4.1 Using research, analyse the dietary requirements, pre, during and post performance needed and fluid intake requirements of athletes from different sports
About the dot point
Athletic performance depends on how well the body can supply energy, maintain fluid balance, and repair and adapt after training and competition. Different sports place different demands on the body, so athletes need the right balance of energy availability, carbohydrate, protein, fat, and key micronutrients to support glycogen storage, stable blood glucose, muscle repair, and ongoing training quality. These needs also shift across the phases of performance because what limits output before an event (for example, starting with low glycogen), during an event (for example, falling blood glucose or rising dehydration strain), and after an event (for example, incomplete refuelling or unresolved muscle damage) is not always the same.
How to approach it
Because the directive verb is analyse, you must break sports nutrition into its key parts and show how they connect, then explain what those connections mean for performance. This means identifying the main demands of each sport and linking them to specific pre-performance, during performance, and post-performance dietary strategies and fluid intake requirements, then drawing out the implications for likely performance limiters such as glycogen depletion, thermoregulation under heat strain, gastrointestinal tolerance, and recovery speed when athletes must perform again soon.
1. Foundation of sports nutrition
Across sports, dietary requirements have the same foundation, but different emphasis:
- Energy availability (enough intake to cover training demands and normal body function) underpins adaptation and recovery. Chronic under-fuelling reduces training quality and slows improvement, particularly in adolescents.
- Carbohydrate is the key fuel for high-intensity work and longer events because it protects glycogen stores. Daily needs change with training load, commonly scaling from 3 to 5 g per kg per day (lighter training), to 6 to 10 g per kg per day (endurance training), and up to 8 to 12 g per kg per day (extreme endurance periods).
- Protein supports repair and adaptation. A practical pattern is 3 to 5 protein-containing eating occasions, targeting about 0.3 to 0.4 g per kg per meal, with a daily range commonly around 1.2 to 1.7 g per kg per day. Post-training, 15 to 25 g of high-quality protein supports muscle protein synthesis.
- Fat is essential, but high-fat choices close to intense exercise can increase gastrointestinal discomfort because fat slows stomach emptying.
- Key micronutrients can limit performance when intake is low, particularly iron, calcium, vitamin D, and B-group vitamins, because they support oxygen transport, bone strength, muscle function, and energy metabolism.
2. Pre-performance
Pre-performance strategies aim to start with adequate glycogen, stable blood glucose, and effective hydration, without gastrointestinal discomfort. The analysis is how the sport’s demands change the priority. For example, a marathon runner needs a strong carbohydrate base and gut tolerance, while a 100 m sprinter prioritises feeling light and comfortable.
A research-informed pre-performance pattern is:
- A larger, familiar meal about 3 to 4 hours before competition, emphasising carbohydrate and keeping fat and fibre lower to reduce gut upset.
- A smaller carbohydrate top-up closer to the start when needed, chosen for easy digestion and practicality.
- Hydration aimed at beginning exercise euhydrated (optimal level of water content in the body), using about 5 to 7 mL per kg of fluid at least 4 hours before exercise, allowing time for absorption and normal urine output.
Food type can be adjusted using GI (glycaemic index). Earlier meals often suit moderate or lower GI choices for steadier energy, while closer to the start some athletes prefer higher GI options that digest quickly and raise blood glucose faster.
3. During performance
During performance, nutrition and hydration matter when the event is long enough for falling blood glucose, declining glycogen, or rising dehydration strain to reduce output. The analysis is whether the sport’s duration and structure allow intake, and whether the athlete can tolerate it at intensity.
Research-informed carbohydrate intake is commonly linked to duration:
- For about 60 to 120 minutes, many athletes benefit from around 30 to 60 g per hour, often taken during breaks in team sports or at aid stations in endurance events.
- For longer events, intakes can rise, and in very long events trained athletes may tolerate up to 90 g per hour, often using mixed carbohydrate sources to increase absorption and reduce gut distress.
An advanced tactic for events around 30 to 60 minutes is carbohydrate mouth rinsing, where carbohydrate exposure in the mouth may reduce perceived effort without full ingestion. This is a minor strategy and does not replace adequate pre-performance fuelling.
