Physical activity and glycaemic control among adults with type 2 diabetes in Suva, Fiji: a cross sectional pilot study
Elizabeth Mundia
1
2
Abstract
Type 2 diabetes mellitus is a major health burden in Fiji (19.3% prevalence). Evidence suggests increased physical activity improves glycaemic control and health outcomes; however, this remains unstudied in Fiji’s population.
This study aimed to assess physical activity levels and explore its relationship with glycaemic control among diabetic patients.
A quantitative, cross-sectional pilot study was conducted at Samabula Health Center, Fiji, from September to November 2022 using convenience sampling for 174 adults with diabetes. The International Physical Activity Questionnaire, short form, assessed physical activity, whereas capillary fasting and random blood sugar assessed glycaemic control targets. Logistic regression analysed associations.
The study found 64% of participants were physically inactive, with females significantly less active than males (odds ratio (OR) = 0.49, 95% confidence interval (CI) = 0.25–0.98). Poor glycaemic control was common (75%), although adherence to lifestyle and pharmacological management plans were significantly associated with good control (OR = 2.37, 95% CI: 1.05–5.37). Increased physical activity levels were not significantly associated with meeting glycaemic control targets.
Despite clinic attendance, patients with diabetes remained inactive, had poor glycaemic control and were non-adherent to lifestyle and drug treatment. Contradicting previous evidence, physical activity was not associated with meeting glycaemic control targets, possibly reflecting point-of-care glucose variability compared to the gold-standard glycated hemoglobin measure (HbA1c), and cross-sectional study design limiting causal interpretation. Future research should investigate glycaemic control and physical activity barriers, especially among women, physician practices and test culturally adapted interventions. Fiji’s National Wellness Policy and Non-Communicable Disease (NCD) Strategic Plan must consider strengthening diabetes management guidelines, clinician training and patient support to address systemic gaps
Keywords: blood glucose, diabetes, diabetes mellitus, diabetes mellitus type 2, exercise, glycaemic control, physical activity, sedentary behaviour.
WHAT GAP THIS FILLS |
What is already known: Physical activity has a well-established role in diabetes primary care management. What this study adds: This research describes physical activity practices and glycaemic control in Fiji’s diabetic population, and identifies systemic gaps in guideline implementation and adherence while proposing future research and policy directions to improve diabetes care in Fiji. |
Introduction
Type 2 diabetes mellitus (T2DM) represents a growing global health challenge, with estimated prevalence projections reaching 10.9% by 2045,1 exceeding 40% in some Pacific nations,2 and 19.3% in Fiji.3 T2DM and its complications contribute significantly to mortality,2,4,5 and consume up to 20% of government health expenditure in some Pacific countries.6
Although non-modifiable risk factors including genetic and environmental factors contribute to disease development,7–9 modifiable risk factors such as diet and physical inactivity are hypothesised key contributors to rising T2DM rates in Fiji and the Pacific.10–14 The World Health Organization (WHO) defines physical activity as energy expenditure by skeletal muscle movement, recommending ≥150 min of moderate, or ≥75 min of vigorous activity or an equivalent combination weekly.15 However, high inactivity is reported in females, the elderly, and Fijians of Indian descent from national surveys,14 and patients with diabetes in regional studies.16,17
Global evidence including low-resource settings links physical activity with improved outcomes and glycaemic control.18–25 Pacific-based studies show mixed results,26–28 possibly because of sample size limitations and cultural barriers affecting participation,26,27,29 whereas no studies examine this relationship in Fiji’s diabetic population.
Fiji’s Diabetes Guideline is similar to international standards,4 yet, most patients (66%) have poor glycaemic control.2,4 Although recommending 30 min of moderate intensity physical activity, the guideline lacks specific instructions, potentially limiting patient understanding and implementation.
