Physical fitness characteristics of a front-line firefighter population

Firefighters require a high level of physical fitness in order to meet the demands of their profession. While physical performance testing is required to join the department, firefighters are not subject to further formal exercise or performance testing throughout the duration of their careers. The purpose of the present study was to gather information regarding the physical fitness of front-line Canadian firefighters, to determine whether a testing battery predictive of both performance and future injury risk is viable, and to make recommendations regarding the format of fitness testing and training programs for front-line firefighters. Front-line, career firefighters were tested on a variety of physical fitness measures related to body composition, strength, power, and endurance over three testing sessions. Large ranges of data were found for many of the measures taken and tests performed. Body fat percentage had the most significant correlations with other performance tests while performance in the pushup test and vertical jump correlated strongly with many of the more sophisticated fitness tests. Some firefighters may not possess adequate fitness levels to optimally perform their job responsibilities. Simple field tests may form the basis of predictive testing batteries for both fitness and future injury risk, though further research is needed

Physioacoustic Therapy: Placebo Effect on Recovery From Exercise-Induced Muscle Damage

We evaluated claims that physioacoustic therapy can enhance muscle healing following damaging exercise. Untrained subjects were randomly assigned to control (C), placebo (P) or treatment (T) groups. All groups performed 70 eccentric triceps contractions followed by; no treatment (C), sham physioacoustic treatment (P), or actual physioacoustic therapy (T) on days 1–4 post-exercise. Muscle soreness and isometric and concentric triceps peak torque were determined preexercise and on days 1–4 and 7 post-exercise. The T group received physioacoustic therapy for 30 min/day on the treatment days. The P group believed they received physioacoustic therapy, although the chairs were turned off. Peak torques were depressed (P \u3c 0.05) on days 1–3 in all groups and returned to pre-exercise values by days 4–7 in both P and T groups. C group peak torques remained depressed (P \u3c 0.05) through day 7. Soreness was elevated (P \u3c 0.05) in all groups on days 1–2 post-exercise. P and T groups reported no soreness by day 3 while the C group remained sore (P \u3c 0.05) through days 3–4. The T group recovered soreness and force faster than C but at a similar rate to the P group. The effectiveness of physioacoustic therapy in enhancing post-exercise muscle healing may be attributable to a placebo effect

Physioacoustic therapy: placebo effect on recovery from exercise-induced muscle damage

We evaluated claims that physioacoustic therapy can enhance muscle healing following damaging exercise. Untrained subjects were randomly assigned to control (C), placebo (P) or treatment (T) groups. All groups performed 70 eccentric triceps contractions followed by; no treatment (C), sham physioacoustic treatment (P), or actual physioacoustic therapy (T) on days 1–4 post-exercise. Muscle soreness and isometric and concentric triceps peak torque were determined pre-exerciseand on days 1–4 and 7 post-exercise. The T group received physioacoustic therapy for 30 min/day on the treatment days. The P group believed they received physioacoustic therapy, although the chairs were turned off. Peak torques were depressed (P < 0.05) on days 1–3 in all groups and returned to pre-exercise values by days 4–7 in both P and T groups. C group peak torques remained depressed (P < 0.05) through day 7. Soreness was elevated (P < 0.05) in all groups on days 1–2 post-exercise. P and T groups reported no soreness by day 3 while the C group remained sore (P < 0.05) through days 3–4. The T group recovered soreness and force faster than C but at a similar rate to the P group. The effectiveness of physioacoustic therapy in enhancing post-exercise muscle healing may be attributable to a placebo effect

Effects of ovariectomy and estrogen on ischemia-reperfusion injury in hindlimbs of female rats

The effects of estrogen and ovariectomy on indexes of muscle damage after 2 h of complete hindlimb ischemia and 2 h of reperfusion were investigated in female Sprague-Dawley rats. The rats were assigned to one of three experimental groups: ovariectomized with a 17-estradiol pellet implant (OE), ovariectomized with a placebo pellet implant (OP), or control with intact ovaries (R). It was hypothesized that following ischemia-reperfusion (I/R), muscle damage indexes [serum creatine kinase (CK) activity, calpain-like activity, inflammatory cell infiltration, and markers of lipid peroxidation (thiobarbituric-reactive substances)] would be lower in the OE and R rats compared with the OP rats due to the protective effects of estrogen. Serum CK activity following I/R was greater (P &lt; 0.01) in the R rats vs. OP rats and similar in the OP and OE rats. Calpain-like activity was greatest in the R rats (P &lt; 0.01) and similar in the OP and OE rats. Neutrophil infiltration was assessed using the myeloperoxidase (MPO) assay and immunohistochemical staining for CD43-positive (CD43+) cells. MPO activity was lower (P &lt; 0.05) in the OE rats compared with any other group and similar in the OP and R rats. The number of CD43+ cells was greater (P &lt; 0.01) in the OP rats compared with the OE and R rats and similar in the OE and R rats. The OE rats had lower (P &lt; 0.05) thiobarbituric-reactive substance content following I/R compared with the R and OP rats. Indexes of muscle damage were consistently attenuated in the OE rats but not in the R rats. A 10-fold difference in serum estrogen content may mediate this. Surprisingly, serum CK activity and muscle calpain-like activity were lower (P &lt; 0.05) in the OP rats compared with the R rats. Increases in serum insulin-like growth factor-1 content (P &lt; 0.05) due to ovariectomy were hypothesized to account for this finding. Thus both ovariectomy and estrogen supplementation have differential effects on indexes of I/R muscle damage. <br /

THE EFFECT OF TAPERING PERIOD ON PLASMA PRO-INFLAMMATORY CYTOKINE LEVELS AND PERFORMANCE IN ELITE MALE CYCLISTS

The aim of this study was to investigate the effect of two different tapering period lengths on the concentration of plasma interleukin- 6 (IL-6), interleukin (IL-1β) and tumor necrosis factor-? (TNF-α) and performance in elite male cyclists. To this end, after completing 8 weeks progressive endurance exercise, twenty four high-level endurance cyclists were randomly assigned to one of two groups: a control group of cyclists (n = 12) continued performing progressive weekly training volume for 3 weeks while a taper group of cyclists (n = 12) proceeded with a 50% reduction in weekly training volume relative to the control group. A simulated 40 min time trial (40TT) performance ride was used as the criterion index of performance before and after the tapering period to evaluate the physiological and performance effects of each protocol. Blood samples were collected immediately post-40TT from all participants at the beginning of week 1, and the end of weeks 4, 8, 9 and 11. IL-1β, IL-6 and TNFα were assayed using a standard commercial ELISA kits (Quantikine; R & D Systems, Minneapolis, MN). The mean time to complete the 40TT in the taper group decreased significantly (p < 0.01) after both 1 and 3 weeks with reduced training volume relative to the control group. There were significant reductions in (p < 0.001) IL-1β, IL-6 and TNFα concentrations in the taper group relative to the control group at the end of the 3 week tapering period, but not at the end of the 1 week tapering period. These results demonstrate that both a 1 and a 3 week taper period will result in improved physical performance in trained cyclists but only a 3 week taper period will result in attenuation of post-exercise pro- inflammatory cytokines when compared to those continuing a more intense training regime