title: Validation of a 20-minute steady-state jog as an estimate of peak oxygen uptake in adolescents.
abstract: Distance run tests are often used to estimate peak oxygen uptake (peak VO2) in children. This study examined the concurrent validity of a 20-min steady-state jog (20MSSJ). The sample consisted of 43 boys and 32 girls who performed a 20MSSJ and completed a maximal treadmill test 1 week later. Peak VO2 was measured by indirect calorimetry. Subject characteristics were as follows: boys, mean age = 15.1 +/- 1.0 years, mean peak VO2 = 46.4 +/- 7.7 ml.kg-1 x min-1, mean 20MSSJ = 2.3 +/- 0.5 miles; girls, mean age = 15.3 +/- 1.1 years, mean peak VO2 = 40.4 +/- 5.1 ml.kg-1 x min-1, mean 20MSSJ = 2.1 +/- 0.5 miles. The correlation between 20MSSJ and peak VO2 was .68 across boys and girls. The regression slopes of the boys and girls were common, but the intercepts differed, F (1, 72) = 10.9, p < .05. The influence of weight and skinfold fat was examined. Separate models were developed, and the R for each was increased to .79 (SEE = 4.45 ml.kg-1 x min-1) for the model using weight and .80 (SEE = 4.36 ml.kg-1 x min-1) for the model using sum of skinfolds. The regression equations are as follows: peak VO2 = 35.10 + 6.19 (Run) + 2.96 (Gender) -0.26 (Skinfold fat) peak VO2 = 33.94 + 7.64 (Run) + 5.84 (Gender) -0.18 (Weight) (Run = 20MSSJ performance in miles; Gender; females = 0, males = 1; Skinfold fat = sum of two-site skinfolds in mm; Weight = body weight in kg).(ABSTRACT TRUNCATED AT 250 WORDS)
authors.affiliation: Department of HPERD, Southwest Texas State University, San Marcos.
authors.forename: T D
authors.initials: TD
authors.lastname: Murray
authors.forename: J L
authors.initials: JL
authors.lastname: Walker
authors.forename: A S
authors.initials: AS
authors.lastname: Jackson
authors.forename: J R
authors.initials: JR
authors.lastname: Morrow
authors.forename: J A
authors.initials: JA
authors.lastname: Eldridge
authors.forename: D L
authors.initials: DL
authors.lastname: Rainey
mesh_terms: D000293:Adolescent; D001835:Body Weight; D005069:Evaluation Studies as Topic; D005260:Female; D006801:Humans; D007590:Jogging / Q000502:physiology*; D008297:Male; D010101:Oxygen Consumption; D010809:Physical Fitness; D012885:Skinfold Thickness