Overview

Athletes push themselves to extreme efforts to achieve peak performance and success. Though physical exertion is a significant component of athletic training, many symptoms, such as dizziness and excessive sweating, can impair performance and ultimately endanger health. Understanding the causes of these symptoms and the proper management strategies is crucial for both the athletes and supporting teams. This article explores the various factors that cause dizziness and excessive sweating in athletes, their treatment strategies and prevention methods.

Understanding dizziness in athletes

Dizziness is a nonspecific term that defines feelings of disturbed spatial orientation, instability, or even vertigo. In athletes, dizziness can be categorised into several types:¹

• Vertigo: A spinning sensation caused by problems in the inner ear or central vestibular pathways
• Presyncope: A feeling of lightheadedness or near fainting, often linked to cardiovascular conditions
• Imbalance: Difficulty in balancing without the spinning sensation

Causes 

Several causes for dizziness have been identified:^1,2,3

• Neurological injuries: Post-concussive dizziness is common with mild traumatic brain injuries (mTBI). It is typically characterised by a combination of central (brain) and peripheral (inner ear) vestibular dysfunction, leading to lengthy recovery periods if not treated appropriately. Often, there will be an evaluation of particular triggers and descriptors of dizziness to determine the cause, whether it is benign paroxysmal positional vertigo (BPPV), vestibular, central, or cervical in origin
• Vestibular disorders: Conditions such as BPPV and vestibular neuritis cause episodes of dizziness that impact athletic performance
• Cardiovascular factors: Dehydration, hypotension, or other heart diseases could cause presyncope or syncope at the onset of prolonged exercise

Evaluation and management

Dizziness in athletes should be evaluated extensively to exclude conditions that are life-threatening, such as brain injuries or heart abnormalities. Diagnostic procedures include the Dix-Hallpike manoeuvre for suspected peripheral vertigo and neuroimaging if a central cause is suspected.^1,2

Treatment and management range from rest to physiotherapy exercises or vestibular rehabilitation for BPPV, which are important for recovery and a safe return to sports.^1,2,3,4

In terms of cardiovascular-related conditions, orthostatic hypotension, or the sudden drop in blood pressure upon standing, may be responsible for dizziness, especially in endurance athletes. Good hydration and electrolyte balance are essential in avoiding this.^4,5

Athletes suffering from persistent dizziness should seek immediate medical evaluation so that they can participate in sports safely.

Understanding excessive sweating in athletes 

Excessive sweating, also known as hyperhidrosis, refers to excessive sweat production. In athletes, it is a thermoregulatory physiological response to physical effort. Excessive sweat may cause dehydration, loss of electrolytes, and decreased performance.^6,7

If the loss of body mass because of sweat exceeds 2-3%, it will have a negative impact on endurance and heat stress and increase the risk of exertional heat illness.⁸

Causes 

There are many causes of excessive sweating, or hyperhidrosis, in athletes. This is categorised into primary and secondary hyperhidrosis.

Primary hyperhidrosis is largely an inherited condition that affects areas of the body like the underarms, hands, feet, etc. It is not due to an underlying disease but instead is caused by overactive eccrine sweat glands. The condition often presents itself in children or adolescents and can be exacerbated by stress or heat.⁹

Secondary hyperhidrosis is a condition caused by some underlying disease or exogenous factor. Athletics-specific causes include:⁹

• Heat or dehydration: The body may attempt to cool itself by sweating during prolonged or intense exercise
• Endocrine disorders: Hyperthyroidism or diabetes, for example, can result in excessive sweating
• Neurological disorders: Overstimulation of the nerves can cause the sweat glands to work harder
• Medication side effects: Certain medications, including some antidepressants or beta-blockers, can cause excessive sweating.
• Psychological factors: Anxiety and stress that characterise aggressive competition are known to facilitate the action of sweat glands as a response to emotional stimuli

Now, if the sweat is severe and affects the athlete's performance or causes social embarrassment, treatment may include topical antiperspirants, iontophoresis, or botulinum toxin injections. Oral medication or procedures such as microwave thermolysis or sympathectomy are considered for more severe cases.⁹

