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Muscle activity and inactivity periods during normal daily life

Tikkanen, Olli, Haakana, Piia, Pesola, Arto J., Häkkinen, Keijo, Rantalainen, Timo, Havu, Marko, Pullinen, Teemu and Finni, Taija 2013, Muscle activity and inactivity periods during normal daily life, PLoS ONE, vol. 8, no. 1, pp. 1-9, doi: 10.1371/journal.pone.0052228.

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Title Muscle activity and inactivity periods during normal daily life
Author(s) Tikkanen, Olli
Haakana, Piia
Pesola, Arto J.
Häkkinen, Keijo
Rantalainen, TimoORCID iD for Rantalainen, Timo orcid.org/0000-0001-6977-4782
Havu, Marko
Pullinen, Teemu
Finni, Taija
Journal name PLoS ONE
Volume number 8
Issue number 1
Start page 1
End page 9
Total pages 9
Publisher Public Library of Science
Place of publication San Francisco, Calif.
Publication date 2013
ISSN 1932-6203
Keyword(s) Muscle activity
Inactivity periods
Summary 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<0.05). In conclusion, during normal daily life the locomotor muscles are inactive about 7.5 hours, and only a small fraction of muscle's maximal voluntary activation capacity is used averaging only 4% of the maximal recruitment of the thigh muscles. Some daily non-exercise activities such as stair climbing produce much higher muscle activity levels than brisk walking, and replacing sitting by standing can considerably increase cumulative daily muscle activity.
Language eng
DOI 10.1371/journal.pone.0052228
Field of Research 119999 Medical and Health Sciences not elsewhere classified
Socio Economic Objective 970111 Expanding Knowledge in the Medical and Health Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2013, Public Library of Science (PLoS)
Free to Read? Yes
Use Rights Creative Commons Attribution licence
Persistent URL http://hdl.handle.net/10536/DRO/DU:30061367

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Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.