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要旨:卵巣摘出骨量減少モデルマウスを用い,トレッドミル走行期間が骨特性に与える影響を調査した.12週齢,雌性ICRマウス80匹を対象とし,無作為に8群(n=10/群)に分け,卵巣摘出術(OVX;n=70)またはSHAM術(n=10)を施した.SHAM群とOVX群のうちの1群(NR)は非走行群とし,残りの6つのOVX群は走行群とした.走行時間25min,走行頻度5回/週で走行速度を低速(8m/min)・中速(16m/min)・高速(24m/min),走行期間を短期(6週間)・長期(12週間)に設定した.実験終了後,すべての対象の大腿骨および脛骨の最大荷重値を3点曲げ強度試験にて測定し,機械的骨強度を算出した.また,骨乾燥重量,灰化重量も測定した.大腿骨および脛骨の最大荷重値,機械的骨強度は走行速度,期間に対して有意な差が認められ,中速走行群と長期走行群において高値を示した.また,脛骨の最大荷重値,機械的骨強度,灰化重量では交互作用が認められた.さらに,機械的骨強度では,すべての走行群はNR群よりも有意に高値を示した.すべての走行群において機械的骨強度の低下は抑制されたが,その効果は,低速,中速の長期走行群において最も高いことが示された.
Abstract : This study investigated how different treadmill running periods effected bone mechanical strength in ovariectomized mice. Eighty female ICR mice aged 12-weeks-old were used. All mice were divided into 8 groups (n=10) randomly, and had either a sham-operation (n=10) or an ovariectomy (n=70). The SHAM group and one OVX group (NR) were used as non-running control groups, with the remainder comprising the treadmill running groups : the LA (8 m/min), MA (16 m/min), and HA (24 m/min) groups which ran for 12 weeks, and the LB (8 m/min), MB (16 m/min), HB (24 m/min) groups which ran for 6 weeks for 25 min on 5 days/week. After this experiment, maximum loads for the femur and tibia were measured by three-pointed bending test, and the bone mechanical strength of the bones was calculated. Also, the dry bone weight and ash content of the bones were measured. Maximum femur and tibia load and bone mechanical strength were affected by running speed and term significantly. Maximum load and bone mechanical strength of tibia were shown as an interaction. Bone mechanical strength in all running groups was higher than that in the NR group, significantly. This study suggested that treadmill running prevented a reduction of bone mechanical strength, and that treadmill running was most effective in the LA and MA groups (running at low and medium speed and for a long period).
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