4. Post-performance
Post-performance strategies aim to restore the resources that limit the next session: glycogen, muscle repair capacity, and fluid and electrolyte balance. The urgency depends on how quickly the athlete must perform again. For example, a tournament schedule increases the priority of rapid refuel and rehydrate compared with a single weekly event.
Research-informed recovery priorities include:
- Refuel: replenish glycogen using carbohydrate, especially when recovery time is short. Higher GI carbohydrate options can speed early glycogen restoration when rapid recovery is needed.
- Repair: consume 15 to 25 g of high-quality protein after training or competition to support muscle protein synthesis, then continue protein across the day using 3 to 5 eating occasions at about 0.3 to 0.4 g per kg per meal.
- A proactive recovery window of roughly 8 to 12 hours after performance is often where athletes either restore readiness or accumulate fatigue for the next day.
5. Fluid intake
Fluid intake requirements vary more than most athletes expect because they depend on sweat rate, environment, clothing, intensity, and access to fluids. The analysis is to match intake to likely losses and to avoid the two major errors: too little fluid and too much fluid.
Research-informed hydration principles commonly include:
- Aim to limit dehydration to less than about 2% of body mass, because dehydration increases cardiovascular strain and impairs thermoregulation and concentration.
- A practical starting point is 200 to 300 mL every 15 to 20 minutes, then adjust based on sport structure, conditions, and individual response.
- In longer or hotter sessions, electrolytes, especially sodium, become more important because sweat contains sodium. A commonly used sodium range for sports fluids is about 0.5 to 0.7 g per litre (about 21 to 30 mmol per litre) when electrolyte replacement is needed.
- Avoid hyponatraemia (low blood sodium) by not over-drinking, particularly water, relative to sweat losses. Hyponatraemia is most likely in long-duration events when athletes drink excessively. Adding sodium does not fix the core problem if over-drinking continues.
Post-exercise rehydration can be planned using body mass change. A common guide is about 1.25 to 1.5 litres per kilogram of body mass lost, accounting for ongoing urine losses, with sodium included through food or drinks to improve fluid retention.
Example: A 90-minute AFL match in western Sydney on a humid 32°C day creates a different hydration problem from a 90-minute AFL match on a cool, windy night. In the hot match, sweat losses can be much higher, so the athlete may need more sodium-containing fluids during breaks to support performance and reduce heat strain. In the cool match, the same athlete may drink less, but still needs to protect concentration and late-game running.
6. Requirements change with sport demands
The information below applies these principles to seven different sports, showing how pre-performance, during performance, post-performance, and fluid strategies change with sport demands.
6.1 Marathon running (42.2 km)
- Long duration, steady to high intensity.
- Predominant energy system: aerobic (with rising glycolytic demand at faster paces).
- Main limiters: glycogen depletion, dehydration, heat strain, gut tolerance.
|
Pre-performance |
During performance |
Post-performance |
|---|---|---|
|
Carbohydrate-focused meal 3 to 4 hours prior, low fat and fibre to reduce gut upset. Fluids: water sipped through the morning. If hot, an electrolyte drink with breakfast. |
Regular carbohydrate and fluid intake is needed during the race to delay fatigue and maintain pace. |
Early recovery should replace carbohydrate, fluid and sodium losses while also providing protein for muscle repair. |
|
Example: Porridge with banana and honey, plus white toast with jam. |
Example: 1 gel every 30 to 45 minutes with water. Alternate with sports drink at aid stations. |
Example: Low-fat flavoured milk plus a banana soon after, then a chicken and rice bowl later. Fluids: water plus electrolytes until urine is pale. |
|
Why: Maximises starting glycogen and hydration while reducing stomach discomfort, supporting a stable early pace. |
Why: Maintains blood glucose, slows glycogen depletion, and supports thermoregulation by protecting blood volume and sweat rate. |
Why: Restores glycogen, supports muscle protein synthesis, and replaces fluid and sodium losses to protect next-day training quality. |
Fluid intake requirements
- Sweat losses continue for hours, so the plan must balance dehydration and over-drinking.
- Regular small sips are more effective than large volumes.
- Sodium becomes more important when sessions are long or hot.
