Navigation Links
Study is the first to link sleep duration to infant growth spurts
Date:4/30/2011

DARIEN, Ill. A study in the May 1 issue of the journal Sleep is the first to show that increased bursts of sleep among infants are significantly associated with growth spurts in body length.

Results show that infants had irregular bursts of sleep, with 24-hour sleep duration increasing at irregular intervals by an average of 4.5 hours per day for two days. The number of sleep episodes per day also increased in intermittent bursts of an average of three extra naps per day for two days. These peaks in total daily sleep duration and number of sleep episodes were significantly associated with measurable growth spurts in body length, which tended to occur within 48 hours of the recorded bursts of sleep. Further analysis found that the probability of a growth spurt increased by a median of 43 percent for each additional sleep episode and 20 percent for each additional hour of sleep.

"The results demonstrate empirically that growth spurts not only occur during sleep but are significantly influenced by sleep," said principal investigator and lead author Dr. Michelle Lampl, Samuel Candler Dobbs Professor in the department of anthropology at Emory University in Atlanta, Ga. "Longer sleep corresponds with greater growth in body length."

Lampl added that the results may be particularly helpful for parents, who can become easily frustrated by the variability and unpredictability of an infant's sleep patterns.

"On a practical, everyday level, it helps parents understand their infant's behavior and patterns," she said.

The study involved 23 parents who consistently recorded daily sleep records for their infant, providing 5,798 daily records for analysis. The median age of the 14 girls and nine boys at study onset was 12 days. All infants were healthy at birth and free of colic or medical complications during their first year. For a duration ranging from four to 17 continuous months, growth in total body length was assessed using the maximum stretch technique, which was performed semi-weekly for 18 infants, daily for three infants and weekly for two infants.

According to Lampl and co-author Michael Johnson, PhD, professor of pharmacology in the University of Virginia Health System, the exact nature of the relationship between sleep biology and bone growth is unclear. However, they noted that the secretion of growth hormone is known to increase after sleep onset and during the stage of slow wave sleep. This change in hormonal signals during sleep could stimulate bone growth, which would support anecdotal reports of "growing pains," the aching limbs that can wake children at night.

Although a statistically significant relationship between bursts of sleep and growth spurts was found in all infants, the correspondence was imperfect. Some sleep alterations occurred without a growth spurt, and not every growth spurt was preceded by a burst of sleep.

Lampl and Johnson speculate that in some cases growth may have occurred in other parts of the body. For example, another new study they are publishing this month found that infant head circumference grows in intermittent, episodic spurts. They also suggest that sleep may be only one component of an integrated, physiological system that underlies growth timing.

The study is also significant, added Lampl, because it adds a novel finding to the interdisciplinary, multi-faceted body of research targeted at answering the question, "Why do we sleep?"

"It opens another door to understanding why we sleep," she said. "We now know that sleep is a contributing factor to growth spurts at the biological level."


'/>"/>

Contact: Emilee McStay
emcstay@aasmnet.org
630-737-9700
American Academy of Sleep Medicine
Source:Eurekalert

Related medicine news :

1. Despite Treatment, Employees with Depression Generate Higher Absentee Costs, According to Thomson Reuters Study
2. American Council on Exercise (ACE) Study Reveals Kettlebells Provide Powerful Workout in Short Amount of Time
3. TV drama can be more persuasive than news program, study finds
4. Study carried out into biological risks of eating reptiles
5. Neuroimaging study may pave way for effective Alzheimers treatments
6. Study finds racial gaps continue in heart disease awareness
7. Luth Researchs IndicatorEDG(TM) Study Finds Americans Hopes of Achieving Their Dreams Are Fading
8. First blinded study of venous insufficiency prevalence in MS shows promising results
9. Soothing infants with food focus of childhood obesity study
10. People with anxiety disorder less able to regulate response to negative emotions, study shows
11. American Heart Association Rapid Access Journal Report: Study Finds Racial Gaps Continue in Heart Disease Awareness, Low Knowledge of Heart Attack Warning Signs Among Women
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:8/23/2017)... ... August 23, 2017 , ... Virsys12, ... strategic growth plans, announcing the hiring of Kevin Keelan as a Senior Account ... seasoned sales manager, Keelan will be working with Virsys12 senior leadership to extend ...
(Date:8/22/2017)... ... August 22, 2017 , ... ... of unique masks and serums that perfectly fuse the beauty of naturally derived ... the 2017 Indie Beauty Expo on August 23rd & 24th in New York ...
(Date:8/22/2017)... ... August 22, 2017 , ... ... the addition of Zack Tisch as the firm’s new Consulting Services Executive. Mr. ... consulting firm’s national accounts, from assisting clients with initial vendor selection and pre-implementation ...
(Date:8/22/2017)... DFW Metroplex, TX (PRWEB) , ... August 22, 2017 , ... Five Star Glass is ... They provide repair and replacement of auto glass for most makes and models, in ... area in the USA. , They have been a family owned business for the ...
(Date:8/22/2017)... ... , ... “Covert Awakening”: Walid’s spiritual journey from Islamic terrorist ... a consultant for the Intelligence Community. For more than ten years, she ... region. Julianne has written hundreds of reports for the US government analyzing ...
Breaking Medicine News(10 mins):
(Date:8/4/2017)... , Aug. 4, 2017 The search ... shortly after a physician/patient consult has long been the ... was a notable focus of the largest meeting of ... according to healthcare market research firm Kalorama Information.  The ... testing (POCT) offerings or related supplies and software were ...
(Date:8/3/2017)... -- Opioid addiction and other drugs of abuse, blood poisoning ... outcomes, were problems taken on directly as laboratory professionals, ... them, met this week. This according to Kalorama Information. ... abuse, procalcitonin and acute kidney injury were key focuses ... in San Diego, CA.  Mechanisms ...
(Date:8/2/2017)... and BENTON, Ky. , Aug. 2, 2017   Marshall County ... its environmental services (ES) team to proactively reduce the risk of hospital-acquired infections (HAIs). The ... disinfection robot that uses UVC light energy to kill deadly pathogens such as C. ... Tru-D SmartUVC ... Tru-D in action in ...
Breaking Medicine Technology: