Trading force for speed: why superfast crossbridge kinetics leads to superlow forces.
Trading force for speed: why superfast crossbridge kinetics leads to superlow forces.
复制标题
用力换取速度:为什么超快的过桥动力学会导致超低的力。
DOI:
10.1073/pnas.96.10.5826
复制
发表时间:
1999
影响因子:
11.1
通讯作者:
Goldman,YE
中科院分区:
文献类型:
--
作者:
Rome,LC;Cook,C;Syme,DA;Connaughton,MA;Ashley-Ross,M;Klimov,A;Tikunov,B;Goldman,YE
Superfast muscles power high-frequency motions such as sound production and visual tracking. As a class, these muscles also generate low forces. Using the toadfish swimbladder muscle, the fastest known vertebrate muscle, we examined the crossbridge kinetic rates responsible for high contraction rates and how these might affect force generation. Swimbladder fibers have evolved a 10-fold faster crossbridge detachment rate than fast-twitch locomotory fibers, but surprisingly the crossbridge attachment rate has remained unchanged. These kinetics result in very few crossbridges being attached during contraction of superfast fibers (only ≈1/6 of that in locomotory fibers) and thus low force. This imbalance between attachment and detachment rates is likely to be a general mechanism that imposes a tradeoff of force for speed in all superfast fibers.
登录
查看更多内容
DOI:
10.1086/bblv193n2p251
发表时间:
1997
期刊:
The Biological bulletin
影响因子:
--
作者:
Syme,DA;Connaughton,MA;Rome,LC
通讯作者:
Rome,LC
DOI:
10.1073/pnas.87.1.414
发表时间:
1990
影响因子:
11.1
作者:
Sweeney,HL;Stull,JT
通讯作者:
Stull,JT
DOI:
--
发表时间:
1986
期刊:
Journal of Physiology
影响因子:
--
作者:
M. Cannell
通讯作者:
M. Cannell
DOI:
--
发表时间:
1968
期刊:
Journal of Physiology
影响因子:
--
作者:
R. Woledge
通讯作者:
R. Woledge
影响因子:
5.5
作者:
HOU, TT;JOHNSON, JD;RALL, JA
通讯作者:
RALL, JA