臺灣博碩士論文加值系統

研究主要目的在瞭解公路車架在固定訓練台上的踩踏頻率與不同車架設定下之下肢肌肉活化情況，進而探討最佳踩踏頻率。共有5位休閒公路車騎士被招募參與實驗。研究實驗設計四種踩踏頻率，分別為 70、80、90、100 rpm，配合3種水平上管長度530、560、590 mm 車架設定，共十二種實驗情境。量測右腳股直肌、股二頭肌、臀大肌、脛前肌、內腓腸肌、外腓腸肌與比目魚肌等七處之肌電訊號，並量測踩踏週期之膝關節角度變化。研究應用重複量數二因子變異數法，分析受試者在十二種實驗情境，下肢作用肌在不同膝關節角度的肌電圖改變情況。以踩踏提昇段與下踩段兩階段分析，統計分析結果顯示在α=0.05 顯著水準下，(1) 車架設定與踩踏頻率兩因子交互作用、(2)踩踏頻率因子之主要效用、及(3)車架設定因子之主要效用均無法被本研究實驗所證實。在不同車架設定成對比較中，股二頭肌與脛前肌在踩踏提昇段時，車架 530 mm其肌肉活化顯著低於車架560 mm。較短的車架水平上管長度，在提昇段時減少肌肉活化，有較佳之騎乘效率。在不同踩踏頻率成對比較中，脛前肌在下踩段時，踩踏頻率70 rpm其肌肉活化顯著低於踩踏頻率 100 rpm。低踩踏頻率能在下踩段時減少脛前肌活化，有較佳之騎乘效率。研究結論對於參與實驗的休閒公路車騎士，較短車架設定( 530mm)與低踩踏頻率(70 rpm)，是最適合的組合。

關鍵詞：自行車運動、單車設定、肌電圖

The aim of this study is to compare the lower extremity EMG changes in different pedaling rates and frame settings of road bike at fixed training platform, and then explore the best pedaling rate. Five recreational road bike riders were recruited in this study. Four pedaling rates 60, 70, 80, and 90 rpm, with the three frames setting (top tube length 530, 560, and 590 mm) were counterbalanced. Surface EMG signals of rectus femoris (RF), biceps femoris (BF), gluteus maximus (GMax), tibialis anterior (TA), gastrocnemius medialis (GM), gastrocnemius lateralis (GL), soleus (SOL) muscles, and the knee joint angle during the pedaling cycle were measured. Repeated measures two-way ANOVA was applied to analyze the lower extremity EMG under the twelve experimental designs.
By the two-stage analysis of the lifting section and the stepping section, the statistical analysis results showed that under the α=0.05 significant level, (1) the two-factor interaction between the frame setting and the pedaling frequency, (2) the main effects of the pedaling frequency factor, and (3) The main effect of the frame setting factor could not be confirmed by this research experiment. In the comparison of frame settings, muscle activation in BF and TA at 530 mm was significantly lower than the frame 560 mm during the lifting section. The short frame length of the upper tube reduced the muscle activation during the lifting section, resulting in better riding efficiency. In the paired comparisons of pedaling rates, when the muscle activation of TA for the pedaling rate of 70 rpm was significantly lower than the pedaling rate of 100 rpm. The low pedaling rate can reduce the activation of the TA muscle at the stepping stage, In conclusion, for recreational road bike riders in present study, a shorter frame setting at 530mm and a lower pedaling rate at 70 rpm are the most appropriate combination.

Keyword: Cycling Sport、Bike Fitting、EMG

目次
中文摘要 i
英文摘要 ii
誌謝詞 iv
目次 v
表次 vii
圖次 ix
第一章 緒論 1
第一節 研究動機 1
第二節 研究目的 2
第三節 研究假設 2
第四節 研究範圍與限制 2
第五節 名詞釋義 3
第二章 文獻探討 5
第一節 公路車介紹與設定幾何 5
第二節 公路車設定與踩踏頻率對騎乘效率之研究 12
第三章 研究方法 16
第一節 研究設計 16
第二節 研究工具 18
第三節 實施程序與步驟 21
第四節 資料處理與統計方法 23
第四章 結果分析與討論 24
第一節 受試者基本資料與實驗資料 24
第二節 各受試者在不同車架設定與踩踏頻率下肌電圖分析 28
第三節 不同車架設定與踩踏頻率下之平均肌電圖分析 42
第四節 車架設定與踩踏頻率二因子混合設計變異數分析 49
第五章 結論與建議 66
第一節 結論 66
第二節 建議 67
參考文獻 68

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