• 제목/요약/키워드: Single leg squat

검색결과 12건 처리시간 0.018초

내림 경사대에서 한 다리 스쿼트 운동 시 경사면과 자세변화에 따른 무릎주변근의 근활성도 (Activation of Knee Muscles on Various Decline Boards and Postures During Single Leg Decline Squat Exercise)

  • 유원규;이충휘;권오윤;전혜선
    • 한국전문물리치료학회지
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    • 제12권3호
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    • pp.22-30
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    • 2005
  • This study was designed to identify the effect of various decline boards and postures of lower extremities on surface electromyographic (EMG) activity of knee muscles during isometric single-leg decline squat exercises. The subjects were twenty young male adults who had not experienced any knee injury and their Q-angles were within a normal range. They were asked to perform single-leg decline squat exercises in five various conditions. The EMG activities of the gluteus maximus (GM), vastus lateralis (VL), vastus medialis (VMO), tibialis anterior (TA), and gastrocnemius (GCM) muscles were recorded in five various single-leg decline squat exercises by surface electrodes and normalized by maximal voluntary isometric contraction (MVIC) values. The normalized EMG activity levels were compared using one-way ANOVA with repeated measures. The results of this study were as follows: 1) Exercises 2 and 4 produced significantly greater EMG activity of VMO than did exercise 1 ($p_{adj}$<.05/10), 2) The VMO/VL ratio of EMG activity of exercise 4 was the highest, producing a significantly greater ratio than exercise 1 ($p_{adj}$<.05/10). These results show that single-leg lateral oblique decline squat exercise is the best exercise for selective strengthening of VMO, and the posture of the contralateral leg does also affect strengthening of VMO, but we'll need to research patellofemoral joint compression for clinical application of single-leg lateral oblique decline squat exercises.

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한다리 스쿼트 시 중간볼기근의 생체되먹임 훈련이 동적 균형에 미치는 즉각적인 효과 (Immediate Effect of Biofeedback Training of Gluteus Medius on Dynamic Balance during Single Leg Squat)

  • 양경혜;정종철;박두진
    • PNF and Movement
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    • 제21권2호
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    • pp.255-263
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    • 2023
  • Purpose: This study aims to investigate the immediate effects of electromyography (EMG) biofeedback training of the gluteus medius on dynamic balance during single leg squats in healthy individuals. Methods: The sample size in this study was estimated using the G-power program at an effect size of 0.4, a significance level (α) of 0.05, and a testing power of 0.90. In addition, as a result of considering the 10% dropout rate, this study recruited 21 healthy individuals (8 males and 13 females). All subjects measured the Y-balance test-lower quarter (YBT-LQ) and limits of stability (LOS) before and after a single leg squat (SLS) and SLS with EMG biofeedback training of the gluteus medius (SLSEB). They were trained for 10 minutes for each exercise, and two dynamic balance tests were performed three times. Results: There was a significant difference in the YBT-LQ score between the two exercises (p < 0.05). In the YBT-LQ score, there was a significant difference before and after SLS and SLSEB (p < 0.05). SLSEB showed a significantly higher YBT-LQ score than SLS (p < 0.05). There was a significant difference in LOM between the two exercises (p < 0.05). However, there was no significant difference between the two exercises. Conclusion: A single-leg squat with EMG biofeedback exercises is an effective method to improve dynamic balance, such as the YBT-LQ.

Correlation of single leg vertical jump, single leg hop, and single leg squat distances in healthy persons

