TSAC-F exercise sciences, the body under load

Which heat mitigation strategy should a facilitator prioritize in a resource-limited outdoor training environment?

1. Procure personal cooling garments
   Personal cooling systems are expensive and need logistics support, which conflicts with the resource limits in the scenario.
2. Construct permanent shaded structures
   Permanent construction takes budget and time; rest-break shade can be improvised, but building structures is not the first move.
3. Install portable air conditioning
   Portable air conditioning needs power and equipment that a resource-limited field site lacks.
4. Administer intravenous rehydration fluids
   Intravenous fluids are a medical treatment given by clinicians, not a prevention measure for a training group.
5. Enforce strict work-rest schedules
   Work-rest cycles matched to the heat category cost nothing but supervision and directly cap heat build-up, so they come first when money and infrastructure are short.

A team deployed to moderate altitude reports subsiding acute mountain sickness symptoms after one week. How should the facilitator adjust the conditioning program moving forward?

1. Introduce maximal aerobic capacity testing first
   A maximal aerobic test this early measures altitude impairment more than fitness and adds heavy strain.
2. Incrementally progress both volume and intensity
   As symptoms settle, acclimatization is under way, so training load can climb gradually while the unit is watched for returning symptoms.
3. Exclusively program anaerobic alactic sprint work
   Dropping all aerobic work ignores the main quality altitude affects and leaves the program unbalanced.
4. Maintain a significantly reduced intensity profile
   Holding intensity down indefinitely wastes the acclimatization already gained and detrains the unit.
5. Immediately resume maximum sea-level intensity
   Jumping straight back to full intensity one week in invites a return of symptoms.

During an intensive summer training block, a squad exhibits a sudden drop in tactical decision-making accuracy. What is the MOST likely acute physiological cause?

1. Central nervous system desensitization
   Training does not 'desensitize' the nervous system within a block; this is not a recognized acute cause of poor decisions.
2. Chronic burnout from continuous operations
   Burnout develops over months and would not appear as a sudden drop tied to hot weather.
3. Delayed onset muscle soreness
   Muscle soreness affects movement comfort, not tactical decision accuracy.
4. Parasympathetic overcompensation
   Heat stress drives sympathetic activation, not a parasympathetic overshoot.
5. Early heat strain impairing cognition
   Rising core temperature degrades attention and decision-making before obvious collapse, so a sudden drop in judgment during hot training points to heat strain first.

An operator demonstrates an elite unloaded VO2max but performs poorly on a loaded tactical movement course. What is the MOST likely cause of this discrepancy?

1. Too little load-specific strength-endurance
   Carrying gear through a course needs muscular strength and endurance under load, which a high unloaded VO2max does not guarantee.
2. Inadequate baseline cardiovascular capacity
   An elite VO2max rules out a weak cardiovascular base.
3. Excessive oxidative enzyme concentrations
   High oxidative capacity supports endurance and is not a cause of failure.
4. An overdeveloped central nervous system drive
   High neural drive would help force production; it does not explain poor loaded performance.
5. Impaired absolute maximal sprint velocity
   Unloaded top speed has little to do with moving efficiently under heavy gear over a course.

Which of the following is most important for tactical athletes working in cold environments?

1. Limiting water intake to prevent cooling effects
   Dehydration still happens in the cold and impairs performance; restricting fluid gives no protection from cold.
2. Consuming extra protein to generate body heat
   Eating adds a little heat, but diet does not replace clothing that controls heat loss and moisture.
3. Proper layering of moisture-wicking fabrics
   Layers trap air and can be removed as work rate changes, while wicking fabric moves sweat off the skin so clothing stays dry and insulating.
4. Wearing a single thick layer of insulation
   One thick layer cannot be adjusted, so the wearer overheats and sweats during work and then chills when work stops.

How does adding 40 pounds of occupational gear primarily alter the metabolic demands of a steady-state aerobic ruck march?

1. Increases reliance on lipid oxidation pathways
   Fat's share of fuel falls as relative intensity rises, so added load shifts away from lipid oxidation.
2. Enhances phosphagen system recovery rates
   Phosphagen recovery matters between short maximal efforts, not during a steady march.
3. Decreases Type II muscle fiber recruitment
   Heavier loads recruit more motor units, including more Type II fibers, not fewer.
4. Raises relative intensity and carbohydrate use
   At the same pace the extra mass raises oxygen cost, so the march sits at a higher fraction of VO2max and leans more on carbohydrate, though it usually stays mainly aerobic.
5. Reduces overall blood lactate accumulation
   A higher relative intensity tends to raise blood lactate, not lower it.

An 85 kg operator expends 7.0 kcal/min rucking unloaded at a brisk pace. Assuming energy cost rises in proportion to the total mass moved, what is the estimated expenditure at the same pace with a 25 kg ruck?

1. 2.06 kcal/min
   This is only the share attributable to the ruck (7.0 x 25 / 85), not the new total cost.
2. 7.00 kcal/min
   Holding the cost constant ignores that moving more mass at the same pace takes more energy.
3. 8.75 kcal/min
   Adding 25 % treats the ruck as a quarter of body mass; 25 kg is about 29 % of 85 kg.
4. 5.41 kcal/min
   This divides by the new mass instead of multiplying (7.0 x 85 / 110), so it predicts a drop in cost.
5. 9.06 kcal/min
   Total mass rises from 85 to 110 kg, so 7.0 x 110 / 85 = 9.06 kcal/min.