This pilot study addresses critical gaps, examining physical activity levels, sedentary behaviour and their association with glycaemic control among patients with diabetes in a Fijian clinic setting. Quantifying these relationships in Fiji’s high-burden, low-resource setting, will inform targeted interventions, manage guideline reforms and future research directions for Fiji, and in similar global or regional settings.
Methods
This single-centre, cross-sectional study conducted at Samabula Health Center, Suva, examined associations rather than causality in an urban setting (n = 18,054), comprising Fiji’s diverse socioeconomic and ethnic composition of predominantly iTaukei (Indigenous) and Fijians of Indian descent.
EpiInfo (CDC, Atlanta, GA, USA) determined a sample size of 200 (80% power, 5% error margin, 95% CI, 15.6% prevalence from Fiji’s 2011 STEPS Survey), with 220 structured questionnaires distributed by convenience sampling after considering 10% non-response (September to November 2022). Included were adults (≥18 years) with confirmed T2DM, attending two or more clinics or receiving pharmacological and/or lifestyle management. Unstable or newly diagnosed patients were excluded.
Sociodemographic characteristics
Participant sociodemographic (age, sex, marital status, ethnicity, education level, employment status, comorbidities) and clinical characteristics (body mass index (BMI), complications, adherence with management) were extracted from patient records.
Physical activity and sitting time measure
The International Physical Activity Questionnaire (IPAQ), short form, administered in English, Fijian and Hindi, measured physical activity as a metabolic equivalent task (MET-minutes/week) for each domain (walking, moderate and vigorous activity), and sitting time measured as a continuous variable (minutes/day). Incomplete data, extreme outliers (>960 min/week) and domain time variables >180 minutes/day were managed as per IPAQ scoring protocol data processing steps.30 Physical activity levels were defined as low (<600 MET-minutes/week), moderate (600–3000 MET-minutes/week) or high (>3000 MET-minutes/week), with ≥600 MET-minutes/week defining physically ‘active’ status for analysis, as per the IPAQ protocol and WHO recommendations.15 Despite recall bias risk from self-reporting, the standardised protocol for quantitative data analysis enables cross-study comparability.
Glycaemia measure
Point-of-care (POC) capillary random blood sugar (RBS) or fasting blood sugar (FBS) readings were used for clinical practicality and availability during the study period, despite varying sensitivity (17–87%) compared to HbA1c.31,32 Good specificity and clinical acceptability in stable patients33 support their widespread use to report glycaemic control.34,35 Following Fiji’s Diabetes Management Guideline (3rd edition) and international standards,4 glycaemic control was defined as ‘controlled’ if FBS is 4.0–7.0 mmol/L or RBS is 4.0–10.0 mmol/L, and ‘uncontrolled’ if FBS is >7.0 or RBS is >10.0 mmol/L.
Data analysis
Data were analysed using SPSS v28 (SPSS Inc, Chicago, IL, USA) with α = 0.05. Descriptive statistics included mean, median, standard deviation, frequencies and percentages. Bivariate and multivariable logistic regression assessed associations between sociodemographic parameters, glycaemic control and physical activity levels, with adjustment for covariates.
Purposeful selection of variables (Hosmer and Lemeshow method) was used for final multivariable logistical regression modelling,36 including predetermined variables regardless of P-values, variables with P < 0.25 in bivariate analysis, and exclusion of non-significant variables (P > 0.05) unless they changed exposure variable regression coefficients by >10%.
Results
Patient characteristics
Of 220 distributed questionnaires, 208 were returned (94.5% response rate). Following IPAQ protocol exclusions (outliers, n = 8; incomplete data, n = 26), 174 were analysed (mean age 60.45 ± 11.5 years; 53% female). Participants comprised 72% Fijians of Indian descent, 25% Indigenous Fijians (Itaukei), and 3% Other ethnicities. Table 1 displays further characteristics.
