pyActigraphy.light.LightMetricsMixin.LMX¶

LightMetricsMixin.LMX(length='5h', lowest=True)[source]¶

Least or Most light period of length X

Onset and mean hourly light exposure levels during the X least or most bright hours of the day.

Parameters

length (str, optional) – Period length. Default is ‘5h’.
lowest (bool, optional) – If lowest is set to True, the period of least light exposure is considered. Otherwise, consider the period of most light exposure. Default is True.

Returns

lmx_t, lmx – Onset and mean hourly light exposure level.

Return type

(pd.Timedelta, float)

Notes

The LMX variable is derived from the L5 and M10 defined in [1] as the mean hourly activity levels during the 5/10 least/most active hours.

References

1: Van Someren, E.J.W., Lijzenga, C., Mirmiran, M., Swaab, D.F. (1997). Long-Term Fitness Training Improves the Circadian Rest-Activity Rhythm in Healthy Elderly Males. Journal of Biological Rhythms, 12(2), 146–156. http://doi.org/10.1177/074873049701200206