A squad will do moderate work in heavy CBRN protective clothing (JSLIST). Under the Army's heat-stress bulletin TB MED 507 (2022), how should the measured WBGT be adjusted before reading the work/rest table?

1. Add 5 °F
   A 5 °F correction understates how much an encapsulating suit cuts heat loss during moderate work.
2. Add 20 °F
   For moderate and heavy work in heavy protective clothing, TB MED 507 adds 20 °F to the WBGT index because the suit blocks evaporative cooling.
3. Add 10 °F
   Adding 10 °F is the correction for easy work in the same clothing, not moderate work.
4. Use it unchanged
   The instrument reading ignores clothing that traps heat, so using it unchanged underestimates the heat category.

Army heat guidance (TB MED 507) caps fluid intake at 1.5 quarts per hour and 12 quarts per day during heat work. What is the main reason for the cap?

1. Field water supplies would run short
   Logistics matter, but the cap is a health safeguard against overdrinking, not a rationing rule.
2. Extra fluid suppresses the sweat rate
   Adequate fluid supports sweating; it does not suppress it.
3. Cold water triggers stomach cramps
   Cool water is fine during heat work; cramping is not the reason for the limit.
4. Overdrinking can dilute blood sodium
   Drinking well beyond sweat losses for hours without replacing salt can cause hyponatremia, and the stomach empties less than about 1.5 quarts an hour.

During a hot-weather road march, the first member of a platoon is treated for heat illness. According to TB MED 507, what should leaders assume about the rest of the platoon?

1. Others may soon develop heat illness too
   Heat casualties tend to occur in clusters because the whole group shares the same heat, workload and clothing, so the first case is a warning for everyone.
2. The others are protected by acclimatization
   Being in the same heat does not make the rest of the platoon acclimatized; one casualty signals shared risk.
3. It most likely reflects one member's health
   Individual factors matter, but the group shares the exposure that produced the first case.
4. Risk falls once the hottest hour has passed
   Heat risk does not end with the hottest hour, so the rest of the platoon is still exposed.

Research on an 8-week U.S. Army Ranger course with chronic energy deficit and sleep loss measured hormones before and after the course. Which pattern was reported at the end?

1. Testosterone, IGF-I and cortisol all rose
   The anabolic hormones fell under prolonged deficit, so they did not rise with the training load.
2. Testosterone and IGF-I fell; cortisol rose
   Prolonged energy deficit and sleep loss suppressed anabolic hormones, with testosterone dropping to hypogonadal levels, while cortisol rose.
3. Testosterone rose; cortisol and IGF-I fell
   Testosterone fell under the severe deficit, and cortisol went up rather than down.
4. Testosterone, IGF-I and cortisol all fell
   Cortisol increased; only the anabolic hormones fell.

A ruck route moves from paved road onto loose sand at the same speed and load. In the Pandolf load-carriage equation, how does the terrain factor for loose sand compare with paved road?

1. About 1.5 times higher
   About 1.5 is the factor for heavy brush; sand costs more.
2. The same at that speed
   Terrain changes energy cost even at a fixed speed and load, because a soft surface absorbs work with each step.
3. About 1.1 times higher
   About 1.1 is the factor for a dirt road, not loose sand.
4. About 2.1 times higher
   Loose sand carries a terrain factor of about 2.1 against 1.0 for blacktop, so the speed-dependent part of the energy cost roughly doubles.

A unit staging above 3,000 m will gain more altitude each day. Under the Wilderness Medical Society's 2024 guidelines, which variable is most important to limit to prevent acute mountain sickness?

1. Highest point reached during day patrols
   Going high during the day and sleeping lower is acceptable; sleeping altitude drives risk.
2. Total distance marched each day
   Distance affects fatigue, but ascent rate, not mileage, is the main risk factor for altitude illness.
3. Daily increase in sleeping elevation
   Above 3,000 m the guidelines limit the rise in sleeping elevation to about 500 m per day, with a rest day every 3-4 days; where people sleep matters more than how high they go during the day.
4. Heart rate during daily training
   Heart rate guides intensity, but it is not the variable that prevents altitude illness.

Wildfire smoke pushes the local Air Quality Index into the 'Unhealthy' range (151-200) on a scheduled outdoor PT day. Following EPA AirNow guidance, what is the most appropriate change?

1. Add cloth masks and keep the plan
   Cloth masks do little against fine smoke particles, so they do not make the original plan safe.
2. Add longer runs to build tolerance
   There is no tolerance to build against smoke; longer runs increase the inhaled dose.
3. Move or shorten the hard outdoor work
   At 'Unhealthy' AQI, everyone should reduce prolonged or heavy outdoor exertion, so the hard work moves indoors, gets shortened or is rescheduled.
4. Run the session as planned outdoors
   Heavy breathing during hard exercise raises the dose of fine smoke particles, so the plan should change.

Soldiers who are not heat-acclimated work at the same activity level in 86-104 °F heat. According to FM 7-22, how do their energy needs change?

1. Rise by about 2.5-10 percent
   Extra work to maintain thermal balance raises energy intake needs by roughly 2.5-10 percent unless activity is reduced; heat-acclimated individuals likely see no increase.
2. Fall by about 2.5-5 percent
   Energy needs go up slightly in the heat, not down, so any fall is the wrong direction.
3. Rise by about 25-50 percent
   A 25-50 percent rise overstates the modest extra cost of thermoregulation.
4. Rise by about 50-100 percent
   Doubling energy needs would far exceed the small cost the manual describes.