Variable | Number (%), n = 174 | |
---|---|---|
Age | ||
Mean (s.d.) | 60.45 (s.d. 11.48) | |
Sex | ||
Female | 93 (53) | |
Male | 81 (47) | |
Ethnicity | ||
Fijian of Indian descent | 125 (72) | |
Itaukei | 43 (25) | |
Others | 6 (3) | |
Setting seen | ||
Special outpatient clinic | 127 (73) | |
General outpatient clinic | 47 (27) | |
Marital status | ||
Married | 110 (63) | |
Widowed | 43 (25) | |
Single | 21 (12) | |
Education level | ||
Uneducated/Primary | 56 (32) | |
Secondary | 78 (45) | |
Tertiary | 40 (23) | |
Employment | ||
Employed | 47 (27) | |
Unemployed | 127 (73) | |
Complications | ||
Complications | 94 (54) | |
No complications | 80 (46) | |
Comorbidities | ||
Comorbidities | 154 (89) | |
No comorbidities | 20 (11) | |
Adherence | ||
Adherent | 104 (60) | |
Non-adherent | 70 (40) | |
BMI | ||
Underweight | 2 (1) | |
Normal | 46 (27) | |
Overweight | 60 (34) | |
Obese | 67 (39) | |
Glycaemic control | ||
Controlled | 43 (25) | |
Uncontrolled | 131 (75) |
s.d., standard deviation.
Most attended the facility’s special outpatient department (79%) and had comorbidities (89%), primarily hypertension (n = 124, 71%), chronic kidney disease (n = 39, 22%), cardiac conditions (n = 31, 18%) and dyslipidemia (n = 33, 19%). Common complications included nephropathy (n = 39, 22%), ischaemic heart disease (n = 27, 16%), retinopathy (n = 25, 14%), neuropathy (n = 17, 10%) and cataracts (n = 7, 4%).
Prevalence and factors affecting physical activity levels
Only 63 (36%) participants met physical activity targets. Active and inactive participants showed no significant difference (P = 0.86) in age, analysed continuously (Table 2). Males were more likely to be physical active (48%), with multivariate regression modelling demonstrating significantly reduced odds of physical activity in females (adjusted OR = 0.49, 95% CI = 0.25–0.98, P = 0.04). More Fijians of Indian descent reported being physically active, which became non-significant after adjustment (adjusted OR = 0.46, 95% CI: 0.19–1.08, P = 0.07). No other significant covariates were identified (Table 3).
Variable | Physical activity level | P-value | ||
---|---|---|---|---|
Active no. (%) | Inactive no. (%) | |||
Age | ||||
Mean (s.d.) | 60.3 (12.0) | 60.6 (11.2) | 0.86 | |
Sex | ||||
Male | 39 (48) | 42 (52) | 0.002 | |
Female | 24 (26) | 69 (74) | ||
Ethnicity | ||||
Fijian of Indian descent | 51 (41) | 74 (59) | 0.04 | |
Itaukei or other descent A | 12 (24) | 37 (76) | ||
Marital status | ||||
Married | 43 (39) | 67 (61) | 0.095 | |
Widowed | 10 (23) | 33 (77) | ||
Single | 10 (48) | 11 (52) | ||
Education level | ||||
Primary/Uneducated | 19 (34) | 37 (66) | 0.91 | |
Secondary | 29 (37) | 49 (63) | ||
Tertiary | 15 (37.5) | 25 (62.5) | ||
Employment status | ||||
Employed | 22 (47) | 25 (53) | 0.08 | |
Unemployed | 41 (32) | 86 (68) | ||
Complications | ||||
Complications | 32 (34) | 62 (66) | 0.52 | |
No complications | 31 (39) | 49 (61) | ||
Adherence | ||||
Adherent | 39 (37.5) | 65 (62.5) | 0.67 | |
Non-adherent | 24 (34) | 46 (66) | ||
