.Design:Repeated-measure design.Setting:Laboratory setting.Participants:Sixteen physically active male participants volunteered to participate.Intervention:Five muscles of the shoulder were investigated during standing performance of diagonal shoulder exercises with and without visual trace. Two patterns of the diagonal exercises were used: diagonal 1 flexion (D1F) and diagonal 2 fexion (D2F). Two-way repeated measures analysis of variance was used, with factors being the presence of visual trace and exercise variations.Main Outcome Measure:Electromyography (EMG).Results:The average muscle activity values of the lower trapezius and anterior deltoid were higher with the D2F compared with the D1F (P < .05). The visual trace effect was observed within the serratus anterior, with values significantly greater in exercise with visual trace (P < .05). There was a significant increase of the lower trapezius during the exercise with the visual trace condition compared with the exercise without visual trace, which was only observed during D2F (P < .05).Conclusions:Present results suggest that the D2F exercise pattern is effective for activating lower trapezius and anterior deltoid muscles. The visual trace condition has the additional advantage of activating the scapulothoracic muscle activities depending on the specific pattern of diagonal shoulder exercise.

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.

scholarly journals Shoulder External Rotation Fatigue and Scapular Muscle Activation and Kinematics in Overhead Athletes

2011 ◽  
Vol 46 (4) ◽  
pp. 349-357 ◽  
Author(s):  
Mithun Joshi ◽  
Charles A. Thigpen ◽  
Kevin Bunn ◽  
Spero G. Karas ◽  
Darin A. Padua
Keyword(s):  
Muscle Fatigue ◽  
Muscle Activation ◽  
External Rotation ◽  
Shoulder Injuries ◽  
Serratus Anterior ◽  
Overhead Athletes ◽  
Scapular Kinematics ◽  
Fatigue Protocol ◽  
Upper Trapezius ◽  
Lower Trapezius

Context: Glenohumeral external rotation (GH ER) muscle fatigue might contribute to shoulder injuries in overhead athletes. Few researchers have examined the effect of such fatigue on scapular kinematics and muscle activation during a functional movement pattern. Objective: To examine the effects of GH ER muscle fatigue on upper trapezius, lower trapezius, serratus anterior, and infraspinatus muscle activation and to examine scapular kinematics during a diagonal movement task in overhead athletes. Setting: Human performance research laboratory. Design: Descriptive laboratory study. Patients or Other Participants: Our study included 25 overhead athletes (15 men, 10 women; age = 20 ± 2 years, height = 180 ± 11 cm, mass = 80 ± 11 kg) without a history of shoulder pain on the dominant side. Intervention(s): We tested the healthy, dominant shoulder through a diagonal movement task before and after a fatiguing exercise involving low-resistance, high-repetition, prone GH ER from 0° to 75° with the shoulder in 90° of abduction. Main Outcome Measure(s): Surface electromyography was used to measure muscle activity for the upper trapezius, lower trapezius, serratus anterior, and infraspinatus. An electromyographic motion analysis system was used to assess 3-dimensional scapular kinematics. Repeated-measures analyses of variance (phase × condition) were used to test for differences. Results: We found a decrease in ascending-phase and descending-phase lower trapezius activity (F1,25 = 5.098, P = .03) and an increase in descending-phase infraspinatus activity (F1,25 = 5.534, P = .03) after the fatigue protocol. We also found an increase in scapular upward rotation (F1,24 = 3.7, P = .04) postfatigue. Conclusions: The GH ER muscle fatigue protocol used in this study caused decreased lower trapezius and increased infraspinatus activation concurrent with increased scapular upward rotation range of motion during the functional task. This highlights the interdependence of scapular and glenohumeral force couples. Fatigue-induced alterations in the lower trapezius might predispose the infraspinatus to injury through chronically increased activation.

