A Comparative Study of Antioxidant Status and Oxidative Stress Markers Among Traffic Workers in Rivers State.

A Comparative Study of Antioxidant Status and Oxidative Stress Markers Among Traffic Workers in Rivers State.

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ABSTRACT

Traffic workers in Rivers State face daily exposure to vehicular emissions, dust, and toxic pollutants. These hazards can increase oxidative stress and reduce the body’s antioxidant defenses. This study compares antioxidant status and oxidative stress markers between traffic workers and non-exposed individuals. I measured key antioxidants such as superoxide dismutase (SOD), catalase (CAT), glutathione (GSH), and oxidative markers like malondialdehyde (MDA). I also assessed lifestyle factors, including smoking, diet, and work duration, because they influence oxidative balance.

The results show that traffic workers consistently record higher MDA levels, which indicates increased lipid peroxidation. They also display lower antioxidant activities compared to the control group. These changes suggest that continuous exposure to fumes and pollutants raises oxidative stress and weakens antioxidant defenses. Consequently, this study highlights the need for regular health screening, improved protective measures, and public health interventions for traffic personnel in Rivers State.

CHAPTER ONE

1.0 Introduction

Rapid urbanization and heavy traffic flow in many Nigerian cities contribute to increased exposure to environmental pollutants. Rivers State, especially Port Harcourt, experiences dense traffic and frequent soot-related air quality issues. Traffic workers, including wardens, drivers, and conductors, spend long hours outdoors and inhale large amounts of exhaust fumes. Consequently, their risk of oxidative stress rises significantly.

Oxidative stress occurs when reactive oxygen species (ROS) overwhelm the body’s antioxidant defense system. When this imbalance persists, it can damage lipids, proteins, and DNA. Antioxidant enzymes such as SOD, CAT, and GSH help neutralize these harmful molecules. However, prolonged exposure to pollutants weakens these defense mechanisms. As a result, individuals in high-exposure occupations may develop chronic health issues over time.

Previous studies have shown that urban workers exposed to high pollution levels often display elevated oxidative stress markers. Although several studies exist globally, local data from Rivers State remain limited. Therefore, a comparative analysis is necessary to understand how occupational exposure affects antioxidant status among traffic workers in this region.

This study investigates the antioxidant profile and oxidative stress markers of traffic workers and compares them with a non-exposed group. The findings will provide evidence-based insights that policymakers and health authorities can use to design targeted interventions.

1.1 Background of the Study

Vehicular emissions release carbon monoxide, nitrogen oxides, lead, particulate matter, and volatile organic compounds. When inhaled repeatedly, these substances generate free radicals in the body. In response, the body increases antioxidant activity. However, constant exposure gradually exhausts these defenses and increases oxidative damage.

Traffic workers represent one of the most vulnerable groups because they spend long periods directing vehicles or working on busy roads. Many of them do not have protective equipment, and some already engage in lifestyles that raise oxidative risk, such as smoking or irregular eating. Therefore, studying their biochemical health gives a clearer picture of environmental risks in polluted areas.

1.2 Statement of the Problem

Traffic workers in Rivers State operate in environments characterized by high pollutant concentration. Many report symptoms such as headaches, breathing difficulty, persistent fatigue, and poor immune function. However, scientific data that link these symptoms to oxidative stress are limited. Without this evidence, authorities cannot design effective workplace safety policies. This gap justifies the need for a comparative biochemical study.

1.3 Aim of the Study

To compare antioxidant status and oxidative stress markers among traffic workers and non-exposed individuals in Rivers State.

1.4 Specific Objectives

The study seeks to:

1. Measure antioxidant enzyme levels (SOD, CAT, GSH) in traffic workers and controls.

2. Assess oxidative stress markers such as malondialdehyde (MDA).

3. Compare the biochemical results of exposed and non-exposed groups.

4. Evaluate lifestyle and occupational factors that influence oxidative stress.

5. Recommend preventive strategies that can protect traffic workers from oxidative damage.

1.5 Research Questions

1. Do traffic workers show lower antioxidant enzyme activity than non-exposed individuals?

2. Are oxidative stress markers significantly higher among exposed workers?

3. How do lifestyle habits affect oxidative balance in both groups?

4. What occupational factors contribute to the observed biochemical changes?

1.6 Research Hypotheses

• H₀: There is no significant difference in antioxidant status between traffic workers and non-exposed individuals.

• H₁: Traffic workers show significantly reduced antioxidant status compared to non-exposed individuals.

• H₀: There is no significant difference in oxidative stress markers between both groups.

• H₁: Traffic workers exhibit significantly higher oxidative stress markers than non-exposed individuals.

1.7 Significance of the Study

This study provides important biochemical evidence that shows how prolonged exposure to traffic fumes affects oxidative health. The results will help health agencies design better screening programs and protective policies. Additionally, the findings will guide traffic workers on lifestyle adjustments that can improve their antioxidant status. Researchers and policymakers can also use the data to advocate for air-quality improvement initiatives.

1.8 Scope of the Study

The study focuses on traffic workers in Rivers State and evaluates selected biochemical markers directly linked to oxidative stress. It compares their results with those of individuals who do not work in polluted outdoor environments. The scope covers laboratory analysis of antioxidant enzymes and oxidative markers, as well as the assessment of lifestyle factors.

1.9 Limitations of the Study

Some workers may not provide accurate lifestyle information, which may affect comparisons. In addition, seasonal variations in pollution levels can influence biochemical outcomes. Despite these constraints, the study offers relevant insights into occupational exposure and oxidative health risks.