Brooke E. Starkoff

Crossfit-based high-intensity power training improves maximal aerobic fitness and body composition.

The purpose of this study was to examine the effects of a crossfit-based high-intensity power training (HIPT) program on aerobic fitness and body composition. Healthy subjects of both genders (23 men, 20 women) spanning all levels of aerobic fitness and body composition completed 10 weeks of HIPT consisting of lifts such as the squat, deadlift, clean, snatch, and overhead press performed as quickly as possible. Additionally, this crossfit-based HIPT program included skill work for the improvement of traditional Olympic lifts and selected gymnastic exercises. Body fat percentage was estimated using whole-body plethysmography, and maximal aerobic capacity (VO2max) was measured by analyzing expired gasses during a Bruce protocol maximal graded treadmill test. These variables were measured again after 10 weeks of training and compared for significant changes using a paired t-test. Results showed significant (p < 0.05) improvements of VO2max in men (43.10 ± 1.40 to 48.96 ± 1.42 ml · kg · min) and women (35.98 ± 1.60 to 40.22 ± 1.62 ml · kg · min) and decreased body fat percentage in men (22.2 ± 1.3 to 18.0 ± 1.3) and women (26.6 ± 2.0 to 23.2 ± 2.0). These improvements were significant across all levels of initial fitness. Significant correlations between absolute oxygen consumption and oxygen consumption relative to body weight was found in both men (r = 0.83, p < 0.001) and women (r = 0.94, p < 0.001), indicating that HIPT improved VO2max scaled to body weight independent of changes to body composition. Our data show that HIPT significantly improves VO2max and body composition in subjects of both genders across all levels of fitness.

Physical activity patterns of adults with visual impairments

This study examined physical activity (PA) patterns in adults with visual impairments (VI) using the International Physical Activity Questionnaire–Short Form, assessing moderate physical activity (MPA), vigorous physical activity (VPA), and moderate-to-vigorous physical activity (MVPA). A total of 115 individuals (age: 36.1 ± 13.9 years, body mass index [BMI]: 28 ± 6.9 kg/m2) with VI completed the study. One-way analyses of variance (ANOVAs) were performed on VI (B1, B2, B3, and B4), collapsed VI (blind [B1] vs VI [B2–B4]), gender, and BMI across PA. A 2 × 4 factor ANOVA examined the impact of gender and BMI on PA. B2 walked more than B1 (p = .021) and walk time was less in B1 (p = .021) than VI. Males accumulated more MPA (p = .002) and MVPA (p = .008), and a greater percentage of males acquired recommended PA (p = .008). Overweight participants acquired more VPA than normal-weight participants (p = .020). A main effect for gender (p = .000) and interaction between gender and BMI (p = .049) were identified with MPA. Differences in PA based on VI may be a result of barriers specific to B1, suggesting the need for education in this population.