Muscle Activity and Inactivity Periods during Normal Daily Life
| Autor: | Marko Havu, Arto J. Pesola, Piia Haakana, Timo Rantalainen, Keijo Häkkinen, Taija Finni, Teemu Pullinen, Olli Tikkanen |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
Male
Activities of daily living Anatomy and Physiology Time Factors Osteopenia and Osteoporosis Isometric exercise Electromyography Cardiovascular System Quadriceps Muscle textile electrodes 0302 clinical medicine Activities of Daily Living Biomechanics 030212 general & internal medicine Muscle activity ta315 Musculoskeletal System inactive lihasten aktiivisuus Multidisciplinary medicine.diagnostic_test Stair climbing Middle Aged Occupational and Industrial Health musculoskeletal system elektromyografia Muscle Medicine Female Public Health fyysinen aktiivisuus Research Article inaktiivisuus Adult medicine.medical_specialty Science Physical activity Sitting Neurological System 03 medical and health sciences Young Adult Physical medicine and rehabilitation sedentary medicine Humans Sports and Exercise Medicine Muscle Skeletal Aged Motor Systems business.industry physically active 030229 sport sciences body regions Women's Health Exertion Preventive Medicine business human activities Hamstring |
| Zdroj: | PLoS ONE, Vol 8, Iss 1, p e52228 (2013) PLoS ONE |
| Popis: | Recent findings suggest that not only the lack of physical activity, but also prolonged times of sedentary behaviour where major locomotor muscles are inactive, significantly increase the risk of chronic diseases. The purpose of this study was to provide details of quadriceps and hamstring muscle inactivity and activity during normal daily life of ordinary people. Eighty-four volunteers (44 females, 40 males, 44.1±17.3 years, 172.3±6.1 cm, 70.1±10.2 kg) were measured during normal daily life using shorts measuring muscle electromyographic (EMG) activity (recording time 11.3±2.0 hours). EMG was normalized to isometric MVC (EMGMVC) during knee flexion and extension, and inactivity threshold of each muscle group was defined as 90% of EMG activity during standing (2.5±1.7% of EMGMVC). During normal daily life the average EMG amplitude was 4.0±2.6% and average activity burst amplitude was 5.8±3.4% of EMGMVC (mean duration of 1.4±1.4 s) which is below the EMG level required for walking (5 km/h corresponding to EMG level of about 10% of EMGMVC). Using the proposed individual inactivity threshold, thigh muscles were inactive 67.5±11.9% of the total recording time and the longest inactivity periods lasted for 13.9±7.3 min (2.5–38.3 min). Women had more activity bursts and spent more time at intensities above 40% EMGMVC than men (p |
| Databáze: | OpenAIRE |
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