The purpose of this study was to compare dynamic pushup (DPU) and plyometric push-up (PPU) training programs on 2 criterion measures: (a) the distance achieved on a sitting, 2-handed medicine ball put, and (b) the maximum weight for 1 repetition of a sitting, 2-handed chest press. Thirty-five healthy women completed 18 training sessions over a 6-week period, with training time and repetitions matched for the DPU (n ϭ 17) and PPU (n ϭ 18) groups. Dynamic push-ups were completed from the knees, using a 2-second-up-2-second-down cadence. Plyometric push-ups were also completed from the knees, with the subjects allowing themselves to fall forward onto their hands and then propelling themselves upward and back to the starting position, with 1 push-up completed every 4 seconds. The PPU group experienced significantly greater improvements than the DPU group on the medicine ball put (p ϭ 0.03). There was no significant difference between groups for the chest press, although the PPU group experienced greater increases.Key Words: plyometric exercise, isotonic exercise, strength training, power training Reference Data: Vossen, J.F., J.F. Kramer, D.G. Burke, and D.P. Vossen. Comparison of dynamic push-up training and plyometric push-up training on upperbody power and strength.
Objective The common cold, known as upper respiratory tract infection (URTI), is the world's most prevalent illness. The purpose of this study was to determine if physical activity is linked to the incidence and/or duration of the common cold. Method Undergraduate university students (n=200) were asked to complete two questionnaires. The Paffenbarger Physical Activity Questionnaire (PPAQ) estimated physical activity levels of participants in the previous year. The second questionnaire required participants to record the number and length of URTIs experienced over the previous year. Pearson product-moment correlation coefficients were used to analyse the relationships between physical activity (kcal/week) and the incidence and duration of URTIs. Results There was no relationship between the number of kilocalories expended per week through physical activity and the incidence ( r=-0.042, p=0.304) or duration (r=-0.014, p=0.434) of URTIs. Conclusion In the specific population of undergraduate university students, physical activity was not significantly related to the incidence or duration of the common cold.
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