School of Exercise and Health, Shanghai University of Sport, Shanghai, China.
Pinghu Normal University, Jiaxing University, Jiaxing, China.
PeerJ. 2024 Jun 28;12:e17606. doi: 10.7717/peerj.17606. eCollection 2024.
To investigate the effects of 12-week weight-bearing dance aerobics (WBDA) on muscle morphology, strength and functional fitness in older women.
This controlled study recruited 37 female participants (66.31y ± 3.83) and divided them into intervention and control groups according to willingness. The intervention group received 90-min WBDA thrice a week for 12 weeks, while the control group maintained normal activities. The groups were then compared by measuring muscle thickness, fiber length and pennation angle by ultrasound, muscle strength using an isokinetic multi-joint module and functional fitness, such as 2-min step test, 30-s chair stand, chair sit-and-reach, TUG and single-legged closed-eyed standing test. The morphology, strength, and functional fitness were compared using ANCOVA or Mann-Whitney U test to study the effects of 12 weeks WBDA.
Among all recruited participants, 33 completed all tests. After 12 weeks, the thickness of the vastus intermedius ( = 17.85, < 0.01) and quadriceps ( = 15.62, < 0.01) was significantly increased in the intervention group compared to the control group, along with a significant increase in the torque/weight of the knee flexor muscles ( = 4.47, = 0.04). Similarly, the intervention group revealed a significant improvement in the single-legged closed-eyed standing test (2.16, = 0.03) compared to the control group.
The study concluded that compared to the non-exercising control group, 12-week WBDA was shown to thicken vastus intermedius, increase muscle strength, and improve physical function in older women. In addition, this study provides a reference exercise program for older women.
研究 12 周抗阻舞蹈有氧运动（WBDA）对老年女性肌肉形态、力量和功能的影响。
这项对照研究招募了 37 名女性参与者（66.31 岁±3.83 岁），并根据意愿将她们分为干预组和对照组。干预组每周接受 3 次、每次 90 分钟的 WBDA，而对照组则保持正常活动。然后通过超声测量肌肉厚度、纤维长度和羽状角，使用等速多关节模块测量肌肉力量，以及通过 2 分钟台阶测试、30 秒坐站测试、坐-前伸测试、计时起身行走测试和单腿闭眼站立测试评估功能适应性，来比较两组。使用 ANCOVA 或曼-惠特尼 U 检验比较形态、力量和功能适应性，以研究 12 周 WBDA 的效果。
在所有招募的参与者中，有 33 人完成了所有测试。12 周后，与对照组相比，干预组股中间肌（ = 17.85， < 0.01）和股四头肌（ = 15.62， < 0.01）的厚度显著增加，同时膝关节屈肌的扭矩/体重也显著增加（ = 4.47， = 0.04）。同样，与对照组相比，干预组单腿闭眼站立测试（2.16， = 0.03）也有显著改善。
与非运动对照组相比，12 周的 WBDA 可使股中间肌变厚，增强肌肉力量，并改善老年女性的身体功能。此外，本研究为老年女性提供了一个参考锻炼方案。