Impact on athletic performance

Excessive sweating may result in:^6,7

• Dehydration: The decreased fluid volumes may impair cardiovascular function and temperature regulation and cause fatigue
• Electrolyte imbalance: The imbalance of sodium and potassium levels may result in muscle cramps and weakness, especially when fluids are replaced with only water 
• Skin problems: Excessive moisture raises the risk of chafing and infections

Management strategies

Hydration monitoring

Regularly evaluate fluid status through urine color, urine specific gravity, and changes in body mass during exercise. Prevent dehydration by limiting body mass loss to less than 2–4% during physical activity.¹⁰

Electrolyte balance

Add sodium-containing fluids during and post-exercise to replenish lost electrolytes through sweat. This is particularly vital when exercising in hot environments where sweat loss is greater.¹⁰

Clothing and equipment

Use lightweight, moisture-wicking fabrics to improve evaporation and cooling, and reduce the discomfort from excessive sweating.¹⁰

Cooling strategies

Use pre-cooling techniques such as wearing ice vests or cold-water immersion before exercise to lower core body temperature and delay the onset of excessive sweating.¹⁰

Acclimatisation

Gradual exposure to a hot environment enhances sweat effectiveness and reduces sodium concentration in sweat, thus minimising the risk of dehydration.^6,7

Personalised hydration

Personalised hydration strategies, beginning with optimal pre-exercise hydration and careful fluid balance during and after exercise, are considered essential in mitigating these effects.⁸

Medical interventions

Likewise, for pathological hyperhidrosis, therapeutic measures involving products like antiperspirants, iontophoresis and in some cases, botulinum toxin injections may become necessary.⁶

Excessive sweating is a common problem for any athlete, but it can be effectively managed using the right hydration and electrolyte replacement strategy. In addition to preventing decline in performance, it addresses the health risks posed by dehydration and heat-related illness conditions.^6,7

Case study

This is a synthesis of a case study based on scholarly articles addressing dizziness and excessive sweating in athletes.

Dizziness and excessive sweating at high intensity can severely affect performance as well as threaten the health of athletes. These symptom often arise due to dehydration, electrolyte imbalance, or overtraining in adverse environmental conditions.

Clinical presentation

A 25-year-old long-distance runner presents with recurrent episodes of dizziness and profuse sweating after events held in hot climates. Other symptoms include muscle cramps, lightheadedness, and fatigue, especially after prolonged performance.

Assessment and diagnosis

In this case, the following diagnosis was made:

• Dehydration: Occurs when fluid loss from sweating exceeds intake, leading to reduced blood volume, dizziness, fatigue, and heat-related illnesses
• Hyponatremia: Arises when sodium is lost through sweat, and so the body is suffering from electrolyte imbalance. Symptoms include dizziness, confusion, nausea and in severe cases, seizures
• Exercise-associated muscle cramps (EAMC) and dizziness: Are caused by a fluid and electrolyte imbalance that was increased due to the intensive demand of exercise and hot environment

Management strategy

Hydration plans were used where the intake of fluid and electrolytes lost through sweat was balanced to avoid conditions such as hyponatremia. Drinking to thirst rather than overhydration was an important recommendation to avoid overfluid dilution. Sodium levels were checked frequently and electrolyte supplementation was adjusted according to the sweat sodium concentration and intensity of the training session.

Training programs were adjusted to include acclimatisation periods in similar climates to enhance thermoregulation and reduce excessive sweating. Pre- and post-exercise stretching and rest periods were incorporated to alleviate muscle fatigue and lessen the chances of cramps.

Outcomes

The athlete showed significant improvement, experiencing fewer episodes of dizziness and consequently enhanced performance during competitions. Changes in training and hydration helped reduce excessive sweating and mitigate associated risks.¹¹

Summary

Managing dizziness or excessive sweating in athletes calls for a balanced approach to hydration and electrolyte balance, especially during prolonged or intense activity, to prevent dehydration or hyponatremia. Early warning signs such as fatigue or nausea should be closely monitored, with fluid intake adjusted according to environmental conditions and activity intensity. Implementing cooling strategies, including resting in shaded areas, can help regulate body temperature. Addressing underlying medical conditions and using individualised hydration plans are essential for optimising performance and safety of athletes.