( ( ( ( Preserving ( the ( relative sizes ) ) ) but ) ( changing ( ( the ( magnitude ( and ( timing properties ) ) ) ) ( of ( the ( biphasic pulses ) ) ) ) ) ) ( ( ( ( alters ( movement ( ( speed or ) distance ) ) ) or ) ( ( accommodates changes ) ( in ( ( the ( inertial load ) ) ( at ( the hand ) ) ) ) ) ) . ) )
(ROOT (S (S (VP (VP (VBG Preserving) (NP (DT the) (JJ relative) (NNS sizes))) (CC but) (VP (VBG changing) (NP (NP (DT the) (NN magnitude) (CC and) (NN timing) (NNS properties)) (PP (IN of) (NP (DT the) (JJ biphasic) (NNS pulses))))))) (VP (VP (VBZ alters) (NP (NN movement) (NN speed) (CC or) (NN distance))) (CC or) (VP (VBZ accommodates) (NP (NNS changes)) (PP (IN in) (NP (NP (DT the) (JJ inertial) (NN load)) (PP (IN at) (NP (DT the) (NN hand))))))) (. .)))
Preserving the relative sizes but changing the magnitude and timing properties of the biphasic pulses alters movement speed or distance or accommodates changes in the inertial load at the hand.
(ROOT (S (NP (NNP Distance)) (VP (VBZ is) (VP (VBN defined) (PP (IN as) (NP (NP (DT the) (NN magnitude) (CC or) (NN size)) (PP (IN of) (NP (NP (NN displacement)) (PP (IN between) (NP (CD two) (NNS positions))))))))) (. .)))