THE EFFECT OF 12 WEEKS CIRCUIT-TRAINING ON HEEL CONTACT VELOCITY AND REACTION TIME IN ELDERLY WOMEN

The purpose of this study was to determine the effects of circuit-training on heel contact velocity (HCV) during walking and reaction time (RT) in community-dwelling elderly women. Subjects were 20 healthy independent elderly women who participated in circuittraining which consisted of posture control, strength training and walking training for 12 weeks. Study outcomes included gait test, reaction time test, and 30-s chair stand test. RT and HCV were decreased significantly. The times of the 30-s chair stand test was increased significantly after training. These findings suggest that 12 weeks of circuittraining may attenuate the risks of slips and slip-initiated falls during walking in community-dwelling elderly women

Pengaruh Latihan Beban terhadap Kekuatan Otot Kaki dan Kemampuan Menendang Pemain Sepak Bola

Tujuan penelitian ini adalah untuk mengetahui pengaruh latihan beban pada kekuatan otot kaki dan kemampuan menendang pemain sepak bola. Subjek yang berjumlah sebelas orang dibagi menjadi dua kelompok. Lima pemain kelompok eksperimen melakukan latihan beban tiga kali per minggu selama sepuluh minggu yang dilakukan secara bersamaan dengan latihan sepak bola. Enam pemain kelompok kontrol hanya melakukan latihan sepak bola tanpa latihan beban yang berlatih bersama kelompok yang melakukan latihan beban. Pengaruh latihan beban tidak hanya meningkatkan secara signifikan pada kekuatan otot kaki, tetapi juga meningkatkan kecepatan dari pergelangan kaki dan kecepatan bola. Kelompok kontrol yang hanya melakukan latihan sepak bola, tidak menunjukkan peningkatan yang berarti baik pada kekuatan otot kaki maupun kecepatan bola. Hasil penelitian ini menunjukkan bahwa kekuatan otot kaki merupakan salah satu faktor penting di dalam kemampuan menendang

Association between hip abductor function, rear-foot dynamic alignment, and dynamic knee valgus during single-leg squats and drop landings

AbstractBackgroundPreventing anterior cruciate ligament (ACL) injuries is very important for athletes, and dynamic knee valgus is considered a risk factor for non-contact ACL injury. However, little is known about whether the functions of the hip abductor and rear-foot increase dynamic knee valgus. A two-dimensional (2D) video-based screening test focused on hip abductor and rear-foot functions among factors involved in dynamic knee valgus. The present study determined associations between hip and rear-foot dynamic alignment and dynamic knee valgus.MethodsThis cross-sectional study recruited 130 female basketball players (258 legs) from nine high-school teams. The players performed single-leg squats and single-leg drop landings to provide knee-in (KID) and hip-out (HOD) distances on 2D video images. Hip and rear-foot dynamic alignment was evaluated using a dynamic Trendelenburg test (DTT) and a dynamic heel-floor test (HFT).ResultsThe Chi-square test revealed no significant difference in the prevalence of DTT-positivity between single-leg squats (28.7%) and single-leg drop landings (23.3%). The prevalence of HFT-positivity was significantly greater during landings (51.4%) than during single-leg squats (31.0%, p < 0.01). The KID values for both single-leg squats and single-leg drop landings were greater in the DTT-positive than in the DTT-negative group (15.1 ± 5.4 cm and 20.2 ± 7.5 cm, p < 0.001). The HOD values were similarly greater in the DTT-positive group (15.2 ± 1.9 cm and 17.6 ± 2.8 cm, p < 0.001). The KID values for both single-leg squats and single-leg drop landings were greater in the HFT-positive than in the HFT-negative group (12.2 ± 5.1 cm, p < 0.01; 14.7 ± 7.2 cm, p < 0.001), whereas HOD values for these tasks did not significantly differ between the two groups.ConclusionDynamic hip mal-alignment might be associated with both greater KID and HOD, whereas rear-foot eversion is associated only with greater KID. Hip abductor and rear-foot dysfunction are important factors for dynamic knee valgus and thus evaluating DTT and HFT will help to prevent dynamic knee valgus