McGill University, Montreal, Quebec, Canada.
Feil & Oberfeld/CRIR Research Center, Jewish Rehabilitation Hospital, Laval, Quebec, Canada.
Hum Factors. 2023 May;65(3):435-449. doi: 10.1177/00187208211022147. Epub 2021 Jun 2.
To investigate the effect of one's sex and pedaling intensity on upper body muscle activation patterns during typing while cycling.
Females are at a higher risk for computer work-related musculoskeletal disorders, and mobile workstations have been suggested to induce healthier muscular patterns compared with sitting. However, the neuromuscular characteristics of performing computer work in a cycling workstation have not been investigated.
Twenty-two participants (10 females) completed a 60-min computer typing task while pedaling on a cycle ergometer at two different intensities (25%, 4% heart rate reserve). Surface electromyography (EMG) was recorded from seven muscles of the upper body. Effects of time, sex, and intensity were assessed for muscle activation (RMS), activation variability (CV), and normalized mutual information (NMI) via generalized estimating equations.
With time, neck/shoulder CV increased in males during higher pedaling intensity, whereas in females it decreased during lower intensity. In females, RMS of neck/shoulder and NMI of neck/shoulder muscle pairs were lower, whereas forearm RMS was 34.2% higher with higher intensity cycling compared with lower intensity. Lower back RMS decreased 28.3% in the initial half of the task in females, but in males it increased 14.4% in the later half.
Cycling workstation showed a sex- and intensity-specific EMG response. These differing responses should be considered when implementing the use of cycling workstation and may be important for preventing/managing sex-specific muscle fatigue and musculoskeletal disorders.
研究性别和踩踏强度对骑行时打字过程中上身肌肉激活模式的影响。
女性患与计算机相关的肌肉骨骼疾病的风险更高，移动工作站被认为比坐姿更能诱导更健康的肌肉模式。然而，在骑行工作站上执行计算机工作的神经肌肉特征尚未得到研究。
22 名参与者（10 名女性）在自行车测功计上以两种不同强度（25%、4%心率储备）踩踏 60 分钟，完成计算机打字任务。记录来自上身 7 块肌肉的表面肌电图（EMG）。通过广义估计方程评估时间、性别和强度对肌肉激活（RMS）、激活变异性（CV）和归一化互信息（NMI）的影响。
随着时间的推移，男性在较高踩踏强度下颈部/肩部 CV 增加，而女性在较低强度下则减少。在女性中，颈部/肩部的 RMS 和颈部/肩部肌肉对的 NMI 较低，而与较低强度相比，高强度骑行时前臂的 RMS 高 34.2%。女性在任务的前半部分，下背部的 RMS 降低了 28.3%，而男性在后半部分增加了 14.4%。
骑行工作站表现出性别和强度特异性的肌电图反应。在实施使用骑行工作站时，应考虑这些不同的反应，这对于预防/管理特定性别肌肉疲劳和肌肉骨骼疾病可能很重要。
