目的：探討單日長距離直排輪運動對人體紅血球相關指標之影響。方法：以 9 名長期從事直排輪運動的男性大學生為研究對象（年齡：20.78±2.22 歲；體重：59.78±7.54 公斤；BMI：21.62±1.97 kg/m2；最大攝氧量：54.49±5.87 ml/kg/min），所有受試者進行 148 公里的長距離直排輪運動測驗，運動時間長達 7 小時，運動強度維持在最大心跳率 70％以上，並於運動前一天上午、運動後立即抽取肘中靜脈血液，分析紅血球計數 (RBC) 、血紅素 (hemoglobin, Hb) 、血球容積比 (haematocrit, Hct) 、平均紅血球容積 (MCV) 、平均紅血球血紅素含量 (MCH) 與平均紅血球血紅素濃度 (MCHC) 的變化情形，並以 Dill and Costill (1974) 公式進行血球容積比 (Hct) 的校正。結果：所有受試者從事 148 公里直排輪運動前、後，其 RBC (4.91±0.48 vs. 4.68±0.36×1012 cells/L)、Hb (14.94±0.90 vs. 14.81±0.80 g/dl)、Hct (42.61±2.71 vs. 42.42±2.64 %)、MCV (87.32±9.12 vs. 87.20±9.29 pg)、MCH (30.71±3.81 vs. 30.52±3.79 fl)、MCHC (35.06±0.90 vs. 34.93±0.85 g/dl) 等參數皆無顯著差異 (p>.05) 。結論：直排輪選手從事單日長時間激烈運動後，對紅血球相關指標（RBC、HB、Hct、MCV、MCH、MCHC）不致於出現負面影響。不過，連續之長時間激烈運動後（如連續一週）的影響，則有待進一步的評估。

Purpose: The purpose of this study was to investigate the effect of long distance In-Line Skating on the levels of erythrocyte indices. Methods: Night college male In-Link Skating athletes participated in this study (age: 20.78±2.22 yr; body weight: 59.78±7.54 kg; BMI: 21.62±1.97 kg/m2
; V ‧O2max: 54.49±5.87 mL/kg/min). The nine participants were obtained for 148km In-Line Skating test. Exercise time about 7 hours, exercise Intensity at 70%HRmax. Venous blood samples was collected at pre-exercise and post exercise immediately. Red blood cells (RBC), hemoglobin (Hb), haematocrit (Hct), MCV, MCH, MCHC were measured. The haematocrit were corrected according to Dill and Costill (1974). Result: There were no significant changes in RBC (4.91±0.48 vs. 4.68±0.36×1012/L), Hb (14.94±0.90 vs. 14.81±0.80 g/dl), Hct (42.61±2.71 vs. 42.42±2.64 %),
MCV (87.32±9.12 vs. 87.20±9.29 pg), MCH (30.71±3.81 vs. 30.52±3.79 fl), MCHC (35.06±0.90 vs. 34.93±0.85 g/dl) immediately after the 148km In-Line Skating test (p>.05). Conclusion: The 100Km In-Line Skating exercise did not significant influence the levels of compared with baseline RBC, Hb, Hct, MCV, MCH, MCHC after single bout of long-term strenuous exercise.