Fat Burning Applied Techniques 4 — Questions and Answers
Question 1: What is the role of the enzyme hormone-sensitive lipase (HSL) in fat burning?
- It synthesizes new fat cells in adipose tissue
- It breaks down stored triglycerides into free fatty acids for use as fuel (lipolysis) (Correct answer)
- It transports fatty acids across the intestinal wall
- It converts glucose directly into adipose tissue
Correct answer: It breaks down stored triglycerides into free fatty acids for use as fuel (lipolysis)
HSL is the primary enzyme responsible for lipolysis — breaking down stored triglycerides into glycerol and free fatty acids that can be released into the bloodstream and oxidized.
Question 2: Which sleep-related behavior has the STRONGEST evidence for increasing fat mass and impairing fat loss?
- Sleeping more than 9 hours per night
- Consistently sleeping fewer than 6 hours per night (Correct answer)
- Taking afternoon naps of 20–30 minutes
- Sleeping in a room warmer than 68°F
Correct answer: Consistently sleeping fewer than 6 hours per night
Chronic sleep restriction elevates cortisol and ghrelin, suppresses leptin, and reduces insulin sensitivity, creating a hormonal environment that promotes fat storage and impairs fat oxidation.
Question 3: In the context of fat loss, what is 'spot reduction' and what does the research say about it?
- A proven technique where targeted exercises reduce fat in specific body areas
- The scientifically debunked idea that exercising a specific muscle burns the fat directly surrounding it (Correct answer)
- A surgical fat removal technique equivalent to liposuction
- A nutritional strategy that targets abdominal fat specifically
Correct answer: The scientifically debunked idea that exercising a specific muscle burns the fat directly surrounding it
Decades of research consistently shows that fat loss is systemic — your body draws from fat stores throughout the body, not preferentially from the area being exercised.
Question 4: Which cardiovascular training zone (approximate % of max heart rate) is sometimes called the 'fat-burning zone' and why is this label misleading?
- 90–100% MHR, because it burns the most total calories
- 60–70% MHR, because while fat is a larger proportion of fuel used, total caloric and fat expenditure is lower than at higher intensities (Correct answer)
- 40–50% MHR, because the body exclusively uses fat at very low intensities
- 80–90% MHR, because this intensity maximizes EPOC
Correct answer: 60–70% MHR, because while fat is a larger proportion of fuel used, total caloric and fat expenditure is lower than at higher intensities
The 60–70% MHR zone uses a higher fat percentage per calorie burned, but total fat calories burned are often less than at higher intensities due to lower overall energy expenditure.
Question 5: A trainer recommends 'active recovery' days between intense training sessions. How do these days contribute to fat loss?
- Active recovery days prevent any fat loss by allowing glycogen replenishment
- Light activity on recovery days adds to weekly caloric expenditure while promoting circulation and reducing fatigue without impeding recovery (Correct answer)
- Recovery days should always be completely sedentary to maximize fat loss
- Active recovery exclusively burns muscle glycogen and has no fat-burning benefit
Correct answer: Light activity on recovery days adds to weekly caloric expenditure while promoting circulation and reducing fatigue without impeding recovery
Low-intensity movement on recovery days burns additional calories, primarily from fat, and promotes recovery without causing further muscular damage.
Question 6: Which supplement has the MOST consistent research support for modestly enhancing fat oxidation during exercise?
- Raspberry ketones
- CLA (conjugated linoleic acid)
- Caffeine (Correct answer)
- Garcinia cambogia
Correct answer: Caffeine
Caffeine is the most well-researched ergogenic aid shown to increase lipolysis, spare muscle glycogen, and improve fat oxidation during exercise, particularly at moderate intensities.
Question 7: How does chronically elevated cortisol specifically impact fat distribution in the body?
- It causes preferential fat loss from the abdominal region
- It promotes fat storage in the abdominal (visceral) region and can lead to central obesity (Correct answer)
- It evenly distributes fat loss across all body regions
- It causes fat to migrate from the limbs to the back
Correct answer: It promotes fat storage in the abdominal (visceral) region and can lead to central obesity
Cortisol promotes visceral fat accumulation because visceral adipocytes have a high density of glucocorticoid receptors, making them particularly sensitive to cortisol's fat-storing effects.
Fat Burning Applied Techniques 4
What is the role of the enzyme hormone-sensitive lipase (HSL) in fat burning?