Metabolic response to shallow water exercise

METABOLIC AND CARDIOVASCULAR RESPONSE TO SHALLOW
WATER EXERCISE  IN 60 TO 80 YEAR OLD FEMALES.
      D’Acquisto, L.J.,  D’Acquisto, D.M., Renne, D., Bates, K.,Pallotta,G.,
      Nethery, V.  Exer. Sci.  Laboratory,  Depart. of  Physical and Health  Education,
      and Leisure   Services.Ellensburg, WA. 98926

The purpose of  this investigation was to examine the metabolic and cardiovascular demands of shallow water exercise in older females.  Eighteen active older females, not taking cardiac medication, participated in this investigation (mean+SE; age, 66.4+1.2yr.; Ht.,167.1+1.4cm; Wt.,75.6+3.2kg; %Fat,33.2+1.7). Testing included: (1) resting metabolic measurements, (2) performing 5, 8- min. evenly paced self selected submax. water exer. bouts:expired air was collected during  the final three min., while HR was recorded (Polar HR monitor), and (3) a  40 min. water exer. class in which HR was monitored.    Results:  (1)  one MET equaled 2.7+0.1
ml.min-1.kg-1, resting HR-63.4+2.2 bpm; (2) average submax. MET, HR and RPE (Borg Scale)  responses for exer. bouts one to five ranged from 2.8+0.1 to 5.8+0.3,  89.7+3.0 to 119.5+3.3 bpm, and 8.0+0.3 to 12.5+0.4, respectively;  (3) a linear relationship between MET-HR was found for each participant,  all r values >0.96(p<0.05); (4) estimated MET & measured HR responses for the 40 min. water exercise class: warmup, 4.0+0.3 & 99.5+3.4;  body of workout, 5.4+0.4 & 112.3+3.6; cooldown, 3.6+0.3 &  95.5+3.0; (6) the exer. intensity ranged from  ~ 66 to 80% of pred.HR max.  In conclusion, shallow water exercise elicits metabolic and cardiovascular responses which meet the ACSM exercise prescription guidelines for enhancing physical fitness.  The following RPE and MET values for light (L), moderate (M), and heavy (H) water exercise is proposed for older females: L:7-10 & 2.0-3.8;  M:11-13 & 3.8-5.8; H: >13 & > 5.8.