TY - JOUR ID - 16844 TI - Effect of seated leg press exercise on knee extension strength in elderly JO - Journal of Research in Rehabilitation Sciences JA - JRRS LA - en SN - 1735-7519 AU - Khoga Naamat, Karar AU - Sadeghi, Heydar AU - Sahebozamani, Mansour AU - Nazari, Somaye AD - PhD candidate for sport biomechanics & Kharazmi University, Tehran, Iran AD - Professor, Department of Physical Education & Sport Sciences, Kharazmi University, Tehran, Iran AD - Associate Professor, Department of Physical Education & Sport Science, Shahid Bahonar University, Kerman, Iran AD - Department of Physical Education & Sport Science, Shahid Beheshti, Tehran, Iran Y1 - 2014 PY - 2014 VL - 10 IS - 4 SP - 539 EP - 548 DO - 10.22122/jrrs.v10i4.1370 N2 - Abstract Introduction: After age 50 to 70 years, 15% of muscles strength is lost per decade. Elderly people need to 90% of knee extensor muscles strength for daily activities such as getting up from a chair, while this value is only slightly more than half in young people. Due to the importance of knee extensor muscles strength in elderly, the purpose of this study was effect of seated leg press exercise on knee extension strength in elderly.Materials and Methods: twenty-four elderly men (age 61.41±6 years, height 75.9±6.2 kg and weight 173.31±5.2) were randomly divided in two matched groups. Resistance training group performed one set of 12 repetitions with 70% of one repetition maximum (1RM) in each session, twice a week for eight weeks. Control group were engaged in their daily activities in this period. Isokinetic strength of the knee extensors of both legs was determined at 60°/s with a dynamometer (Biodex system 3).Results: The 8-week seated leg press exercise led to significant improvements in knee extension strength from pretest to posttest for both dominant and non-dominant leg in resistance training group  (respectively P=0.002 and P=0.003). These changes were not significant in control group (respectively P=0.220 and P=0.168).Conclusions: performing one set of 12 repetitions with 70% of 1RM in each session, twice a week for eight weeks, may led to significant improvement in knee extension strength in elderly people.Key words: Seated leg press, Knee extension strength, Elderly  UR - https://jrrs.mui.ac.ir/article_16844.html L1 - https://jrrs.mui.ac.ir/article_16844_1684cca8f01b69d9ec921ee5b2681613.pdf ER -