Cite this article:
Parganiha, Soni and Kumarpati (2010). Covert Weakening of Circadian Organization in a Cohort of Rotational Shift Workers. Journal of Ravishankar University (Part-B: Science), 23(1), pp. 50-56.
Journal of Ravishankar University-B, 23(1), 50-56 (2010)
Covert Weakening
of Circadian Organization in a Cohort of Rotational
Shift
Workers
Arti Parganiha*, Rakesh Kumar Soni and
Atanu Kumarpati
School of Life Sciences,
Pt. Ravishankar Shukla
University, Raipur, 492010, India
Abstract: We monitored rest-activity rhythm,
using
the technique
of wrist actigraphv, in 20 rotational shift
workers
(SWs) who have ample opportunity to sleep while availing night shift. This rhythm
was also assessedin 20 day workers
(DWs). Data were gathered at one-minute
epoch length and were analyzed
to determine period (T), autocorrelation
coefficient (r24) and dichotomy
index (J<O).
Circadian periodicity (t=24 h) was the dominant feature
among all DWs and most of the SWs, irrespective of the shifts. Only a solitary SW exhibited
an exceptionally longer period
(t = 29.6 h). The DWs exhibited bimodal rhythm in rest-activity profile characterized by two prominent periods. However, this bimodaiity was
absent in most of the SWs, irrespective
of shifts.
Shift workers of the CSEB, despite on-job sleep availability, exhibited covert weakening of the circadian organization, gauzed from lower values of autocorrelation coefficient (r24) and dichotomy
index (l<O)
for rest-activity rhythm.
Relevance to industry:
The results of this study would
immensely
be useful for optimizing the cognitive
ability
of industrial workers on rotational shift work or night shift.
Keywords: Autocorrelation coefficient,
Circadian period, Dichotomy index, On-job sleep,
Rest-activity
Corresponding author. arti.parganiha@gmail.com
NOTE: Full version of this manuscript is available in PDF.