38 research outputs found
Quadriceps And Hamstring Co-Activation Ratio Between Sexes During Exercises On Balance Board
No full text60th Annual Meeting of the American-College-of-Sports-Medicine -- MAY 28-JUN 01, 2013 -- Indianapolis, INWOS: 000330469701134…Amer Coll Sports Me
Shoulder and Scapular Muscle Activity During Low and High Plank Variations With Different Body-Weight-Bearing Statuses
No full textABSTRACT: Can, EN, Harput, G, and Turgut, E. Shoulder and scapular muscle activity during low and high plank variations with different body-weight-bearing statuses. J Strength Cond Res 38(2): 245-252, 2024-This study investigated the activation levels and activation ratios of shoulder and scapular muscles during low plank (LP) and high plank (HP) variations, with varying levels of body-mass support, including 4-point, 3-pod, and 2-point body-weight-bearing (BWB) statuses. The study was conducted with 21 healthy men (mean ± SD , 26 ± 6.5 years of age and 24.4 ± 2.4 kg·m -2 BMI). Ten different plank exercises were performed in a mixed order by changing elbow joint positions (LP and HP) and BWB statuses (2-point, 3-pod, and 4-point). Activation levels of the lower trapezius (LT), middle trapezius (MT), upper trapezius (UT), biceps brachii, triceps brachii, infraspinatus, and serratus anterior (SA) muscles were assessed with a surface electromyography device. Results of this study showed that elbow position changes resulted in higher LT ( p = 0.01) and TB ( p = 0.001) activation in HP exercises. In general, it was observed that an increase in BWB status was effective in increasing activation for the scapula and shoulder girdle muscles. The ratios of the UT muscle to the SA, LT, and MT muscles were less than 1 during side plank, bird dog, front reach, shoulder taps, and plank with shoulder external rotation exercises. High plank with toe touch exercise resulted in a marked increase in the UT activation. Therefore, it was concluded plank variations alter activation levels and activation ratios of shoulder and scapular muscles. Plank exercises may be used in shoulder rehabilitation and the progression in plank variations can be achieved by changing elbow position and BWB status based on individual requirements
Weight-Bearing Exercises on Slideboard Increase Quadriceps and Hamstring Activation Levels and Improve Hip- and Knee-Flexion Angles in Physically Active Individuals
No full textCONTEXT: Slideboards are commonly used in exercise programs, but there is limited information about how they affect muscle activities during exercise. We aim to compare the activation levels of quadriceps and hamstring muscles and hip- and knee-flexion angles during lunge and single-leg squat exercises between normal ground and slideboard in physically active individuals. DESIGN: Cross-sectional study. METHODS: Thirty healthy individuals (age: 23.83 [2.84] y, body mass index: 21.75 [1.72] kg/m2) were included in the study. Surface electromyography was used to measure vastus medialis, vastus lateralis, biceps femoris, and semitendinosus activation levels during reaching and returning phases of the forward, lateral, and back lunges and squats that were performed on the normal ground and slideboard. Exercises were performed at a slow pace (60 beats/min). Hip- and knee-flexion angles during the exercises were evaluated by using 2-dimensional motion analysis. Repeated measures of analysis of variance were used for statistical analysis. RESULTS: Vastus medialis and vastus lateralis activation levels were greater during reaching and returning phases of the exercises on slideboard compared with normal ground (P < .05). However, semitendinosus and biceps femoris activity were greater only during the returning phase of the forward lunge (P < .001) and the returning phase of the back squat (P = .002, P = .009, respectively). Hip-to-knee flexion ratios were closer to 1 when the forward lunge (P < .001), back lunge (P = .004), and forward squat (P = .001) exercises were performed on a slideboard. CONCLUSION: In exercise programs that target the quadriceps and hamstring muscles, slideboards can be effectively used in exercise progressions as they can increase muscle activity. Moreover, squat and lunge exercises on slideboard with a slow pace may also be helpful for improving the balance between hip- and knee-flexion angles
Rehabilitation practices of Turkish physiotherapists following anterior cruciate ligament reconstruction: an online survey
No full textWe aimed to investigate the anterior cruciate ligament reconstruction (ACL-R) rehabilitation and return-to-sport (RTS) practices of Turkish physiotherapists. An online survey with 25 questions on ACL-R rehabilitation and RTS practices was created on Google Forms and distributed to physiotherapists via social media. Two-hundred sixty-four physiotherapists' responses were analysed. About 62.3% of therapists treated patients prior to ACL-R. Open-kinetic-chain (OKC) exercises frequently started at 4-6 weeks post-operatively (34.8%). Return-to-running cleared at 3-4 months (37%) and RTS cleared at 6-9 months (40.2%) mostly. Manual muscle tests were used by 58.4% of physiotherapists to evaluate knee strength before RTS. About 46.7% of physiotherapists did not assess psychological readiness for RTS. Physiotherapists with a bachelor's degree cleared patients for RTS earlier (<9 months) than those with postgraduate degrees (p = 0.001) but used patient-reported outcome measures (PROMs) more frequently (p = 0.010). Physiotherapists with over 5 years of experience used PROMs and psychological readiness scales more frequently (p = 0.035, p = 0.001) but also cleared patients for RTS earlier (p = 0.014). This study revealed that physiotherapist rehabilitation practices after ACL-R are not fully consistent with the current best evidence. This inconsistency in rehabilitation practices may lead to suboptimal patient outcomes after ACL-R. Encouraging physiotherapists to incorporate the latest evidence into practice might lead to better rehabilitation outcomes
