hce_cmu
115年
英文
第 48 題
📖 題組：
Obesity has become a major public-health concern among young adults because it is associated not only with excess body weight but also with abnormal blood lipid profiles, metabolic dysregulation, and long-term cardiovascular risk. College students are a particularly important group because this period is often when lifelong exercise habits are formed, yet academic pressure, sedentary routines, irregular sleep, and unhealthy diets may increase obesity-related risks. One study compared two exercise strategies for college students with obesity: high-intensity interval training (HIIT) and moderate-intensity continuous training (MICT). HIIT alternates demanding exercise with lower-intensity recovery periods, whereas MICT maintains a steadier aerobic intensity for a longer continuous period. Although both approaches are widely used for weight control and cardiovascular fitness, the researchers noted that direct comparisons in obese college students, especially with attention to sex-based differences and biochemical indicators, remained limited. The purpose of the study was to examine whether HIIT and MICT differ in their effects on weight, body composition, lipid profiles, and metabolic health. Forty college students aged 18 to 25 with obesity were included in the final analysis, with equal numbers of men and women. Participants were randomly assigned to a HIIT or MICT group, and each group was further divided into male and female subgroups. The intervention lasted eight weeks, with three treadmill-based sessions at night per week on nonconsecutive days. The MICT group performed 35 minutes of continuous aerobic exercise at 60-70% of maximum heart rate. The HIIT group completed a shorter 28-minute session consisting of four cycles: four minutes at 85-90% of maximum heart rate followed by three minutes of recovery at 50-60%. Heart-rate monitors and ratings of perceived exertion were used to check training intensity. To make the comparison fairer, the researchers estimated oxygen consumption so that the two exercise protocols involved similar energy expenditure. Participants were also asked to maintain their usual diet and daily routines, although formal food diaries were not used. The researchers assessed changes in body morphology, body composition, and biochemical markers before and after the intervention. Body-related measurements included weight, body mass index (BMI), body fat percentage (BF%), waist circumference, hip circumference, and waist-to-hip ratio. Biochemical measurements included total cholesterol (TC), triglycerides (TG), low-density lipoprotein cholesterol (LDL-C), high-density lipoprotein cholesterol (HDL-C), alanine aminotransferase (ALT), and uric acid (UA). These markers were important because obesity is often accompanied by dyslipidemia, which refers to an abnormal lipid profile marked by elevated TC, TG, and LDL-C and reduced HDL-C. ALT is relevant because elevated values may be associated with obesity, metabolic syndrome, and liver-related metabolic stress, while UA reflects purine metabolism and renal function. The findings showed that both HIIT and MICT produced beneficial changes after eight weeks. Participants in both groups generally reduced weight, BMI, waist and hip measurements, waist-to-hip ratio, and BF%. However, HIIT produced a more favorable decline in body fat than MICT. Reductions in BF% were larger in the HIIT subgroups than in the MICT subgroups, with female HIIT participants showing the greatest proportional decrease. The study also found that improvements in body-related indicators tended to be larger during the first four weeks than during the second four weeks, suggesting that early adaptation to exercise may be especially visible before progress gradually stabilizes. Despite these improvements, participants’ waist-to-hip ratios still remained above normal Asian reference levels, indicating that central obesity was not fully resolved within eight weeks. Biochemical results also favored HIIT in several respects. Both exercise programs improved lipid-related indicators, but HIIT was especially effective in reducing TG in both men and women. Male HIIT participants also showed a larger reduction in LDL-C than male MICT participants. HDL-C increased after training, while TC, TG, LDL-C, ALT, and UA generally decreased. The researchers suggested several mechanisms for HIIT’s stronger effects, including greater excess post-exercise oxygen consumption, increased fat oxidation, and stronger hormonal responses involving catecholamines and growth hormone. These mechanisms may allow HIIT to create meaningful metabolic benefits in less exercise time than MICT. The study contributes evidence that HIIT may be a time-efficient intervention for improving body composition and selected metabolic markers in obese college students. It also highlights the value of examining sex-based differences and multiple health indicators rather than relying on body weight alone. Nevertheless, the researchers acknowledged several limitations. The study did not include a non-exercise control group, did not use rigorous dietary records such as 24-hour recalls, and involved a relatively small sample. Future research should include better dietary monitoring, longer follow-up periods, and a control group to clarify whether HIIT’s advantages persist over time.
