UPSI Digital Repository (UDRep)
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Abstract : Universiti Pendidikan Sultan Idris |
The maximum force output of skeletal muscle exhibits a circadian rhythm and is associated with
time-of-day differences in athletic performance. We investigated whether the diurnal difference
in force output is associated with changes to the post-translational state of muscle proteins using
non-targeted proteomic techniques. Ten physically active men (mean ± SD; age 26.7 ± 3.7 y,
height 1.77 ± 0.08 m, body mass 74.9 ± 9.8 kg) performed experimental sessions in the morning
(0800 h) and evening (1700 h) that were counterbalanced in order of administration and
separated by at least 72 h. Each session included measurements of maximal voluntary
contraction (MVC; including twitch-interpolation) and peak rate of force development (RFD) of
the knee extensors. Samples of vastus lateralis were collected immediately after exercise and
were analysed by ‘top-down’ and ‘bottom-up’ proteomic methods. Muscle force in the evening
(754.4 ± 112.9 N) was significantly (P |
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