  • Shin, Seung-Ho;Woo, Hyunjae
    • Physical Therapy Rehabilitation Science
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    • 제2권1호
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    • pp.57-61
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    • 2013
  • Objective: To determine the correlation among three functional tests: single leg vertical jump (SLVJ), single leg hop for distance (SLHD), and single leg squat (SLSQ). Design: Cross sectional study. Methods: Twenty healthy men (n=10) and women (n=10) with no history of lower extremity dysfucntion participated in this study and performed in university research laboratory. The procedures consisted of a general warm-up, a task-specific warm-up, actual testing, and a cool down. All participants performed the three tests in random order. Each test was performed three times for the dominant and non-dominant lower extremity (LE). SLVJ, SLHD, SLSQ were measured using a standard tape measure. Results: Statistically significant difference was presented between dominant LE and non-dominant LE in each function test (p<0.05). The strongest correlation was between SLVJ and SLSQ, 0.939 and 0.883 for dominant and non-dominant LE, respectively (p<0.05). The weakest correlation was between SLVJ and SLHD, 0.713 for dominant (p<0.05) and between SLSQ and SLHD, 0.739 for non-dominant (p<0.05). Conclusions: There is a strong correlation between SLVJ and SLSQ, suggesting that each test measures similar constructs of function and can be substitutive, while weak correlation between SLSQ and SLHD suggest these two tests do not measure the same functional components and could be paired as outcome measures for the clinical assessment of LE function. It will provide physical therapist with scientific evidence for effective test combination of LE function assessment in clinical practice.

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Comparison of difference in muscle activity ratio, ground reaction force and knee valgus angle during single leg squat and landing according to dynamic taping

  • Ha, Tae-Won;Park, Sam-Ho;Lee, Myung-Mo
    • Physical Therapy Rehabilitation Science
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    • 제9권4호
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    • pp.281-286
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    • 2020
  • Objective: This study examined the effects of dynamic tape applied to the patellofemoral joint on the knee valgus angle, muscle activity, and ground reaction force during a single leg squat (SLS) and single leg landing (SLL). Design: Cross-sectional study. Methods: Twenty-four subjects (11 male, 13 female) who met the inclusion criteria were screened by the knee palpation and patella compression tests. First, the knee valgus angle and muscle activity during SLS were measured. Second, the knee valgus angle and ground reaction force during SLL were measured. For the intervention, a patella joint loop using dynamic tape was used. The knee valgus angle, muscle activities in SLS and SLL after the intervention, and the ground reaction force were measured in the same way. A paired t-test was used to examine the difference between before and after the intervention. Results: The knee valgus angle showed a statistically significant improvement after dynamic taping application in SLS and SLL (p<0.05). The differences in muscle activity of the VL/VMO and ground reaction forces were not statistically significant after dynamic taping application in SLS and SLL. Conclusions: This study showed that dynamic taping applied around the patellofemoral joint was effective in improving the knee valgus angle in SLS and SLL and had a reduced risk of secondary injury during sports activity.

통제된 한다리 스쿼트 동작시 슬개대퇴동통증후군 환자의 중간볼기근과 넙다리네갈래근에서 나타나는 근활성도와 근력 및 무릎 외반각도의 남녀 비교 (Gender Comparison of Muscle Activity and Strength in Gluteus Medius and Quadriceps and Knee Valgus Angle During Controlled Single-Leg Squat in Individuals With Patellar Femoral Pain Syndrome)

  • 윤태림;김기송
    • 한국전문물리치료학회지
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    • 제23권1호
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    • pp.11-19
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    • 2016
  • Background: Investigation in gender differences of kinetics and kinematics for individuals with patellar femoral pain syndrome (PFPS) was not sufficiently performed. Objects: The purpose of this study is that whether there is a difference depending on gender from muscle activity and strength and knee valgus angle during controlled single-leg squat which is widely used as clinical movement test for the patient with PFPS. Methods: 20 young adults (10 men, $20.0\pm}2.1$years; 10 women, $20.4{\pm}2.1$years) with PFPS were voluntarily recruited in this study. Muscle activity and strength and knee valgus angle were collected during single-leg squat. Independent t-test and Mann-Whitney test were used to compare the differences between groups of male and female. Results: Rectus femoris (t=-2.204, p=.041) and vastus medialis oblique (t=-2.151, p=.045) muscle activity of women were significantly higher than male group. Normalized muscle strength of hip and knee muscles showed a significant difference between men and women (p<.05). Valgus angle of the knee in women (t=-2.450, p=.025) were increased significantly than men. Conclusion: The therapist would consider the characteristics of these gender differences during performing movement test, exercise, and education for the individuals with PFPS.

