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Featured researches published by Ml Wong.


Psychoneuroendocrinology | 2014

Aerobic exercise interacts with neurotrophic factors to predict cognitive functioning in adolescents

Tatia M.C. Lee; Ml Wong; Benson Wui-Man Lau; Jada Chia-Di Lee; Suk-Yu Yau; Kf So

Recent findings have suggested that aerobic exercise may have a positive effect on brain functioning, in addition to its well-recognized beneficial effects on human physiology. This study confirmed the cognitive effects of aerobic exercise on the human brain. It also examined the relationships between exercise and the serum levels of neurotrophic factors (BDNF, IGI-1, and VEGF). A total of 91 healthy teens who exercised regularly participated in this study. A between-group design was adopted to compare cognitive functioning subserved by the frontal and temporal brain regions and the serum levels of neurotrophic factors between 45 regular exercisers and 46 matched controls. The exercisers performed significantly better than the controls on the frontal and temporal functioning parameters measured. This beneficial cognitive effect was region-specific because no such positive cognitive effect on task-tapping occipital functioning was observed. With respect to the serum levels of the neurotrophic factors, a negative correlation between neurotrophic factors (BDNF and VEGF) with frontal and medial-temporal lobe function was revealed. Furthermore, the levels of BDNF and VEGF interacted with exercise status in predicting frontal and temporal lobe function. This is the first report of the interaction effects of exercise and neurotrophic factors on cognitive functioning. Herein, we report preliminary evidence of the beneficial effects of regular aerobic exercise in improving cognitive functions in teens. These beneficial effects are region-specific and are associated with the serum levels of neurotrophic factors. Our findings lay the path for future studies looking at ways to translate these beneficial effects to therapeutic strategies for adolescents.


Chronobiology International | 2013

“Social Jetlag” in Morning-Type College Students Living On Campus: Implications for Physical and Psychological Well-being

Esther Yuet Ying Lau; Ml Wong; Eddie Ng; Chi-chiu Harry Hui; Shu Fai Cheung; Doris Shui Ying Mok

Although on-campus residence allows easier access to campus facilities, existing studies showed mixed results regarding the relationship between college residence and students’ well-being indicators, such as sleep behaviors and mood. There was also a lack of studies investigating the role of chronotype in the relationship between on-campus residence and well-being. In particular, the temporal relationships among these factors were unclear. Hence, this longitudinal study aims to fill in these gaps by first reporting the well-being (measured in terms of mood, sleep, and quality of life) among students living on and off campus across two academic semesters. We explored factors predicting students’ dropout in university residences. Although students living on campus differ in their chronotypes, activities in campus residence (if any) are mostly scheduled in the nighttime. We therefore tested if individual differences in chronotype interact with campus residence in affecting well-being. Our final sample consisted of 215 campus residents and 924 off-campus-living students from 10 different universities or colleges in Hong Kong or Macau. Their mean age was 20.2 years (SD = 2.3); 6.5% of the participants are female. Participants completed self-reported questionnaires online on their sleep duration, sleep quality, chronotype, mood, and physical and psychological quality of life. Across two academic semesters, we assessed if students living on and off campus differed in our well-being measures after we partialed out the effects of demographic information (including age, sex, family income, and parents’ education) and the well-being measures at baseline (T1). The results showed that, campus residents exhibited longer sleep duration, greater sleep efficiency, better sleep quality, and less feeling of stress than off-campus-living students. From one semester to the next, around 10% of campus residents did not continue to live on campus. Logistic regression showed that a morning type was the strongest factor predicting dropout from campus residence. Chronotype significantly moderated the effects of campus residence on participants’ physical and psychological quality of life. Although morning-type off-campus-living students have better well-being than their evening-type peers living off campus, morning-type campus residents had worse well-being than other campus residents and they were more likely to discontinue living on campus after one semester. Our findings bear practical significance to college management that morning-type campus residents are shown to be experiencing deteriorating well-being. The authorities may need to review and revise the room-allocation policy in campus residence in improving the well-being among campus residents.


