Lower-extremity joint kinematics and muscle activations during semi-reclined cycling at different workloads in healthy individuals.
Lower-extremity joint kinematics and muscle activations during semi-reclined cycling at different workloads in healthy individuals.
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DOI：
10.1186/1743-0003-11-146
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发表时间：
2014-10-17
影响因子：
5.1
通讯作者：
Evans M
中科院分区：
文献类型：
--
作者：
Momeni K;Faghri PD;Evans M
更好地了解下肢肌肉在不同工作负荷下的激活模式和关节运动学，可以帮助康复专业人员为老年人和肌肉受损的人制定更有效的运动方案。我们研究了相对贡献，以及激活和共激活模式，下肢肌肉在半卧骑自行车在不同的工作负荷，在一个恒定的节奏。15名健康的初学者参加了三个90秒的自行车试验，随机分配的工作负荷为0，50和100 W，在恒定的节奏为60 rpm。在所有试验中，记录了下肢四块肌肉的肌电图：股直肌（RF）、股二头肌（BF）、胫骨前肌（TA）和腓肠肌内侧肌（GT）。关节运动学也被记录并与EMG数据同步。从记录的数据中提取肌肉爆发开始、偏移、活动持续时间、峰值幅度和峰值时间，以及平均关节角度和平均运动范围，并在工作负荷之间进行比较。随着工作负荷的增加，BF和TA在每个周期中显示出更早的激活和延迟的失活，这导致在更高的工作负荷下显著（p <0.05）更长的活动持续时间。RF在0~50 W和0~100 W时的活动持续时间显著延长（p <0.05），而GT的活动持续时间不受负荷的影响。随着工作负荷的增加，RF、BF和TA的EMG峰幅值显著变化（p <0.05），但在不同工作负荷下未观察到EMG峰时变化。RF-BF对和RF-TA对的共激活持续时间随着工作负荷显著增加，而RF-TA和TA-GT对仅在0和100 W工作负荷水平之间存在显著差异（p <0.05）。增加的工作负荷并没有导致关节运动学的任何显著变化。肌肉的活动模式以及共激活模式受到健康个体骑自行车工作量变化的显著影响。在骑自行车时应考虑这些变化，特别是老年人和肌肉骨骼系统受损的人。未来的研究应该评估这些人群特有的这种变化。本文的在线版本（doi：10.1186/1743 - 0003 - 11 - 146）包含补充材料，可供授权用户使用。
A better understanding of lower-extremity muscles’ activation patterns and joint kinematics during different workloads could help rehabilitation professionals with prescribing more effective exercise regimen for elderly and those with compromised muscles. We examined the relative contribution, as well as activation and co-activation patterns, of lower-extremity muscles during semi-reclined cycling at different workloads during a constant cadence. Fifteen healthy novice cyclists participated at three 90-second cycling trials with randomly assigned workloads of 0, 50, and 100 W, at a constant cadence of 60 rpm. During all trials, electromyograms were recorded from four lower-extremity muscles: rectus femoris (RF), biceps femoris (BF), tibialis anterior (TA), and gastrocnemius medialis (GT). Joint kinematics were also recorded and synchronized with the EMG data. Muscle burst onset, offset, duration of activity, peak magnitude, and peak timing, as well as mean joint angles and mean ranges of motion were extracted from the recorded data and compared across workloads. As workload increased, BF and TA displayed earlier activations and delayed deactivations in each cycle that resulted in a significantly (p < 0.05) longer duration of activity at higher workloads. RF showed a significantly longer duration of activity between 0 and 50 W as well as 0 and 100 W (p < 0.05); however, the activity duration of GT was not appeared to be affected significantly by workload. EMG peak-magnitude of RF, BF, and TA changed significantly (p < 0.05) as workload increased, but no changes were observed in the EMG peak-timing across workloads. Durations of co-activation in the RF-BF pair as well as the RF-TA pair increased significantly with workload, while the RF-TA and TA-GT pairs were only significantly different (p < 0.05) between the 0 and 100 W workload levels. Increased workload did not lead to any significant changes in the joint kinematics. Muscles’ activity patterns as well as co-activation patterns are significantly affected by changes in cycling workloads in healthy individuals. These variations should be considered during cycling, especially in the elderly and those with compromised musculoskeletal systems. Future research should evaluate such changes specific to these populations. The online version of this article (doi:10.1186/1743-0003-11-146) contains supplementary material, which is available to authorized users.
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影响因子：
2.5
作者：
RYAN, MM;GREGOR, RJ
通讯作者：
GREGOR, RJ
影响因子：
2.5
作者：
Bini, Rodrigo Rico;Diefenthaeler, Fernando;Mota, Carlos Bolli
通讯作者：
Mota, Carlos Bolli
DOI：
10.1249/mss.0b013e3181e05526
发表时间：
2010-11-01
期刊：
MEDICINE AND SCIENCE IN SPORTS AND EXERCISE
影响因子：
--
作者：
Sacchetti, Massimo;Lenti, Mauro;De Vito, Giuseppe
通讯作者：
De Vito, Giuseppe
影响因子：
2.4
作者：
Neptune, RR;Kautz, SA;Hull, ML
通讯作者：
Hull, ML
DOI：
10.1109/memb.2004.1310977
发表时间：
2004-03-01
影响因子：
--
作者：
Trumbower, RD;Faghri, PD
通讯作者：
Faghri, PD