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 .
Does aerobic exercise improve or impair cardiorespiratory fitness and health among cleaners? A cluster randomized controlled trial.
OBJECTIVE It is unknown if aerobic exercise overloads or improves the cardiovascular system among workers with high occupational physical activity . This was investigated in a worksite r and omized controlled trial ( RCT ) of aerobic exercise among cleaners . METHODS We r and omized 116 cleaners between 18 - 65 years . The aerobic exercise group ( N=57 ) performed worksite aerobic exercise ( 30 minutes twice a week ) and the reference group ( N=59 ) received lectures .  Cardiorespiratory fitness , blood pressure ( BP ) and diurnal heart rate ( HR ) for measuring aerobic workload [ % HR reserve ( % HRR ) ] were collected at baseline and after four months . A repeated measure 2 × 2 multi-adjusted mixed-model design was applied to compare the between-group differences in an intention-to-treat analysis . RESULTS Between-group differences ( P<0.01 ) were found : cardiorespiratory fitness 2.2 [ st and ard error ( SE ) 0.8 ] ml O 2 × min -1 × kg -1 [ 95 % confidence interval ( 95 % CI ) 0.6 - 3.8 ] , aerobic workload - 3.5 ( SE 1.2 ) % HRR ( 95 % CI - 5.9- -1.0 ) , resting HR -3.8 ( SE 1.2 ) bpm ( 95 % CI -6.1- - 1.4 ) , sleeping HR -3.8 ( SE 1.1 ) bpm ( 95 % CI - 5.9- - 1.7 ) , and systolic BP 3.6 ( SE 1.3 ) mmHg ( 95 % CI 1.1 - 6.0 ) . CONCLUSIONS Worksite aerobic exercise seems to improve cardiorespiratory fitness , aerobic workload , and resting and sleeping HR , but increase systolic BP among cleaners . Beneficial physiological cardiovascular effects are seen from aerobic exercise , but also a harmful effect is evident . Therefore , recommendations should take into consideration the potential cardiovascular overload from additional aerobic exercise on workers with high levels of occupational physical activity
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 .