Example EMG data from laboratory and field measurements.

<p>Examples of averaged EMG data of left quadriceps femoris from one subject. Part A shows from the laboratory measurement session MVC of knee extension, lying down, standing still and squatting. Part B shows EMG activity during the entire day. Part C shows zoomed areas from daily EMG data (thick vertical lines show which parts of the data are zoomed). Horizontal lines represent baseline and 100% of EMG_MVC.</p

Inactivity times during normal daily life based on different thresholds.

<p>The first row represents results using individually determined threshold below standing activity (mean of four muscle groups) that is compared to the absolute % levels of each individual's EMG amplitude during maximal voluntary contraction (EMG_MVC).</p

Basic characteristics of the subjects.

<p>Significant difference between genders are expressed as</p>**<p>p<0.01;</p>***<p>p<0.001.</p

Analysis of burst characteristics and muscle activities.

<p>Schematic drawing depicting analysis of burst amplitude, duration, inactivity periods and differentiation to light, moderate and vigorous muscle activities. The thresholds for inactivity, light, moderate and vigorous activities were determined individually (see text).</p

Time spent at different EMG intensities (relative to isometric MVC) in normal daily life for women and men.

<p>Time expressed as percentage from total measurement time and as minutes and seconds.</p><p>Significant difference between genders are expressed as</p>*<p>p<0.05.</p

Average EMG activities at different thresholds that were defined from the standing and incremental treadmill walking test.

<p>Average EMG activities at different thresholds that were defined from the standing and incremental treadmill walking test.</p

Muscle activity levels during normal daily life.

<p>A) Time spent at different muscle activity levels during normal daily life based on individual threshold values (2.5±1.7, 6.3±3.7 and 14.2±8.8% EMG_MVC for inactivity, moderate activity and vigorous activity thresholds, respectively). Each line represents one individual (n = 84). B) Duration of mean (±SD) quadriceps and hamstring muscle activity at different intensities did not differ between males (n = 40) and females (n = 44) during an 11 hour measurement.</p