Comorbidities | ||||
Comorbidities | 54 (35) | 100 (65) | 0.38 | |
No comorbidities | 9 (45) | 11 (55) | ||
Glycaemic control | ||||
Controlled | 15 (35) | 28 (65) | 0.84 | |
Uncontrolled | 48 (37) | 83 (63) | ||
BMI | ||||
Underweight/Normal B | 21 (45) | 26 (55) | 0.19 | |
Overweight | 23 (38) | 37 (62) | ||
Obese | 19 (28) | 48 (72) |
Variables | Odds of being physically active over inactive | ||||
---|---|---|---|---|---|
Unadjusted | Adjusted A | ||||
OR (95% CI) | P-value | OR (95% CI) B | P-value | ||
Age (years) | 0.998 (0.97–1.03) | 0.860 | 1.02 (0.98–1.05) B | 0.36 | |
Sex | |||||
Male | 1.00 (Reference) | 1.00 (Reference) | |||
Female | 0.38 (0.20–0.71) | 0.003 | 0.49 (0.24–0.98) | 0.04 | |
Ethnicity | |||||
Fijian of Indian descent | 1.00 (Reference) | 1.00 (Reference) | |||
Itaukei or other descent C | 0.47 (0.22–0.99) | 0.047 | 0.46 (0.19–1.08) | 0.07 | |
Marital status | |||||
Married | 1.00 (Reference) | 0.10 | 1.00 (Reference) | 0.12 | |
Widowed | 0.47 (0.21–1.06) | 0.07 | 0.47 (0.18–1.22) | 0.12 | |
Single | 1.42 (0.55–3.62) | 0.47 | 1.64 (0.60–4.48) | 0.34 | |
Education level | |||||
Primary/Uneducated | 1.00 (Reference) | 0.91 | 1.00 (Reference) | 0.79 | |
Secondary | 1.15 (0.56–2.37) | 0.70 | 1.29 (0.56–2.95) | 0.55 | |
Tertiary | 1.17 (0.50–2.72) | 0.72 | 1.40 (0.50–3.94) | 0.53 | |
Employment status | |||||
Unemployed | 1.00 (Reference) | ||||
Employed | 1.85 (0.93–3.66) | 0.08 | |||
Complications | |||||
No complications | 1.00 (Reference) | ||||
Complications | 0.82 (0.44–1.52) | 0.52 | |||
Comorbidities | |||||
No comorbidities | 1.00 (Reference) | ||||
Comorbidities | 0.66 (0.26–1.69) | 0.39 | |||
Adherence | |||||
Non-adherent | 1.00 (Reference) | 1.00 (Reference) | |||
Adherent | 1.15 (0.61–2.17) | 0.67 | 1.00 (0.50–2.00) | 0.999 | |
BMI | |||||
Underweight/Normal D | 1.00 (Reference) | 1.00 (Reference) | |||
Overweight | 0.77 (0.35–1.67) | 0.51 | 0.81 (0.35–1.87) | 0.63 | |
Obese | 0.49 (0.22–1.07) | 0.07 | 0.61 (0.26–1.46) | 0.27 |
Bold data signifies statistical significance (p < 0.05).
Sitting behaviour
Mean daily sitting time was 315 min (s.d. = 214; range 30–1200 min; median 270 min). Inactive participants showed a non-significant 50-min increase (n = 332, s.d. = 227) compared to active individuals (n = 284, s.d. = 186, P = 0.15).
Factors affecting glycaemic control
Over 70% of participants had uncontrolled diabetes across all stratified demographic and clinical variables (Table 4). No significant association emerged between PA levels and glycaemic control (adjusted OR = 1.05, 95% CI: 0.47–2.34, P = 0.90), possibly because of POC measurements or sample size constraints. However, medication or lifestyle management adherence was significantly associated with glycaemic control (adjusted OR = 2.37, 95% CI: 1.05–5.37, P = 0.04) (Table 5). Overweight and obese participants showed non-significant trends towards control (overweight: OR = 2.36, P = 0.10; obese: OR = 1.87, P = 0.24), whereas no other variables reached significance (Table 5).
