Conclusions Workplace-based physical activity interventions consisting of at least moderate-intensity activity improve cardiorespiratory fitness .
At the present time , we surmise that no single group of employees ( e.g. older employees or less fit individuals ) can be definitively identified as st and ing to benefit more from workplace physical activity interventions than others .
This demonstrates the potential utility of workplace physical activity interventions for improving cardiorespiratory fitness in a broad range of healthy employees .
Background Cardiorespiratory fitness is a strong predictor of all-cause mortality .
Physical activity of at least moderate intensity can improve cardiorespiratory fitness .
Workplaces may provide a relatively controlled setting in which to improve cardiorespiratory fitness through physical activity .
Limited work has been conducted to quantify the impact of delivering physical activity in the workplace on cardiorespiratory fitness .
Objective The objective of this systematic review was to quantify the effects of workplace physical activity interventions on peak oxygen consumption ( VO2peak ) and explore study and participant characteristics as putative moderators .
Evaluating Intervention Fidelity: An Example from a High-Intensity Interval Training Study
Aim Intervention fidelity refers to the degree to which an experimental manipulation has been implemented as intended , but simple , robust methods for quantifying fidelity have not been well documented . Therefore , we aim to illustrate a rigorous quantitative evaluation of intervention fidelity , using data collected during a high-intensity interval training intervention . Design Single-group measurement study . Methods Seventeen adolescents ( mean age ± st and ard deviation [ SD ] 14.0 ± 0.3 years ) attended a 10-week high-intensity interval training intervention , comprising two exercise sessions per week . Sessions consisted of 4 - 7 45-s maximal effort repetitions , interspersed with 90-s rest . We collected  heart rate data at 5-s intervals and recorded the peak heart rate for each repetition . The high-intensity exercise criterion was ≥90 % of individual maximal heart rate . For each participant , we calculated the proportion of total exercise repetitions exceeding this threshold . A linear mixed model was applied to properly separate the variability in peak heart rate between- and within-subjects . Results are presented both as intention to treat ( including missed sessions ) and per protocol ( only participants with 100 % attendance ; n=8 ) . Results For intention to treat , the median ( interquartile range ) proportion of repetitions meeting the high-intensity criterion was 58 % ( 42 % to 68 % ) . The mean peak heart rate was 85 % of maximal , with a between-subject SD of 7.8 ( 95 % confidence interval 5.4 to 11.3 ) percentage points and a within-subject SD of 15.1 ( 14.6 to 15.6 ) percentage points . For the per protocol analysis , the median proportion of high-intensity repetitions was 68 % ( 47 % to 86 % ) . The mean peak heart rate was 91 % of maximal , with between- and within-subject SDs of 3.1 ( -1.3 to 4.6 ) and 3.4 ( 3.2 to 3.6 ) percentage points , respectively . Conclusions Synthesis ing information on exercise session attendance and compliance ( exercise intensity ) quantifies the intervention dose and informs evaluations of treatment fidelity
Conclusions Workplace-based physical activity interventions consisting of at least moderate-intensity activity improve cardiorespiratory fitness .
At the present time , we surmise that no single group of employees ( e.g. older employees or less fit individuals ) can be definitively identified as st and ing to benefit more from workplace physical activity interventions than others .
This demonstrates the potential utility of workplace physical activity interventions for improving cardiorespiratory fitness in a broad range of healthy employees .
Background Cardiorespiratory fitness is a strong predictor of all-cause mortality .
Physical activity of at least moderate intensity can improve cardiorespiratory fitness .
Workplaces may provide a relatively controlled setting in which to improve cardiorespiratory fitness through physical activity .
Limited work has been conducted to quantify the impact of delivering physical activity in the workplace on cardiorespiratory fitness .
Objective The objective of this systematic review was to quantify the effects of workplace physical activity interventions on peak oxygen consumption ( VO2peak ) and explore study and participant characteristics as putative moderators .