Predictors of Recovery Time

2000 ◽  
Vol 9 (1) ◽  
pp. 62-76 ◽  
Author(s):  
Ann M. Quinn ◽  
Barry J. Fallon
Keyword(s):  
Social Support ◽  
Repeated Measures ◽  
Recovery Time ◽  
Outcome Measure ◽  
Emotional Responses ◽  
Partial Recovery ◽  
Psychological Variables ◽  
Main Outcome Measure ◽  
Rehabilitation Programs ◽  
Type Design

Objective:To explore predictors of recovery time.Design:Repeated measures on 4 occasions throughout recovery included injury appraisal, demographics, emotional responses, and psychological variables.Participants:Elite injured athletes (N= 136).Main Outcome Measure:Recovery time.Results:At all phases, being a team athlete was a significant predictor of faster recovery. At partial recovery (approximately one-third of the recovery time), significant predictors were active coping, confidence of reaching full recovery in the estimated time, not completing rehabilitation, and having less social support. By semirecovery (approximately two-thirds of the recovery time), vigor and using denial significantly predicted quicker recovery. At recovery, having previously suffered a serious nonsporting injury or illness, vigor, more confidence, and intensity of effort significantly predicted faster recovery.Conclusions:This study has expanded on and refined the work in this area and will help increase understanding of the role that psychological variables play in decreasing recovery time, which has important implications for those implementing rehabilitation programs.

Effects of Different Heating Modalities on Hip Flexion Passive Range of Motion

2012 ◽  
Vol 17 (6) ◽  
pp. 27-30 ◽  
Author(s):  
Matthew Hanson ◽  
James Day
Keyword(s):  
Range Of Motion ◽  
Repeated Measures ◽  
Outcome Measure ◽  
Main Outcome Measure ◽  
Therapeutic Modalities ◽  
Tissue Heating ◽  
Repeated Measures Analysis ◽  
Significant Difference ◽  
Hip Flexion ◽  
Hot Pack

Context:Therapeutic modalities are routinely administered to increase fexibility, but the relative effects of different modes of tissue heating on passive range of motion (PROM) are unknown.Objective:To assess the relative effects of active exercise on a stationary bicycle, moist hot pack treatment, and warm whirlpool treatment on hip fexion PROM.Design:Repeated measures.Subjects:24 males and 20 females between the ages 18 and 24 years.Main Outcome MeasureHip fexion PROM measured by an inclinometer.Results:Repeated measures analysis of variance identified a significant difference among the heating methods, F(1, 43) = 32.41;p< .001. Active exercise produced the greatest change in hip fexion PROM.Conclusions:All three treatment methods produced an increase in hip fexion PROM, but active exercise produced a significantly greater increase than moist hot pack and warm whirlpool treatments.

scholarly journals Thoracic posture, shoulder muscle activation patterns and isokinetic strength of semi-professional rugby union players

2013 ◽  
Vol 25 (1) ◽  
pp. 12 ◽  
Author(s):  
G Bolton ◽  
SJ Moss ◽  
M Sparks ◽  
PC Venter
Keyword(s):  
Rotator Cuff ◽  
Muscle Strength ◽  
Muscle Activation ◽  
Rugby Union ◽  
Lateral View ◽  
Isokinetic Strength ◽  
Serratus Anterior ◽  
Activation Patterns ◽  
Muscle Activation Patterns ◽  
Lower Trapezius

Background. Shoulder injuries are the most severe injuries in rugby union players, accounting for almost 20% of injuries related to the sport and resulting in lost playing hours.Objective. To profile the thoracic posture, scapular muscle activation patterns and rotator cuff muscle isokinetic strength of semi-professionalrugby union players.Methods. Using the hand-behind-the-neck and -back methods, we manually tested the range of motion (ROM) of the shoulder joints of 91 uninjured semi-professional rugby union players who consented to participate in the study. Profiling and classification of thoracic posture was performed according to the New York Posture Test. Activation patterns of the upper and lower trapezius, serratus anterior and infraspinatus scapular muscles were determined by electromyography. The isokinetic muscle strength of the rotator cuff muscles was determined at 60°/sec by measuring the concentric and eccentric forces during internal rotation (IR) and external rotation (ER).Results. Participants presented with non-ideal or unsatisfactory internal (59%) and external (85%) rotators of the shoulder. A slightly abnormal or abnormal forward head posture was observed in 55% of participants, while 68% had an abnormal shoulder position in the lateral view. The muscle activation sequence of the rotator cuff muscles was: (i) serratus anterior, (ii) lower trapezius, (iii) infraspinatus, and (iv) upper trapezius. The isokinetic ER/IR muscle-strength ratio during concentric muscle contraction was 64% (standard deviation (SD) ±14) for the left shoulder and 54% (SD ±10) for the right shoulder. The ER/IR ratio for eccentric muscle contraction was 67% (SD ±12) and 61% (SD ±9) for the left and right shoulders, respectively.Conclusions. Non-ideal or unsatisfactory flexibility of the external rotators of the shoulder, a forward shoulder posture in the lateral view, and weakness of the external rotators did not result in an abnormal rotator cuff muscle activation pattern in this study. Postural deviations may, however, increase the risk of shoulder injury in rugby union players in the long term, and should be corrected.