Variables | Controlled n (%) | Uncontrolled n (%) | Total (n) | |
---|---|---|---|---|
Sex | ||||
Male | 17 (21) | 64 (79) | 81 | |
Female | 26 (28) | 67 (72) | 93 | |
Ethnicity | ||||
Fijian of Indian descent | 32 (26) | 93 (74) | 125 | |
Itaukei or Other descent A | 11 (22) | 38 (78) | 49 | |
Marital status | ||||
Married | 30 (27) | 80 (73) | 110 | |
Widowed | 11 (26) | 32 (74) | 43 | |
Single | 2 (10) | 19 (90) | 21 | |
Education level | ||||
Primary/No formal education | 14 (25) | 42 (75) | 56 | |
Secondary | 22 (28) | 56 (72) | 78 | |
Tertiary | 7 (18) | 33 (83) | 40 | |
Employment status | ||||
Employed | 13 (28) | 34 (72) | 47 | |
Unemployed | 30 (24) | 97 (76) | 127 | |
Complications | ||||
Complications | 22 (23) | 72 (77) | 94 | |
No complications | 21 (26) | 59 (74) | 80 | |
Adherence | ||||
Adherent | 31 (30) | 73 (70) | 104 | |
Non-adherent | 12 (17) | 58 (83) | 70 | |
Comorbidities | ||||
Comorbidities | 40 (26) | 114 (74) | 154 | |
No comorbidities | 3 (15) | 17 (85) | 20 | |
BMI | ||||
Underweight/Normal B | 8 (17) | 39 (83) | 47 | |
Overweight | 18 (30) | 42 (70) | 60 | |
Obese | 17 (25) | 50 (75) | 67 | |
Physical activity | ||||
Active | 15 (24) | 48 (76) | 63 | |
Inactive | 28 (25) | 83 (75) | 111 |
Variables | Odds of meeting glycaemic targets over not meeting them | ||||
---|---|---|---|---|---|
Unadjusted | Adjusted A | ||||
OR (95% CI) | P-value | OR (95% CI) B | P-value | ||
Age (years) | 1.01 (0.98–1.04) | 0.40 | 1.026 (0.98–1.08) | 0.27 | |
Sex | |||||
Male | 1.00 (Reference) | ||||
Female | 1.46 (0.73–2.94) | 0.29 | 1.76 (0.70–4.39) | 0.23 | |
Ethnicity | |||||
Fijians of Indian descent | 1.00 (Reference) | ||||
Itaukei or other descent C | 0.84 (0.39–1.84) | 0.67 | 1.03 (0.40–2.65) | 0.95 | |
Marital status | |||||
Married | 1.00 (Reference) | 0.26 | 0.34 | ||
Widowed | 0.92 (0.41–2.05) | 0.83 | 0.77 (0.26–2.26) | 0.64 | |
Single | 0.28 (0.06–1.28) | 0.47 | 0.32 (0.07–1.53) | 0.15 | |
Education level | |||||
Primary/Uneducated | 1.00 (Reference) | 0.45 | 0.54 | ||
Secondary | 1.18 (0.55–2.57) | 0.68 | 1.33 (0.52–3.39) | 0.55 | |
Tertiary | 0.64 (0.23––1.76) | 0.38 | 0.76 (0.23–2.48) | 0.65 | |
Employment status | |||||
Unemployed | 1.00 (Reference) | ||||
Employed | 1.24 (0.58–2.64) | 0.58 | 1.88 (0.67–5.26) | 0.23 | |
Complications | |||||
No complications | 1.00 (Reference) | ||||
Complications | 0.86 (0.43–1.71) | 0.67 | 0.83 (0.36–1.90) | 0.66 | |
Comorbidities | |||||
No comorbidities | 1.00 (Reference) | ||||
Comorbidities | 1.99 (0.55–7.15) | 0.29 | 1.59 (0.38–6.75) | 0.53 | |
Adherence | |||||
Non-adherent | 1.00 (Reference) | ||||
Adherent | 2.05 (0.97–4.35) | 0.06 | 2.37 (1.05–5.37) | 0.04 | |
BMI | |||||
Underweight/Normal D | 1.00 (Reference) | 0.25 | |||
Overweight | 2.09 (0.82–5.35) | 0.12 | 2.36 (0.86–6.46) | 0.10 | |
Obese | 1.66 (0.65–4.24) | 0.29 | 1.87 (0.66–5.30) | 0.24 | |
Physical activity | |||||
Inactive | 1.00 (Reference) | ||||
Active | 0.93 (0.45–1.91) | 0.84 | 1.05 (0.47–2.34) | 0.90 |
Discussion
This study assessed physical activity and glycaemic control associations among patients with T2DM attending an urban health centre in Suva, Fiji. Despite clinic attendance, high inactivity and uncontrolled diabetes were observed, with no significant association between physical activity and glycaemic control.