6.2 Triathlon (Olympic distance)
- Prolonged duration with intensity changes.
- Predominant energy system: aerobic with frequent glycolytic surges.
- Main limiters: glycogen, access to fuel, heat strain, gut tolerance (especially on the run).
|
Pre-performance |
During performance |
Post-performance |
|---|---|---|
|
Pre-performance nutrition should prioritise carbohydrate availability, hydration and gut comfort before the swim begins. |
Fuelling is usually most practical on the bike, while the run requires smaller, more tolerable intake. |
Recovery should restore glycogen, fluid and electrolytes after prolonged work across three movement demands. |
|
Example: White rice with eggs and a small yoghurt 3 hours prior. 30 minutes prior, banana and water. Consider electrolytes if humid. |
Example: On the bike, sip sports drink plus 1 gel. On the run, water at stations and a gel if tolerated. |
Example: Tuna salad sandwich on white bread plus fruit, or a milk-based smoothie with oats. Fluids include electrolyte drink, then water. |
|
Why: Increases pre-event carbohydrate availability and supports repeated surges. |
Why: Maintains blood glucose while reducing gut load during running, protecting pace late in the event. |
Why: Refills glycogen, supports repair from prolonged running, and restores hydration for the next day. |
Fluid intake requirements
- Access differs by leg, so planning is essential.
- Heat increases sweat losses across the whole event.
- Electrolyte-containing fluids reduce over-reliance on water alone.
6.3 Rugby league
- Intermittent high-intensity, contact, repeated accelerations and tackles.
- Predominant energy systems: mixed aerobic and glycolytic, with repeated ATP-PCr bursts.
- Main limiters: glycogen, dehydration, collision-related muscle damage.
|
Pre-performance |
During performance |
Post-performance |
|---|---|---|
|
Pre-performance intake should provide enough carbohydrate for repeated high-intensity efforts without causing heaviness during contact and running. |
During the match, intake must fit around breaks, half-time and interchange opportunities. |
Recovery should focus on replacing glycogen, repairing muscle damage from collisions and restoring hydration. |
|
Example: Pasta with lean mince and tomato sauce 3 to 4 hours prior. 60 minutes prior, low-fibre muesli bar and water. |
Example: Half-time sports drink plus orange slices. Quick water sips when interchanged. |
Example: Chicken wrap and yoghurt, or protein shake plus banana soon after, then a balanced dinner later. |
|
Why: Supports glycogen for repeated efforts and reduces gut discomfort that limits running involvement. |
Why: Protects late-game running and decision-making by supporting blood glucose and hydration. |
Why: Restores glycogen, supports repair after collisions, and rehydrates to reduce next-session fatigue. |
Fluid intake requirements
- Break-based drinking is essential.
- Sweat losses rise in heat and in kit.
- Electrolytes support fluid retention and help avoid excessive water-only intake over long exposure.
6.4 Netball
- Intermittent, high-intensity accelerations, jumps, rapid decelerations.
- Predominant energy systems: mixed aerobic and glycolytic, with repeated ATP-PCr efforts.
- Main limiters: repeated sprint ability, concentration, dehydration.
|
Pre-performance |
During performance |
Post-performance |
|---|---|---|
|
Pre-performance intake should support repeated accelerations, jumping and concentration without causing stomach discomfort. |
During performance, fluid and small amounts of carbohydrate should be timed around quarter breaks and half-time. |
Recovery should replace glycogen, support muscle repair and restore fluid lost through repeated high-intensity movement. |
|
Example: Chicken and rice bowl 3 hours prior. 30 to 60 minutes prior, banana or half a jam sandwich plus water. |
Example: Water in quarter breaks. Half-time sports drink and a few jelly lollies if intensity is high. |
Example: Flavoured milk and a ham roll, or Greek yoghurt with fruit and cereal. |
|
Why: Supports glycogen for repeated accelerations and protects concentration late in the match. |
Why: Maintains hydration and blood glucose without overfilling the stomach, supporting speed and shooting accuracy under fatigue. |
Why: Replenishes glycogen, supports repair from repeated jumping and landing, and restores hydration. |
Fluid intake requirements
- Indoor heat and limited airflow can increase sweat losses.
