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Pak-Kwong Chung and Ka-Man Leung

This study examined the psychometric properties of the eight-item Physical Activity Enjoyment Scale (PACES) in Hong Kong older adults. Study 1 assessed the scale’s factor validity and test–retest reliability, whereas Study 2 examined its convergent validity in Hong Kong older adults. A total of 168 (Study 1) older adults completed the PACES twice over a 2-week interval, and 57 (Study 2) older adults completed both the eight-item PACES and a measure of quality of life. The results of both studies showed that the eight-item PACES had a high degree of internal consistency. Both the composite reliability and average variance extracted from Study 1 were high, suggesting that as a set, the eight items of the PACES reliably measured the construct. The observed test–retest reliability was satisfactory over a 2-week interval. This eight-item PACES is an expedited and reliable instrument for assessing physical activity enjoyment in Chinese older adults.

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Jing Dong Liu and Pak-Kwong Chung

Purpose: The purpose of this study was two-fold: to examine the motivational profiles of secondary school students in physical education classes, and to examine the associations between the students’ motivational profile characteristics and positive and negative affective experiences. Methods: A total of 1,570 students from Hong Kong were invited to complete four questionnaires: the Perceived Locus of Causality Scale, the Psychological Needs Satisfaction Scale in Physical Education, The Psychological Needs Thwarting Scale in Physical Education, and the International Positive and Negative Affect Schedule Short Form. A two-step cluster analysis was performed to explore the motivational profiles while MANOVAs were conducted to examine the criterion validity of the cluster analysis and differences on affective outcomes between motivational profiles. Results: Four motivational profiles were identified: non-self-determined, moderate controlled and low autonomous (Mod C-Low AU), high controlled and moderate autonomous (High C-Mod AU), and self-determined. The results revealed that students in different profiles reported different affective experiences. Conclusion: Motivational profiles based on self-determination theory may be better explained from a psychological needs perspective, and students in different profiles may undergo different affective experiences.

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Jing Dong Liu and Pak-kwong Chung

The current study presents the development process and initial validation of a measure designed for assessing psychological needs thwarting (frustration) in a secondary school physical education context (Psychological Needs Thwarting Scale in Physical Education, PNTSPE). Secondary school students (grades 7–9) from Hong Kong (N = 1258) were invited to participate in three studies. In Study 1, item generation and initial content validity of the PNTSPE were achieved. In Study 2, the factorial structure of the measure was tested using exploratory and confirmatory factor analysis. Internal consistency reliabilities of the subscales were also examined. In Study 3, the reliability and validity of the scores derived from the PNTSPE were further examined in an independent sample. Overall, the findings from the three studies provided initial psychometric evidence for the PNTSPE and suggested that the PNTSPE could be used as a valid and reliable measure to assess Hong Kong secondary school students’ psychological needs thwarting in physical education.

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Ka Man Leung and Pak-Kwong Chung

This study examined the associations between physical environment, social environment, and walking for transportation and recreation among older adults in Hong Kong. Cross-sectional data from 450 older adults (79 years or younger [71.9%], female [79.7%]) from 18 districts in Hong Kong were used. The participants’ perceptions of their physical and social environments were collected, and their walking behaviors were self-reported. The results revealed that positive physical environment facilitators and social environments were associated with increased total walking. Only positive physical environment facilitators were associated with increased walking for transportation, and physical and social environments had no notable effect on walking for recreation. These findings suggest that policy makers and walking intervention designers should develop strategies to enhance physical and social environments to promote total walking and walking for transportation.

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Yanan Zhao, Pak-Kwong Chung and Tomas K. Tong

This study evaluated the effectiveness of the community-based Exercise for Balance Improvement Program (ExBP) in improving dynamic balance (DB) and static balance with compromised sensations and reducing fear of falling (FF) among older nonfallers. Sixty-one participants (70 ± 3 years) at risk for falling were randomly allocated to receive ExBP practice for 16 weeks, Tai Chi (TC), or no treatment (CON) with an 8-week follow-up. The ExBP group exhibited significant improvements in DB (2.18, 95% CI = 1.16–3.19), static balance with compromised vision and somatosensation (ECSS; 0.46, 95% CI = 0.06–0.85), and FF (8.65, 95% CI = 0.52–16.8). After the intervention, the ExBP group showed significantly more improvement than did the CON group in DB, static balance with compromised somatosensation, and ECSS. No significant difference was observed between the ExBP and TC groups. Therefore, the ExBP can be applied as an effective alternative exercise regimen for improving balance and fall efficacy for older nonfallers.