High inactivity rates (64%) are comparable to Pacific Islander population studies,16,17 and low resource settings utilising IPAQ, short form,37,38 whereas average sitting time (>5 h/day) aligns with global findings (4.8–5.8 h/day).39,40 Females had significantly lower odds of being active, which is consistent with regional27,29 and global findings.41,42 Previous studies suggest cultural barriers, poor family support and familial responsibilities27,29 influence physical activity in Pacific populations. Further exploration of local physical activity barriers is needed, particularly for females with diabetes. No other factors significantly affected physical activity levels (BMI, age), contrasting Pacific population-based studies.16,27,29
Physical activity showed no significant association with glycaemic control, contrasting global evidence,18,19,27,28,43 potentially because of small sample size, POC measurement, recall bias and the IPAQ, short form used, which variably correlates with objective measures of activity.44 Despite POC glucose variability, poor glycaemic control rates (75%) were similar to local and regional studies using HbA1c (66%).2,4 Consistent with existing literature, adherence to medication and lifestyle management improved glycaemic control (adjusted OR = 2.37, 95% CI: 1.05–5.37, P = 0.04).35,45–47 Although a potential confounding factor subject to social desirability bias, self-reported adherence was retained to assess self-management behavioural impacts. Despite this risk, physical activity remained unassociated with glycaemic control regardless of adherence status. Contrasting global literature, no other variables including sociodemographic, clinical and patient factors significantly influenced glycaemic control in this study.46
Study strengths include providing standardised measures (IPAQ) with confounder adjustment, identifying disparities and systemic gaps in diabetes guideline implementation. However, small sample size, potential selection and recall bias, cross-sectional design and single-site convenience sampling limit causal inference and generalisability.
Future research in Fiji should use mixed-methods design evaluating adherence, physical activity (particularly in women), glycaemic control and physician guideline adherence. Culturally adapted physical activity questionnaires and self-management interventions, proven to improve glycaemic control among Pacific populations,28 should be tested in Fiji. Where feasible, engaging multiple sites, random sampling, HbA1c and other confounders should be considered (smoking status, diabetes duration, medication type, family history, lipid profiles) to strengthen findings.
Findings demonstrate critical baseline gaps and opportunities for diabetes management and policy reforms in Fiji’s primary care setting. Persistently poor glycaemic control trends in Fiji suggest unaddressed systemic management barriers, whereas significant adherence-related improvements highlight promising intervention priority. Fiji’s National Wellness Policy and Non-Communicable Disease (NCD) Strategic Plan should strengthen guidelines, enhance primary care physician training and guideline adherence, and prioritise patient self-management strategies to improve outcomes and address these barriers.
Data availability
The datasets used and analysed during this study are available from the corresponding author on reasonable request.
Declaration of funding
A research grant was provided by the Fiji National University to support this study.
Acknowledgements
The authors wish to acknowledge the assistance of Dr Eunice Okyere, who provided considerable advice regarding the design of the study.
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