| AEROBIC ENERGY
EXPENDITURE DURING RECREATIONAL WEIGHT TRAINING IN FEMALES AND MALES
|
Beth
Morgan, Sarah J. Woodruff and Peter M. Tiidus |
Department of Kinesiology
& Physical Education, Wilfrid Laurier University, Waterloo ON, Canada
| Received |
|
19 July 2003 |
| Accepted |
|
14 August 2003
|
| Published |
|
01 September 2003 |
©
Journal of Sports Science and Medicine (2003) 2, 117-122
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The influence of
gender on aerobic energy expenditure (EE) during weight training has not
been systematically researched. We determined the absolute and relative
EE during the performance of two weight training programs of different intensities,
durations and total work in males and females. Eight male and seven female
recreational weight trainers (20-29 y) completed two randomly ordered weight
training sessions involving 2 sets of 8 standard upper and lower body lifts
at a set cadence separated by 45 seconds rest between sets and lifts (48
hrs apart). Heavy (H) at 100% 8 Repetition Maximum (8RM), 8 reps, ~19 min
duration and light (L) at 85% 8RM, 15 reps, ~23 min duration. VO2
was determined continuously throughout the training sessions. Lean body
mass (LBM) was estimated from skin fold measures and body weight. Energy
expenditure was estimated from breath-by-breath metabolic measurements using
portable metabolic assessment equipment (Cosmed K4b2). Absolute
EE (total kJ) and rate of energy expenditure per minute (kJ per min) were
not significantly different between H and L intensities and male and female
subjects. The rate of EE averaged between approximately 10-12 kJ per min.
However, relative EE (J per kg LBM per min per unit work) were significantly
higher (p < 0.02) for females compared to males in both H: (26.46±8.06
females vs 14.36±3.02 males) and L: (19.91±4.28 females vs. 9.83±3.28 males),
intensities. It was concluded that females rely on a greater relative aerobic
EE than males when performing recreational type weight lifting programs.
KEY WORDS: Weight training, gender, aerobic energy
expenditure
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