Featured
Palm Cooling
Novak Djokovic and the changeover
How the world number one came to hold a KYLA prototype at every changeover of the Australian Open, and has trained and played with it sin...
JOURNAL
THE THINKING BEHIND THE TOOL.
Notes on heat, recovery, palm cooling, and the moment between efforts. Long-form context for what we are building and the science behind it.
Heat & Performance
Chess, cognition, and temperature
Working memory and decision making degrade above 25°C. From Fischer-Spassky 1972 to recent research, why cognition has a thermal ceiling.
Palm Cooling
Cooling vest or palm cooling: which does what
Cooling vests cool the torso before and during an effort in heat. Palm cooling removes heat between efforts through the hand. They are no...
Palm Cooling
Why two hands is 1.6, not 2
Both palms draw on the same central blood supply, so a second cooled hand takes you to about 1.6 times one hand, not two. Why that is, an...
Palm Cooling
Passive or battery-powered palm cooling: what electricity buys you, and what it does not
Battery-powered palm coolers hold a set temperature for an hour or two. Passive ones carry a fixed amount of cold. Which moves more heat ...
Heat & Performance
The bedroom is the most underrated performance variable
Optimal sleep happens between 16 and 19°C. Why core temperature must drop to access deep sleep, and why most bedrooms work against recovery.
Heat & Performance
F1 and the one-degree window
F1 teams treat one degree of tire and brake temperature as decisive. What motorsport's obsession with heat teaches the rest of athletic c...
Palm Cooling
Is Colder Better for Palm Cooling?
Colder is not better through the palms. Two things decide how much heat leaves: the temperature, and how much heat the surface can keep t...
Heat & Performance
Why Do My Hands Get Hot When I Train?
Your hands get hot when you train because the palms are one of the body's main heat release valves. What that signal means, and what it c...
Methods Compared
Ice Bath vs Palm Cooling: What Each One Does
One is whole-body cold after training. The other moves heat during it. What each method does, when to use which, and what the evidence su...
Heat & Performance
Brown fat and the cost of being warm
60 to 70 percent of basal metabolic rate maintains body temperature. Brown adipose tissue, the metabolic cost of staying warm, and athlet...
Pre-Cooling Before a Race: What the Science Says
Pre-cooling before a race means lowering your body's heat before the effort begins, so you start with more headroom before heat limits yo...