Association of age-related decrease in intracellular-to-total water ratio with that in explosive strength of the plantar flexors: a cross-sectional study.
Association of age-related decrease in intracellular-to-total water ratio with that in explosive strength of the plantar flexors: a cross-sectional study.
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DOI：
10.1186/s40101-022-00284-2
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发表时间：
2022-03-26
影响因子：
3.1
通讯作者：
Akagi R
中科院分区：
文献类型：
--
作者：
Hirata K;Iida N;Kanda A;Shoji M;Yoshida T;Yamada Y;Akagi R
我们的目的是研究细胞内总水比与足底屈肌爆炸强度的年龄相关差异的关系。共招募了60名青年（21-33岁）和老年人（64-83岁）。采用生物电阻抗谱法测定右腿内细胞内- (ICW)和总水（TW）含量，分别作为肌肉细胞质量和节段内全肌肉质量的指标。计算ICW/TW （ICW/TW）作为全肌内肌肉细胞占用率的指标。最大自主等距足底屈曲时的扭矩发展率（RTD）和肌电图（EMG）活动分别作为爆发力和神经肌肉活动的指标。RTD从0 - 50ms、50 - 100ms和100 - 200ms三个时间窗口计算。通过诱发抽搐收缩来评估峰值扭矩时间（TPT）。与年轻参与者相比，老年参与者表现出较低的ICW/TW (- 7%, P < 0.001)， RTD（- 25至- 40%，P = 0.003至0.001）和较长的TPT （+11%, P < 0.001）。ICW/TW与RTD呈正相关（r = 0.377 ~ 0.408, P = 0.004 ~ 0.001），与TPT呈负相关（r = - 0.392, P = 0.002），但与肌电活动无关。RTD与肌电图在每个时间窗均呈正相关（r = 0.527 ~ 0.607, P < 0.001）。这些结果表明，ICW/TW可能是RTD年龄相关下降的有效预测指标，ICW/TW随年龄的下降可能反映了内在收缩特性的年龄相关变化。
We aimed to investigate the association of age-related differences in the intracellular-to-total water ratio with explosive strength of the plantar flexors. A total of 60 young (21–33 years) and older (64–83 years) individuals were recruited. Intracellular- (ICW) and total-water (TW) content within the right leg was evaluated by bioelectrical impedance spectroscopy as indicators of muscle cell mass and whole muscle mass within the segment, respectively. ICW divided by TW (ICW/TW) was calculated as an index of the occupancy of muscle cells within whole muscle. Rate of torque development (RTD) and electromyography (EMG) activity during maximal voluntary isometric plantar flexion were measured as indicators of explosive muscle strength and neuromuscular activity, respectively. RTD was calculated from three time windows of 0–50, 50–100, and 100–200 ms. Time-to-peak torque (TPT) was assessed from evoked twitch contraction. Compared with young participants, older participants showed lower ICW/TW (−7%, P < 0.001), RTD (−25 to −40%, P = 0.003 to 0.001), and longer TPT (+11%, P < 0.001). ICW/TW associated positively with RTD (r = 0.377 to 0.408, P = 0.004 to 0.001) and negatively with TPT (r = −0.392, P = 0.002), but not with EMG activity. RTD was associated positively with EMG for each time window (r = 0.527 to 0.607, P < 0.001). These results indicate that ICW/TW may be a useful predictor of the age-related decrease in RTD, and that the decrease in ICW/TW with age may reflect age-associated changes in intrinsic contractile properties.
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影响因子：
6.3
作者：
Watanabe D;Yoshida T;Watanabe Y;Yamada Y;Kimura M;Group KS
通讯作者：
Group KS
DOI：
10.1152/japplphysiol.00539.2016
发表时间：
2017-08-01
期刊：
Journal of applied physiology (Bethesda, Md. : 1985)
影响因子：
--
作者：
Ema R;Ohki S;Takayama H;Kobayashi Y;Akagi R
通讯作者：
Akagi R
DOI：
10.1093/gerona/glq001
发表时间：
2010-05-01
影响因子：
5.1
作者：
Yamada, Yosuke;Schoeller, Dale A.;Oda, Shingo
通讯作者：
Oda, Shingo
DOI：
10.1249/mss.0b013e3181be9c7e
发表时间：
2010-04-01
期刊：
MEDICINE AND SCIENCE IN SPORTS AND EXERCISE
影响因子：
--
作者：
Tillin, Neale A.;Jimenez-Reyes, Pedro;Folland, Jonathan P.
通讯作者：
Folland, Jonathan P.
影响因子：
3
作者：
Izquierdo, M;Aguado, X;Häkkinen, K
通讯作者：
Häkkinen, K