scholarly journals Volitional Preemptive Abdominal Contraction and Upper Extremity Muscle Latencies During D1 Flexion and Scaption Shoulder Exercises

2018 ◽  
Vol 53 (12) ◽  
pp. 1181-1189 ◽  
Author(s):  
Ramonica Scott ◽  
Hyung Suk Yang ◽  
C. Roger James ◽  
Steven F. Sawyer ◽  
Phillip S. Sizer
Keyword(s):  
Serratus Anterior ◽  
Movement Initiation ◽  
Open Chain ◽  
Cross Sectional ◽  
Upper Trapezius ◽  
Shoulder Muscle ◽  
Onset Timing ◽  
Asymptomatic Volunteers ◽  
Anterior Deltoid ◽  
Lower Trapezius

Context The abdominal-bracing maneuver, a volitional preemptive abdominal contraction (VPAC) strategy, is commonly used during resisted shoulder exercises. How VPAC affects shoulder-muscle function during resisted shoulder exercise is unknown. Objective To identify the effects of VPAC on selected parascapular and glenohumeral muscles during specific shoulder exercises with or without resistance. Design Cross-sectional study. Setting Clinical biomechanics research laboratory. Patients or Other Participants Twenty-two asymptomatic volunteers between 18 and 40 years of age. Intervention(s) Participants performed arm elevation in scaption and D1 shoulder-flexion (D1F) patterns with and without resistance and VPAC. Main Outcome Measure(s) Electromyography was used to test the muscle-contraction amplitudes and onset timing of the anterior deltoid, posterior deltoid, upper trapezius, lower trapezius, and serratus anterior. Muscle-response amplitudes were quantified using root mean square electromyography. Shoulder-muscle relative-onset timing was quantified in reference to kinematic elbow-movement initiation. Results The VPAC increased serratus anterior amplitude during D1F (P &lt; .001) and scaption (P &lt; .001) and upper trapezius amplitude (P &lt; .001) in scaption. All muscle amplitudes increased with resistance. The VPAC decreased muscle-onset latencies for the anterior deltoid (P &lt; .001), posterior deltoid (P = .008), upper trapezius (P = .001), lower trapezius (P = .006), and serratus anterior (P = .001) during D1F. In addition, the VPAC decreased muscle-onset latencies for the anterior deltoid (P &lt; .001), posterior deltoid (P = .007), upper trapezius (P &lt; .001), lower trapezius (P &lt; .001), and serratus anterior (P &lt; .001) during scaption. Conclusions The VPAC affected only the parascapular muscles that had the greatest scapular-stabilizing roles during the specific open chain movement we tested. It decreased latencies in all muscles. These neuromuscular changes may enhance the stability of the shoulder during D1F and scaption exercises.

Hip- and Thigh-Muscle Activation During the Star Excursion Balance Test

2011 ◽  
Vol 20 (4) ◽  
pp. 428-441 ◽  
Author(s):  
Beth Norris ◽  
Elaine Trudelle-Jackson
Keyword(s):  
Outcome Measures ◽  
Repeated Measures ◽  
Muscle Activation ◽  
Neuromuscular Control ◽  
Repeated Measure ◽  
Thigh Muscle ◽  
Balance Test ◽  
Retest Reliability ◽  
Star Excursion Balance Test ◽  
Test Retest Reliability

