Exercise as a Non-Drug Intervention to Improve Body Composition and Cardiometabolic Health in Middle-Aged Saudi Men: A Community-Based Study in Al-Ahsa

Technical Summary: Exercise as a Non-Drug Intervention for Middle-Aged Saudi Men

Problem Statement
The Kingdom of Saudi Arabia faces a critical public health crisis characterized by high prevalence rates of obesity, type 2 diabetes, dyslipidemia, and hypertension, particularly among middle-aged men. These conditions, exacerbated by sedentary lifestyles, urbanization, and dietary westernization, contribute significantly to the burden of metabolic syndrome and non-communicable diseases (NCDs). While pharmacological interventions are effective, they often address downstream symptoms rather than upstream causes, incur lifelong costs, and carry side effects. Conversely, non-pharmacological lifestyle interventions, specifically structured exercise, are recognized globally as first-line therapeutic strategies. However, there is a scarcity of community-based evidence within the Saudi context demonstrating the efficacy of such interventions for apparently healthy but at-risk sedentary men. Existing studies in the region are often hospital-based or involve small, clinically recruited samples, limiting their generalizability to the broader community.

Methodology
This study employed a quasi-experimental, pre-post controlled trial design to evaluate a 12-week community-based exercise program.

• Participants: Thirty sedentary, overweight, or obese Saudi men (aged 40–55 years) were recruited from Al-Ahsa. Participants were assigned to an experimental group (n=15) or a control group (n=15) based on convenience allocation.
• Intervention: The experimental group underwent a progressive, combined exercise program supervised by qualified physiologists and specialists. The regimen consisted of four 60–75 minute sessions per week over 12 weeks, integrating:
  • Aerobic Training: 20–25 minutes (treadmill, cycling, elliptical) at 50–80% of maximum heart rate.
  • Resistance Training: 20–25 minutes targeting major muscle groups using machines and free weights, progressing from 2 sets of 12–15 reps to 3 sets of 8–10 reps.
  • Flexibility/Core: Warm-up, cool-down, and specific core stability exercises (planks, bird-dog) included in every session.
• Control: The control group maintained their usual sedentary routines without new exercise or diet plans.
• Measurements: Assessments were conducted at baseline and post-intervention (Week 13) in a climate-controlled laboratory. Metrics included:
  • Body Composition: Anthropometry, BMI, and body fat percentage/mass via bioelectrical impedance (InBody 270).
  • Physical Fitness: Grip strength, leg/back strength, core endurance (plank), agility (T-test), balance, flexibility (sit-and-reach), and explosive power (broad jump).
  • Cardiometabolic Biomarkers: Blood pressure, resting heart rate, vital capacity, fasting glucose, HbA1c, lipid profile (Total, LDL, HDL, Triglycerides), and lactate levels (resting and post-exercise).
• Analysis: Statistical analysis utilized paired and independent sample t-tests with a significance level of α = 0.05. Effect sizes were calculated using Cohen's d.

Key Results
The experimental group demonstrated statistically significant (p < 0.001) and clinically meaningful improvements across all 26 measured variables, with large effect sizes (Cohen's d ranging from 1.00 to 2.15). The control group showed no significant changes, with some parameters indicating slight deterioration.

• Body Composition: The experimental group experienced a mean weight loss of 5.34 kg, a BMI reduction of 1.84 kg/m², a 4.28% decrease in body fat percentage, and a 5.36 kg reduction in fat mass.
• Physical Fitness: Significant gains were observed in muscular strength (grip: +4.74 kg; leg: +17.82 kg), core endurance (plank hold: +27.16 seconds), agility (T-test: -1.68 seconds), and flexibility (+5.82 cm).
• Cardiometabolic Health:
  • Blood Pressure: Systolic BP decreased by 8.16 mmHg and diastolic by 6.22 mmHg, shifting participants from Stage 1 hypertension to elevated/normal ranges.
  • Lipid Profile: Total cholesterol dropped by 22.58 mg/dL, triglycerides by 28.36 mg/dL, and LDL by 18.40 mg/dL, while HDL increased by 6.38 mg/dL.
  • Glycemic Control: Fasting glucose decreased by 12.82 mg/dL, and HbA1c reduced by 0.42%, moving the group mean from the prediabetic range to normoglycemic levels (5.76%).
  • Metabolic Efficiency: Resting lactate decreased by 0.44 mmol/L, and post-exercise lactate decreased by 1.74 mmol/L, indicating improved oxidative capacity and lactate clearance. Vital capacity increased by 462 mL.

Significance and Claims
The paper asserts that a structured, community-based combined exercise program is a potent non-pharmacological intervention capable of reversing adverse body composition, diminished fitness, and deteriorated cardiometabolic profiles in sedentary, overweight middle-aged Saudi men.

• Clinical Impact: The study claims that the observed improvements allow participants to transition from high-risk clinical categories (obesity, hypertension, prediabetes, atherogenic lipid profiles) to lower-risk or normal ranges without a single milligram of medication. This suggests a direct reduction in the lifetime risk of myocardial infarction, stroke, type 2 diabetes, and premature cardiovascular mortality.
• Policy Relevance: The findings support the health promotion pillars of Saudi Vision 2030. The author argues that these results provide an evidence base for scaling up community sports infrastructure, integrating exercise referral systems into primary care, and subsidizing exercise accessibility as a cost-effective strategy to reduce the NCD burden.
• Feasibility: With a high adherence rate (91.4%) and the use of standard community facility equipment, the study demonstrates that such programs are feasible, safe, and replicable in the Saudi context, offering a scalable alternative to purely clinical or pharmacological management.

Limitations Noted by the Authors
The author acknowledges several constraints: the small sample size (n=30) limits subgroup analyses; the non-randomized design carries a risk of selection bias (though mitigated by baseline equivalence); the 12-week duration does not assess long-term maintenance of benefits; the lack of nutritional surveillance means dietary changes could have influenced outcomes; the all-male sample limits generalizability to women; and the use of bioelectrical impedance, while validated, is less precise than DXA for body composition.