Aquatic Research



L.J. D’Acquisto, D.M. D’Acquisto, and D. Renne,  Central
Washington University, Ellensburg, WA. 98926.

The purpose of this investigation was to examine the physiological demands of older female adults performing shallow water exercise.  Sixteen females (mean+ SE): Age(yr): 66.3+1.3; Wt.(kg):76.3+3.2;  Ht.(cm):166.6cm+1.6; Fat(%): 33.5+1.6), who were not taking cardiac medication, participated.  Participants performed five, eight min., evenly paced, self-selected shallow water exer. (SWE) bouts, ranging from low to moderate intensity. Metabolic response was measured by collecting expired air in metereological balloons during the final 75-120 sec. of each bout,  while HR was monitored by a Polar HR monitor throughout. Also,  HR was monitored during a 40 min. SWE class.  Individual   r   values for HR vs. VO2 were all >0.96 (p<0.05).  Est.  peak VO2 was 1.76+0.09 l.min-1 (23.30+1.18, while est. peak HR was 144+1 bpm (210-age).  Results for SWE bouts 1 to 5:  (1) HR and VO2 increased (p<0.05) from 90+3 to 120+3 bpm (~62 to 83% est. peak HR) and 0.56+ 0.02 to 1.18+0.06 l.min-1 (~33 to 69% est. peak VO2), respectively; (2) VE increased (p<0.05) from 17.54+1.23 to 35.77+ 2.19 l.min-1;  (3) VE/VCO2 decreased from 39.27+1.90 to 36.76+1.32 (l air/1 liter CO2) (p<0.05),  while VE/VO2 remained steady, 31.35+35 to 30.21+0.96 (l air/ 1 liter O2) (p>0.05).  The 40 min. SWE class consisted of a warmup (W), main workout (MW) and cooldown (C).  HR responses during W, MW, and C were 99+3, 112+4, and 96+3, which correspond to ~70, 78, and 68% of est.. peak HR., respectively.  In conclusion, shallow water exercise performed by older female adults elicits metabolic and HR responses which meet ACSM’s guidelines for enhancing cardiorespiratory fitness.