hce_cmu
115年
英文
第 46 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.
According to the passage, which statement correctly describes the exercise protocols?
- A HIIT used four high-intensity cycles; MICT used steady moderate exercise.
- B HIIT required longer continuous sessions than MICT each training day.
- C Both protocols were paired with formal supervised dietary restrictions.
- D MICT alternated sprint intervals with low-intensity treadmill recovery.
思路引導 VIP
請回想一下文章中描述實驗過程的部分，當提到這兩組學生分別在跑步機上運動時，文中用了哪些字眼來描述他們運動『節奏』的差異？其中一組是『穩定且持續』的，另一組則被拆解成好幾個『循環』，你能找到這些對應的英文關鍵字嗎？
🤖
AI 詳解
AI 專屬家教
恭喜你精準抓住了文章的核心細節！這題你答得很漂亮。這題的關鍵在於比較**高強度間歇訓練（HIIT）與中強度連續訓練（MICT）**在執行方式上的根本差異。正如你在文章第二段所見，HIIT 的設計包含四個週期（four cycles）的高強度運動與恢復期，而 MICT 則是維持在最大心率 $60\text{--}70%$ 的持續性（continuous）運動。你能夠在閱讀長文後，迅速對應到兩者的時間分配與運動模式，顯示你具備優秀的資訊檢索能力。
運動方案的細節辨析
從鑑別度的角度來看，這題考驗的是對研究設計（Research Design）的理解深度。文章提到 MICT 的單次訓練時間為 35 分鐘，其實比 HIIT 的 28 分鐘還要長，這直接排除了選項 (B) 的可能性。此外，選項 (C) 提到的飲食限制在文中被明確否定，因為研究者僅要求參與者「維持平時飲食」且「未使用正式飲食日誌」。你能避開這些細節陷阱，正確鎖定 (A) 選項中關於「四個週期」與「穩定運動」的描述，這說明你對長篇學術性文章的掌握已經相當成熟。