Physical activity (PA) classes help college students add weekly PA, which can help improve health and maintain body weight. Traditional weight training (TWT) can improve strength and aerobic capacity. High-intensity functional training such as CrossFit^® (CF) provides time-efficient workouts with both muscle strengthening and aerobic exercises. Limited research has compared these classes for college students. We examined changes in muscular strength, power, and endurance as well as body composition. Participants were 85 healthy college students enrolled in TWT (n = 36, age 22.6 ± 4.1 years, 72.2% male) or CF (n = 49, age 21.8 ± 3.2 years, 55.1% male) classes meeting twice/wk for 8 weeks between October 2017 and May 2018. Baseline and posttest measurements included a vertical jump, grip strength, a 2 min push-up test, a 1 min squat test, height, weight, and a bioelectrical impedance analysis. Although no significant group × time interactions were found, there was a significant main effect of time for push-ups and squats (both p < 0.001). Participants enjoyed the classes and most planned to continue. Both classes improved muscular endurance although no significant differences were found between them. Activity classes provide college students with an option for increasing their weekly PA and help maintain body composition. Future research should examine the benefits from longer or more frequent classes.

中文翻译：

---

两次不同的大学健身课程后的肌肉力量、爆发力和耐力适应

体育活动 (PA) 课程帮助大学生每周增加 PA，这有助于改善健康和保持体重。传统的重量训练 (TWT) 可以提高力量和有氧能力。CrossFit ^® (CF)等高强度功能性训练可提供具有时间效率的锻炼，包括肌肉强化和有氧运动。有限的研究比较了大学生的这些课程。我们检查了肌肉力量、爆发力和耐力以及身体成分的变化。参与者是 85 名参加 TWT 的健康大学生（n = 36，年龄 22.6 ± 4.1 岁，72.2% 男性）或 CF（n= 49，年龄 21.8 ± 3.2 岁，55.1% 男性）班级在 2017 年 10 月至 2018 年 5 月期间每周两次，为期 8 周。基线和测试后测量包括垂直跳跃、握力、2 分钟俯卧撑测试、1最小深蹲测试、身高、体重和生物电阻抗分析。虽然没有发现显着的组×时间交互作用，但俯卧撑和深蹲的时间有显着的主效应（p < 0.001）。参与者喜欢这些课程，并且大多数人计划继续。两个级别都提高了肌肉耐力，尽管它们之间没有发现显着差异。活动课程为大学生提供了增加每周 PA 并帮助保持身体成分的选择。未来的研究应该检查更长或更频繁的课程的好处。