- Small, frequent sips reduce discomfort and help maintain concentration.
6.5 100 m sprint
- Very short duration, maximal intensity.
- Predominant energy system: ATP-PCr.
- Main limiters: neuromuscular readiness, technique, avoiding gastrointestinal heaviness.
|
Pre-performance |
During performance |
Post-performance |
|---|---|---|
|
Pre-performance intake should be light, familiar and timed to support warm-up without creating gastrointestinal heaviness. |
During the race, the priority is comfort and focus rather than fuelling. |
Recovery should support muscle repair and restore energy for later rounds, training or competition demands. |
|
Example: Toast with honey and a small yoghurt 2 to 3 hours prior. A few sips of water close to start. |
Example: No fuelling during the race. Small water sips between rounds only. |
Example: Protein shake in milk plus banana, then a balanced meal later such as beef stir-fry with rice. |
|
Why: Fuels warm-up and possible repeat rounds while keeping the athlete light and free from gut discomfort that distracts technique. |
Why: Maintains comfort and focus and avoids stomach “sloshing” that can affect explosiveness. |
Why: Supports repair and restores energy for later training sessions. |
Fluid intake requirements
- Fluid needs during the event are minimal due to short duration.
- Priority is starting euhydrated without excessive fluid volume.
6.6 Olympic weightlifting
- Short maximal efforts with rest between lifts.
- Predominant energy system: ATP-PCr per lift, with glycolytic contribution across sets.
- Main limiters: power output, technique, recovery from heavy loading.
|
Pre-performance |
During performance |
Post-performance |
|---|---|---|
|
Pre-performance intake should support power output and concentration while avoiding nausea during heavy lifting. |
During performance, intake should maintain hydration and focus without interfering with bracing, technique or lifting comfort. |
Recovery should provide protein for adaptation and carbohydrate to restore energy across the training week. |
|
Example: Chicken and white rice 2 to 3 hours prior. 30 to 60 minutes prior, banana or rice cakes with jam plus water. |
Example: Small water sips between attempts. If session is long, sip diluted sports drink. |
Example: Tuna and rice bowl, or yoghurt with fruit plus whey shake. |
|
Why: Supports training output and reduces nausea risk during heavy lifts. |
Why: Maintains concentration and technique and supports blood glucose across a long session without gut discomfort. |
Why: Supports adaptation and restores energy across the training week. |
Fluid intake requirements
- Sweat loss is often moderate but rises in hot gyms.
- Fluid is guided by thirst and session length, electrolytes are most useful when heat and sweat are significant.
6.7 One-day cricket
- Long duration, variable intensity, prolonged concentration, heat and sun exposure.
- Predominant energy systems: mostly aerobic, with short ATP-PCr and glycolytic bursts.
- Main limiters: dehydration, heat strain, concentration, cumulative fatigue.
|
Pre-performance |
During performance |
Post-performance |
|---|---|---|
|
Pre-performance intake should stabilise blood glucose, support hydration and prepare the athlete for long heat exposure. |
During performance, regular fluid and food intake should match long playing time, breaks and exposure to heat. |
Recovery should replace fluid, sodium and energy after prolonged intermittent activity in the sun. |
|
Example: Oats with fruit and yoghurt for breakfast. Pre-start Vegemite sandwich on white bread plus water. |
Example: Drinks break sports drink plus banana. Lunch chicken salad roll and fruit. Water sips between overs. |
Example: Rice with lean meat and vegetables, or a large smoothie with milk, banana, and oats plus yoghurt. |
|
Why: Stabilises blood glucose and reduces early dehydration risk under sun exposure. |
Why: Maintains hydration and concentration across the day and supports repeated sprint efforts when fielding. |
Why: Restores hydration and sodium balance and supports recovery for subsequent training days. |
Fluid intake requirements
- Heat can drive large sweat losses even with intermittent movement.
- Frequent opportunities allow steady intake.
- Electrolytes help when sweating is heavy, while avoiding excessive water-only intake.
Brief Summary
About the dot point and how to approach it
- Athletic performance depends on energy supply, maintaining fluid balance, and repair and adaptation after training and competition.
