Muscle activity and inactivity periods during normal daily life.

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 in...

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Autores principales:	Olli Tikkanen, Piia Haakana, Arto J Pesola, Keijo Häkkinen, Timo Rantalainen, Marko Havu, Teemu Pullinen, Taija Finni
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2013
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/23dbf05648cd42bd8c125906477162c3
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spelling	oai:doaj.org-article:23dbf05648cd42bd8c125906477162c32021-11-18T08:00:56ZMuscle activity and inactivity periods during normal daily life.1932-620310.1371/journal.pone.0052228https://doaj.org/article/23dbf05648cd42bd8c125906477162c32013-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/23349681/?tool=EBIhttps://doaj.org/toc/1932-6203Recent 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 (EMG(MVC)) 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 EMG(MVC)). During normal daily life the average EMG amplitude was 4.0±2.6% and average activity burst amplitude was 5.8±3.4% of EMG(MVC) (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 EMG(MVC)). 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% EMG(MVC) 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.Olli TikkanenPiia HaakanaArto J PesolaKeijo HäkkinenTimo RantalainenMarko HavuTeemu PullinenTaija FinniPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 8, Iss 1, p e52228 (2013)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Olli Tikkanen Piia Haakana Arto J Pesola Keijo Häkkinen Timo Rantalainen Marko Havu Teemu Pullinen Taija Finni Muscle activity and inactivity periods during normal daily life.
description	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 (EMG(MVC)) 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 EMG(MVC)). During normal daily life the average EMG amplitude was 4.0±2.6% and average activity burst amplitude was 5.8±3.4% of EMG(MVC) (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 EMG(MVC)). 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% EMG(MVC) 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.
format	article
author	Olli Tikkanen Piia Haakana Arto J Pesola Keijo Häkkinen Timo Rantalainen Marko Havu Teemu Pullinen Taija Finni
author_facet	Olli Tikkanen Piia Haakana Arto J Pesola Keijo Häkkinen Timo Rantalainen Marko Havu Teemu Pullinen Taija Finni
author_sort	Olli Tikkanen
title	Muscle activity and inactivity periods during normal daily life.
title_short	Muscle activity and inactivity periods during normal daily life.
title_full	Muscle activity and inactivity periods during normal daily life.
title_fullStr	Muscle activity and inactivity periods during normal daily life.
title_full_unstemmed	Muscle activity and inactivity periods during normal daily life.
title_sort	muscle activity and inactivity periods during normal daily life.
publisher	Public Library of Science (PLoS)
publishDate	2013
url	https://doaj.org/article/23dbf05648cd42bd8c125906477162c3
work_keys_str_mv	AT ollitikkanen muscleactivityandinactivityperiodsduringnormaldailylife AT piiahaakana muscleactivityandinactivityperiodsduringnormaldailylife AT artojpesola muscleactivityandinactivityperiodsduringnormaldailylife AT keijohakkinen muscleactivityandinactivityperiodsduringnormaldailylife AT timorantalainen muscleactivityandinactivityperiodsduringnormaldailylife AT markohavu muscleactivityandinactivityperiodsduringnormaldailylife AT teemupullinen muscleactivityandinactivityperiodsduringnormaldailylife AT taijafinni muscleactivityandinactivityperiodsduringnormaldailylife
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Muscle activity and inactivity periods during normal daily life.

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