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Squatting exercises in older adults: kinematic and kinetic comparisons.
| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Wang, Man-Ying Greendale, Gail A. Flanagan, Sean Salem, George J. Sanker, Serena E. |
| Description | Country affiliation: United States Author Affiliation: Flanagan S ( Musculoskeletal Biomechanics Research Laboratory, Department of Biokinesiology and Physical Therapy, University of Southern California, Los Angeles, CA 90089, USA.) |
| Abstract | PURPOSES: Squatting activities may be used, within exercise programs, to preserve physical function in older adults. This study characterized the lower-extremity peak joint angles, peak moments, powers, work, impulse, and muscle recruitment patterns (electromyographic; EMG) associated with two types of squatting activities in elders. METHODS: Twenty-two healthy, older adults (ages 70-85) performed three trials each of: 1) a squat to a self-selected depth (normal squat; SQ) and 2) a squat onto a chair with a standardized height of 43.8 cm (chair squat; CSQ). Descending and ascending phase joint kinematics and kinetics were obtained using a motion analysis system and inverse dynamics techniques. Results were averaged across the three trials. A 2 x 2 (activity x phase) ANOVA with repeated measures was used to examine the biomechanical differences among the two activities and phases. EMG temporal characteristics were qualitatively examined. RESULTS: CSQ generated greater hip flexion angles, peak moments, power, and work, whereas SQ generated greater knee and ankle flexion angles, peak moments, power, and work. SQ generated a greater knee extensor impulse, a greater plantar flexor impulse and a greater total support impulse. The EMG temporal patterns were consistent with the kinetic data. CONCLUSIONS: The results suggest that, with older adults, CSQ places greater demand on the hip extensors, whereas SQ places greater demand on the knee extensors and ankle plantar flexors. Clinicians may use these discriminate findings to more effectively target specific lower-extremity muscle groups when prescribing exercise for older adults. |
| ISSN | 01959131 |
| e-ISSN | 15300315 |
| Journal | Medicine & Science in Sports & Exercise |
| Issue Number | 4 |
| Volume Number | 35 |
| Language | English |
| Publisher | Lippincott Williams & Wilkins (on behalf of the American College of Sports Medicine) |
| Publisher Date | 2003-04-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Aging Physiology Exercise Therapy Muscle, Skeletal Biomechanical Phenomena Electromyography Hip Knee Joint Posture Range Of Motion, Articular Clinical Trial Research Support, Non-u.s. Gov't Research Support, U.s. Gov't, P.h.s. Discipline Sports Science |
| Content Type | Text |
| Resource Type | Article |
| Subject | Orthopedics and Sports Medicine Physical Therapy, Sports Therapy and Rehabilitation Sports Science |