- Different sports place different demands on the body, so dietary requirements shift across pre-performance, during performance, and post-performance phases and fluid intake requirements.
- Because the directive verb is analyse, break sports nutrition into key parts, show how they connect, then explain what those connections mean for performance.
1. Foundation of sports nutrition
- Energy availability underpins adaptation and recovery; chronic under-fuelling reduces training quality and slows improvement.
- Carbohydrate is the key fuel for high-intensity work and longer events; needs scale from 3 to 5 g per kg per day to 6 to 10 g per kg per day and up to 8 to 12 g per kg per day.
- Protein supports repair and adaptation: 1.2 to 1.7 g per kg per day, spread across 3 to 5 eating occasions.
- Key micronutrients: iron, calcium, vitamin D, and B-group vitamins.
2. Pre-performance
- Start with adequate glycogen, stable blood glucose, and begin exercise euhydrated (optimal level of water content in the body).
- Meal about 3 to 4 hours before: emphasise carbohydrate and keep fat and fibre lower.
- Hydration: about 5 to 7 mL per kg at least 4 hours before exercise.
3. During performance
- Intake matters when falling blood glucose, declining glycogen, or rising dehydration strain reduce output; effectiveness depends on whether the sport allows intake and the athlete can tolerate it.
- For about 60 to 120 minutes: 30 to 60 g per hour carbohydrate.
- For longer events: up to 90 g per hour (mixed carbohydrate sources).
4. Post-performance
- Priorities: restore glycogen, support repair, and restore fluid and electrolyte balance.
- Refuel: carbohydrate to replenish glycogen (higher GI options when rapid recovery is needed).
- Repair: 15 to 25 g high-quality protein after training or competition, then protein across the day.
5. Fluid intake
- Match intake to sweat losses and avoid both too little and too much fluid.
- Aim to limit dehydration to less than about 2% of body mass.
- Electrolytes, especially sodium, matter in longer or hotter sessions; a commonly used range is about 0.5 to 0.7 g per litre.
- Avoid hyponatraemia by not over-drinking relative to sweat losses.
6. Requirements change with sport demands
- Marathon running (42.2 km):
Pre-performance Carbohydrate-focused meal 3 to 4 hours prior, low fat and fibre; During performance regular carbohydrate and fluid intake; Post-performance replace carbohydrate, fluid and sodium losses and provide protein; Fluid intake requirements regular small sips and sodium when long or hot. - Triathlon (Olympic distance):
Pre-performance prioritise carbohydrate availability, hydration and gut comfort; During performance fuel mainly on the bike, smaller intake on the run; Post-performance restore glycogen, fluid and electrolytes; Fluid intake requirements plan access by leg and use electrolyte-containing fluids in heat. - Rugby league (80 minutes):
Pre-performance enough carbohydrate without heaviness; During performance intake around breaks, half-time and interchange; Post-performance replace glycogen, repair collision-related muscle damage and restore hydration; Fluid intake requirements break-based drinking and electrolytes when sweating is high. - Netball (60 minutes):
Pre-performance support repeated accelerations, jumping and concentration without discomfort; During performance fluid and small carbohydrate around quarter breaks and half-time; Post-performance replace glycogen, support repair and restore fluid; Fluid intake requirements small, frequent sips (indoor heat can increase sweat losses). - 100 m sprint:
Pre-performance light, familiar and timed to support warm-up; During performance comfort and focus rather than fuelling; Post-performance support muscle repair and restore energy for later rounds; Fluid intake requirements start euhydrated without excessive volume. - Olympic weightlifting:
Pre-performance support power output and concentration while avoiding nausea; During performance maintain hydration and focus without interfering with bracing or technique; Post-performance provide protein and carbohydrate to restore energy; Fluid intake requirements guided by thirst and session length, electrolytes most useful with heat and sweat. - One-day cricket (50 overs):
Pre-performance stabilise blood glucose and support hydration for long heat exposure; During performance regular fluid and food matched to long playing time and breaks; Post-performance replace fluid, sodium and energy; Fluid intake requirements steady intake with electrolytes when sweating is heavy and avoid excessive water-only intake.