Jonathan Barber

Special Issue Published as part of Environmental Science & Technology special issue “Ocean Health”. 1. Introduction Click to copy section linkSection link copied! Trace elements, particularly heavy metals like mercury (Hg), pose a significant threat to marine ecosystems. (1) Apex predators such as marine mammals are particularly susceptible to elements that biomagnify and bioaccumulate because they are long-lived and feed at a high trophic level.

Contributed by Jonathan Barber Jonathan is a former professional triathlete and cyclist. He studied exercise physiology at Stanford University School of Medicine and is a USA-certified coach in swimming, cycling, and triathlon. The views expressed in this article are his own. For expert article submissions, email: . I know I do. But we may have to do a bit of suffering first. Why is it that some athletes are just so much faster than others?

Can you train for a peak cycling performance without the use of a power meter? Yes – you CAN train for both cycling (and running) effectively without access to your power output data. While it is best to measure both input (heart rate) and output (speed and power) data simultaneously – you CAN develop a very effective training regimen by just measuring heart rate and speed. What Do you Need? You need to have access to a heart rate monitor, and a GPS device or cycle computer.