Abstract
Spinal shrinkage wasusedasanindicant ofloading onthespine incircuit weight-training andrunning regimes. Theloss of stature during twosetsofacircuit ofweight-training (n= 10), a6kmrunbynovices (n=9)anda-25 kmrunbytrained runners (n= 7)wasassessed inmalesubjects. Shrinkage wasnotsignificantly different between theweight-training regime andthe 6kmrunbynovices, meanlosses being5.4and3.25mm respectively. Therate ofheight loss intheexperienced runners was 2.35mm over6kmrunat12.2km.h-1, representing 0.4mm.km-1overthe6kmrun,this shrinkage ratebeing continued over thelast 19kmrunat14.7km.h-1. Thelossofheight could notbepredicted fromasetofcovariates. Themagnitude ofthe circadian variation, mean14.4mm,exceeded thechange inheight during the25kmrun.Thediurnal variation conformed toa cosine function, though abetter fit wasobtained withapowerfunction equation. Amarkeddiurnal pattern wasalso observed inlumbarextension. Thoughreversal ofspinal shrinkage wasobserved during anight's sleep, nosignificant recovery occurred during a20minresting period immediately following theexercise regimes. Theseresults haveimplications forthe warm-upandtiming ofexercise regimes thatimpose significant loading onthespine.
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