( ( If ( you ( now ( ( reapply ( a ( brief ( single stimulus ) ) ) ) ( to ( ( nerve-muscle preparation ) ( connected ( to ( an ( isometric ( force transducer ) ) ) ) ) ) ) ) ) ) ) ( , ( you ( ( can ( obtain ( ( a mechanogram ) ( of ( the ( muscle ( twitch contraction ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN If) (S (NP (PRP you)) (ADVP (RB now)) (VP (VB reapply) (NP (DT a) (JJ brief) (JJ single) (NN stimulus)) (PP (TO to) (NP (NP (JJ nerve-muscle) (NN preparation)) (VP (VBN connected) (PP (TO to) (NP (DT an) (JJ isometric) (NN force) (NN transducer))))))))) (, ,) (NP (PRP you)) (VP (MD can) (VP (VB obtain) (NP (NP (DT a) (NN mechanogram)) (PP (IN of) (NP (DT the) (NN muscle) (NN twitch) (NN contraction)))))) (. .)))
If you now reapply a brief single stimulus to nerve-muscle preparation connected to an isometric force transducer, you can obtain a mechanogram of the muscle twitch contraction.
(ROOT (S (NP (NNS Muscles)) (VP (VBP need) (NP (NN stimulus)) (PP (TO to) (NP (NN contract)))) (. .)))