기능적 족관절 불안정성을 평가할 수 있는 새로운 균형 평가법: 체질량 지수와 성별과의 연관성 (Novel Balance Tests for Assessing Functional Ankle Instability: Relationships with BMI and Gender)

  • ;여의동;김승주;임홍철;황명회;박세현;김학준
    • 대한족부족관절학회지
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    • 제16권2호
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    • pp.128-134
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    • 2012
  • Purpose: To design novel balance tests to assess FAI and evaluate whether these tests are affected by BMI or gender, with the goal of developing reliable FAI assessment tests that are not influenced by these factors. Materials and Methods: Participants included 20 young, healthy volunteers, 12 males and 8 females, with a mean age of $24{\pm}4$ years and a mean BMI of $23{\pm}2.28$. None of the subjects had known ankle instability. The following tests were assessed in each participant: single leg balance (SLB), percentage of leg press (PLP), single leg cycling (SLC), one leg squat (OLS), multiple direction reach-front/back/side (MDR-F/B/S), single leg hop (SLH), two leg jump (TLJ) and side step (SS). Data were analyzed using the SPSS 12.0 software program with ANOVA and t-test used. Results: When grouped by BMI, we found that despite differences in BMI, the performances of all subjects were equivalent except for the one-leg-squat test, for which the mean ratios for underweight ($1.69{\pm}0$), normal weight ($1.05{\pm}0.19$), and overweight ($0.93{\pm}0.30$) individuals were significantly different (p=0.02); ratios for SLB (p=0.273), SLC (p=0.903), PLP (p=0.664), MDR-F/B/S (p=0.498, 0.908, and 0.503, respectively), SLH (p=0.332) were not significantly different. When calculated according to gender, we found that the OLS (p=0.013) and MDRS (p=0.034) were significantly different, while parameters for all the remaining tests were not affected. Conclusion: We found that the SLB, PLP, SLC, MDR-F/B, and SLH ratios were unaffected by BMI or sex and, therefore, are reliable parameters for assessing ankle instability.

치료적 운동이 허리통증을 가진 여자 청소년 골프선수의 통증, 근기능 및 방사선학적 평가에 미치는 영향: 증례보고 (The Effect of Exercise Therapy on Pain, Muscle Function and Radiological Evaluation in a Female Youth Golf Player with Low Back Pain: Case Report)

  • 이호성
    • 대한물리의학회지
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    • 제13권3호
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    • pp.1-9
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    • 2018
  • PURPOSE: The purpose of this study was to determine the effect of exercise therapy on low back pain (LBP), the function of paraspinal and abdominis muscles, and the sacrohorizontal angle as seen on the radiographs of the lumbar spine in a young female golf player with LBP. METHODS: This case report describes an 11-year-old female golfer who presented with LBP. The exercise therapy program comprised lumbar joint mobilization, lumbar spine flexion distraction, abdominal bridge, plank, side plank, and single-leg extensions from a 4-point kneeling position for 40 min/day; this was done twice a week for 8-weeks. LBP [visual analog scale (VAS) and Oswestry disability index (ODI)] and function of paraspinal and abdominis muscles [Ito test, curl-up test, $90^{\circ}$ stop test, squat test, opened eye one leg stance test (OEOL), and closed eye one leg stance test (CEOL)] were measured before and after 4 and 8 weeks of exercise therapy. The radiographs were analyzed for the lumbar Cobb's angle and sacrohorizontal angle before and after 8 weeks of exercise therapy. RESULTS: After 4 and/or 8 weeks of exercise therapy, VAS and ODI scores decreased; results for the Ito test, curl-up test, $90^{\circ}$ stop test, squat test, and OEOL and CEOL of muscle function improved; and the lumbar Cobb's angle and sacrohorizontal angle improved. CONCLUSION: These results suggest that exercise therapy improves LBP, muscle function, and radiographic parameters associated with LBP in young golf players. These findings have clinical implications for exercise therapy in young female golf players who have LBP.