PLOS ONE | 2015

Rapid-eye-movement-sleep (REM) associated enhancement of working memory performance after a daytime nap

Esther Yuet Ying Lau; Ml Wong; Kristy Nga Ting Lau; Florence Wai Ying Hui; Chia-huei Tseng

The main objective was to study the impact of a daytime sleep opportunity on working memory and the mechanism behind such impact. This study adopted an experimental design in a sleep research laboratory. Eighty healthy college students (Age:17-23, 36 males) were randomized to either have a polysomnography-monitored daytime sleep opportunity (Nap-group, n=40) or stay awake (Wake-group, n=40) between the two assessment sessions. All participants completed a sleep diary and wore an actigraph-watch for 5 days before and one day after the assessment sessions. They completed the state-measurement of sleepiness and affect, in addition to a psychomotor vigilance test and a working memory task before and after the nap/wake sessions. The two groups did not differ in their sleep characteristics prior to and after the lab visit. The Nap-group had higher accuracy on the working memory task, fewer lapses on the psychomotor vigilance test and lower state-sleepiness than the Wake-group. Within the Nap-group, working memory accuracy was positively correlated with duration of rapid eye movement sleep (REM) and total sleep time during the nap. Our findings suggested that “sleep gain” during a daytime sleep opportunity had significant positive impact on working memory performance, without affecting subsequent nighttime sleep in young adult, and such impact was associated with the duration of REM. While REM abnormality has long been noted in pathological conditions (e.g. depression), which are also presented with cognitive dysfunctions (e.g. working memory deficits), this was the first evidence showing working memory enhancement associated with REM in daytime napping in college students, who likely had habitual short sleep duration but were otherwise generally healthy.


Journal of Psychosomatic Research | 2013

The interplay between sleep and mood in predicting academic functioning, physical health and psychological health: A longitudinal study

Ml Wong; Esther Yuet Ying Lau; Jacky Ho Yin Wan; Shu Fai Cheung; C. Harry Hui; Doris Shui Ying Mok


Sleep Medicine | 2017

Psychometric properties of the Sleep Condition Indicator and Insomnia Severity Index in the evaluation of insomnia disorder

Ml Wong; Kristy Nga Ting Lau; Colin A. Espie; Annemarie I. Luik; Simon D. Kyle; Esther Yuet Ying Lau


Archive | 2012

The relationship between sleep quality and daytime sleepiness with chronotype latent constructs: An exploratory and confirmatory factor analysis in Chinese college students

Ml Wong; Eyy Lau; Hy Wan; Hcc Hui; Shu Fai Cheung; Dsy Mok


Sleep and Biological Rhythms | 2017

Sleep-related daytime consequences mediated the neuroticism-depression link

Ml Wong; Jinxiao Zhang; Yun Kwok Wing; Esther Yuet Ying Lau


Sleep Medicine | 2017

Influence of chronic short sleep and a daytime nap opportunity on emotion-related inhibitory control in young adults

Esther Yuet Ying Lau; Ml Wong; Kristy Nga Ting Lau; Ka-Fai Chung; B. Rusak


Sleep Medicine | 2017

Impact of habitual short sleep and perceived sleep need on risk-taking in young people

Ml Wong; Chia-huei Tseng; Y.K. Wing; B. Rusak; T.M.C. Lee; Esther Yuet Ying Lau


Archive | 2017

Interaction of sleep and regular exercise in adolescents’ and young adults’ working memory

Esther Yuet Ying Lau; Gervais Wing-Lam Cheung; Ml Wong

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E. Lau

University of Hong Kong

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Knt Lau

University of Hong Kong

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Y.K. Wing

The Chinese University of Hong Kong

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Benson Wui-Man Lau

Hong Kong Polytechnic University

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C. Harry Hui

University of Hong Kong

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C. Leung

University of Hong Kong

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