Context:The Star Excursion Balance Test (SEBT) is often used to train and assess dynamic balance and neuromuscular control. Few studies have examined hip- and thigh-muscle activation during the SEBT.Objective:To quantify hip- and thigh-muscle activity during the SEBT.Design:Repeated measures.Setting:Laboratory.Participants:22 healthy individuals, 11 men and 11 women.Methods:EMG measurements were taken as participants completed 3 trials of the anterior (A), medial (M), and posteromedial (PM) reach directions of the SEBT.Main Outcome Measures:Mean EMG data (% maximal voluntary isometric contraction) from the gluteus medius (Gmed), gluteus maximus (Gmax), and vastus medialis (VM) were measured during the eccentric phase of each SEBT reach direction. Test–retest reliability of EMG data across the 3 trials in each direction was calculated. EMG data from each muscle were compared across the 3 reach directions.Results:Test–retest reliability ranged from ICC3,1 values of .91 to .99. A 2-way repeated-measure ANOVA revealed a significant interaction between muscle activation and reach direction. One-way ANOVAs showed no difference in GMed activity between the A and M directions. GMed activity in the A and M directions was greater than in the PM direction. There was no difference in GMax and VM activity across the 3 directions.Conclusion:GMed was recruited most effectively when reaching was performed in the A and M directions. The A, M, and PM directions elicited similar patterns of muscle recruitment for the GMax and VM. During all 3 SEBT directions, VM activation exceeded the 40–60% threshold suggested for strengthening effects. GMed activity also exceeded the threshold in the M direction. GMax activation, however, was below the 40% threshold for all 3 reach directions, suggesting that performing dynamic lower extremity reaching in the A, M, and PM directions may not elicit strengthening effects for the GMax.

The Effects of Rigid Scapular Taping on Acromiohumeral Distance in Healthy Shoulders: An Observational Study

2017 ◽  
Vol 26 (1) ◽  
pp. 51-56 ◽  
Author(s):  
Alya H. Bdaiwi ◽  
Tanya Anne Mackenzie ◽  
Lee Herrington ◽  
Ian Horlsey ◽  
Ann Cools
Keyword(s):  
Repeated Measures ◽  
Human Performance ◽  
Outcome Measure ◽  
Impingement Syndrome ◽  
Subacromial Impingement Syndrome ◽  
Ultrasound Measurement ◽  
Subacromial Impingement ◽  
Main Outcome Measure ◽  
Repeated Measures Design ◽  
Acromiohumeral Distance

Context:Compromise to the acromiohumeral distance (AHD) has been reported in subjects with subacromial impingement syndrome when compared with healthy subjects. In clinical practice, patients are taped with the intention of altering scapular position and influencing the AHD. However, research to determine the effects of taping on AHD is exiguous.Objectives:To evaluate the effect of ridged taping techniques to increase posterior scapular tilt and upward scapular rotation on the AHD.Design:1-group pretest/posttest repeated-measures design.Setting:Human performance laboratory.Participants:20 asymptomatic participants (10 male and 10 female) age 27 y (SD 8.0 y).Intervention:Ridged tapping of the scapula into posterior tilt and upward scapular rotation.Main Outcome Measure:Ultrasound measurement of the AHD.Results:AHD increased significantly after rigid tape application to the scapula (P < .003) in healthy shoulders in 60° of passive arm abduction.Conclusion:Taping techniques applied to the scapula had an immediate effect of increasing the AHD in healthy shoulders in 60° of passive arm abduction. Results suggest that taping for increasing posterior scapular tilt and increasing scapular upward rotation can influence the AHD and is a useful adjunct to rehabilitation in patients with subacromial impingement syndrome.

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.

Sleep Efficiency and Overreaching in Swimmers

2003 ◽  
Vol 12 (1) ◽  
pp. 1-12 ◽  
Author(s):  
Sean P. Wall ◽  
Carl G. Mattacola ◽  
C. Buz Swanik ◽  
Susan Levenstein
Keyword(s):  
High School ◽  
Repeated Measures ◽  
Outcome Measure ◽  
Sleep Efficiency ◽  
Main Outcome Measure ◽  
Type Design ◽  
Significant Difference ◽  
The Difference

Context:Overreaching can be beneficial, but there is a risk of overtraining.Objective:To investigate the difference in sleep efficiency between overreached and nonover-reached swimmers.Design:Repeated-measures, between-subjects. Swimmers were determined to be overreaching if 2 or more of their consecutive weekly swim times increased by 5% or more from baseline.Participants:9 competitive high school and university sprinter swimmers.Intervention:24-h wrist actigraph.Main Outcome Measure:Sleep efficiency as measured by the actigraph.Results:There was a significant difference in sleep efficiency on night 1 between the overreached and nonoverreached swimmers (P = .008), as well as in their times after averaging over all 5 trials and adjusting for baseline (P = .016). By the fourth swim trial, the overreached swimmers had significantly slower swim times than those of the nonoverreached swimmers (P = .001).Conclusions:Sleep efficiency shows potential as an objective, noninvasive predictor and monitor of overreaching in swimmers.

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