Comparison of Foot Pressure Distribution During Single-leg Squat in Individuals With and Without Pronated Foot

  • Il-kyu Ahn;Gyeong-tae Gwak;Ui-jae Hwang;Hwa-ik Yoo;Oh-yun Kwon
    • 한국전문물리치료학회지
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    • 제31권1호
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    • pp.40-47
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    • 2024
  • Background: Single-leg squat (SLS)s are commonly used as assessment tool and closed kinetic exercises are useful for assessing performance of the lower extremities. Pronated feet are associated with foot pressure distribution (FPD) during daily activities. Objects: To compare the FPD during SLSs between groups with pronated and normal feet. Methods: This cross-sectional study included 30 participants (15 each in the pronated foot and control groups) are recruited in this study. The foot posture index was used to distinguish between the pronated foot and control groups. The Zebris FDM (Zebris Medical GmbH) stance analysis system was used to measure the FPD on the dominant side during a SLS, which was divided into three phases. A two-way mixed-model ANOVA was used to identify significant differences in FPD between and within the two groups. Results: In the hallux, the results of the two-way mixed-model ANOVAs revealed a significant difference between the group and across different phases (p < 0.05). The hallux, and central forefoot were significantly different between the group (p < 0.05). Moreover, significant differences across different phases were observed in the hallux, medial forefoot, central forefoot, lateral forefoot, and rearfoot (p < 0.05). The post hoc t-tests were conducted for the hallux and forefoot central regions. In participants with pronated foot, the mean pressure was significantly greater in hallux and significantly lower, in the central forefoot during the descent and holding phases. Conclusion: SLSs are widely used as screening tests and exercises. These findings suggest that individuals with pronated feet should be cautious to avoid excessive pressure on the hallux during the descent-to-hold phase of a SLS.

2D Single-legged Dynamic Knee Valgus assessments Methods: Evaluating Risk Factor for Internal Derangement of the Knee; Literature Review

  • Hyun Lee;Jihye Jung;Seungwon Lee
    • Physical Therapy Rehabilitation Science
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    • 제13권2호
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    • pp.240-249
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    • 2024
  • Objective: The objective of this study is to evaluate various research that have examined dynamic knee valgus and to pinpoint a straightforward, clinically practical 2D assessment method for dynamic knee valgus that is user-friendly. Design: A literature review Methods: This literature review was conducted in Pubmed, MEDLINE® and Google Scholar with the following key words: Knee valgus angle, Knee valgus evaluation, Knee valgus assessment, Dynamic knee valgus. After removing duplicate studies, 53 articles were initially chosen using this method, with 17 studies ultimately meeting the selection criteria. Results: Based on the comprehensive review of various studies, the Single Leg Squat (SLS) was identified as the most popular test method, followed by the Single Leg Landing (SLL) as the next most common test method. The Frontal Plane Projection Angle (FPPA) method was the most representative method for measuring dynamic knee valgus (DKV) during these tests. SLS was found in a total of 10 studies, while SLL was found in 7 studies. Conclusions: The most commonly proposed test for assessing DKV is measuring the SLS using the FPPA method. However, when applied to individuals without knee pathology, the discriminative power of this method may be limited. This suggests the need for further research to explore alternative methods for assessing DKV in this population.

The Effects of Squat and Corrective Exercises on Body Composition and Body Shape Balance in Older Adults

  • Jung-Yeon Cho
    • 한국컴퓨터정보학회논문지
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    • 제29권9호
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    • pp.159-167
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    • 2024
  • 본 연구는 스쿼트 운동과 교정 운동을 통해 근감소증 예방을 위한 노인의 다양한 운동프로그램 적용 및 개선하고자 총 32명의 개별 근관절검사를 실시 후 스쿼트 운동과 교정운동을 12주간 주 2회 실시하였으며, 다음과 같은 결과를 도출하였다. 운동프로그램 참여 전보다 신체조성은 골격근량, 기초대사량에서 12주 후 유의하게 증가하였고, 정적 자세 균형은 전면 어깨, 골반의 균형 및 편향성, 좌측 다리 내반슬과 측면의 경추와 흉추, 골반 기울기가 12주 후 유의한 자세 균형을 나타냈다. 동적 자세 균형은 복합 불균형 지수, 과도한 상체 숙여짐, 허리 전만 또는 후만, 한쪽 무릎의 기울어짐과 하향 모두 12주 후 매우 유의한 자세 균형을 나타냈다. 본 연구에서 확인한 바와 같이, 맞춤형 노인 운동프로그램에 대한 다양성과 정밀한 분석을 통한 운동처방은 매우 중요하며, 현장에서 실제적 적용을 통해 노인 건강유지 및 증진 연구를 위한 관심과 노력이 필요하다.