アメリカンフットボール選手における下肢の筋形態と機能的特性 Structural and functional characteristics of the lower limb muscles in American football players キーワード : MRI 抄録 52 Line Group LG n=14 Middle Skill Group MG n=18 Skill Group SG n= 20 3 MRI Power Max V 2.5%kp 5 15 10 T test I test 40yd dash Standing jump SG MG 4 MG SG LG Ⅰ. 研究目的 4 5 10kg Yoshitaka KANDA (Graduate School of Sport System, Kokushikan University) Shigeharu TANAKA (Graduate School of Sport System, Kokushikan University) Takanori TESHIMA (Graduate School of Sport System, Kokushikan University) Naoya TSUNODA (Graduate School of Sport System, Kokushikan University)
6 12 19 9 12 MRI 8 18 19 5 8 Gleim 3 5 8 3 20 Ⅱ. 研究方法 1. 被検者 1 52 Offensive line OL Defensive line DL Line Group LG, n=14 Tight end TE Running back RB Quarterback QB Linebacker LB Middle Skill Group MG, n=18 Wide receiver WR Defensive back DB Skill Group SG, n=20 3 Fig. 1 Table 1 Fig. 1. American football position Table 1. Physical characteristics of subject 2. 形態計測及び大腿部における筋体積の測定 TANITA Body Composition Analyzer MC 190, TANITA 18 LG 4 MG 8 SG 6 5cm 5kg MRI 10mm 0mm Knee
extension: KE Rectus femoris: RF Vastus lateralis: VL Vastus intermedius: VI Vasutus medialis: VM Knee flexion: KF Bioceps femoris: BFs, BFl Semitendinosus: ST Semimembranosus: SM Sartorius: Sar Gracilis: Gr ACSA Muscle volume: MV 2 ACSA 10mm MV=10* ACSA Fig. 2 10 3% 1set 10set 4. フィールドテスト 4 17 20 L test 5yd 2 I test 5yd 40yd dash Standing jump Fig. 3 L-TEST( スタートラインから 5yd 先にあるポイントを 2 往復後, 右方向にあるポイントを周りスタートラインまで戻るタイムを測定する ) I-TEST(5yd おきに置かれたポイントを中心からスタートし 両サイドラインをタッチしスタートラインまで戻るタイムを測定する ) Fig. 2. Field test method 3. 間欠的ペダリング運動時における無酸素性パワーの測定 Power Max V, COMBI 2.5 kp 5 15 10 Power Max V PC COMBI 0.1 kp rpm 14 15 Power= kp rpm 6 60 9.8 KE 5. 統計処理 RF: Rectus femoris VL: Vastus lateralis VI: Vastus intermedius VM: Vasutus medialis KF BF: Bioceps femoris ST: Semitendinosus SM: Semimembranosus Sar: Sartorius Gr: Gracilis Fig. 3. Cross-sectional muscle area measurement for thigh using MRI
post hoc test Scheffe 5% 0.7cm 3 /kg SG 7.9 0.5cm 3 /kg KF Ⅲ. 結果 1. 下肢筋群の筋体積 Fig.4 LG SG KE LG SG KF LG MG SG KE KF SG LG LG SG Fig. 5. Comparisons of muscle volume and muscle volume to whole body weight among three groups Fig. 4. Comparisons of KE and KF muscle volume 2. 膝伸展 屈曲筋力及び無酸素パワー Fig. 6 1 Fig. 7 MG SG 10 82% LG 86 Fig. 8 SG MG LG 1 4 Fig. 5 KE VM LG SG KF ST LG MG SG KE KF KE VL SG 8.7 0.5cm 3 / kg MG 10.1 0.9cm 3 /kg SG 10.4 0.7cm 3 /kg SG LG MG VM SG 6.7 0.5cm 3 /kg MG 7.1 Fig. 6. Comparisons of peak power and P.P to body weight among the three groups
Fig. 7. Comparisons of peak power decrease ratio among the three groups 4. フィールドテストの測定値と下肢筋群筋形態特性の関係 Table 3 SG MG LG MG SG LG Table 4 KE KF KE L TEST VI VM I TEST 40yd DASH Standing jump RF Table 3. Comparisons of performance test among the three groups Fig. 8. Comparisons of peak rpm in pedaling among the three groups 3. 下肢筋群の筋形態特性と機能的特性の関係 Table 2 Table 4. Relationship between muscle volume and field test Table 2. Relationship between muscle volume and power output Ⅳ. 考察 1. 下肢筋群の筋形態特性 50% 1 18 9
6 5 8 MRI 6 0.9 SG LG KE KF KE VL VM KF SG VL VM LG SG & VL VM 2. 下肢筋群の筋形態が機能的特性に及ぼす影響 14 15 3 Fig. 5 1 MG SG 10 18% LG 14% Fig. 6 SG MG LG 1 4 MG SG LG Table2 KE VL VM VL r=0.791 VM r=0.835 VL VM 7 17 7 8 KE KF Table4 KE L TEST I TEST 40yd DASH Standing jump KF KE L TEST VI VM I TEST
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