Working Performance

Adaptation to a shifts system depends on:

	Sleep Factors

	Circadian Factors

	Domestic Factors

Adaptation to a shift system means:

	Increase of Performance
	Increase of productivity
	Decrease of work accidents
	Decrease of absences
	Healthy working environment
	El uso ocasional de hipnóticos puede ser beneficioso

Individual Factors Asociated to Bad Adaptation

	Age over 50 years old.
	To have a second paid job
	High Load of domestic work
	"Early-rising or Alondra" Individuals
	History of Sleep Alterations
	Psychiatric Illness
	Gastrointestinal Disease Precedents
	Epilepsy
	Diabetes
	Cardiovascular Disease

Asociated Factors to Bad Adaptation to Shifts

	More than five days on duty without resting
	More than four nights of 12 hours of shift
	Begginning of the shift before 7:00am
	Rotation Change once a week
	Menos de 48 horas de descanso luego de 3 ciclos de turno
	Rotación hacia atrás
	Work involving too many weekends
	Critic monitoring tasks in a 12 hour shift
	Too long rotations
	Physical Heavy Work in the 12 hours shift.

Factors that Affect Sleeping

	Circadian Rhythm : The expression of circadian sleep rhythm and awakeness will be affected by environmental keys, particularly light.

	Age: over 25 years the ability to initiate the sleep at any time will be diminished.

	Pre-sleep Activation: mainly psychological factors; due date of a commitment, exams, work crisis, couple problems. Sexual activity. Bad habits such as: working in bed, click in the bedroom, dinning time.

	Use of drugs: energizers, sedatives, and hypnotics, use of Caffeine-alcohol-tobacco.

Caffeine
Its effect can last between 8 and 12 hours. With three cups of coffee (300 mg of caffeine), there is an increase in awakeness and a decrease in the total hours of sleep. Tea has 50mg per 200 ml and cola drinks 75 mg. The consumption higher than 500mg must be avoided.

Alcohol
To wake up anxious, headache, perspiration by the second half of sleep with a dosage of:

- scotch 100 ml;
- gin or vodka 150 ml;
- wine 450 ml;
- 1 liter of beer.

The liver metabolizes 30gr of alcohol per hour ( these measures are within three hours). Metabolization produces liberation of catecolamines.

Tobacco- Nicotine
In low concentrations it produces relaxation, and at high concentrations it produces colinergic stimulation that heads to excitement.

Caffein-Acohol-Nicotine
Late excitement effect, that affects in a higher degree people of over 45 years old.

Caffein in soft drinks 200 ml in Chile

-	Nescafe	115 mg
-	Diet Coke	25 mg
-	Pepsi	22 mg
-	Coke	18 mg
-	Tea	14 mg

Source: "SERNAC"

"áBecause Men is bigger than the sea and its islandsá"

Pablo Neruda. Alturas de Machu-Picchu

Effect in the practice of a task 6 times a day during 7 days a web for 29 weeks.