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E ig h teen m ale s u b je c ts p a r t i c ip a te d in an in v e s t ig a t io n to exam ine th e e f f e c t s o f s t a t i c , dynam ic, and com bination work ( s t a t i c and dynam ic) on th e v a r ia b le s h e a r t r a t e , s y s t o l i c and d i a s t o l i c blood p re s s u re , p r e s s u re r a t e p ro d u c t, and maximal oxygen consum ption » (VO2 m ax). The s u b je c t s , who w ere a l l f r e e from any c a rd io v a s c u la r p rob lem s, w ere d iv id e d in to 3 g roups based on t h e i r maximum oxygen consum ption l e v e l s . The h ig h (Group I ) , m oderate (Group 2 ) , and low (Group 3) a e ro b ic c a p a c ity groups had mean VO  ̂ max l e v e l s o f 64, 55, and 47 ml*kg'*^.min“ ^ , r e s p e c t iv e ly . Each s u b je c t perform ed a s t a t i c t e s t (h o ld in g a w eigh ted b r i e f c a s e ) , a dynamic t e s t (w alking on a t r e a d m il l ) and a com bination t e s t (h o ld in g a w eigh ted b r i e f c a se w h ile w alk ing on a t r e a d m i l l ) . W orkloads f o r a l l s u b je c t s w ere r e l a t i v e to t h e i r VC  ̂ max l e v e l and to t h e i r maximum v o lu n ta ry c o n t ra c t io n . In a d d i t io n to th e s t a t i c t e s t , dynamic t e s t , and th e com bination t e s t , w hich w ere c o u n te r-b a la n c e d to p re v e n t any o rd e r in g e f f e c t , th e su b jec ts a ls o perform ed two maximal t r e a d m il l t e s t s in o rd e r to o b se rv e w hether s t a t i c c o n t r a c t io n s d u rin g maximal work would in c re a s e VOj max. The f i r s t was a s ta n d a rd dynamic t r e a d m i l l t e s t w h ile th e second fo llow ed th e same p ro to c o l w ith th e a d d i t io n o f a s t a t i c component d u rin g th e l a s t 2 m in u te s . S t a t i s t i c a l a n a ly s i s (MANOVA, ANOVA, D uncan 's M u ltip le Range T e s t) re v e a le d th a t a e ro b ic f i t n e s s l e v e l d id n o t a f f e c t th e h e a r t r a t e , b lood p re s s u re , o r p r e s s u r e r a te p ro d u c t re sp o n se to th e th r e e ty p e s o f work exam ined. F u rth e rm o re , max was n o t in c re a s e d by th e a d d i t io n o f s t a t i c work d u rin g a maximal t e s t . H eart r a t e and p re s s u re r a t e p ro d u c t w ere s ig n i f i c a n t l y h ig h e r (j) ^ .0 5 ) d u r in g com bination vii work th a n d u rin g dynamic w ork, and d u rin g dynamic work th e y w ere s i g n i f i c a n t l y h ig h e r th a n d u rin g s t a t i c w ork. D ia s to l ic blood p re s ­ su re s w ere s ig n i f i c a n t l y d i f f e r e n t a c ro s s a l l th r e e modes o f work. O rdered from h ig h to low , th e y w ere s t a t i c work, com bination w ork, and dynamic work. S y s to l ic g lood p re s s u re was s ig n i f i c a n t l y h ig h e r f o r com bination work, b u t m easures ta k e n d u rin g s t a t i c and dynamic work w ere n o t s ig n i f i c a n t l y d i f f e r e n t .

CARDIOVASCULAR RESPONSES IN HIGH, MODERATE, AND LOW AEROBIC CAPACITY MALES DURING STATIC AND DYNAMIC WORK