Obesity has become a major public-health concern among young adults because it is associated not only with excess body weight but also with abnormal blood lipid profiles, metabolic dysregulation, and long-term cardiovascular risk. College students are a particularly important group because this period is often when lifelong exercise habits are formed, yet academic pressure, sedentary routines, irregular sleep, and unhealthy diets may increase obesity-related risks. One study compared two exercise strategies for college students with obesity: high-intensity interval training (HIIT) and moderate-intensity continuous training (MICT). HIIT alternates demanding exercise with lower-intensity recovery periods, whereas MICT maintains a steadier aerobic intensity for a longer continuous period. Although both approaches are widely used for weight control and cardiovascular fitness, the researchers noted that direct comparisons in obese college students, especially with attention to sex-based differences and biochemical indicators, remained limited. The purpose of the study was to examine whether HIIT and MICT differ in their effects on weight, body composition, lipid profiles, and metabolic health. Forty college students aged 18 to 25 with obesity were included in the final analysis, with equal numbers of men and women. Participants were randomly assigned to a HIIT or MICT group, and each group was further divided into male and female subgroups. The intervention lasted eight weeks, with three treadmill-based sessions at night per week on nonconsecutive days. The MICT group performed 35 minutes of continuous aerobic exercise at 60-70% of maximum heart rate. The HIIT group completed a shorter 28-minute session consisting of four cycles: four minutes at 85-90% of maximum heart rate followed by three minutes of recovery at 50-60%. Heart-rate monitors and ratings of perceived exertion were used to check training intensity. To make the comparison fairer, the researchers estimated oxygen consumption so that the two exercise protocols involved similar energy expenditure. Participants were also asked to maintain their usual diet and daily routines, although formal food diaries were not used. The researchers assessed changes in body morphology, body composition, and biochemical markers before and after the intervention. Body-related measurements included weight, body mass index (BMI), body fat percentage (BF%), waist circumference, hip circumference, and waist-to-hip ratio. Biochemical measurements included total cholesterol (TC), triglycerides (TG), low-density lipoprotein cholesterol (LDL-C), high-density lipoprotein cholesterol (HDL-C), alanine aminotransferase (ALT), and uric acid (UA). These markers were important because obesity is often accompanied by dyslipidemia, which refers to an abnormal lipid profile marked by elevated TC, TG, and LDL-C and reduced HDL-C. ALT is relevant because elevated values may be associated with obesity, metabolic syndrome, and liver-related metabolic stress, while UA reflects purine metabolism and renal function. The findings showed that both HIIT and MICT produced beneficial changes after eight weeks. Participants in both groups generally reduced weight, BMI, waist and hip measurements, waist-to-hip ratio, and BF%. However, HIIT produced a more favorable decline in body fat than MICT. Reductions in BF% were larger in the HIIT subgroups than in the MICT subgroups, with female HIIT participants showing the greatest proportional decrease. The study also found that improvements in body-related indicators tended to be larger during the first four weeks than during the second four weeks, suggesting that early adaptation to exercise may be especially visible before progress gradually stabilizes. Despite these improvements, participants’ waist-to-hip ratios still remained above normal Asian reference levels, indicating that central obesity was not fully resolved within eight weeks. Biochemical results also favored HIIT in several respects. Both exercise programs improved lipid-related indicators, but HIIT was especially effective in reducing TG in both men and women. Male HIIT participants also showed a larger reduction in LDL-C than male MICT participants. HDL-C increased after training, while TC, TG, LDL-C, ALT, and UA generally decreased. The researchers suggested several mechanisms for HIIT’s stronger effects, including greater excess post-exercise oxygen consumption, increased fat oxidation, and stronger hormonal responses involving catecholamines and growth hormone. These mechanisms may allow HIIT to create meaningful metabolic benefits in less exercise time than MICT. The study contributes evidence that HIIT may be a time-efficient intervention for improving body composition and selected metabolic markers in obese college students. It also highlights the value of examining sex-based differences and multiple health indicators rather than relying on body weight alone. Nevertheless, the researchers acknowledged several limitations. The study did not include a non-exercise control group, did not use rigorous dietary records such as 24-hour recalls, and involved a relatively small sample. Future research should include better dietary monitoring, longer follow-up periods, and a control group to clarify whether HIIT’s advantages persist over time.
Which statement is correct according to the passage?
- A Formal 24-hour dietary recalls allowed researchers to eliminate dietary influence.
- B MICT was superior for reducing body fat because sessions lasted seven minutes longer.
- C HIIT showed stronger body-fat reductions, with the female HIIT subgroup better.
- D The non-exercise control group proved that both interventions beat no exercise.
思路引導 VIP
當你閱讀文章最後一段有關「研究限制（limitations）」的部分時，作者提到了哪些實驗中「沒有」做到的事情？接著，請對照文章第五段關於不同性別（male/female）在不同運動模式下的具體表現，是否有哪一個組別被特別標註為效果最顯著呢？
🤖
AI 詳解
AI 專屬家教
太棒了！你能精準地從長篇學術文章中擷取關鍵數據，這展現了你優異的閱讀理解與資訊比對能力。這題之所以選擇 (C)，是因為文中在結果（Findings）段落明確提到：「HIIT 在體脂（BF%）下降幅度上優於 MICT」，且特別點出「女性 HIIT 組別表現出最大的比例下降（greatest proportional decrease）」。這完全符合選項 (C) 的敘述，顯示你對實驗結果的掌握非常到位。
關鍵細節與難度點評
這道題目的鑑別度在於「細節辨識」與「負面資訊排查」。選項 (A) 和 (D) 其實是文中提到的「研究限制」，作者明言「沒有（did not）」使用 24 小時飲食回顧，也「沒有」設置非運動對照組，考生若沒注意到否定詞，很容易落入陷阱。而選項 (B) 則是邏輯誤導，雖然 MICT 運動時間較長，但實驗數據證明 HIIT 的代謝效率更高。整體難度屬於 Medium，考驗的是你是否能不被冗長的生化專有名詞（如 ALT, UA）干擾，冷靜核實文章後半段關於實驗結論與限制的描述。