Trapezius muscle activity during scapular retraction exercises: A comparative study between patients with subacromial impingement syndrome and healthy controls
No full textComparison Of Quadriceps Thickness And Strength, And Knee Function Between Individuals With Acl Reconstruction And Healthy Individuals
No full textQuadriceps Muscle Strength Recovers Faster Than Hamstring Strength After Acl Reconstruction With Hamstring Tendon Autograft
No full textRelationship Between Middle Trapezius Muscle Activation and Acromiohumeral Distance Change During Shoulder Elevation With Scapular Retraction
No full textContext: The scapular retraction exercises are widely used among clinicians to balance the activity of the scapular muscles as well as the rotator cuff muscles in different shoulder abduction positions. Objectives: The aim of this study was to investigate the relationship between scapular (middle and upper trapezius) and shoulder muscles (middle deltoid and infraspinatus) activation level differences and acromiohumeral distance changes during shoulder abduction with scapular retraction. Design: Cross-sectional study. Setting: University research laboratory. Participants: Nineteen asymptomatic individuals were included (mean [SD]: age = 22.4 [1.8] y). Main Outcome Measure: The acromiohumeral distance was measured at 0° and 90° shoulder abduction when the scapula was in nonretracted and retracted position with ultrasound imaging. The relationship between muscle activation level changes and acromiohumeral distance difference was analyzed with the Pearson correlation test. Results: Middle trapezius muscle activity change correlated with acromiohumeral distance difference (r = .55, P = .02) from 0° to 90° shoulder abduction when scapula was retracted. For both nonretracted and retracted scapular positions, no correlations were found between middle deltoid, infraspinatus, and upper trapezius muscle activity changes with acromiohumeral distance differences during shoulder abduction (P > .05). Conclusions: Active scapular retraction exercise, especially focusing on the middle trapezius muscle activation, seems to be an effective treatment option to optimize the acromiohumeral distance during shoulder abduction.</jats:p
Which One Enhances Muscular Performance In Acl Reconstructed Subjects: Brace Or Tape?
No full textPubMe
Isokinetic Strength Profile Of Shoulder Internal And External Rotators Of Adolescent Volleyball Players
No full textObjectives: The aim of this study was to investigate the effects of limb dominance and gender on isometric, eccentric and concentric strength of the shoulder internal and external rotator muscles in adolescent volleyball players. Methods: Forty adolescent volleyball players [Male: 23( Age: 15.5±1.4 yrs, Body weight: 72±10.2 kg, Height: 184.4±7.6 cm, BMI: 20.9±2.6 kg/m2), Female: ( Age: 16.7±0.9 yrs, Body weight: 60.7±8.2 kg, Height: 172.5±5.3 cm, BMI: 20.4±2.3 kg/m2) participated in this study. Isomed 2000 isokinetic dynamometer was used to measure muscle strength testing. Isometric strength testing of shoulder internal and external rotator muscles were performed at 90 ° shoulder abduction and external rotation position. In the same position, concentric and eccentric muscle testing was performed at 90°/s angular velocity. Strength outcomes were recorded as Nm/kg. 2-way repeated measures of ANOVA was used for statistical analysis. Results: Dominance by gender interaction was not found significant for internal rotator (IR) and external rotator (ER) muscles' strength (IR: F(1,72)=2.87, p=0.06, ER: F(1,72)=1.98, p=0.15). There was a significant strength by dominance interaction for internal rotator muscles (F(2,72)=18.52, p<0.001). Isometric strength was greater in dominant limb (p<0.001)while concentric strength was found greater in non-dominant limb(p=0.006). Eccentric strength was found similar for limbs (p=0.18). IR muscles showed greater strength during eccentric (1.03±0.05), concentric (0.76±0.03) and isometric test (0.69±0.03), respectively. On the other hand, external rotators showed greater strength during eccentric (0.49±0.4), isometric (0.40±0.3) and concentric test (0.36±0.3), respectively. There was no significant gender effect on the strength (IR: F(2,72)=0.31, p=0.73, ER: F(2,72)=0.42, p=0.66). Conclusion: The strength of shoulder internal and external rotator muscles do not differ according to gender in adolescent volleyball players. Limb dominance has an effect on the strength of internal rotator muscles while it has no effect on the strength of external rotators. Both muscle groups show greater strength during eccentric testing.PubMe