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Ka-Man Leung, Pak-Kwong Chung, Tin-Lok Yuen, Jing Dong Liu and Donggen Wang

This study evaluated the psychometric properties of a Chinese version of the 24-item Social Environment Questionnaire (SEQ-C). Confirmatory factor analysis was used to examine the factor validity and measurement invariance (Purpose 1) of the SEQ-C in 453 older adults in Hong Kong. Convergent validity (Purpose 2) and test–retest reliability (Purpose 3) were also measured. The results of the confirmatory factor analysis and measurement invariance supported the four-factor structure (representing companionship, encouragement, neighborhood social cohesion, and role models) of the SEQ-C, in a 15-item model that closely fitted the data. The SEQ-C was also found to have acceptable to satisfactory internal consistency, test–retest reliability, composite reliability, and moderate convergent validity in correlating perceived social support. This study showed that the SEQ-C is a suitable means of measuring the social environments of older adults in Hong Kong.

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Yanping Duan, Walter Brehm, Petra Wagner, Pak-Kwong Chung, Sebastian Graf, Ru Zhang and Gangyan Si

Background:

A successful transition from late adolescence to adulthood is essential. Physical activity (PA) can support this process and lead to positive health outcomes. The change in PA from inactive to active stages is influenced by psychosocial correlates, and as such, this study tested the relationships among psychosocial correlates, stages of change for PA and health outcomes in university students from Hong Kong (n = 404) and Germany (n = 366).

Methods:

The questionnaire contained (1) PA and stages of change; (2) 10 psychosocial correlates including outcome expectations, affective attitude, barriers, self-efficacy, body-concept, plans, intrinsic motivation, activity emotions, assessment of activity situation, and social support; and (3) 5 health outcomes, including fitness, subjective well-being, health satisfaction, physical complaints, and BMI.

Results:

Barriers and intrinsic motivation were the critical psychosocial variables related to stages of change. Specific planning was more important for Hong Kong students’ stage progression within inactive stages. Competitive or enjoyable PA programs were more effective for male students moving from inactive to active stages. The link between stages of change for PA and health outcomes (ie, fitness, health satisfaction) was well established.

Conclusion:

Public health researchers should conduct effective psychosocial interventions that motivate young adults to engage in PA for positive health outcomes.

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Stephen H.S Wong, Oi Won Chan, Ya Jun Chen, Heng Long Hu, Ching Wan Lam and Pak Kwong Chung

Purpose:

This study examined the effect of consuming carbohydrate- (CHO) electrolyte solution on running performance after different-glycemic-index (GI) meals.

Methods:

Nine men completed 3 trials in a randomized counterbalanced order, with trials separated by at least 7 days. Two hours before the run after an overnight fast, each participant consumed a high-GI (GI = 83) or low-GI (GI = 36) CHO meal or low-energy sugar-free Jell-O (GI = 0, control). The 2 isocaloric GI meals provided 1.5 g available CHO/kg body mass. During each trial, 2 ml/kg body mass of a 6.6% CHO-electrolyte solution was provided immediately before exercise and every 2.5 km after the start of running. Each trial consisted of a 21-km performance run on a level treadmill. The participants were required to run at 70% VO2max during the first 5 km of the run. They then completed the remaining 16 km as fast as possible.

Results:

There was no difference in the time to complete the 21-km run (high-GI vs. low-GI vs. control: 91.1 ± 2.0 vs. 91.8 ± 2.2 vs. 92.9 ± 2.0 min, n.s.). There were no differences in total CHO and fat oxidation throughout the trials, despite differences in preexercise blood glucose, serum insulin, and serum free-fatty-acid concentrations.

Conclusion:

When a CHO-electrolyte solution is consumed during a 21-km run, the GI of the preexercise CHO meal makes no difference in running performance.